BD Series Hydrostatic Transmissions Technical...

Technical Information

BD SeriesHydrostatic Transmissions

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Revision history Table of revisions

Date Changed Rev

May 2017 Fixed typo 0102

June 2016 Convertd to DITA-CMS 0101

Mar 2010 Correction - Drawing AC

Jan 2009 Correction - Text AB

Jan 2006 First edition AA

Technical InformationBD Series Hydrostatic Transmissions

2 | © Danfoss | May 2017 520L0935 | BC00000025en-US0102

General DescriptionBD Series Family................................................................................................................................................................................5Features and Benefits......................................................................................................................................................................5Design...................................................................................................................................................................................................6BDU-06/10S........................................................................................................................................................................................ 8

Pictorial Diagram.........................................................................................................................................................................8System Schematic.......................................................................................................................................................................8

BDU-10L/21L/21H.............................................................................................................................................................................9Pictorial Diagram.........................................................................................................................................................................9System Schematic: BDU-21L................................................................................................................................................... 9System Schematic: BDU-21H................................................................................................................................................10

BDP-10L............................................................................................................................................................................................. 10System Schematic.................................................................................................................................................................... 10

Technical SpecificationsFeatures and Options................................................................................................................................................................... 11Operating Parameters.................................................................................................................................................................. 11Fluid Specifications....................................................................................................................................................................... 12Efficiency........................................................................................................................................................................................... 13

BDU-06S....................................................................................................................................................................................... 13BDU-10S....................................................................................................................................................................................... 13BDU-10L....................................................................................................................................................................................... 13BDU-21L/21H..............................................................................................................................................................................14BDP-10L........................................................................................................................................................................................14

Operating ParametersOverview........................................................................................................................................................................................... 15Input Speed......................................................................................................................................................................................15System Pressure..............................................................................................................................................................................15Charge Pressure..............................................................................................................................................................................15Charge Inlet Pressure....................................................................................................................................................................15Case Pressure...................................................................................................................................................................................16Hydraulic Fluids.............................................................................................................................................................................. 16Temperature and Viscosity.........................................................................................................................................................16

System Design ParametersFluid and Filtration........................................................................................................................................................................ 17Reservoir............................................................................................................................................................................................17Control Shaft Force........................................................................................................................................................................17Independent Braking System.................................................................................................................................................... 17

Features and OptionsShaft Load.........................................................................................................................................................................................18Shaft Options...................................................................................................................................................................................18Shaft Options : BDU-06S/10S/10L............................................................................................................................................ 19Shaft Options : BDU-21L/21H.................................................................................................................................................... 20Bypass Valve.....................................................................................................................................................................................21High Pressure Relief Valve (hprv) and Charge Check (Overpressure Protection)................................................... 21Charge Check Valve with Orifice.............................................................................................................................................. 22Charge Check with Orifice.......................................................................................................................................................... 23Optional Integrated Reservoir...................................................................................................................................................24Filter.................................................................................................................................................................................................... 24Fan.......................................................................................................................................................................................................25

Component SelectionMaximum System Pressure........................................................................................................................................................ 26Input Power......................................................................................................................................................................................27Unit Life..............................................................................................................................................................................................28

Model CodeBDU : Model Code (A - B - C - D - E).......................................................................................................................................... 29BDU : Model Code (F - G)............................................................................................................................................................. 30


Contents

© Danfoss | May 2017 520L0935 | BC00000025en-US0102 | 3

BDU : Model Code (H - J - K)........................................................................................................................................................31BDP : Model Code ......................................................................................................................................................................... 32

Recommended Installation and MaintenanceHousing Installation...................................................................................................................................................................... 34Shaft Installation.............................................................................................................................................................................34Start Up Procedure........................................................................................................................................................................ 34Operation..........................................................................................................................................................................................34Maintenance.................................................................................................................................................................................... 34

Installation DrawingsBDU-06S : Ports and Dimensions..............................................................................................................................................35BDU-06S : Control Arm Location.............................................................................................................................................. 36BDU-06S : Motor Shaft..................................................................................................................................................................36BDU-10S/10L : Ports and Dimensions.....................................................................................................................................37BDU-10S/10L : Control Arm Location..................................................................................................................................... 38BDU-10S/10L : Motor Shaft.........................................................................................................................................................39BDU-10S : Shaft Configuration.................................................................................................................................................. 40BDU-10L : Shaft Configuration and Charge Pumps Displacement.............................................................................. 41BDU-21L/21H : Ports and Dimensions.................................................................................................................................... 42BDU-21L/21H : Control Arm Location.....................................................................................................................................43BDU-21L/21H : Motor Shaft........................................................................................................................................................ 44BDU-21L/21H : Shaft Configuration and Charge Pump Displacement...................................................................... 45BDP-10L : Ports and Dimensions.............................................................................................................................................. 47Optional Fan.................................................................................................................................................................................... 48


Contents


BD Series Family

The BD hydrostatic transmission can be applied for the transfer and control of power. It provides aninfinitely variable speed range between zero and maximum in both forward and reverse modes ofoperation.

The BDU transmission is a “ Z” style transmission with a variable displacement pump and a fixeddisplacement motor. The variable displacement pump features a cradle swashplate with a directproportional displacement control. Reversing the direction of tilt of the swashplate reverses the flow ofoil from the pump and thus reverses the direction of the motor output rotation. The fixed displacementmotor uses a fixed swashplate. The pump and motor are of the axial piston design and utilizesphericalnosed pistons which are held against a thrust bearing by internal compression springs. The fluidsupply for the BDU-10L/21L/21H transmission is contained in an external reservoir and passes throughan external filter prior to entering the transmission and feeding the fixed displacement gerotor chargepump. Excess fluid in the charge circuit is discharged over the charge relief valve back to the chargepump inlet. Constant flow across a small fixed orifice connecting the charge circuit to the transmissionhousing supplements the cooling flow.

The BDU-06S/10S transmission has a self-contained fluid supply and an integral filter. The fluid is forcedthrough the filter by positive “head” on the fluid in the housing reservoir with an assist by the negativepressure created in the pump pistons as they create a vacuum. Charge check valves in the center sectionare used to control the makeup flow of fluid to the low pressure side of the loop. A spool type bypassvalve is utilized in the transmission to permit moving the vehicle over short distances at low speedswithout starting the engine.

The BDP-10L is a variable displacement pump to utilize the pump kit of the BDU-10L transmission anddesigned for vehicle application which is for propel or for auxiliary functions where the system pressurerequirements and design life can be met within pump rating.

Features and Benefits

• A complete transmission family to meet the needs of small vehicle application.

