Hydrostatic Drive System
25
Service Training MALAGA TRACK TYPE LOADERS Francis July 1997 HYDROSTATIC DRIVE SYSTEM
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Transcript of Hydrostatic Drive System
Service TrainingMALAGA
TRACK TYPE LOADERS
FrancisJuly 1997
HYDROSTATIC DRIVE SYSTEM
2Page:
TRACK-TYPE LOADERSHYDROSTATIC DRIVE SYSTEM
AUDIENCE
Level II – Service personnel who understand the principles of machine systems operation, diagnosticequipment, and procedures for testing and adjusting.
CONTENT
The information contained within this package deals with the 943 through the 973 Track-type Loaders.Changes have occurred since the release of STMG 493 plus the addition of the 953B model warrant thisSTMG on the hydrostatic transmission.
OBJECTIVES
After learning the information in this presentation, the serviceman will be able to:
1. locate and identify all major transmission components;
2. identify pressure tap locations and explain the purpose of each pressure test;
3. trace the flow of oil through the drive system during the different system conditions; and
4. explain the operation of each component in the transmission systems.
REFERENCES
953B Track-type Loader Service Manual SENR5270963 Track-type Loader Service Manual SENR2280973 Track-type Loader Service Manual SENR2454953B Track-type Loader Parts Book SEBP2170963 Track-type Loader Parts Book HEBP1366973 Track-type Loader Parts Book HEBP1386953B Track-type Loader (Advertising Literature) AEHQ3606
PREREQUISITES
STMG 493 "Hydrostatic Drive System for Track Loaders" SESV1493
CHAPTER : Introduction
TRACK TYPE LOADERS
3Page:
SUPPLEMENTARY TRAINING MATERIAL
Service Magazine "Troubleshooting, Service Tips, And Major Improvements ForHydrostatic Transmissions" December 5, 1984 SEBD1487Service Magazine Article "Service Replacement Parts for Replenishing Valve on HydrostaticTransmission" May 3, 1993 SEPD0152Service Magazine Article "Improved Filtration of Hydrostatic Transmission Filters"January 20, 1992 SEPD0097Schematic - 953B Track-type Loader Power Train SENR5276Schematic - 943, 953, 963 Track-type Loader Power Train SENR3034Schematic - 973 Track-type Loader Power Train SENR3079Video Tape "Hydrostatic Loader Troubleshooting I - Learning The Seven Systems" SEVN9185Video Tape "Hydrostatic Loader Troubleshooting II - Analyzing The Data Sheet" SEVN9186Slide Presentation - 1.1 Liter Engine Family LESV0556Video Tapes - 3100 Series Engines (11 tape set) LEKV8596
CHAPTER : Introduction
TRACK TYPE LOADERS
4Page:
POWER TRAIN COMPONENTS
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
VARIABLEDISPLACEMENT
PUMP
HYDRAULICLINES
FIXEDDISPLACEMENT
MOTOR
BASIC DRIVE SYSTEM
5P
age:
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
CHARGEPUMP
CHARGERELIEFVALVE
COOLER
VARIABLEDISPLACEMENT
PUMP
FIXEDDISPLACEMENT
MOTOR
BASIC DRIVE SYSTEMWITH CHARGE CIRCUIT AND COOLER
CHARGE ANDMAIN RELIEF
VALVE
MAIN RELIEF VALVE
6P
age:
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
UNDERSPEEDVALVE
OPERATORINPUT
ENGINE SPEED
SERVOVALVE
CHARGEPUMP
CHARGERELIEFVALVE
COOLER
VARIABLEDISPLACEMENT
PUMP
FIXEDDISPLACEMENT
MOTOR
BASIC DRIVE SYSTEMWITH UNDERSPEED AND SERVO VALVES
MAIN RELIEF VALVE
CHARGE ANDMAIN RELIEF
VALVE
7P
age:
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
UNDERSPEEDVALVE
OPERATORINPUT
ENGINE SPEED
SERVOVALVE
CHARGEPUMP
CHARGERELIEFVALVE
COOLER
VARIABLEDISPLACEMENT
PUMP
FIXEDDISPLACEMENT
MOTOR
BASIC DRIVE SYSTEMBOTH DRIVE LOOPS
MAIN RELIEF VALVE
SERVOVALVE
VARIABLEDISPLACEMENT
PUMP
FIXEDDISPLACEMENT
MOTOR
CHARGE ANDMAIN RELIEF
VALVE
MAIN RELIEFVALVE
