BD Series Hydrostatic Transmission Technical … Series Hydrostatic Transmission ... BD Series...

BD Series Hydrostatic Transmission

Technical Information

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationRevisions

2

© 2008 Sauer-Danfoss. All rights reserved.

Sauer-Danfoss accepts no responsibility for possible errors in catalogs, brochures and other printed material. Sauer-Danfoss reserves the right to alter its products without prior notice. This also applies to products already ordered provided that such alterations aren’t in conflict with agreed specifications. All trademarks in this material are properties of their respective owners. Sauer-Danfoss and the Sauer-Danfoss logotype are trademarks of the Sauer-Danfoss Group.

Table of RevisionsDate Page Changed Rev.

Jan 2009 35 Correction - Text AB

Jan 2006 - The first edition AA

HistoRy of Revisions

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationContents

3

geneRaL DesCRiPtion

teCHniCaLsPeCifiCations

oPeRatingPaRameteRs

system DesignPaRameteRs

featuRes anD oPtions

BD Series Transmission ................................................................................................................................. 5Design , BDU-10S ............................................................................................................................................ 6Design , BDU-21L ............................................................................................................................................ 7Pictorial circuit diagram, BDU-06/10S ..................................................................................................... 8System schematic, BDU-06/10S ................................................................................................................. 8Pictorial circuit diagram, BDU-10L/21L/21H ......................................................................................... 9System schematic, BDU-10L/21L/21H, BDP-10L .................................................................................. 9

Features and options ..................................................................................................................................10Operating parameters ................................................................................................................................11Fluid specifications ......................................................................................................................................11Efficiency , BDU-06S, 10S ............................................................................................................................12Efficiency , BDU-10L/21L, 21H, BDP-10L ...............................................................................................13

Overview .........................................................................................................................................................14Input speed ....................................................................................................................................................14System pressure ............................................................................................................................................14Charge pressure ............................................................................................................................................15Charge inlet pressure ..................................................................................................................................15Case pressure .................................................................................................................................................15Hydraulic Fluid...............................................................................................................................................15Temperature and Viscosity ........................................................................................................................16

Fluid and filtration ........................................................................................................................................17Reservoir ..........................................................................................................................................................17Control shaft force .......................................................................................................................................17Independent braking system ...................................................................................................................17Shaft load ........................................................................................................................................................18

Shaft options ..................................................................................................................................................19Bypass valve ...................................................................................................................................................21High pressure relief valve (HPRV) and Charge check (Overpressure protection) .................21Charge check valve with orifice ..............................................................................................................22Optional integral reservoir ........................................................................................................................24Filter ..................................................................................................................................................................24Fan .....................................................................................................................................................................24

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationContents

4

ComPonent seLeCtion

moDeLCoDe

ReCommenDeDinstaLLation &maintenanCe

instaLLationDRaWings

Maximum system pressure .......................................................................................................................25 Input power ....................................................................................................................................................26 Unit life .............................................................................................................................................................27

BDU master model code ............................................................................................................................29 BDP master model code ............................................................................................................................31

Housing installation ....................................................................................................................................32 Shaft installation ...........................................................................................................................................32 Start up procedure .......................................................................................................................................32Operation ........................................................................................................................................................32Maintenance ..................................................................................................................................................32

BDU-06S ...........................................................................................................................................................33 BDU-10S ...........................................................................................................................................................35BDU-10L ...........................................................................................................................................................35BDU-21L ...........................................................................................................................................................39BDU-21H ..........................................................................................................................................................39BDP-10L ...........................................................................................................................................................43Optional fan....................................................................................................................................................43

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationGeneral Information

5

the BD hydrostatic transmission can be applied for the transfer and control of power. It provides an infinitely variable speed range between zero and maximum in both forward and reverse modes of operation.the BDu transmission is a “ Z” style transmission with a variable displacement pump and a fixed displacement motor. The variable displacement pump features a cradle swashplate with a direct proportional displacement control. Reversing the direction of tilt of the swashplate reverses the flow of oil from the pump and thus reverses the direction of the motor output rotation. The fixed displacement motor uses a fixed swashplate. The pump and motor are of the axial piston design and utilize spherical-nosed pistons which are held against a thrust bearing by internal compression springs. The fluid supply for the BDu-10L/21L/21H transmission is contained in an external reservoir and passes through an external filter prior to entering the transmission and feeding the fixed displacement gerotor charge pump. Excess fluid in the charge circuit is discharged over the charge relief valve back to the charge pump inlet. Constant flow across a small fixed orifice connecting the charge circuit to the transmission housing supplements the cooling flow.the BDu-06s/10s transmission has a self-contained fluid supply and an integral filter. The fluid is forced through the filter by positive “head” on the fluid in the housing reservoir with an assist by the negative pressure created in the pump pistons as they create a vacuum. Charge check valves in the center section are used to control the makeup flow of fluid to the low pressure side of the loop. A spool type bypass valve is utilized in the transmission to permit moving the vehicle over short distances at low speeds without starting the engine.the BDP-10L is a variable displacement pump to utilize the pump kit of the BDu-10L transmission and designed for vehicle application which is for propel or for auxiliary functions where the system pressure requirements and design life can be met within pump rating.

• Acompletetransmissionfamilytomeettheneedsofsmallvehicleapplication.• 3Transmissionframesizes:6,10,21• PTOCapabilityon“Z”StyleTransmission• VariablePumpVersionof10FrameSizeAvailable(10cm3)• CostEffective,Compact,LightweightDesign• Lownoise• HighEfficiency• WorldwideSalesandService

BD seRies famiLy

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationGeneral description

6

Design BDU SERIES TRANSMISSION cross-section

BDU-10S

Tank

Built-in filter

Center section

Output shaft

Spring

Spool typebypass valve

Spring

Piston

Cylinder block

Thrust bearing

Housing

Shaft Seal

Input shaft

Ball bearing

Cooling fan

Cradle swash plate

520L0935 · Rev AB · Jan 2009


7

Design BDU SERIES TRANSMISSION cross-section

BDU-21L

Workingloop

Output shaft

Suctioncircuit

Charge check valve Spool type

bypass valve

Center section

Charge pump

Charge relief

Charge circuit

Suction port SpringPiston

Input shaft

Ball bearing

Shaft Seal

Housing

Thrust bearing

Cylinder block

Workingloop

Cradle swash plate

(continued)

520L0935 · Rev AB · Jan 20098


PiCtoRiaL CiRCuitDiagRam

BDU-06S, BDU-10S

system sCHematiC

BYPASSVALVE

CYLINDERBLOCKASSEMBLY

INPUTSHAFT

VARIABLESWASHPLATE VARIABLE

DISPLACEMENTPUMP

BDUHOUSING

RESERVOIR

BUILT-INFILTER(BDU-10S)

