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Curso Cat 950-962G Steering Syst STMG
24
Service Training MALAGA STEERING SYSTEM 950G/962G MEDIUM WHEEL LOADERS Francis March 1998
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Transcript of Curso Cat 950-962G Steering Syst STMG
Service TrainingMALAGA
STEERING SYSTEM
950G/962G MEDIUMWHEEL LOADERS
FrancisMarch 1998
2Page:
HY
DR
AU
LIC
TA
NK
HA
ND
ME
TE
RIN
G U
NIT
ST
EE
RIN
GC
ON
TR
OL
VA
LVE
NE
UT
RA
LIZ
ER
VA
LVE
S
ST
EE
RIN
GC
YLI
ND
ER
SE
CO
ND
AR
Y S
TE
ER
ING
PU
MP
AN
D M
OT
OR
SE
CO
ND
AR
YS
TE
ER
ING
VA
LVE
ST
EE
RIN
GP
UM
P
PIL
OT
SY
ST
EM
MA
IN S
YS
TE
M
SE
CO
ND
AR
Y S
YS
TE
M
CO
MM
ON
TO
ALL
SY
ST
EM
S
ST
EE
RIN
G S
YS
TE
M C
OM
PO
NE
NT
S
CHAPTER : STEERING SYSTEM
950G/962G MWL
3Page:
1
4 3
52
CHAPTER : STEERING SYSTEM
950G/962G MWL
1. HMU. 2. Signal Hose3. Signal Pressure Port4 Brake Valve5. Accelerator Pedal Cable
COMPONENTS IDENTIFICATION
4Page:
ST
EE
RIN
G S
YS
TE
MH
OLD
ST
EE
RIN
GC
ON
TR
OL
VA
LVE
SE
CO
ND
AR
YS
TE
ER
ING
PU
MP
AN
D M
OT
OR
SE
CO
ND
AR
YS
TE
ER
ING
VA
LVE
NE
UT
RA
LIZ
ER
VA
LVE
NE
UT
RA
LIZ
ER
VA
LVE
HA
ND
ME
TE
RIN
GU
NIT
CH
EC
K V
ALV
E
PU
MP
TA
NK
ST
EE
RIN
GC
YLI
ND
ER
S
CHAPTER : STEERING SYSTEM
950G/962G MWL
5Page:
18
6
3
29
5
47
CHAPTER : STEERING SYSTEM
950G/962G MWL
STEERING CONTROL VALVE
1. Steering Control Valve2.Left Turn Hose3.Back-Up Relief Valve4.Return Hose5.Supply Hose
6.Drain Hose7.Pressure Port Line8.Supply Hose9.Right Turn Hose
6Page:
CHAPTER : STEERING SYSTEM
950G/962G MWL
7Page:
ST
EE
RIN
GC
YLI
ND
ER
S
ST
EE
RIN
G H
YD
RA
ULI
C S
YS
TE
M
ST
EE
RIN
G P
UM
P
PIL
OT
CO
NT
RO
LV
ALV
E
TA
NK
FR
OM
IMP
LEM
EN
TP
ILO
T S
UP
PLY
SC
RE
EN
CO
NT
RO
LV
ALV
E
SH
UT
TLE
VA
LVE
DO
UB
LEC
HE
CK
VA
LVE
DO
UB
LEC
HE
CK
VA
LVE
CHAPTER : STEERING SYSTEM
950G/962G MWL
8Page:
PIL
OT
CO
NT
RO
LV
ALV
E
DO
UB
LEC
HE
CK
VA
LVE
FR
OM
IMP
LEM
EN
TP
ILO
T S
YS
TE
M
PR
ES
SU
RE
RE
DU
CIN
GV
ALV
E
SH
UT
TLE
VA
LVE
MA
KE
UP
BA
LLC
HE
CK
VA
LVE
SC
YLI
ND
ER
CR
OS
SO
VE
RR
ELI
EF
VA
LVE
ST
EE
RIN
G C
ON
TR
OL
VA
LVE
ST
EE
RIN
GC
YLI
ND
ER
S
TO
IMP
LEM
EN
TP
ILO
TA
ND
BR
AK
E S
YS
TE
M
CO
NT
RO
L S
PO
OL
DO
UB
LEC
HE
CK
VA
LVE
PU
MP
BA
CK
-UP