CHARGE ANDMAIN RELIEF
VALVE
8P
age:
9Page:
ROTATING GRTOUP
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
10Page:
PUMP GROPUP
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
11Page:
HYDROSTATIC TRANSMISSION
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
COMPONENTS
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
PARK
FILTER
FILTERRELIEFVALVE
CHARGEPUMP
SCREEN
VENTURI
UNDERSPEEDCUT-IN SCREW
START/VENT SPOOL
DIRECT
QUICK RESPONSEVALVE
VENTURI THROAT ORIFICE
CHARGE PUMP AND FILTER SYSTEM
MAXIMUMREVERSE
MAXIMUMFORWARD
12P
age:
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
BR
AK
ES
OF
FF
OR
WA
RD
RE
VE
RS
EB
RA
KE
S O
FF
PARK
FILTER
FILTERRELIEFVALVE
CHARGEPUMP
SCREEN
VENTURI UNDERSPEEDCUT-IN SCREW
PILOT VALVE
START/VENT SPOOL
CHARGE PRESSURECHECK VALVE
SPEED/BRAKESPOOL
SERVO RELIEFVALVE
UNDERSPEEDOVERRIDE
VALVE
UNDERSPEEDVALVE
DIRECTION/SPEEDLINK
OVERSPEEDVALVE
QUICK RESPONSEVALVE
VENTURITHROAT ORIFICE
UNDERSPEED AND OVERSPEED SYSTEM
MAXIMUMREVERSE
MAXIMUMFORWARD
TO BRAKES
13P
age:
14Page:
UNDERSPEED VALVE
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
15Page:
UNDERSPEED VALVE
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
COMPONENTS
16Page:
UNDERSPEED VALVE
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
FRONT VIEW
17Page:
SPEED/DIRECTION CONTROL LEVER
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
IN BRAKE OFF POSITION
18Page:
UNDERSPEED VALVE
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
IN BRAKE OFF POSITION
19Page:
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
SPEED/DIRECTION CONTROL LEVER
MAXIMUM FORWARD POSITION
20Page:
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
UNDERSPEED VALVE
MAXIMUM FORWARD POSITION
CH
AP
TE
R : H
YD
RO
STA
TIC
DR
IVE
SY
ST
EM
TR
AC
K T
YP
E L
OA
DE
RS
BR
AK
ES
OF
FF
OR
WA
RD
RE
VE
RS
EB
RA
KE
S O
FF
BR
AK
ES
ON
PARK
FILTER
FILTERRELIEFVALVE
CHARGEPUMP
SCREEN
VENTURI UNDERSPEEDCUT-IN SCREW
PILOT VALVE
ORIFICE TOPILOT VALVE
OPERATE/BRAKE SPOOL
START/VENT SPOOL
CHARGE PRESSURECHECK VALVE
SPEED/BRAKESPOOL
QUICK RESPONSEVALVE
VENTURITHROAT ORIFICE
OPERATE/BRAKE SPOOL SYSTEM
MAXIMUMREVERSE
MAXIMUMFORWARD
TO BRAKES
21P
age:
22Page:
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
LEFT SERVO CYLINDER
RIGHT SERVO CYLINDER
LEFT DRIVE PUMP
LEFT DRIVE PUMPLUBE SCREEN
RIGHT DRIVE PUMP
RIGHT DRIVE PUMP LUBE SCREEN
SERVO RELIEFVALVE
SERVO CONTROL SYSTEM
NEUTRAL SCREW
SERVO VALVE
SERVO VALVE
CENTERING LINK
SYNC SCREW
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
TO
BR
AK
ES
LEF
TT
RA
CK
MO
TO
R
RIG
HT
TR
AC
KM
OT
OR
CO
OLE
R
RIG
HT
CH
AR
GE
AN
D M
AIN
RE
LIE
F V
ALV
E
LEF
T C
HA
RG
E A
ND
MA
IN R
ELI
EF
VA
LVE
SH
UT
TLE
SP
OO
L
SH
UT
TLE
SP
OO
L
TO
WIN
G P
LUG
TO
WIN
GP
LUG
MA
INR
ELI
EF
VA
LVE
MA
INR
ELI
EF
VA
LVE
SY
NC
VA
LVE
SY
NC
CU
TO
FF
VA
LVE
CH
AR
GE
PR
ES
SU
RE
RE
LIE
F V
ALV
E
CO
OLE
RB
YP
AS
SV
ALV
E
LEF
T S
ER
VO
CY
LIN
DE
R
RIG
HT
SE
RV
O C
YLI
ND
ER
LEF
TD
RIV
E P
UM
P
LEF
T D
RIV
E P
UM
PLU
BE
SC
RE
EN
RIG
HT
DR
IVE
PU
MP
RIG
HT
DR
IVE
PU
MP
LUB
E S
CR
EE
N
OIL
CO
OLE
RR
ET
UR
N S
CR
EE
N
PIS
TO
N P
UM
PS
, MO
TO
RS
AN
D R
ELI
EF
SY
ST
EM
NE
UT
RA
LS
CR
EW
SE
RV
O V
ALV
E
SE
RV
O V
ALV
E
CE
NT
ER
ING
LIN
K
SY
NC
SC
RE
W
23Page:
24Page:
SERVO VALVE
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
ILLUSTRATION
25Page:
CHAPTER : HYDROSTATIC DRIVE SYSTEM
TRACK TYPE LOADERS
LEFTTRACKMOTOR
RIGHTTRACKMOTOR
COOLER
SHUTTLESPOOL
SHUTTLESPOOL
TOWING PLUG
TOWINGPLUG
SYNC VALVE
SYNCCUTOFF VALVE
CHARGE PRESSURERELIEF VALVE
COOLERBYPASSVALVE
OIL COOLERRETURN SCREEN
TRANSMISSIONOIL COOLER SYSTEM