CHECK VALVE

CHECK VALVECYLINDER BLOCKASSEMBLY

OUTPUTSHAFT

DISPLACEMENTMOTOR

FIXEDSWASHPLATE

CONTROL SHAFT “b”

CONTROL SHAFT “a”

HYDRAULIC CIRCUIT

ø0.7 ø0.8

ø0.7 ø0.8

CHECKVALVEWITHø0.7 ORIFICEOPTIONCODE:07

BALL CHECK VALVE

OPTIONCODE:BB



BALL CHECK VALVE

OPTIONCODE:BB


Workingloop(high pressure)

Workingloop(low pressure) Suction line Case drain fluid

FIXED

520L0935 · Rev AB · Jan 2009

20.6MPa 17.2MPa 13.7MPa 20.6MPa 20.6MPa

20.6MPa 17.2MPa 13.7MPa 20.6MPa 20.6MPa

9


PiCtoRiaL CiRCuitDiagRam

BDU-10L, BDU-21L, BDU-21HBDP-10L (part of pump)

system sCHematiC

BYPASSVALVE

CYLINDERBLOCKASSEMBLY

INPUTSHAFT

VARIABLESWASHPLATE

VARIABLEDISPLACEMENTPUMP

RESERVOIR

FILTER

CHECK VALVE

CHECK VALVE CYLINDER BLOCKASSEMBLY OUTPUT

SHAFT

FIXEDSWASHPLATECOOLING

ORIFICE

CHARGEPUMP

CHARGERELIEFVALVE

SUCTIONPORT

DRAIN PORTHYDRAULIC CIRCUIT



BALL CHECK VALVEOPTIONCODE:BB



ø1.0 ø1.2

CHECKVALVEWITHRELIEF VALVE ANDø0.85 ORIFICEOPTIONCODE:RB

CHECKVALVEWITHRELIEF VALVE ANDø0.7TWINORIFICEOPTIONCODE:RA

CHECKVALVEWITHRELIEF VALVE

OPTIONCODE:R2


OPTIONCODE:R1


OPTIONCODE:R0

ø0.85

ø0.85ø0.7×2

21L

21H

ø0.8

ø0.7×2

BDP-10L

Workingloop(high pressure)

Workingloop(low pressure)

Suction line Case drain fluid

SUCTIONPORT

DRAIN PORTHYDRAULIC CIRCUIT



ø0.8

CHECKVALVEWITHRELIEF VALVE ANDø0.85 ORIFICEOPTIONCODE:RB

CHECKVALVEWITHRELIEF VALVE ANDø0.7TWINORIFICEOPTIONCODE:RA


OPTIONCODE:R2


OPTIONCODE:R1


OPTIONCODE:R0

BALL CHECK VALVEOPTIONCODE:BB



ø1.0 ø1.2

(continued)

DISPLACEMENTMOTOR

FIXED

520L0935 · Rev AB · Jan 200910

BD Series Hydrostatic TransmissionTechnical InformationTechnical specifications

featuRes anD oPtions

features unitProduct type & frame

BDu-06s BDu-10s BDu-10L BDu-21L BDu-21H BDP-10L

Pump

Displacementcm³

[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] N.A. N.A. 1.9 [0.12] 2.1 [0.13] 3.0 [0.18] 1.9 [0.12]

Output Speed

Ratedmini-1

3000 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]

Weightkgf

[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) 7/8-14UNF 7/16-20UNF 9/16-18UNF 7/16-20UNF

Other ports See Installation Drawings

Shaft P34, 36 ~ 38, 40 ~ 42

Bypass Valve O.P. STD STD STD STD STD

Neutral Valve / Orifice N.A./N.A. N.A./O.P. N.A./O.P. O.P./O.P. O.P./O.P. N.A./O.P.

High Pressure Relief Valve N.A. N.A. N.A. N.A. STD N.A.

Filtration W/O built-in ExternalExternal

(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

520L0935 · Rev AB · Jan 2009


11

fLuiD sPeCifiCations viscosity mm²/sec (cSt) [SUS]

Minimum 7 [49]

Continous 12 [70] - 60 [278]

Maximum 1600 [7500]

oil temperature °C [°F]

Minimum −10 [14]

Maximum Continuous 82 [180]

Maximum Intermittent 104 [219]

oPeRating PaRameteRs

Parameter unitProduct type & frame

BDu-06s BDu-10s BDu-10L BDu-21L BDu-21H BDP-10L

Input Speed

Minimum

min-1

1000 600 600 600 600 600

Rated 3000 3000 3600 3600 3600 3600

Maximum 3200 3200 3800 3800 3800 3800

System Pressure

Ratedbar

[psi]

105

[1530]

150

[2185]

210

[3059]

150

[2185]

Maximum150

[2185]

175

[2549]

210

[3059]

245

[3569]

175

[2549]

Charge Pressure bar [psi] N.A. 3 [44] ~ 5 [73]

Charge Inlet Pressure bar [psi] N.A. 0.8 [12] abs

Case Pressure bar [psi] 0.3 [4]

Rated bar

[psi]

0.3 [4]

Maximum (Cold Start) 0.7 [10]

520L0935 · Rev AB · Jan 2009


BDU-06S

ηv

ηmηt

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

BDU-06S

Ou

tpu

t T

orq

ue

Nm

Output Speed min-1

BDU-10S

ηv ηm

ηt

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

BDU-10S

Ou

tpu

t T

orq

ue

Nm

Output Speed min-1

Inputspeed:3000min-1

Oiltemperature:50°CFull Displacement




Oiltemperature:50°C



12

effiCienCy

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


520L0935 · Rev AB · Jan 2009


BDU-10L

ηv ηmηt

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

BDU-10L

Ou

tpu

t T

orq

ue

Nm

Output Speed min-1

BDU-21L/21H

ηv ηm

ηt

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

BDU-21L/21H

Ou

tpu

t T

orq

ue

Nm

Output Speed min-1

BDP-10L 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

%







BDP-10L 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

%


(continued)



13

effiCienCy


Overall EfficiecyOutput flow - Input Speed



520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationOperating Parameters

14

oveRvieW Maintain operating parameters within prescribed limits during all operating conditions.This section defines operating limits given in the table Operating parameters, page 11.

minimum speed is the lowest input speed recommended during engine idle condition.Operating below minimum 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 below this speed should yield satisfactory product life.maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces product life and can cause loss of hydraulic power and braking capacity. Never exceed maximum speed limit under any operating conditions.