• 3 Transmission Frame Sizes: 6, 10, 21

• PTO Capability on “Z” Style Transmission

• Variable Pump Version of 10 Frame Size Available (10cm3)

• Cost Effective, Compact, Lightweight Design

• Low Noise

• High Efficiency

• Worldwide Sales and Service


General Description


Design

BD Series Cross-Section (BDU-10S)

1

4

2

P400202

14

15

16

3

11

12

135

6

7

8 9

10

1. Tank 7. Spool type bypass valve 13. Shaft seal

2. Built-in filter 8. Cylinder block 14. Input shaft

3. Spring 9. Piston 15. Cooling fan

4. Center section 10. Thrust bearing 16. Cradle swash plate

5. Output shaft 11. Housing

6. Spring 12. Ball bearing


General Description


P400203

18

22

3

4

5

11

10

9

8

7

6

20

19

1

17

16

15

14

1312

1. Suction Circuit 8. Charge Relief 15. Ball Bearing

2. Working Loop 9. Charge Circuit 16. Shaft Seal

3. Charge Check Valve 10. Output Shaft 17. Input Shaft

4. Spool Type Bypass Valve 11. Center Section 18. Cradle Swash Plate

5. Center Section 12. Cylinder Block 19. Piston

6. Suction Port 13. Thrust Bearing 20. Spring

7. Charge Pump 14. Housing


General Description


BDU-06/10S

Pictorial Diagram

BDU-06S, BDU-10S

BypassValve

CylinderBlockAssembly

InputShaft

VariableSwashplate Variable

DisplacementPump

BDUHousing

Reservor

B uilt-InFilter(BDU-10S)

Check Valve

Check ValveCylinder BlockAssembly

OutputShaft

DisplacementMotor

P400204

FixedSwashplate

Fixed

Working Loop(high pressure)

Working Loop(low pressure)

Suction Line Case Drain Fluid

System Schematic

Control Shaft “b”

Control Shaft “a”

Hydraulic Circuit

ø0.7 ø0.8

P400205

Ø0.7 Ø0.8

1

1

2

2

3

3

1. Ball Check Valve, Option Code. : BB2. Check Valve with Ø0.7 Orifice, Option Code : 073. Check Valve with Ø0.8 Orifice, Option Code : 08


General Description


BDU-10L/21L/21H

Pictorial Diagram

BDU-10L, BDU-21L, BDU-21H, BDP-10L (part of pump)

BypassValve

CylinderBlockAssembly

InputShaft

VariableSwashplate

VariableDisplacementPump

Reservor

Filter

Check Valve

Check Valve Cylinder BlockAssembly Output

Shaft

FixedSwashplateCooling

Orifice

ChargePump

ChargeReliefValve

DisplacementMotor

Fixed

P400206

Working Loop(high pressure)

Working Loop(low pressure)

Suction Line Case Drain Fluid

System Schematic: BDU-21L



Hydraulic CircuitSuction Port Drain Port

Ø1.0 Ø1.2

Ø1.0

Ø0.8

Ø1.2

BDU-21L

P400207

1

1

2

2

3

3

1. Ball Check Valve, Option Code. : BB2. Check Valve with Ø1.0 Orifice, Option Code : 103. Check Valve with Ø1.2 Orifice, Option Code : 12


General Description


System Schematic: BDU-21H

20.6MPa 17.2MPa 13.7MPa 20.6MPa 20.6MPa

20.6MPa 17.2MPa 13.7MPa 20.6MPa 20.6MPa



Hydraulic CircuitSuction Port Drain Port

Ø0.8

ø0.85

ø0.85ø0.7×2

BDU-21H

ø0.7×2

P400208

1 2 3 4 5

1 2 3 4 5

1. Check Valve with Relief Valve, Option Code. : R02. Check Valve with Relief Valve, Option Code. : R13. Check Valve with Relief Valve, Option Code. : R24. Check Valve with Relief Valve and Ø0.7 Twin Orifice, Option Code. : RA5. Check Valve with Relief Valve and Ø0.85 Orifice, Option Code. : RB

BDP-10L

System Schematic

BDP-10L

P400209


General Description


Features and Options

Features UnitProduct Type & Frame

BDU-06S BDU-10S BDU-10L BDU-21L BDU-21H BDP-10L

Pump

Displacement cm3 [in3]6

[0.37]10

[0.61]10

[0.61]21

[1.28]21

[1.28]10

[0.61]

Swashplate Angle degree 15 15 15 15 15 15

Control Shaft degree 15 21 21 22 22 21

MotorDisplacement cm3 [in3]

6[0.37]

10[0.61]

10[0.61]

21[1.28]

21[1.28] -

Swashplate Angle degree 15 15 15 15 15 -

Charge Pump Displacement cm3 [in3] NA NA1.9

[0.12]2.1

[0.13]3.0

[0.18]1.9

[0.12]

Output SpeedRated

min-13000 3000 3600 3600 3600 3600

Maximum(intermittent) 3200 3200 3800 3800 3800 3800

Maximum Output Torque (Theoretical) Nm [lbf•in]9.8[87]

23.4[208]

23.4[208]

49.2[436]

72.1[639] -

Input Power (Maximum) kW [ps]1.1

[1.5]2.2

[3.0]3.7

[5.0]7.4

[10.0]11.0

[15.0]3.7

[5.0]

Weight kgf [lbs]4

[9]6.3[14]

6.5[14]

10[22]

10[22]

4.6[10]

Control Torque Required to Stroke Pump(Maximum) Nm [lbf•in]

8.8[78]

19.6[174]

19.6[174]

22.5[200]

24.5[217]

19.6[174]

Mounting See Installation Drawings

Rotation Clockwise or Counterclockwise

Suction/Oil Tank Port (SAE O-ring Boss) 7/8-14 UNF 7/16-20 UNF 9/16-18 UNF 7/16-20 UNF

Other ports See Installation Drawings

Shaft See Installation Drawings

Bypass Valve OP STD STD STD STD STD

Neutral Valve/Orifice NA/NA NA/OP NA/OP OP/OP OP/OP NA/OP

High Pressure Relief Valve NA NA NA NA STD NA

Filtration W/O built-in External External (Option, Integrated) External

Reservoir Integrated Integrated External External External

Space for the oil in the housing cm3 450 550 550 700 700 250

SAE J1926-1 / ISO 11926-1

Operating Parameters

Parameter UnitProduct Type & Frame


Input Speed

Minimum

min-1

1000 600

Rated 3000 3600

Maximum 3200 3800

System Pressure


Technical Specifications


Parameter UnitProduct Type & Frame


Ratedbar[psi]

105[1530]

150[2185]

210[3059]

150[2185]

Maximum105

[1530]175

[2549]210

[3059]245

[3569]175

[2549]

Charge Pressurebar[psi] NA 3 [44] - 5 [73]

Charge Inlet Pressurebar[psi] NA 0.8 [12] abs

Case Pressure

Rated bar[psi]

0.3 [4]

Maximum (Cold Start) 0.7 [10]

Fluid Specifications

Features Units BD Series

Viscosity

Minimummm2/sec.

[ SUS]

7 [49]

Continuous 12-60 [66-280]

Maximum 1600 [7500]

Temperature

Minimum

°C [°F]

-10 [14]

Maximum Continuous 82 [180]

Maximum 104 [219]




Efficiency

Input speed: 3000 min-1, Oil temperature: 50 °C, Full Displacement

BDU-06S

Efficiency (ηv:Volumetric, ηm:Mechanial, ηt:Overall)

100

Effic

ien

cy

%

90

80

70

60

50

40

30

20

10

03 5 7

Theoretical Output Torpue Nm

40%

40%

50%

50%

55%

55%

60%

60%

65%

65%

70%

70%

45%

45%

10

5

0 1000 2000 3000

Ou

tpu

t T

orq

ue

Nm

Output Speed min-1P400210

BDU-10S


100

90

80

70

60

50

40

30

20

10

05 9 11 13 17

Effic

ien

cy

%


40%45%

50%55%

60%65%

70%73%

73%

70%

65%

60%55%

50%45%40%

20

10

0 1000 2000 3000

Ou

tpu

t T

orq

ue

Nm


BDU-10L


1009080

70

60

5040

30

20

10

05 5 7 9 11 13 15 16 18 20 22

Effic

ien

cy

%


40%45%

50%55%

60%65%

70%73%

73%

70%

65%

60%55%

50%45%40%

20

10

0 1000 2000 3000

P400212

Ou

tpu

t T

orq

ue

Nm

Output Speed min-1




BDU-21L/21H


10090

8070

605040

3020

100

11 23 34 46 57 65

Effic

ien

cy

%


40%45%

50%55%

60%65%

70%75%

70%

75%

65%

60%55%

50%45%40%

50

40

30

20

10

0 1000 2000 3000

Ou

tpu

t T

orq

ue

Nm


BDP-10L

35.0

30.0

25.0

20.0

15.0

10.0

5.0

0.0

Ou

tpu

t flo

w

Lite

r / m

in

at no road

at 105 bar

70 bar

105 bar

1500 1000500 2000 2500 3000

Input Speed min-1

1500 1000500 2000 2500 3000

Input Speed min-1

100

9080706050403020

100

Effic

ien

cy

%

P400214

Overall EfficiecyOutput flow - Input Speed




Overview

Maintain operating parameters within prescribed limits during all operating conditions. This sectiondefines operating limits given in the table Operating Parameters.