RE
LIE
FV
ALV
E
SH
UT
TLE
VA
LVE
ST
EE
RIN
G H
YD
RA
ULI
C S
YS
TE
MH
OLD
ST
EE
RIN
G
PU
MP
PIL
OT
/ B
RA
KE
PU
MP
TO
IMP
LEM
EN
T
FR
OM
PIL
OT
R
ET
UR
NIM
PLE
ME
NT
P
UM
P
CHAPTER : STEERING SYSTEM
950G/962G MWL
9Page:
STEERING PILOT CONTROL VALVE
CHAPTER : STEERING SYSTEM
950G/962G MWL
10Page:
STEERING PILOT CONTROL VALVE
(Engine running)
CHAPTER : STEERING SYSTEM
950G/962G MWL
11Page:
STEERING PILOT COTROL VALVE
(In process)
CHAPTER : STEERING SYSTEM
950G/962G MWL
12Page:
OUTPUT PRESSURE VS INPUT POSITION
OU
TP
UT
DI F
F P
RE
SS
UR
E
"ZERO" INPUT POSITION
1800 kPa
1600 kPaMINIMUM
02 1+- 2 1+-35- 35
0 kPa
(CCW DEGREES) (CW DEGREES)
550 +/ -10 kPa
CHAPTER : STEERING SYSTEM
950G/962G MWL
13Page:
SIG
NA
L P
AS
SA
GE
PU
MP
OU
TP
UT
LAR
GE
AC
TU
AT
OR
YO
KE
PA
D
SW
AS
HP
LAT
E
DR
IVE
SH
AF
T
SM
ALL
AC
TU
AT
OR
AN
D B
IAS
SP
RIN
G
PIS
TO
N A
ND
BA
RR
EL
AS
SE
MB
LY
PR
ES
SU
RE
CO
MP
EN
SA
TO
R(P
RE
SS
UR
E C
UT
OF
F)
FLO
W C
OM
PE
NS
AT
OR
(MA
RG
IN S
PO
OL)
PU
MP
AN
D C
OM
PE
NS
AT
OR
OP
ER
AT
ION
EN
GIN
E O
FF
CHAPTER : STEERING SYSTEM
950G/962G MWL
14Page:
PU
MP
AN
D C
OM
PE
NS
AT
OR
OP
ER
AT
ION
LOW
PR
ES
SU
RE
ST
AN
DB
Y
SW
AS
HP
LAT
E
YO
KE
PA
DLA
RG
E A
CT
UA
TO
R
PU
MP
OU
TP
UT
SIG
NA
L P
AS
SA
GE
FLO
W C
OM
PE
NS
AT
OR
(MA
RG
IN S
PO
OL)
PR
ES
SU
RE
CO
MP
EN
SA
TO
R(P
RE
SS
UR
E C
UT
OF
F)
SM
ALL
AC
TU
AT
OR
AN
D B
IAS
SP
RIN
GP
IST
ON
AN
DB
AR
RE
L A
SS
EM
BLY
DR
IVE
SH
AF
T
CHAPTER : STEERING SYSTEM
950G/962G MWL
15Page:
PU
MP
OU
TP
UT
SIG
NA
L
RE
DU
CE
D P
RE
SS
UR
ELA
RG
E A
CT
UA
TO
R
SM
ALL
AC
TU
AT
OR
AN
D B
IAS
SP
RIN
G
SW
AS
HP
LAT
E
DR
IVE
SH
AF
T
YO
KE
PA
D
PR
ES
SU
RE
CO
MP
EN
SA
TO
R(P
RE
SS
UR
E C
UT
OF
F)
FLO
W C
OM
PE
NS
AT
OR
(MA
RG
IN S
PO
OL)
PIS
TO
N A
ND
BA
RR
EL
AS
SE
MB
LY
PU
MP
AN
D C
OM
PE
NS
AT
OR
OP
ER
AT
ION
UP
ST
RO
KIN
G
CHAPTER : STEERING SYSTEM
950G/962G MWL
16Page:
PU
MP
OU
TP
UT
SIG
NA
L
LAR
GE
AC
TU
AT
OR
SM
ALL
AC
TU
AT
OR
AN
D B
IAS
SP
RIN
G
SW
AS
HP
LAT
E
DR
IVE
SH
AF
T
YO
KE
PA
D
PR
ES
SU
RE
CO
MP
EN
SA
TO
R(P
RE
SS
UR
E C
UT
OF
F)
FLO
W C
OM
PE
NS
AT
OR
(MA
RG
IN S
PO
OL)
PIS
TO
N A
ND
BA
RR
EL
AS
SE
MB
LY
PU
MP
AN
D C
OM
PE
NS
AT
OR
OP
ER
AT
ION
DE
ST
RO
KIN
G
CHAPTER : STEERING SYSTEM