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

system pressure is the differential pressure between system ports A and B. It is the dominant operating variable affecting hydraulic unit life. High system pressure, which results from high load, reduces expected life. Hydraulic unit life depends on the speed and normal operating, or weighted average, pressure that can only be determined from a duty cycle analysis.applied pressure is the chosen application pressure found within the order code for the transmission unit. This is the pressure at which the driveline generates the maximum pull or torque in the application.Rated pressure is the design pressure from the transmission unit. Applications with applied pressures at or below this pressure should yield satisfactory unit life given proper component selection guidelines.maximum pressure (Peak) is the highest intermittent pressure allowed under any ircumstances. Applications with applied pressures between rated and peak should be attempted only with application, duty cycles and life expectation analyses. This requires factory approval.

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

inPut sPeeD

system PRessuRe

520L0935 · Rev AB · Jan 2009


15

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

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

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).

CautionPossible component damage of leakage.Operation with case pressure in excess of these limits may damage seals, gaskets, and/or housings, causing external leakage. Performance may also be affected since charge and system pressure are additive to case pressure.

Ratings and performance data are based on operating with hydraulic fluids containing oxidation, rust and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear, erosion, and corrosion of pump motor components. Never mix hydraulic fluids of different types. Thefollowingfluidsaresuitable:• EngineoilsAPIClassificationSL,SJ(forgasolineengines)andCI-4,CH-4,CG-4, CF-4, CF and CD (for diesel engines) • HydraulicOilISO11158-HM(Sealcompatibilityandvanepumpwearresistanceper DIN51524-2 must be met)• HydraulicOilISO11158-HV(Sealcompatibilityandvanepumpwearresistanceper DIN51524-3 must be met)• HydraulicOilDIN51524-2HLP• HydraulicOilDIN51524-3HVLP

CHaRge inLet PRessuRe

Case PRessuRe

HyDRauLiC fLuiDs

520L0935 · Rev AB · Jan 2009


16

Temperature and viscosity requirements must be concurrently satisfied. The data shown in the table, Fluid Specifications, page 11, assume petroleum-based fluids are used.

The high temperature limits apply at the hottest point in the transmission, which is normally the case drain. The system should generally be run at or below the rated temperature. The maximum temperature 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 the ability of oil to flow and transmit power; therefore temperatures should remain over 16˚C [30˚F] above the pour point of the hydraulic fluid. The minimum temperature relates to the physical properties of component materials.

For maximum unit efficiency and bearing life the fluid viscosity should remain in the recommended operating range. The minimum viscosity should be accepted only during brief occasions of maximum ambient temperature and severe duty cycle operation. The maximum viscosity should be permitted only at cold start.

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

temPeRatuRe anDvisCosity

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationSystem design parameters

17

fLuiD anD fiLtRation To prevent premature wear, it is imperative that only clean fluid enters the hydrostatic transmission circuit. Therefore an inlet filter better than β20=1.4 is required in the charge pump inlet line. This filter should not have a bypass and should be changed regularly to ensure system reliability. The BD series hydrostatic transmission requires system filtration capable of maintaining fluid cleanliness at ISO 4406-1999 class 22/18/15 or better.

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

The BDU transmission is designed with direct displacement control (DDC). DDC can be located at either side of the housing. It provides a simple, positive method of control.Movement of the control shaft causes a proportional swashplate movement, thus varying the pump’s displacement from full displacement 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 of technical specifications. A stopper to prevent over-stroke is required at the end of maximum angle of control 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 shaftNm 10 20 25

Vehicle propel applications may require a provision for non-linear control input to reduce control sensitivity near neutral. Damping or frictional forces may be necessary to produce the desired control feeling.These units do not include any neutral centering device for the swashplate. It is necessary to provide a force 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.

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

ReseRvoiR

ContRoL sHaft foRCe

inDePenDent BRakingsystem

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationFeatures and options

0 10

200

400

600BDU-06S

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

BDU-21L/21H

200

400

600

800

200

400

600

800

1000

1200

1400

20 30

0 10 20 30 40 50

0 10-10 20 30 40 50

18

sHaft LoaD The maximum allowable radial road of input shaft (Re) is based on the maximum external moment and the distance from the housing surface to the input shaft. Thelimitofradialloadofinputshaftisshownthefigurebelow:

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 output shaft should be no load.

No Load

No Load

No Load

Tout (No Load)

Re:seefigures

Tin

distance (L)

distance (L) mm →

distance (L) mm →

distance (L) mm →

Re Re

N →

Re

N →

Re

N →

520L0935 · Rev AB · Jan 2009


This charge pump housing isapplied only for BDU-10L.

d D

D

D

19

sHaft oPtions The BDU transmissions are available with a variety of straight key, JIS Spline, JIS Serra-tion, SAE Spline shaft for input shaft, PTO shaft and output shaft. Details are shown in the Installation Drawings, page 33 through page 43.

PTO Shaft

Output Shaft

Output

Shaft

Options

JIS Spline

15×13×1.0

Code:S16

(BDU-06S)

(BDU-10S)

(BDU-10L)

JIS Spline

20×18×1.0

Code:K18

(BDU-10S)

(BDU-10L)

SAE Spline

32/64-16T

Input Shaft

PTO Shaft

Options

Input Shaft

Options

PTO

None

Straight-Keyed D=15mm

Code:KA0(BDU-06S)

KB0 (BDU-10S)

KB1 (BDU-10L)

Straight-Keyed D=15mmStraight d=12.7mm

Code:PB2(BDU-10S)

Code:PB4(BDU-10L)


JIS

Serration

12×23×0.5

Code:J13

(BDU-06S)

(BDU-10S)

(BDU-10L)

Code:PB1(BDU-10S)

Code:PB3(BDU-10L)

BDU-06S

BDU-10S

BDU-10L

520L0935 · Rev AB · Jan 2009


D

D

D

20

sHaft oPtionsContinueD

JIS Spline

20×14×1.25

Code:S22

(BDU-21L)

(BDU-21H)

JIS Spline

20×18×1.0

Code:J18

(BDU-21L)

(BDU-21H)

SAE Spline

32/64-22T

Code:KC1(BDU-21L)

KC2 (BDU-21H)

Code:J14

(BDU-21L)

(BDU-21H)

BDU-21L

BDU-21H

JIS Spline

15×13×1.0

SAE Spline

32/64-16T


Code:PC1(BDU-21L)

PC2(BDU-21H)


Code:PC5(BDU-21L)

PC6 (BDU-21H)

PTO Shaft

Output Shaft

Output

Shaft

Options

Input Shaft

PTO Shaft

Options

Input Shaft

Options

PTO

None


520L0935 · Rev AB · Jan 2009


21

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

The BDU-21H transmission is available with a combination charge check and high pressure relief valve assembly. High pressure relief valves are available in a range of settings as shown in the Model Code, page29, 30 and 31. Individual port pressure set-tings may be specified. The high pressure relief valve settings are a differential pressure (referenced to charge pressure).