Input Speed

Minimum speed is the lowest input speed recommended during engine idle condition. Operating belowminimum speed limits pump’s ability to maintain adequate flow for lubrication and power transmission.

Rated speed is the highest input speed recommended at full power condition. Operating at or belowthis speed should yield satisfactory product life.

Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces productlife and can cause loss of hydrostatic power and braking capacity. Never exceed the maximum speedlimit under any operating conditions.

Operating conditions between rated speed and maximum speed should be restricted to less than fullpower and to limited periods of time. For most drive systems, maximum unit speed occurs duringdownhill braking or negative power conditions.

W Warning

Unintended vehicle or machine movement hazard.Exceeding maximum speed may cause a loss of hydrostatic drive line power and braking capacity. Youmust provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold thevehicle or machine in the event of hydrostatic drive power loss.

System Pressure

System pressure is the differential pressure between system ports A & B. It is the dominant operatingvariable affecting hydraulic unit life. High system pressure, which results from high load, reducesexpected life. Hydraulic unit life depends on speed and normal operating—or weighted average—pressure that you can only determine from a duty cycle analysis.

Maximum Working Pressure is the highest recommended Application pressure. Maximum workingpressure is not intended to be a continuous pressure. Propel systems with Application pressures at, orbelow, this pressure should yield satisfactory unit life given proper component sizing.

Maximum pressure (peak) is the highest intermittent pressure allowed under any circumstances.Applications with applied pressures between rated and maximum require factory approval withcomplete application, duty cycle, and life expectancy analysis.

All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low looppressure from gauge readings to compute the differential.

Charge Pressure

The charge pressure setting listed in the technical specifications is based on the charge flow across thecharge pressure relief valve at fluid temperature at 50˚C [120˚F].

Charge Inlet Pressure

Charge pump inlet conditions must be controlled in order to achieve expected life and performance. Acontinuous inlet vacuum of no less than 0.8 abs bar is recommended. Normal vacuums less than 0.7 absbar would indicate inadequate inlet design or stricted filter.




Case Pressure

Under normal operating conditions, the maximum continuous case pressure must not exceed 0.3 bar(4PSI). Maximum allowable intermittent case pressure during cold start must not exceed 0.7 bar (10PSI).

C Caution

Possible component damage or leakageOperation with case pressure in excess of stated limits may damage seals, gaskets, and/or housings,causing external leakage. This condition may also affect performance since charge and system pressureare referenced to case pressure.

Hydraulic Fluids

Ratings and performance data are based on operating with hydraulic fluids containing oxidation, rustand foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear,erosion, and corrosion of motor components.

The following hydraulic fluids are suitable:

Hydraulic fluid type Standard, name/type Note

Hydraulic Oil ISO 11 158 – HM seal compatibility and vane pump wear resistanceper DIN 51 524-2 must be met

ISO 11 158 - HV seal compatibility and vane pump wear resistanceper DIN 51 524-3 must be met

DIN 51 524-2 - HLP

DIN 51 524-3 - HVLP

Engine oil API Classification SL, SJ for gasoline engines

CI-4, CH-4, CG-4, CF-4 and CF for diesel engines

Temperature and Viscosity

Temperature and viscosity requirements must be concurrently satisfied. The data shown in the table FluidSpecifications on page 12, assume petroleum-based fluids are used.

The high temperature limits apply at the hottest point in the transmission, which is normally the motorcase drain. The system should generally be run at or below the rated temperature. The maximumtemperature is based on material properties and should never be exceeded.

Cold oil will generally not affect the durability of the transmission components, but it may affect theability of oil to flow and transmit power; therefore temperatures should remain 16 °C [30 °F] above thepour point of the hydraulic fluid. The minimum temperature relates to the physical properties ofcomponent materials.

For maximum unit efficiency and bearing life the fluid viscosity should remain in the recommendedoperating range. The minimum viscosity should be encountered only during brief occasions ofmaximum ambient temperature and severe duty cycle operation. The maximum viscosity should beencountered only at cold start.

Heat exchangers should be sized to keep the fluid within these limits. Testing to verify that thesetemperature limits are not exceeded is recommended.




Fluid and Filtration

To prevent premature wear, it is imperative that only clean fluid enters the hydrostatic transmissioncircuit. Therefore an inlet filter better than β20=1.4 is required in the charge pump inlet line. This filtershould not have a bypass and should be changed regularly to ensure system reliability. The BD serieshydrostatic transmission requires system filtration capable of maintaining fluid cleanliness at ISO4406-1999 class 22/18/15 or better.

Reservoir

The BDU-06S and BDU-10S are designed with optional integrated reservoir. A reservoir for BDU-10L andBDP-10L larger than the 2 liter tank size is recommended. A reservoir for BDU-21L/H larger than the 5 litertank size is recommended. The hoses or piping size is recommended to be larger than 3/8 inch normaltube OD.

Control Shaft Force

The BDU transmission is designed with direct displacement control (DDC). DDC can be located at eitherside of the housing. It provides a simple, positive method of control. Movement of the control shaftcauses a proportional swashplate movement, thus varying the pump’s displacement from fulldisplacement in one direction to full displacement in the opposite direction.

The approximate maximum control torque necessary to rotate the control shaft is shown in the table oftechnical specifications. A stopper to prevent over-stroke is required at the end of maximum angle ofcontrol shaft. The control shaft force should be kept at or below the force in the table below.

Features UnitProduct type & Frame

BDU-06S BDU-10S BDU-21L

Allowable maximum force for control shaft Nm 10 20 25

Independent Braking System

Vehicle propel applications may require a provision for non-linear control input to reduce controlsensitivity near neutral. Damping or frictional forces may be necessary to produce the desired controlfeeling.

These units do not include any neutral centering device for the swashplate. It is necessary to provide aforce in the machine’s control system that will hold the swashplate at the desired angle. A “ fail safe“ which will return the swashplate to the neutral in the event of linkage failure is recommended.

W Warning

Unintended vehicle or machine movement hazard.The loss of hydrostatic drive line power, in any mode of operation (forward, neutral, or reverse) may causethe system to lose hydrostatic braking capacity. You must provide a braking system, redundant to thehydrostatic transmission, sufficient to stop and hold the vehicle or machine in the event of hydrostaticdrive power loss.