950G/962G MWL
17Page:
PU
MP
OU
TP
UT
AT
MA
X. P
RE
SS
UR
ES
IGN
AL
AT
MA
X. P
RE
SS
UR
E
LAR
GE
AC
TU
AT
OR
SM
ALL
AC
TU
AT
OR
AN
D B
IAS
SP
RIN
G
SW
AS
HP
LAT
E
DR
IVE
SH
AF
T
YO
KE
PA
D
PR
ES
SU
RE
CO
MP
EN
SA
TO
R(P
RE
SS
UR
E C
UT
OF
F)
FLO
W C
OM
PE
NS
AT
OR
(MA
RG
IN S
PO
OL)
PIS
TO
N A
ND
BA
RR
EL
AS
SE
MB
LY
PU
MP
AN
D C
OM
PE
NS
AT
OR
OP
ER
AT
ION
HIG
H P
RE
SS
UR
E S
TA
LL
CHAPTER : STEERING SYSTEM
950G/962G MWL
18Page:
TO
IMP
LEM
EN
T
34
50
kP
a
AN
D
PIL
OT
CO
NT
RO
LV
ALV
E
FR
OM
IMP
LEM
EN
TP
ILO
T S
YS
TE
M
TO
SH
UT
TLE
VA
LVE
PIL
OT
/ B
RA
KE
PU
MP
FR
OM
PIL
OT
R
ET
UR
NIM
PLE
ME
NT
P
UM
P
IMP
LEM
EN
T R
ET
UR
N
13
8 k
Pa
- 2
kP
a
37
l/m
in
29
2 l/
min
15
8 l/
min
1 m
/m
20
70
kP
a
23
50
0 k
Pa
25
60
0 k
Pa
DO
UB
LEC
HE
CK
VA
LVE
PR
ES
SU
RE
RE
DU
CIN
GV
ALV
E
SH
UT
TLE
VA
LVE
MA
KE
UP
BA
LLC
HE
CK
VA
LVE
SC
YLI
ND
ER
CR
OS
SO
VE
RR
ELI
EF
VA
LVE
ST
EE
RIN
G C
ON
TR
OL
VA
LVE
ST
EE
RIN
GC
YLI
ND
ER
S
IMP
LEM
EN
T
BR
AK
E S
YS
TE
M
CO
NT
RO
L S
PO
OL
DO
UB
LEC
HE
CK
VA
LVE
ST
EE
RIN
G
PU
MP
PU
MP
BA
CK
-UP
RE
LIE
FV
ALV
E
ST
EE
RIN
G H
YD
RA
ULI
C S
YS
TE
MR
IGH
TU
RN
PIL
OT
CHAPTER : STEERING SYSTEM
950G/962G MWL
19Page:
DO
UB
LEC
HE
CK
VA
LVE
PR
ES
SU
RE
RE
DU
CIN
GV
ALV
E
SH
UT
TLE
VA
LVE
MA
KE
UP
BA
LLC
HE
CK
VA
LVE
SC
YLI
ND
ER
CR
OS
SO
VE
RR
ELI
EF
VA
LVE
ST
EE
RIN
G C
ON
TR
OL
VA
LVE
ST
EE
RIN
GC
YLI
ND
ER
S
CO
NT
RO
L S
PO
OL
DO
UB
LEC
HE
CK
VA
LVE
ST
EE
RIN
G
PU
MP
PU
MP
BA
CK
-UP
RE
LIE
FV
ALV
E
ST
EE
RIN
G H
YD
RA
ULI
C S
YS
TE
MS
UP
PLE
ME
NT
AL
ST
EE
R -
LEF
T T
UR
N E
NG
INE
OF
F
PIL
OT
/ B
RA
KE
PU
MP
TO
IMP
LEM
EN
T
FR
OM
PIL
OT
R
ET
UR
NIM
PLE
ME
NT
P
UM
P
IMP
LEM
EN
T R
ET
UR
N
13
8 k
Pa
-
2 k
Pa
37
l/m
in
29
2 l
/min
15
8 l
/min
1 m
/m
20
70
kP
a
23
50
0 k
Pa
25
60
0 k
Pa
IMP
LEM
EN
TA
ND
BR
AK
E S
YS
TE
M
TO
PIL
OT
34
50
kP
aP
ILO
T C
ON
TR
OL
VA
LVE
FR
OM
IMP
LEM
EN
TP
ILO
T S
YS
TE
M
SH
UT
TLE
VA
LVE
65
00
kP
a
SE
CO
ND
AR
Y
ST
EE
R3
2 l
/min
12
00
kP
a
70
0 k
Pa
CHAPTER : STEERING SYSTEM
950G/962G MWL
20Page:
3
4
5
1
2
CHAPTER : STEERING SYSTEM
950G/962G MWL
FAN DRIVE SYSTEM
1. Fan Motor Intake Hose2. Hydraulic Fan Motor3. Fan4. Return Hose5. Drain Hose
21Page:
TO
IMP
LEM
EN
TH