HigH PRessuReReLief vaLve (HPRv)anD CHaRge CHeCk

( oveR PRessuRe) PRoteCtion

Check and Relief valve for BDu-21H

option codePressure setting orifice

bar [psi]

R0 210 -

R1 175 -

R2 140 -

RA 210 0.7 Twin

RB 210 0.85

Charge circuit

Check and Relief valve

Bypass valve

Workingloop(Main hydraulic circuit)

Check and Relief valve

BDU-21H Center section

Workingloop(Main hydraulic circuit)

520L0935 · Rev AB · Jan 2009


22

The BDU transmissions are equipped with charge check valves. In some applications, it is desirable to use charge check valve with orifice for expanding null dead band, giving both the safety measure to prevent the vehicle movement in the neutral position of the control shaft and easy adjustment of neutral position when connected to vehicle linkage. The orifice connects the working loop, which is a main hydraulic circuit, to a charge circuit. It always allows some internal leakage to ensure the expanding null dead band around neutral position of control shaft. However, it decreases the volumetric efficiency, particularly at high system pressure in the working loop. It is recommended to install the orifice in a specific working loop, which is pressurized when the vehicle moves in reverse. The orifice diameter improves the null dead 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 Model Code, page 29, 30 and 31.

CHaRge CHeCk vaLve WitH oRifiCe


OilTemp:50˚CNo load

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

WithoutOrifice

Deadband of

Control Shaft Angle

(DB-STD)

[degree] Approx. 0.1

Features Unit

BDU-10S/10L BDU-21L BDU-21LH

Orifice diameter [mm]

φ0.7 φ0.8 φ1.0 φ1.2 φ0.85 φ0.7 twin

Deadband of

Control Shaft Angle

(DB-OR)

[degree]Approx.

0.5

Approx.

0.7

Approx.

0.5

Approx.

0.7

Approx.

0.35

Approx.

0.5

with Orifice

Reverse

DB-OR

Neutral-OR Neutral-STD

DB-STD

Control Shaft Angle

Forward

Output Flow

520L0935 · Rev AB · Jan 2009


BDU-10S/10L

BDU-21L

BDU-21H

23

CHaRge CHeCk WitH oRifiCe

Check Valve (Ball) without orifice

Check Valve with orifice

Check & Relief without orifice

Check & Relief with orifice

BDU-10L Check Valve BDU-10S Check Valve

orifice

orifice

Check Valve (Ball) without orifice

Check Valve with orifice

orifice

520L0935 · Rev AB · Jan 2009


P/N BDU-10S-TANK

P/N H-1030826

CCW

31.8

177.

8

7.1

24

oPtionaL integRateDReseRvoiR

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

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

The operating temperature of the BDU transmission becomes hot when operated at a heavy load for long, continuous time. To avoid a reduction in the life of the BDU transmission or risking immediate failure, a cooling fan may be installed on the input shaft or external reservoir to be effective as heat exchanger may be installed. The BDU transmission is available with optional fan integrated with the belt drive device for the input shaft. The detailed outlines are shown in the installation drawings, page 43.

optional fan for cooling

P/n Rotation

H-1030826 CW

H-1030827E CCW

fiLteR

fan

71

60

75.5

1.

5

25.5

1415

7/8-14UNF30 -0.8

0

±

ø

ø

øRotation Wind

ø

Dimensions ofWidthsAcross Flats of Hexagon

P/N 05EL-BD

70.8

69

59.7

84 37

32

3/4-16UNF screw

3/4-16UNF screw

P/NH-3101069

ø ø

Screwed typesteel pipe fitting

øOption Filter

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationComponent Selection

25

maXimum systemPRessuRe

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

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 or pulling implements at maximum grade of slope. First, calculateBDUmotortorquebyusingthefollowingequation:

MTQ_ME= PR_ME×VW_ML×LR×9.8

FDR×EFF_FD 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=GrossvehicleweightwithmaximumloadedweightinkgfLR = Tire Radius in metersFDR = Transaxle Final Drive RatioEFF_FD = Transaxle Final Drive Efficiency.

The hydrostatic transmissions in many applications are used in conjunction with readily available transaxles. In order to meet both requirements of high output torque at operating mode and high speed at traveling mode, the transaxles with two kinds of shifts, Hi and Lo are used in some applications. In such transaxles, 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 is the ratio of tractive effort to gross vehicle weight. It is generally constant for each class of vehicle. These values may be used when actual vehicle tractive efforts are not known. In a typical agriculture application for BDU application, Pull Ratio for the highest load mode can be calculated from the primary componentsofpullratio:rollingresistance,grademotionresistancebyafunctionofslope, machine function motion resistance and drive configuration motion resistance. In suchcases,pullratioisdeterminedbyusingthefollowingequation:

PR_ME= RR+GR+MF+DC Equation -2

RR = Rolling resistance. See SD Application manualGR = Motion resistance of Grade. See SD Application manualMF = Machine function motion resistance, See SD Application manualDC = Drive configuration motion resistance, See SD Application manual

520L0935 · Rev AB · Jan 2009


26

inPut PoWeR

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

MTQ_ME×62.87SPR_ME =

DP×MEF_MO 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 system pressure allowed in the technical specification, because BDU is generally applied without system pressure relief valves.

If appropriate BDU size satisfies maximum system pressure, determine the BDU output speedatmaximumtractiveeffortmodebyusingthefollowingequation:

VSP_ME×FDR×9.55MSP_ME=

LR 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 the technical specification.

CalculaterequiredinputpowerofBDUbyusingthefollowingequation:

PW_ME=MTQ_ME×MSP_ME×0.000105/OEF_BDU Equation-5

PW_ME=BDUInputpowerrequiredformaximumtractiveeffortmodeinkWOEF_BDU = BDU unit overall efficiency for this mode

IfPW_MEislargerthanInputpower(Maximum)ofselectedBDU,VSP_MEshouldbelimited to satisfy maximum BDU input power. If the calculated speed exceeds the technical specification, the transaxle final drive ratio or tire size may need to be changed.

Maximum vehicle speed is generally recommended in traveling mode.CalculatemaximumBDUspeedbyusingthefollowingequation:

520L0935 · Rev AB · Jan 2009


27

unit Life

VSP_TR×FDR×9.55MSP_TR =

LR 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

Note:UseHishiftratioasFDRinequation-6iftheTransaxleFinalDrivehastwoshifts.