System Design Parameters


Shaft Load

The maximum allowable radial road of input shaft (Re) is based on the maximum external moment andthe distance from the housing surface to the input shaft. The limit of radial load of input shaft is shownthe figure below:

No Load

No Load

No Load

Tout (No Load)

Tin

Distance (L)

P400215

R e

The maximum shaft thrust in (Tin) of input shaft is 18% of allowable radial road (Re) of the input shaft.The shaft thrust out (Tout) of the input shaft should be no load. The radial and thrust load of the outputshaft should be no load.

BDU-21L/21H

200

400

600

800

1000

1200

1400

0 10-10 20 30 40 50

BDU-10S/10L,BDP-10L

200

400

600

800

0 10 20 30 40 500 10

200

400

600BDU-06S

20 30distance (L) mm → distance (L) mm → distance (L) mm →

Re N

→

Re N

→

Re N

→

P400216

Shaft Options

The BDU transmissions are available with a variety of straight key, JIS Spline, JIS Serration, SAE Splineshaft for input shaft, PTO shaft and output shaft. Details are shown in the Installation Drawings on page35.




Shaft Options : BDU-06S/10S/10L

A

B C

P400217

Shafts:A = Output ShaftB = PTO ShaftC = Input Shaft

Output Shaft Options

Output Shaft Code BDU-06S BDU-10S BDU-10L

JIS Spline

15 x 13 x 1.0 J13

20 x 18 x 1.0 K18

SAE Spline 32/64-16T S16

PTO Shaft / Input Shaft Options

PTO Shaft Input Shaft Code BDU-06S BDU-10S BDU-10L

None DStraight-Keyed D =15 mm

KA0

KB0

KB1

Straight d =12.7 mm d D

Straight-Keyed D =15 mm

PB1

PB3

JIS Serration12 x 23 x 0.5 D


PB2

PB4

This charge pump housing is applied only for BDU-10L.




Shaft Options : BDU-21L/21H

A

P400355

BC

Shafts:A = Output ShaftB = PTO ShaftC = Input Shaft

Output Shaft Options

Output Shaft Code BDU-21L BDU-21H

JIS Spline

20 x 14 x 1.25 J14

20 x 18 x 1.0 J18

SAE Spline 32/64-22T S22

PTO Shaft / Input Shaft Options

PTO Shaft Input Shaft Code BDU-21L BDU-21H

None DStraight-Keyed D =17 mm

KC1

KC2

JIS Spline15 x 13 x 1.0 D


PC1

PC2

SAE Spline32/64-16T D


PC3

PC5




Bypass Valve

In some applications, it is desirable to move the vehicle over short distances at low speed withoutstarting the engine. A bypass valve allows oil to be routed from one side of the pump/motor circuit to theother, thus allowing the motor to turn. The bypass valve must be fully closed during normal vehicleoperation. BDU series transmissions utilize a spool-type bypass valve. The bypass valve plunger must bedepressed manually to open the valve. This connects both sides of the main hydraulic circuit to thehousing case and allows fluid to circulate without rotating the pump, prime mover and motor. A springcloses this valve on the 6S, 10L and 10S transmissions, while charge pressure closes the valve on the 21Land 21H transmissions. The BDP-10L pump utilizes a screw-type bypass valve.

High Pressure Relief Valve (hprv) and Charge Check (Overpressure Protection)

The BDU-21H transmission is available with a combination charge check and high pressure relief valveassembly. High pressure relief valves are available in a range of settings as shown in the Model Code onpage 29. Individual port pressure settings may be specified. The high pressure relief valve settings are adifferential pressure (referenced to charge pressure).

Check and Relief Valve for BDU-21H

Option CodePressure setting

Orificebar [psi]

R0 210 -

R1 175 -

R2 140 -

RA 210 0.7 Twin

RB 210 0.85

P400219

1

2

3

6

5

4

1. Charge circuit2. Check and relief valve3. Working loop (Main hydraulic circuit4. Bypass valve5. Working loop (Main hydraulic circuit)6. Check and relief valve




Charge Check Valve with Orifice

The BDU transmissions are equipped with charge check valves. In some applications, it is desirable to usecharge check valve with orifice for expanding null dead band, giving both the safety measure to preventthe vehicle movement in the neutral position of the control shaft and easy adjustment of neutral positionwhen connected to vehicle linkage. The orifice connects the working loop, which is a main hydrauliccircuit, to a charge circuit. It always allows some internal leakage to ensure the expanding null dead bandaround neutral position of control shaft. However, it decreases the volumetric efficiency, particularly athigh system pressure in the working loop. It is recommended to install the orifice in a specific workingloop, which is pressurized when the vehicle moves in reverse. The orifice diameter improves the nulldead band but decreases the volumetric efficiency. A cross section and characteristics are shown below.The charge check valves with orifice are available in a range of orifice diameters as shown in the ModelCode on page 29.

with Orifice

Reverse

DB-OR

Neutral-ORNeutral-STD

DB-STD

Control Shaft Angle

Forward

Output Flow

P400220

Input Speed: 3000min-1, Oil Temp: 50 °C , No Load

Features UnitBDU-10S/10L/21L/21H

Without Orifice

Deadband of Control Shaft Angle(DB-STD) [degree] Approx. 0.1

Features Unit

BDU-10S/10L BDU-21L BDU-21H

Orifice diameter [mm]

Ø 0.7 Ø 0.8 Ø 1.0 Ø 1.2 Ø 0.85 Ø 0.7 twin

Deadband of Control Shaft Angle(DB-OR) [degree] Approx.

0.5Approx.

0.7Approx.

0.5Approx.

0.7Approx.

0.35Approx.

0.5




Charge Check with Orifice

BDU-10SBDU-10L

BDU-10L Check Valve

P400221

BDU-10S Check Valve

P400222

Check Valve (Ball) without Orifice

P400223

Check Valve with Orifice

P400224

Orifice

BDU-21L

P400225

Check Valve (Ball) without Orifice

P400226

Check Valve with Orifice

P400227

Orifice

BDU-21H

P400228

Check & Relief without Orifice

P400229

Check & Relief with Orifice

P400230

Orifice




Optional Integrated Reservoir

The BDU-06S and BDU-10S are designed with optional integrated reservoir. The optional Integratedreservoir is shown in the figure on the right.

25.5

1415

7/8-14UNF

P400231

30 -0.8 0

Dimensions of Widths Across Flats of Hexagon

Ø 71

Ø 6075

.5 ±

1.5

P/N BDU-10S-TANK

Filter

The BDU-10S is designed with Built-in filter. BDU-21L/H is designed with optional Integrated filter, whichis shown in the figure on the right. The filter connection is designed with consideration given to thescrewed type steel pipe fitting that is an option. An external filter is required in the charge pump inlet linefor BDU- 10L and BDP-10L. This filter should not have a bypass and should be changed regularly toensure system reliability.

70.8

69

32

3/4-16 UNF screw

3/4-16 UNF screw

Screwed Type

P/N H-3101069

P/N 05EL-BD

Steel Pipe Fitting

Ø 3

7

Ø 5

9.7

Ø 8

4

P400232




Fan

The operating temperature of the BDU transmission becomes hot when operated at a heavy load forlong, continuous time. To avoid a reduction in the life of the BDU transmission or risking immediatefailure, a cooling fan may be installed on the input shaft or external reservoir to be effective as heatexchanger may be installed. The BDU transmission is available with optional fan integrated with the beltdrive device for the input shaft. The detailed outlines are shown in the Installation Drawings on page 35.

Optional Fan for Cooling

P/N Rotation

H-1030826 CW

H-1030827E CCW

CCW

31.8

Rotation Wind

Ø 7.1

Ø 1

77.8

P400233

Optional Fan for Cooling

P/N Rotation

H-1030826 CW

H-1030827E CCW




Selecting the proper transmission for a vehicle begins with determining the maximum system pressureby using tractive effort of the vehicle and the maximum vehicle speed required. The transmissionselected must meet both requirements.