YD
RA
ULI
CS
YS
TE
M
FA
N D
RIV
E S
YS
TE
ME
NG
INE
ON
FA
N
FA
NM
OT
OR
O
IL C
OO
LER
BY
-PA
SS
VA
LVE
OIL
CO
OLE
R
TA
NK
PIL
OT
/B
RA
KE
PU
MP
IMP
LEM
EN
T
PU
MP
ST
EE
R P
UM
P
MA
KE
UP
VA
LVE
RE
LIE
F V
ALV
E
FIL
TE
R
42 l/
min
450
kPa
170
kPa
(138
5 rp
m)
1700
0 kP
a
CHAPTER : STEERING SYSTEM
950G/962G MWL
22Page:
TO
IMP
LEM
EN
TH
YD
RA
ULI
CS
YS
TE
M
FA
N D
RIV
E S
YS
TE
ME
NG
INE
OF
F
FA
N
FA
NM
OT
OR
O
IL C
OO
LER
BY
-PA
SS
VA
LVE
OIL
CO
OLE
R
TA
NK
MA
KE
UP
VA
LVE
RE
LIE
F V
ALV
E
FIL
TE
R
FA
NP
UM
P
PIL
OT
/B
RA
KE
PU
MP
IMP
LEM
EN
T
PU
MP
ST
EE
R P
UM
P
42 l/
min
450
kPa
170
kPa
(138
5 rp
m)
1700
0 kP
a
CHAPTER : STEERING SYSTEM
950G/962G MWL
23Page:
PILOT SIGNALPRESSURE ADJ
INPUTSHAFT
FROM IMPLEMENTPILOT SYSTEM
CONTROL SPOOL
REDUCED PILOT SIGNAL PRESSURE TEST PORT
PILOT SIGNAL PRESSURE TEST PORT
STEERING PILOTCONTROL VALVE
CHAPTER : STEERING SYSTEM
950G/962G MWL
STEERING PRESSURE TEST PORT
24Page:
STEERING SYSTEM
MARGIN PRESSURE ADJUSTMENT
1. Install the steering frame lock link so the machine can not turn.
2. Using the load sensing signal pressure tap and the pump outlet pressure tap, install the Pressure Differential Gauge (1U5796). Connect a 60000 kPa pressure gauge in the differential pressure gauge, pump outlet side.
3. Loosen jam nut on the crossover line relief valve, and turn adjuster screw three full turns counterclockwise.
4. Start the engine , allow the hydraulic oil to reach normal operating temperature.
5. While operating at the high idle, turn slowly the steering wheel against the frame link lock until the pressure gauge installed on the pump outlet pressure tap shows 20000 kPa approximately. Then slowly unturn the steering wheel so that the pressure gradually decreases.
7. Between 20000 kPa and 12000 kPa approximately, the Margin pressure should remain constant at 2400 +/- 150 kPa
8. If the reading is not with in specs, screw in or out the Margin pressure adjustment screw.
MARGIN PRESSURE \ADJUSTMENT SCREW
PRESSURECOMPENSATOR
(PRESSURE CUTOFF)
FLOW COMPENSATOR(MARGIN SPOOL)
PUMPOUTPUT
SIGNALPRESSURE AP
PUMP OUTPUTPRESSURE TAP
DIFFERENTIALPRESSURE GROUP
1U5796
CHAPTER : STEERING SYSTEM
950G/962G MWL