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

Calculate the required BDU input shaft speed to satisfy maximum BDU output shaft speedbyusingthefollowingequation:

PSP_RIN = MSP_TR / VEF_BDU 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.

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

SPR_AV= 3 ( (SPR_ME)3 ×T_ME+ (SPR_NE)3 ×T_NE+(SPR_TR)3 ×T_TR+- - -)

(T_ME+T_NE+T_TR+- - -) Equation - 8

SPR_AV = weighted average system pressure. This is the mean pressure of the duty cycle in barSPR_ME = the system pressure for maximum tractive effort mode and T_ME is its time in the duty cycleSPR_NE = the system pressure at the normal tractive effort which means with normal weight and at 0% 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.

520L0935 · Rev AB · Jan 2009


28

the BDu unit Life hours at weighted average pressure is determined by using the followingequation:

LH = RH×SPR_RH 3

×3000

Equation - 9SPR_AV PSP_IN

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 requested specification, the next larger size transmission may be needed and the repeat the calculation for Component Selection on other BDU using equation -1 through -9. Contact Sauer-Danfoss for assistance in correct 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 mini-1 3000 3000 3000 3000 3000

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationModel code

O-

OO O

O OO O

O

O O

- -

- -

- -

- -- -

- -- -

-

-

O OO O OO O O

O OO O OO OO O

OO O

O

O O

- - -

- -

OO O

O OO O

- -

-O OO -

OO - -

-- -O O-- -

O O

O

--

-OO ---OO -

---

-

O-- --O-- -

-- - -O-- - -O-- - -O-- - -O-- - -

-- - -

---

-

B C D J KBDU

A E F G H

29

BDu master model CodeStandard / AvailableNot Available

Product TypeA:Displacement06 = 6cm3

10 = 10cm3

21 = 21cm3

B:DesignS = StandardL = Long LifeH = High Pressure

C:RotationW =Bi-directionalrotationR = Clockwise rotationL = Counter-Clockwise rotation

D:ControlArmLocationR = Right-hand side viewing from input shaft (pump located upside) L = Left-hand side viewing from input shaft (pump located upside)

E:OutputShaftJ13 = JIS Spline 15×13×1.0J14 = JIS Spline 20×14×1.25J18 = JIS Spline 20×18×1.0K18 = JIS Spline 15×18×0.75S16 = SAE Spline 32/64 - 16TS22 = SAE Spline 32/64 - 22T

F:Check&ReliefValve(Left-handsideviewingfromHousing)BB = Ball Check Valve00 = Poppet-type Check Valve07 = Check Valve w/dia = 0.7 orifice08 = Check Valve w/dia = 0.8 orifice10 = Check Valve w/dia = 1.0 orifice12 = Check Valve w/dia = 1.2 orificeR0 = Check and High Pressure Relief Valve 210 barR1 = Check and High Pressure Relief Valve 175 barR2 = Check and High Pressure Relief Valve 140 barRA = Check and High Pressure Relief Valve 210 bar w/dia=0.7 twin orificeRB = Check and High Pressure Relief Valve 210 bar w/dia=0.85 orifice

06S 10S 10L 21L 21H

06S 10S 10L 21L 21H

06S 10S 10L 21L 21H

06S 10S 10L 21L 21H

06S 10S 10L 21L 21H

06S 10S 10L 21L 21H

520L0935 · Rev AB · Jan 2009


B C D JH KA E F GBDU

O-

O OO

O

O -O OO -

O

-OO ---O

O

O

O

--

--O-- -

-O-- -

-O-- -

O OO OOO

OO

O

O OOO O

-- -

-O-- -

O-- -

-- - -O-- - -

O-- - -O-- - -O--

--

- -

O-- - -

O-- - -

O-- - -

---

- -

O -- - -

- - -

O- - - -O- - - -

- - -

- -

O-- - -O-- - -

06S 10S 10L 21L 21H

30

BDu master model CodeStandard / AvailableNot Available

06S 10S 10L 21L 21H G:Check&ReliefValve(Right-handsideviewingfromHousing)BB = Ball Check Valve00 = Poppet-type Check Valve07 = Check Valve w/dia=0.7 orifice08 = Check Valve w/dia=0.8 orifice10 = Check Valve w/dia=1.0 orifice12 = Check Valve w/dia=1.2 orificeR0 = Check and High Pressure Relief Valve 210 barR1 = Check and High Pressure Relief Valve 175 barR2 = Check and High Pressure Relief Valve 140 barRA = Check and High Pressure Relief Valve 210 bar w/dia=0.7 twine orificeRB = Check and High Pressure Relief Valve 210 bar w/dia=0.85 orifice

H:Inputshaft/PTOshaftConfiguration&ChargePumpDisplacementKAO=Straight-keyedD=15mmshaft/None&w/oChargePumpKBO=Straight-keyedD=15mmshaft/None&w/oChargePumpKB1 =Straight-keyedD=15mmshaft/None&w/1.9cm3 Charge PumpKC1 =Straight-keyedD=17mmshaft/None&w/2.1cm3 Charge PumpKC2 =Straight-keyedD=17mmshaft/None&w/3.1cm3 Charge PumpPB1 =Straight-keyedD=15mmshaft/Straight12.7mmshaft&w/oChargePumpPB2 = Straight-keyedD=15mmshaft/JISSerration12x23x0.5shaft&w/oChargePumpPB3 = Straigt-keyedD=15mmshaft/Straight12.6mmshaft&w/2.4cm3 Charge PumpPB4 = Straight-keyedD=15mmshaft/JISSerration12x23x0.5shaft&w/2.4cm3 Charge PumpPC1 = Straight-keyedD=17mmshaft/JISSpline15x13x1.0shaft&w/2.1cm3 Charge PumpPC2 = Straight-keyedD=17mmshaft/JISSpline15x13x1.0shaft&w/3.1cm3 Charge PumpPC5 = Straight-KeyedD=17mmshaft/SAESpline32/64-16T&w/2.1cm3 Charge PumpPC6 = Straight-KeyedD=17mmshaft/SAESpline32/64-16T&w/3.1cm3 Charge Pump

J:Bypass&NuetralValveN = NoneA = w/Nuetral Valve Pressure 35 bar w/dia=1.0 orificeB = w/Bypass Valve