Maximum System Pressure

Maximum operating system pressure should be calculated at maximum tractive effort condition.Maximum tractive effort condition is assumed at vehicle with maximum weight transfer from pushing orpulling implements at maximum grade of slope. First, calculate BDU motor torque by using the followingequation:

Equation-1

• MTQ_ME = Output torque of BDU motor at maximum tractive effort condition in Nm

• PR_ME = Pull Ratio at maximum tractive effort (See below)

• VW_ML = Gross vehicle weight with maximum loaded weight in kgf

• LR = Tire Radius in meters

• FDR = Transaxle Final Drive Ratio

• EFF_FD = Transaxle Final Drive Efficiency

The hydrostatic transmissions in many applications are used in conjunction with readily availabletransaxles. In order to meet both requirements of high output torque at operating mode and high speedat traveling mode, the transaxles with two kinds of shifts, Hi and Lo are used in some applications. In suchtransaxles, use Lo shift ratio as FDR in equation-1 and -4 to calculate maximum system pressure.

A useful parameter for determining tractive effort is "Pull Ratio". Pull Ratio is a dimensionless term that isthe ratio of tractive effort to gross vehicle weight. It is generally constant for each class of vehicle. Thesevalues may be used when actual vehicle tractive efforts are not known. In a typical agriculture applicationfor BDU application, Pull Ratio for the highest load mode can be calculated from the primary componentsof pull ratio: rolling resistance, grade motion resistance by a function of slope, machine function motionresistance and drive configuration motion resistance. In such cases, pull ratio is determined by using thefollowing equation:

Equation-2

• RR = Rolling resistance. See SD Application manual• GR = Motion resistance of Grade. See SD Application manual• MF = Machine function motion resistance, See SD Application manual• DC = Drive configuration motion resistance, See SD Application manual

Then, maximum system pressure can be calculated by using MTQ_ME and the following quation:

Equation-3

• SPR_ME = Maximum BDU system pressure operated at Maximum tractive effort mode in bar• DP = Motor Displacement of selected BDU transmissions in cm3

• MEF_MO = Motor Mechanical Efficiency of BDU transmission in this mode

Select appropriate BDU size which will give SPR_ME, not to exceed the value of maximum systempressure allowed in the technical specification, because BDU is generally applied without systempressure relief valves.


Component Selection


If appropriate BDU size satisfies maximum system pressure, determine the BDU output speed atmaximum tractive effort mode by using the following equation:

Equation-4

• MSP_ME = The BDU output speed at maximum tractive effort condition in min-1 (rpm)• VSP_ME = The vehicle speed requested for maximum tractive effort mode in m/s

Confirm the BDU output speed calculated to satisfy the maximum output speed (intermittent) in thetechnical specification.

Input Power

Calculate required input power of BDU by using the following equation:

Equation-5

• PW_ME = BDU Input power required for maximum tractive effort mode in kW

• OEF_BDU = BDU unit overall efficiency for this mode

If PW_ME is larger than Input power (Maximum) of selected BDU, VSP_ME should be limited to satisfymaximum BDU input power. If the calculated speed exceeds the technical specification, the transaxlefinal drive ratio or tire size may need to be changed.

Maximum vehicle speed is generally recommended in traveling mode. Calculate maximum BDU speed byusing the following equation:

Equation-6

• MSP_TR = The BDU output speed for traveling mode in min-1 (rpm)• VSP_TR = The vehicle speed requested for traveling mode in m/s

Use Hi shift ratio as FDR in Equation-6 if the Transaxle Final Drive has two shifts.

Confirm MSP_TR to satisfy the maximum output speed (intermittent) in the technical specification. IfMSP_TR is not satisfied, FDR (Hi shift) may need to be changed. It is also necessary to determine thesystem pressure for traveling mode (SPR_TR) to satisfy maximum system pressure (intermittent) allowedin the technical specification. SPR_TR is calculated by using equation -1, -2 and -3 with parameters oftraveling mode.

Calculate the required BDU input shaft speed to satisfy maximum BDU output shaft speed by using thefollowing equation:

Equation-7

• PSP_RIN = required BDU input shaft speed in min-1 (rpm)• VEF_BDU = BDU volumetric efficiency for this mode

Confirm BDU input shaft speed is larger than PSP_RIN.


Component Selection


Unit Life

The unit life of selected BDU transmissions should be determined by using average system pressureunder overall operating modes, because vehicles generally operate in their maximum tractive effortmode for a small percentage of their life. If a duty cycle for a transmission is known, weighted averagesystem pressure can be calculated and can estimate the life expectancy of the transmission selected. Theduty cycle can be assumed for instances including several modes. Calculate weighted average systempressure by using the following equation:

Equation-8

• SPR_AV = weighted average system pressure. This is the mean pressure of the duty cycle in bar

• SPR_ME = the system pressure for maximum tractive effort mode and T_ME is its time in the dutycycle

• SPR_NE = the system pressure at the normal tractive effort which means with normal weight and at0% Grade and T_NE is its time in the duty cycle

• SPR_TR = the system pressure for traveling mode and T_TR is its time in the duty cycle

If needed, define other system pressures at other operating conditions and add them to the equation.

The BDU Unit Life hours at weighted average pressure is determined by using the following equation:

Equation-9

• LH = Unit Life hours of selected BDU at the duty cycle estimated• SPR_RH = The system pressure at Rated Unit Life (See table A)• PSP_IN = The input shaft speed of BDU unit. Normally, input shaft speed of BDU is constant

Confirm LH of selected BDU to satisfy the Life requirement. If LH is shorter than the requestedspecification, the next larger size transmission may be needed and the repeat the calculation forComponent Selection on other BDU using Equation -1 through -9. Contact Danfoss for assistance incorrect transmission selection.

Table A

Parameter UnitFrame

BDU-06S BDU-10S BDU-10L BDU-21L BDU-21H

RH hour 300 300 1000 1600 2500

SPR_RH bar 55 70 70 70 70

BSP_OP min-1 3000 3000 3000 3000 3000


Component Selection


BDU : Model Code (A - B - C - D - E)

JF GE H KBDU -

B DCA

A - Displacement

Code Description 06S 10S 10L 21L 21H

06 6 cm3

10 10 cm3

21 21 cm3

B - Design


S Standard

L Long Life

H High Pressure

C - Rotation


W Bi-directional rotation

R Clockwise rotation

L Counter-Clockwise rotation

D - Contrl Arm Location


R Right-hand side viewing from input shaft (pump located upside)

L Left-hand side viewing from input shaft (pump located upside)

E - Output Shaft


J13 JIS Spline 15×13×1.0



K18 JIS Spline 15×18×0.75

S16 SAE Spline 32/64 - 16T

S22 SAE Spline 32/64 - 22T


Model Code


BDU : Model Code (F - G)

JF GE H KBDU -

B DCA

F - Check & Relief Valve (Left-hand side viewing from Housing)


BB Ball Check Valve

00 Poppet-type Check Valve

07 Check Valve w/dia = 0.7 orifice




R0 Check and High Pressure Relief Valve 210 bar



RA Check and High Pressure Relief Valve 210 bar w/dia=0.7 twin orifice

RB Check and High Pressure Relief Valve 210 bar w/dia=0.85 orifice

G - Check & Relief Valve (Right-hand side viewing from Housing)


BB Ball Check Valve









RA Check and High Pressure Relief Valve 210 bar w/dia=0.7 twin orifice

RB Check and High Pressure Relief Valve 210 bar w/dia=0.85 orifice


Model Code


BDU : Model Code (H - J - K)

JF GE H KBDU -

B DCA

H - Input shaft / PTO shaft Configuration & Charge Pump Displacement


KAO Straight-keyed D=15mm shaft / None & w/o Charge Pump

KBO Straight-keyed D=15mm shaft / None & w/o Charge Pump

KB1 Straight-keyed D=15mm shaft / None & w/1.9cm3 Charge Pump

KC1 Straight-keyed D=17mm shaft / None & w/2.1cm3 Charge Pump

KC2 Straight-keyed D=17mm shaft / None & w/3.1cm3 Charge Pump

PB1 Straight-keyed D=15mm shaft /Straight 12.7 mm shaft & w/o ChargePump

PB2 Straight-keyed D=15mm shaft /JIS Serration 12 x 23 x 0.5 shaft & w/oCharge Pump

PB3 Straigt-keyed D=15mm shaft /Straight 12.6 mm shaft & w/2.4cm3

Charge Pump PB4

PB4 Straight-keyed D=15mm shaft /JIS Serration 12 x 23 x 0.5 shaft & w/2.4cm3 Charge Pump

PC1 Straight-keyed D=17mm shaft /JIS Spline 15 x 13 x 1.0 shaft & w/2.1cm3

Charge Pump

PC2 Straight-keyed D=17mm shaft /JIS Spline 15 x 13 x 1.0 shaft & w/3.1cm3

Charge Pump

PC5 Straight-Keyed D=17mm shaft /SAE Spline 32/64 -16T & w/2.1cm3

Charge Pump

PC6 Straight-Keyed D=17mm shaft /SAE Spline 32/64 -16T & w/3.1cm3

Charge Pump

J - Bypass & Nuetral Valve


N None

A w/Nuetral Valve Pressure 35 bar w/dia=1.0 orifice

B w/Bypass Valve

K - Special Hardware


NNN None

WOL Oil-filled in case


Model Code


BDP : Model Code

JF GE H KBDP - 1 0 L R N N N N N NK B 1

B DCA

A - Displacement

Code Description 10L

10 10 cm3

B - Design


L Long Life

C - Rotation


R Clockwise rotation

L Counter-Clockwise rotation

D - Control Arm Location


R Right-hand side viewing from input shaft (main port located upside)

E - Output Shaft


N None

F - Check & Relief Valve (Left-hand side viewing from Housing)


BB Ball Check Valve


07 Check Valve w/dia=0.7 orifice


G - Check & Relief Valve (Right-hand side viewing from Housing)


BB Ball Check Valve




H - Input / PTO shaft Configuration & Charge Pump Displacement


KB1 Straight 15mm shaft/None & w/1.9cm3 Charge Pump


Model Code


J - Bypass Valve


B w/Bypass Valve

C w/Bypass Valve w/orifice dia=0.5

K - Special Hardware


NNN None


Model Code


Housing Installation

The center section of BDU transmission has 4 holes for fixing screws. The screws should be inserted in theholes and tightened to specifications.

*Fitting Torque 1569 ~ 2058 N·cm

Shaft Installation

The input shaft of the BDU transmission should be connected to the prime mover by a belt drive device,sheave or coupling. When using a belt drive device, the radial load on the input shaft should not exceedthe maximum allowable load shown in Shaft Load on page 18.

When installing the BDU motor shaft to the gearbox or to other devices directly, utilize the groove on thecenter section of the BDU transmission, which is located concentric to the motor shaft, to ensure theaccuracy of concentricity. When using the coupling for connection of the shaft, ensure the accuracy ofconcentricity is kept in the region of ±0.025mm. Do not beat the coupling strongly into the shaft with ahammer.

It is recommended the shaft to be lubricated when using a spline shaft.

Start Up Procedure

After installing the BDU transmission and corresponding pipeline connection, remove the case drain portplug from the housing. Fill the BDU transmission case with the recommended oil through the drain port.

BDU-10S is filled with oil at the plant shipment.

Make sure the control shaft of the BDU transmission is set to the neutral position. The BDU transmissionpump must be at zero position. Depress the bypass valve plunger manually to connect both side of themain hydraulic circuit to housing case. Allow the prime mover to turn at idling speed. Turn the controlshaft and oil fills into main circuits. Stop depressing the bypass valve plunger. Then, the output shaft willstart to turn. Check the oil tank or reservoir level and refill the oil to the proper level if necessary. Repeatthe control shaft movement from full displacement in one direction to full displacement in the oppositedirection. Oil should not contain air trapped in the oil during the initial operation.

Operation

Check all joints and connections for leaks, and check that the oil tank or reservoir level is proper at thetime of first operation and every day.

Start the prime mover turning in the neutral position of the control shaft of the BDU transmission.

Maintenance

If some water, dust or grease are mixed in, with the transmission oil, change to new recommended oil.Always keep at less than 0.1 % water in the transmission oil. It is recommended to change oil and filterevery year or at the every 500 operating hours.


Recommended Installation and Maintenance


BDU-06S : Ports and Dimensions

C2.4

3.5

22 3

4.1

R7.5

A

a b

B

A

A

27 ± 0.5

15

19Bypass Valve

68 ± 0.5

11.9 ± 0.1

56 ±

0.5

26.5 ± 0.514 ± 0.2

51 ± 0.4

Reservoir Fitting

7/8-14UNF-2BSAE Straight THD.O Ring Boss(Both Sides)

55 ± 0.5

65.5 ± 0.4

52

48

R7.5

48

65.5 ± 0.4

55 ± 0.5

Reservoir Fitting

7/8-14UNF-2BSAE Straight THD.O Ring Boss

60 ±

0.5

65 ±

0.0

5

45 ±

0.1

845

± 0

.18

62.4

± 0

.7

51 ±

0.8

2.9

45 ± 0.1845 ± 0.18

25.5

20B

ypas

s V

alve

Op

en

Byp

ass

Val

veC

lose

Section A-A

View C

Ø 6

5

Ø 3

5

Ø 4

7+0

.03

0

56 +0.8-0.5

91 +0.8-0.5

97 +1-0.15

Ø 1

50 0.

036

114 +1-0.15

15° +0.5-2.5 15°

+0.5-2.5

(30)

144 +2-1

5+0

.03

0

4- Ø 8.7

Ø 71

Ø 6

52

+0.20

P400234

Option Code R L

Input Rotation as Seen From A Direction CW CCW

Control Shaft Rotation a b a b

Output Rotation as Seen From B Direction CCW CW CW CCW

The tightening torque to install HST is 1569 to 2058 N·cm.