K:SpecialHardwareNNN = NoneWOL=Oil-filledincase

06S 10S 10L 21L 21H

06S 10S 10L 21L 21H

520L0935 · Rev AB · Jan 2009


B C

1 0 LA D J KE F G H

R N N N K B 1 N N N

O

O

OO

O

O

OOOO

OOOO

O

OO

O

O-

BDP

31

BDP master model CodeStandard / AvailableNot Available

10L

10L

10L

10L

10L

10L

10L

10L

10L

10L

A:Displacement10 = 10cm3

B:DesignL = Long Life

C:RotationR = Clockwise rotationL = Counter-Clockwise rotation

D:ControlArmLocationR = Right-hand side viewing from input shaft (main port located upside)

E:OutputShaftN = None

F:Check&ReliefValve(Left-handsideviewingfromHousing)BB = Ball Check Valve00 = Poppet-type Check Valve07 = Check Valve w/dia=0.7 orifice08 = Check Valve w/dia=0.8 orifice

G:Check&ReliefValve(Right-handsideviewingfromHousing)BB = Ball Check Valve00 = Poppet-type Check Valve07 = Check Valve w/dia=0.7 orifice08 = Check Valve w/dia=0.8 orifice

H:Input/PTOshaftConfiguration&ChargePumpDisplacementKB1=Straight15mmshaft/None&w/1.9cm3 Charge Pump

J:BypassValveB = w/Bypass ValveC = w/Bypass Valve w/orifice dia=0.5

K:SpecialHardwareNNN = None

Product Type

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationRecommended installation and maintenance

32

Housing instaLLation The center section of BDU transmission has 4 holes for fixing screws. The screws should be inserted in the holes and tightened to specifications.*Fitting Torque 1569 ~ 2058 N·cm

The input shaft of the BDU transmission should be connected to the prime mover by a beltdrivedevice,sheaveorcoupling.Whenusingabeltdrivedevice,theradialloadonthe input shaft should not exceed the maximum allowable load shown in shaft load, page 18.WheninstallingtheBDUmotorshafttothegearboxortootherdevicesdirectly,utilizethe groove on the center section of the BDU transmission, which is located concentric to the motor shaft, to ensure the accuracy of concentricity.Whenusingthecouplingforconnectionoftheshaft,ensuretheaccuracyofconcentricity is kept in the region of ±0.025mm. Do not beat the coupling strongly into the shaft with a hammer. It is recommended the shaft to be lubricated when using a spline shaft.

After installing the BDU transmission and corresponding pipeline connection, remove the case drain port plug from the housing. Fill the BDU transmission case with the recommended oil through the drain port. Note:BDU-10Sisfilledwithoilattheplantshipment.Make sure the control shaft of the BDU transmission is set to the neutral position.The BDU transmission pump must be at zero position. Depress the bypass valve plunger manually to connect both side of the main hydraulic circuit to housing case. Allow the prime mover to turn at idling speed. Turn the control shaft and oil fills into main circuits. Stop depressing the bypass valve plunger. Then, the output shaft will start to turn. Check the oil tank or reservoir level and refill the oil to the proper level if necessary. Repeat the control shaft movement from full displacement in one direction to full displacement in the opposite direction. Oil should not contain air trapped in the oil during the initial operation.

Check all joints and connections for leaks, and check that the oil tank or reservoir level is proper at the time of first operation and every day. Start the prime mover turning in the neutral position of the control shaft of the BDU transmission.

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 filter every year or at the every 500 operating hours.

sHaft instaLLation

staRt uP PRoCeDuRe

oPeRation

maintenanCe

520L0935 · Rev AB · Jan 2009

BD Series Hydrostatic TransmissionTechnical InformationInstallation Drawings

C

26.5

56

55 550.5 0.5

0.5

0.1

0.5

11.9

5+

0.03

0

2.4

3.5

14

51

68

114+1-0.15

144+2-1

22 3

15φ

0 -0.0

36

(30)

15+0.5-2.5 15 +0.5

-2.5

15

35

47+

0.03

065

4.1

91+0.8-0.5

27

97+1-0.15

19

56 +0.8-0.5

6065

51

45 45

48 48

65.5

71

4- 8.7+0.2 0

4545

20

R7.5

25.5

52

R7.5

65.5

52

62.4

2.9

6

A

a b

B

A

A

0.5

0.4

0.2

φ

φ

φ

0.5

0.4 0.4

0.5

0.7

0.8

00.5

φ

φ

φ0.18 0.18

0.18

0.18

33

BDu-06s

Option Code R L

Input Rotation

as Seen From A DirectionCW CCW

Control Shaft Rotation a b a b

Output Rotation

as Seen From B DirectionCCW CW CW CCW

Reservoir Fitting7/8-14UNF-2BSAE Straight THD.O Ring Boss(Both Sides)

Byp

ass

valv

e C

lose

Byp

ass

valv

eO

pen

View C

Section A-A

Reservoir Fitting7/8-14UNF-2BSAE Straight THD.O Ring Boss

THR

NOTICE:ThetighteningtorquetoinstallHSTis1569to2058N·cm.

Bypass Valve

Mounting Holes

520L0935 · Rev AB · Jan 2009


34

BDu-06s

7.5

13.5 +0.8 0

5+0.12 0 THRTHR

7.5

13.5

5+0.12 0

0+0.8

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

10

12-0.006-0.024

Control Arm Location

Motor Shaft

15 15

8181

13.4

95 0 -0

.15

30 0-2.5

5 0-2.5

4

14.8

0 -0.1

5

30 0-2.5

2.5 0-2.5

17

View B-B

B B

φ φ

0.2

φ

φ

φ

φ

0.5

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

φ

Involute SplineJIS 15x13x1.0 class aTooth Profile Short TeethModule = 1.0Pressure Angle = 20Number of Teeth = 13Pitch Diameter = 13.0Addendum Modification Coefficient = 0.8

φ

520L0935 · Rev AB · Jan 2009


±0.5

±0.4

+0.5°-2.5° +0.5°-2.5°

±0.2

±0.5 ±0.3

±0.

5±

0.5

±0.5

±0.5

±0.5±0.5

±0.

5±

0.05

±0.

7

±0.18±0.18

±0.

18±

0.18

φ

15°

φ75

φ THR


Reservoir Fitting7/8-14UNF-2BSAE Straight THD.O Ring Boss(Both Sides)

21° 21°

±0.

8

BDU-10LCharge pump suction port7/16-20UNF-2BSAE Straight THD.O Ring Boss

φ6


BDU-10LCharge PumpSuction Port

35

14

27 18

97 +0.8-0.5

103

2049

25

20

30

66.7

5

61.5

67

121+1-0.15

25

3.5

47+

0.03

0

6

a b

54.5 54.5

68.5 68.5

5353

6575

66.5 63

77.4

2.9

53 53

4- 9 0-0.3

B

A

C

View C

BDu-10sBDu-10L


Option Code R L

Input Rotation



Output Rotation

as Seen From B DirectionCW CCW CCW CW

Byp

ass

valv

e C

lose

Byp

ass

valv

eO

pen

Mounting Holes

Bypass Valve

520L0935 · Rev AB · Jan 2009


36

14.8

0 -0.1

5 2.5 0-2.5

17

30 0-2.5

13.5+0.8 0

7.5

5+0.12 0

13.5 +0.8 0

84

7.5

84

E

E

E

E

1013

.495

0 -0.1

5

45 0

-2.5

30 0-2.5

12-0

.006

-0.0

24

12-0

.006

-0.0

24

0+0.125

14.8

5 0 -0

.15

15

2.5 0-2.5

24 0-2.5

4

15

15


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

Control Arm Location

View E-E

Involute SplineJIS 15x13x1.0 class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20Number of Teeth = 13Pitch Diameter = 13.0Addendum Modification Coefficient = 0.8

φ

Involute SplineJIS 15x18x0.75 class aTooth Profile = Short TeethModule = 0.75Pressure Angle = 20Number of Teeth = 18Pitch Diameter = 13.5Addendum Modification Coefficient = 0.5

Shaft : JIS 15x18x0.75Option Code : K18

Shaft : JIS 15x13x1.0Option Code : J13

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

φ

Motor Shaft

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

φ

φ

φ

φ

φ

φ

φ

0.5

φφφ

0.15

Continued

BDu-10sBDu-10L

520L0935 · Rev AB · Jan 2009


37

F

F

G

G

F

F

30

0 -0.0

3630

0 -0.0

36

165 +2-124 +1

-2165 +2-1

8 818

8

12 0 -0

.05

165 +2-1

-0.0

36 0

30

F

F

11.9

5+

0.03

0

9.6

5+

0.03

0

3-0.0

11 0

30 +1-2

22 +0.5 0

Continued

ø15

ø15

±0.1

ø15

ø12

.7

±0.1

BDu-10s

PumpShaft:15mmStraightKeyedPTOShaft:NoneChargePump:NoneOptionCode:KB0

PumpShaft:15mmStraightKeyedPTOShaft:12.7mmStraightKeyedChargePump:NoneOptionCode:PB1

PumpShaft:15mmStraightKeyedPTOShaft:Serration12x23x0.5ChargePump:NoneOptionCode:PB2

Shaft Configuration for 10S

Section G-G

Model Involute SerrationModule = 0.5Pressure Angle = 45°Number of Teeth = 23Pitch Diameter = ø11.5

(Effective Length of Spline)

Section F-F

520L0935 · Rev AB · Jan 2009


BDu-10L

38

H

H

I

I

30 0 -0.0

36

0 -0.0

18

-0.0

2-0

.05

R1

50.1+1-2

3 18

1.65 14

17MAX.

MAX.

25

J8

33 33

2-R7

H

H

30 0 -0.0

36

165+2-116

8

10

33 33

2-R7

2-R7

33 33

0 -0.0

5

8

0 -0.0

36

30J

-2+155

25

H

H

2-R0.2

2-R0.5

0+0.232.7

5+

0.03

0

11.9

5+

0.03

0

9.6

22+0.5 0

1.65 1.4

1.7

R1

-0.0

5-0

.02

165+2-1

165+2-1

Continued

PumpShaft:15mmStraightKeyedPTOShaft:12.7mmStraightKeyedChargePump:2.4cc/revOptionCode:PB3

PumpShaft:15mmStraightKeyedPTOShaft:Serration12x23x0.5ChargePump:2.4cc/revOptionCode:PB4

PumpShaft:15mmStraightKeyedPTOShaft:NoneChargePump:1.9cc/revOptionCode:KB1

Shaft Configuration & Charge Pump Displacement for 10L

ø56 ø41

ø15

ø15

ø58

ø42 ø35

ø12

ø31

.8(ø

35)

ø58

ø12

.6

ø35ø42

ø15

±0.1

±0.1

±0.3

±0.

05

±0.3

MAX.

MAX.

Model Involute SerrationModule = 0.5Pressure Angle = 45°Number of Teeth = 23Pitch Diameter = ø11.5

View J

Section H-H

Section I-I


520L0935 · Rev AB · Jan 2009


39

+0.

03 0

4.5

3.5

122

6677.5

150

16

134

60

30

a b

80.5

4

6161

7878

5353

5353

B

A

7385

60

55 55


BDu-21LBDu-21H

ø47

±0.7

±1.0

±1.5

±1.0

+0° 40'

-2° 10'+0° 40'-2° 10'22° 22°

±0.5 ±0.5

±0.

07

±0.

18±

0.18

±0.18 ±0.18 ø90

Charge PumpSuction Port(Both Sides)9/16-18UNF-2BSAE Straight THD.O Ring BossW/OptionFilter

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

Drain Port3/4-16UNF-2BSAE Straight THD.O Ring Boss

4-ø8.5 THR

Option Code R L

Input Rotation



Output Rotation

as Seen From B DirectionCCW CW CW CCW

Byp

ass

valv

e C

lose

Byp

ass

valv

eO

pen

Charge PumpSuction PortIn case ofExternal filter

Charge PumpSuction Port3/4-16UNF-2BSAE Straight THD.O Ring BossIn case ofExternal filter

Charge PumpSuction Port9/16-18UNF-2BSAE Straight THD.O Ring BossIn case ofExternal filter

PlugforC&HPRVOnly for BDU-21H(Both Sides)

Bypass Valve

Mounting Holes

520L0935 · Rev AB · Jan 2009


40

0 -0.1

16 2

32

0 -0.1

5

915+0.8

0

9

+0.12 0

15-0

.006

-0.0

3015+0.8

0

97

E

E

E

E

97

0+0.12

-0.0

06-0

.030

32

54

-0.1

5 0

12

21.5 0-0.5

37


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

View E-E

Model Involute Spline20x14x1.25 class a

Tooth Profile = Short TeethModule = 1.25Pressure Angle = 20Number of Teeht = 14Pitch Diameter = 17.5Addendum Modification Coefficient = 0.8

φ

Model Involute Spline20x18x1.0 class a

Tooth Profile = Short TeethModule = 1.0Pressure Angle = 20Number of Teeht = 18Pitch Diameter = 18.0Addendum Modification Coefficient = 0.8

φShaft : JIS 20x18x1.0Option Code : J18

Shaft : JIS 20x14x1.25Option Code : J14

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

Motor Shaft

Model Involute SplineFillet Root Side FitSAE 1963 class 1Pitch Diameter = 17.643Pressure Angle = 30Number of Teeth = 22Spline Pitch = 32/64