Installation Drawings


BDU-06S : Control Arm Location

THRTHR

Left-hand side viewing from input shaft(when pump located upside)Option Code : L

Right-hand side viewing from input shaft(when pump located upside)Option Code : R

View B-B

B B

10 ± 0.2

12

7.57.5

8181

-0.006-0.024

13.5 +0.8013.5 +0.8

0

Ø 5+0.12

0Ø 5+0.12

0

P400235

BDU-06S : Motor Shaft

174 ± 0.5

Involute Spline

Fillet Root Side FitSAE 1963 class 1Pitch Diameter = 12.7Pressure Angle = 30°Number of Teeth = 16Spline Pitch = 32/64

Involute Spline

JIS 15x13x1.0 class aTooth Profile Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 13Pitch Diameter = Ø13.0Addendum Modification Coefficient = 0.8

300

-2.530 0-2.5

200

-2.55 0-2.5

Ø 1

4.8

Ø 1

5

Ø 1

5

0 -0.1

5

Ø 1

3.49

50 -0

.15

P400236




BDU-10S/10L : Ports and Dimensions

103

20 20

3.5

6

a b

54.5 54.5

63

2.9

B

A

BDU-10L

Charge PumpSuction Port

Reservoir Fitting

7/8- 14UNF-2BSAE Straight THD.O Ring Boss(Both Sides)

67 ± 0.5

61.5 ± 0.4

21°

15°

+0.5-2.5 21°

+0.5-2.5

121 +1-0.15

14 ± 0.2

27 ± 0.5 18 ± 0.3

97 +0.8-0.5

Ø 4

7+0

.03

0

C

25 ± 0.5

66.7

5 ±

0.5

49 ±

0.5

66.5

± 0

.575

± 0

.05

65 ±

0.8

77.4

± 0

.7

Bypa

ss V

alve

Clo

se

Bypa

ss V

alve

O

pen

30

Reservoir Fitting

7/8- 14UNF-2BSAE Straight THD.O Ring Boss

Reservoir Fitting


BDU-10L

Charge Pump Suction Port7/8- 14UNF-2BSAE Straight THD.O Ring Boss

25 ± 0.5

68.5 ± 0.5 68.5 ± 0.5

Bypass Valve

View C

53 ± 0.18 53 ± 0.18

53 ±

0.1

853

± 0

.18

Ø 6

Ø 75

4- Ø 9 THR

Mounting Holes

0-0.3

P400237

Option Code R L



Output Rotation as Seen From B Direction CW CCW CCW CW





BDU-10S/10L : Control Arm Location

7.5

84

7.5

84

E

E

E

E



13.5 +0.80

13.5 +0.80

5 +0.120

5 +0.120

Ø12

-0.0

06-0

.024

Ø12

-0.0

06-0

.024

10 ± 0.15

View E-E

P400238




BDU-10S/10L : Motor Shaft

17

4

Involute Spline

JIS 15x13x1.0 class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 13Pitch Diameter = Ø13.0Addendum Modification Coefficient = 0.8

Involute Spline

JIS 15x18x0.75 class aTooth Profile = Short TeethModule = 0.75Pressure Angle = 20°Number of Teeth = 18Pitch Diameter = Ø13.5Addendum Modification Coefficient = 0.5

Shaft : JIS 15x18x0.75Option Code : K18

Shaft : JIS 15x13x1.0Option Code : J13

Shaft : SAE 32/64-16TOption Code : S16

Involute Spline

Fillet Root Side FitSAE 1963 class 1Pitch Diameter = 12.7Pressure Angle = 30°Number of Teeth = Ø16Spline Pitch = 32/64

4 ± 0.5

Ø14

.8

Ø15

Ø15

0 -0.1

5

Ø13

.495

Ø15

0 -0.1

5

Ø14

.80 -0

.1530 0

-2.5

30 0-2.5

24 0-2.5

2.5 0-2.5

5 0-2.5

2.5 0-2.5

P400239




BDU-10S : Shaft Configuration

F

F

G

G

F

F

3030 8 818

830

F

F

3

9.6 ± 0.1

11.9 ± 0.1

Pump Shaft : 15mm Straight KeyedPTO Shaft : NoneCharge Pump : NoneOption Code : KB

Pump Shaft : 15mm Straight KeyedPTO Shaft : 12.7mm Straight KeyedCharge Pump : NoneOption Code : PB1

Pump Shaft : 15mm Straight KeyedPTO Shaft : Serration 12x23x0.5Charge Pump : NoneOption Code : PB2

Model Involute Serration

Module = 0.5Pressure Angle = 45°Number of Teeth = 23Pitch Diameter = Ø11.5

(Effective Length of Spline)

165 +2-1

165 +2-1

165 +2-124 +1

-2

30 +1-2

22 +0.50

Ø15

0 -0.0

36

Ø15

0 -0.0

36

5+0

.03

05

+0.0

30

Ø12

0 -0.0

5

Ø15

0 -0.0

36

Ø12

.70 -0

.011

Section F-F

Section G-G

P400241




BDU-10L : Shaft Configuration and Charge Pumps Displacement

H

H

I

I

30

R1

3 18

1.65 14

17MAX.

MAX.

25

J8

33 33

2-R7

H

H

30

16

8

10

33 33

2-R7

2-R7

33 33

830J

25

H

H

2-R0.2

2-R0.5

1.65 1.4

1.7

R1

165 +2-1

165 +2-1

2.7 +0.230

165 +2-150.1+1

-2

55 +1-2

22 +0.50

Ø15

0 -0.0

36Ø

150 -0

.036

Ø31

.8 ±

0.0

5

(Ø35

)Ø

150 -0

.036

5+0

.03

0

5+0

.03

0

Ø42

Ø42

Ø35

-0.0

2-0

.05

Ø35

-0.0

2-0

.05

Ø12

0 -0.0

5Ø

12.6

0 -0.0

18

View J

11.9 ± 0.19.6 ± 0.1

Section H-HSection I-I

Pump Shaft : 15mm Straight KeyedPTO Shaft : NoneCharge Pump : 1.9 cc/revOption Code : KB1

Pump Shaft : 15mm Straight KeyedPTO Shaft : Serration 12x23x0.5Charge Pump : 2.4 cc/revOption Code : PB4

Pump Shaft : 15mm Straight KeyedPTO Shaft : 12.7mm Straight KeyedCharge Pump : 2.4 cc/revOption Code : PB3

Ø56

Ø58

Ø58

Ø41


Model Involute Serration

Module = 0.5Pressure Angle = 45°Number of Teeth = 23Pitch Diameter = Ø11.5

P400240




BDU-21L/21H : Ports and Dimensions4.

5

3.5

6677.5

16

30

a b

Byp

ass

Valv

e C

lose

Byp

ass

Valv

e O

pen

4

6161

7878

Bypass Valve

B

A

7360

Ø 4

7+0

.03

0

C

150 ± 1.0

60 ± 0.7

122 ± 1.0134 ± 1.5


9/16- 18UNF-2BSAE Straight THD.O Ring BossIn case of External Filter


9/16- 18UNF-2BSAE Straight THD.O Ring BossW/Option Filter(Both Side)

Charge Pump Suction Port

3/4- 16UNF-2BSAE Straight THD.O Ring BossIn case of External Filter

Drain Port

3/4- 16UNF-2BSAE Straight THD.O Ring Boss(Both Side)

Drain Port


Plug for C & HPRV

Only for BDU-21H(Both Side)

Charge Pump Suction Port

In case of External Filter

View C

22° +0° 40’

-2° 10’22°

+0° 40’-2° 10’55 ± 0.555 ± 0.5

85 ±

0.0

753

± 0

.18

53 ±

0.1

8

53 ± 0.18 53 ± 0.18

80.5

4- Ø 8.5 THRØ 90

Mounting Holes

P400243

Option Code R L



Output Rotation as Seen From B Direction CCW CW CW CCW





BDU-21L/21H : Control Arm Location

99

97

E

E

E

E

97



P400242

15 +0.80 15 +0.8

0

Ø6 +0.120

Ø6+0.12

0

Ø15

-0.0

06-0

.030

Ø15

-0.0

06-0

.030

12 ± 0.2

View E-E




BDU-21L/21H : Motor Shaft

Model Involute Spline

20x14x1.25 class aTooth Profile = Short TeethModule = 1.25Pressure Angle = 20°Number of Teeth = 14Pitch Diameter = Ø17.5Addendum Modification Coefficient = 0.8