φ

Continued

BDu-21LBDu-21H

ø6

±0.2

ø6

ø15

ø20

ø19

.75

ø20

ø19

.8

ø20

ø18

.263

±0.5


520L0935 · Rev AB · Jan 2009


41

7

R10

40 40

0 -0.0

36

18

G

35 0-0.5

F

F

65

25

15 0+0.518

0 -0.1 26 3

185

195

336

F

F

1639 39

R7

0 -0.0

36

10

12

0 -0.0

36

18

R7

40 40

H

H

26 3

185

0 -0.0

39

4.7 +0.25 0

5+

0.03

0

13.9

Continued

BDu-21LBDu-21H

PumpShaft:17mmStraightKeyed(KeyLength36mm)PTOShaft:NoneChargePump:3.1cc/rev(for21H)OptionCode:KC2

Shaft Configuration & Charge Pump Displacement for 21L & 21H

PumpShaft:17mmStraightKeyed(KeyLength36mm)PTOShaft:NoneChargePump:2.1cc/rev(for21L)OptionCode:KC1

PumpShaft:17mmStraightKeyed(KeyLength26mm)PTOShaft:InvoluteSplineJIS15x13x1.0ChargePump:2.1cc/rev(for21L)3.1cc/rev(for21H)OptionCode:PC1(2.1cc/rev) PC2(3.1cc/rev)

ø40

ø72 ø17

60°

±2.0

±2.0

ø17

60°

ø40

ø72

ø74

±2.0±2.0

±0.25

±0.1

ø15

ø14

.8

ø17

Section F-FView G-G

ø42

ø36

Model Involute SplineJIS 15x13x1.0 Class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 13Pitch Diameter = ø13.0Addendum Modification Coefficient = 0.8

520L0935 · Rev AB · Jan 2009


42

189

330

0 -0.1

65

25

18+0.5 0 15

F

F

40 40

R10

7

G

G

7

R10

40 40

F

F

15 0+0.518

22

62

26 3

185

5+

0.03

0

13.9

35 0-0.5

18

0 -0.0

36

4.7 +0.25 0

0 -0.0

39

35 0-0.5

15

0 -0.1

5

0 -0.0

36

Continued

BDu-21LBDu-21H

PumpShaft:17mmStraightKeyed(KeyLength30mm)PTOShaft:InvoluteSplineJIS15x13x1.0ChargePump:2.1cc/rev(for21L)3.1cc/rev(for21H)OptionCode:PC3(2.1cc/rev) PC4(3.1cc/rev)

Shaft Configuration & Charge Pump Displacement for 21L & 21H

PumpShaft:17mmStraightKeyed(KeyLength26mm)PTOShaft:InvoluteSplineSAE32/64-16TChargePump:2.1cc/rev(for21L)3.1cc/rev(for21H)OptionCode:PC5(2.1cc/rev) PC6(3.1cc/rev)

ø74

±0.1

ø15

±0.25

±2.0 ±2.0

ø17

ø42

ø36

ø17

±2.0±2.0

ø74

ø15

View G-GSection F-F

Model Involute SplineFillet Root Side FitSAE 1963 Class 1Pitch Diameter = ø12.7Pressure Angle = 30°Number of Teeth = 16Spline Pitch = 32/64

Model Involute SplineJIS 15x13x1.0 Class aTooth Profile = Short TeethModule = 1.0Pressure Angle = 20°Number of Teeth = 13Pitch Diameter = ø13.0Addendum Modification Coefficient = 0.8

ø14

.8ø

13.4

95

520L0935 · Rev AB · Jan 2009


43

L

CCW

A

0-1.5

+0.4-0.6

2.523

18.5

31.8

a b

B

BA

A

53.2

53.2

R46

M6 P1.0L:10 Min

11.0

CCW

-0.0

16-0

.036

5.00

+0.

03 0

1253.2

49.5

6.3

30 8

0 -0.0

5

25.4

25.4

68

19.05

9.5

22 22

6884

7.5

8650

607475

9.05

0 -0.1

5

58

-0.0

06-0

.024

+0.12 0

57.7

2222

131101

10

11.9

optional fan

BDP-10LInput Rotation CW CCW


Inlet Port “A” “B” “B” “A”

Outret Port “B” “A” “A” “B”

ø7.1

ø177.8

ø88.9

ø45.7

ø24

ø84

36°

(4 Places)

Optional Fan

Rotation Wind

±0.2

ø12

.00

ø10

.13

ø5.00

2- ø6.73 ±0.13

ø15

ø82

.55

ø95.25

±0.1

21° 21°

Section A-A

Section B-B

Port “A”

1

“A” Port3/4-16UNFSAE O Ring Boss

2

“B” Port3/4-16UNFSAE O Ring Boss

Bypass Valve Full Open at“1” RevolutionClosing Torque

5

“A” Gage Port9/16-18UNFSAE O Ring Boss

4

Charge Pump Inlet7/16-20UNFSAE O Ring Boss

6

“B” Gage Port9/16-18UNFSAE O Ring Boss

3

Case Drain Port7/16-20UNFSAE O Ring Boss

Port “B”

10 Places

www.sauer-danfoss.com520L0935 · Rev AB · Jan 2009

Sauer-Danfoss (US)Company2800 East 13th StreetAmes,IA 50010,USAPhone:+1515239-6000Fax:+15152396618

Sauer-DanfossGmbH&Co.OHGPostfach 2460,D-24531 NeumunsterKrokamp 35,D-24539 Neumunster,GermanyPhone:+494321871-0Fax:+494321871122

Sauer-Danfoss ApSDK-6430 Nordborg,DenmarkPhone:+4574884444Fax:+4574884400

Sauer-Danfoss-Daikin LTDSannomiya Grand Bldg.8F2-2-21 Isogami-dori,Chuo-kuKobe,Hyogo 651-0086,JapanPhone:+81782315001Fax:+81782315004

Localaddress:

saueR-Danfoss moBiLe PoWeR anD ContRoL systems– maRket LeaDeRs WoRLDWiDe

Sauer-Danfoss is a comprehensive supplier providing complete systems to the global mobile market.

Sauer-Danfoss serves markets such as agriculture, construction, road building, material handling, municipal, forestry, turf care, and many others.

Weofferourcustomersoptimumsolutionsfortheirneedsanddevelop new products and systems in close cooperation and partner ship with them.

Sauer-Danfoss specializes in integrating a full range of system components to provide vehicle designers with the most advanced total system design.

Sauer-Danfoss provides comprehensive worldwide service for its products through an extensive network of Global Service Partners strategically located in all parts of the world.

our Products

Open circuit axial piston pumps

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PLUS+1™ GUIDE

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