Fillet Root Side FitSAE 1963 class 1Pressure Angle = 30°Number of Teeth = 22Pitch Diameter = Ø17.643Spline Pitch = 32/64


20x18x1.0 class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 18Pitch Diameter = Ø18.0Addendum Modification Coefficient = 0.8

21.5 0-0.5 16 2

32

32

54

37



Shaft : SAE 32/64-22TOption Code : S22

Ø20 Ø

19.7

5

0 -0.1

5

Ø20

0 -0.1

Ø18

.263

0 -0.1

5

Ø20

Ø19

.8


P400244




BDU-21L/21H : Shaft Configuration and Charge Pump Displacement

7

R10

40 40

18

G

F

F

25 ± 0.25

15

26 3

185 ± 2.0

13.9 ± 0.1

336

F

F

1640 40

R7

10

R7

40 40

336

F

F

18

12

Ø17

0 -0.0

36Ø

170 -0

.036

Ø40

60°

Ø72

Ø40

Ø72

Ø74

Pump Shaft : 17mm Straight Keyed (Key Length 36mm)PTO Shaft : NoneCharge Pump : 3.1cc/rev (for 21H)Option Code : KC2

Pump Shaft : 17mm Straight Keyed (Key Length 36mm)PTO Shaft : NoneCharge Pump : 2.1cc/rev (for 21L)Option Code : KC1

Pump Shaft : 17mm Straight Keyed (Key Length 26mm)PTO Shaft : Involute Spline JIS 15x13x1.0Charge Pump : 2.1cc/rev (for 21L), 3.1 cc/rev (for 21H)Option Code : PC1 (2.1cc/rev), PC2(3.1 cc/rev)

195 ± 2.0

195 ± 2.0

65 ± 2.0

35 0-0.5

18+0.5

0

Ø15

Ø14

.80 -0

.1

Ø17

0 -0.0

36

5+0

.03

0

Ø42

Ø36

0 -0.0

39

4.7+0.25

0Model Involute Spline

JIS 15x13x1.0 Class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 13Pitch Diameter = Ø13.0Addendum Modification Coefficient = 0.8 View G-G

Section F-FP400245




189 ± 2.0

330

65 ± 2.0

25 ± 0.25

22

18 15

F

F

40 40

R10

7

G

G

7

R10

40 40

F

F

15

62± 2.0

26 3

185 ± 2.0

13.9 ± 0.1

18

15

5+0

.03

0

Section F-F

Ø42

Ø36

0 -0.0

39

4.7+0.25

0

View G-G

Ø74

Ø74

Pump Shaft : 17mm Straight Keyed (Key Length 30mm)PTO Shaft : Involute Spline JIS 15x13x1.0Charge Pump : 2.1cc/rev (for 21L), 3.1 cc/rev (for 21H)Option Code : PC3 (2.1 cc/rev), PC4(3.1 cc/rev)

Pump Shaft : 17mm Straight Keyed (Key Length 26mm)PTO Shaft : Involute Spline SAE 32/64-16TCharge Pump : 2.1cc/rev (for 21L), 3.1 cc/rev (for 21H)Option Code : PC5 (2.1 cc/rev), PC6(3.1 cc/rev)


JIS 15x13x1.0 Class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 13Pitch Diameter = Ø13.0Addendum Modification Coefficient = 0.8


Fillet Root Side FitSAE 1963 Class 1Module = 1.0Pressure Angle = 30°Number of Teeth = 16Pitch Diameter = Ø12.7Spline Pitch = 32/64

35 0-0.5

35 0-0.5

18+0.5

0

+0.50

Ø15

Ø14

.80 -0

.1

Ø15

Ø13

.495

0 -0.1

5

Ø17

0 -0.0

36Ø

170 -0

.036

P400247




BDP-10L : Ports and Dimensions

a b

B

BA

A

53.2

53.2

R46

M6 P1.0L:10 Min

11.0

CCW

1253.2

49.5

6.3

30 8

25.4

25.4

68

19.05

9.5

22 22

68

84

7.5

8650

607475

9.05

58

57.722

22

131101

“A” Gauge Port

9/16- 18UNFSAE O Ring Boss

“A” Gauge Port


“B” Gauge Port


“B” Gauge Port


Bypass Valve

Full Open at“1” RevolutionClosing Torque

Port “A”

Port “B”

Case Drain Port

7/16- 20UNFSAE O Ring BossCharge Pump Inlet


Ø5.00

2- Ø6.73 ± 0.13

Ø95.25

+0.120Ø

12.0

0-0

.006

-0.0

24Ø

10.1

30 -0

.15

10 ± 0.2

Section A-A

21° 21°

Ø15

-0.0

16-0

.036

5.00

+0.0

30

Ø82

.55

0 -0.0

5

11.9 ± 0.1

Section B-B

P400246

Input Rotation CW CCW


Inlet Port "A" "B" "B" "A"

Outret Port "B" "A" "A" "B"




Optional Fan

CCW

A

2.5

23

18.5

31.8

Rotation

(4 Places) Ø7.1

L

Ø45.7

Ø177.8

Ø88.9

Ø24

Wind

+0.4-0.6

Ø840

-1.5

P400248




Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic andelectronic components. We specialize in providing state-of-the-art technology and solutionsthat excel in the harsh operating conditions of the mobile off-highway market. Building onour extensive applications expertise, we work closely with our customers to ensureexceptional performance for a broad range of off-highway vehicles.

We help OEMs around the world speed up system development, reduce costs and bringvehicles to market faster.

Danfoss – Your Strongest Partner in Mobile Hydraulics.

Go to www.powersolutions.danfoss.com for further product information.

Wherever off-highway vehicles are at work, so is Danfoss. We offer expert worldwide supportfor our customers, ensuring the best possible solutions for outstanding performance. Andwith an extensive network of Global Service Partners, we also provide comprehensive globalservice for all of our components.

Please contact the Danfoss Power Solution representative nearest you.

Local address:

Danfoss Power Solutions GmbH & Co. OHGKrokamp 35D-24539 Neumünster, GermanyPhone: +49 4321 871 0

Danfoss Power Solutions ApSNordborgvej 81DK-6430 Nordborg, DenmarkPhone: +45 7488 2222

Danfoss Power Solutions (US) Company2800 East 13th StreetAmes, IA 50010, USAPhone: +1 515 239 6000

Danfoss Power Solutions Trading(Shanghai) Co., Ltd.Building #22, No. 1000 Jin Hai RdJin Qiao, Pudong New DistrictShanghai, China 201206Phone: +86 21 3418 5200

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to productsalready on order provided that such alterations can be made without changes being necessary in specifications already agreed.All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

© Danfoss | May 2017 520L0935 | BC00000025en-US0102

Products we offer:

• Bent Axis Motors

• Closed Circuit Axial PistonPumps and Motors

• Displays

• Electrohydraulic PowerSteering

• Electrohydraulics

• Hydraulic Power Steering

• Integrated Systems

• Joysticks and ControlHandles

• Microcontrollers andSoftware

• Open Circuit Axial PistonPumps

• Orbital Motors

• PLUS+1® GUIDE

• Proportional Valves

• Sensors

• Steering

• Transit Mixer Drives

Comatrolwww.comatrol.com

Turolla www.turollaocg.com

Hydro-Gearwww.hydro-gear.com

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