Section E - Hydraulics
Operation Description
Servo Transmission Operation
E - 18 E - 18
9803-9450-2
Reverse
K Fig 15. ( T E-18)
When the joystick 12 is moved to select reverse, drive
spool 12c is operated allowing oil from pump P4 to pass
via shuttle valves 12e to the swash plate servos on pumps
P1 and P2. The swash plates are tilted causing flow to
pass to the motors M1 and M2 and the machine moves
backwards.
Pressure is also fed to the motor shuttle valves M1a and
M2a causing them to move up and connect the motor relief
valves to the return side of the loop circuits.
Return oil from the motors flows back into the transmission
pumps. Any excess oil from the pump casing is fed back to
tank T.
Shuttle valves 12e prevent servo pressure from being fed
into other servo circuits.
Fig 15.
P
FWD
LEFT
T
D
REV
BRAKE
VALVE
4
REV
BUCKET RAM
BORE DIA 90
ROD DIA 40
T
LIFT RAM
BORE DIA 75
ROD DIA 50
SAUER SUNSTRAND 42-41
TANDEM HYD SERVO DISPLACEMENT CONTROL
TRANSMISSION PUMP
0.041 L/REV
FWD
OIL COOLER
385 BAR
385 BAR
385 BAR
385 BAR
SUCTION
STRAINER
125 MICRON
RIGHT
T
C
SUCTION 2" TUBE
HPCO
AUX DRIPLESS FLAT
FACED COUPLINGS
ENGINE
71 L/MIN
P
SERVO CONTROL VALVE
1
TP
SERVO CONTROL VALVE
DF
REV
C
P
A
FWD
B
FLOAT VALVE
TP
T
2
C
E
B
3
D
EMERGENCY LOWER
VALVE
A
A
B
M5 M4
M4
M5
F
SP1
24 BAR
M4
M5
REAR PUMP
SERVO CUTOFF
VALVE
FRONT PUMP
SP2
JOYSTICK
CONNECTIONS
SP3
PLAN VIEW PUMP
M5
E
LHS N/S
RHS O/S
M4
SP4
JOYSTICK PORT 1 TO VALVE PORT B1
JOYSTICK PORT 2 TO VALVE PORT B2
JOYSTICK PORT 3 TO VALVE PORT A1
JOYSTICK PORT 4 TO VALVE PORT A2
CROWD (JOYSTICK IN)
TIP (JOYSTICK OUT)
LIFT (JOYSTICK BACK)
LOWER
JOYSTICK FWD)
A
C
FILTER
D
PARALLEL
LIFT
VALVE.
2 BAR CHECK
VALVE
12 CC/REV
X 1:0.85 RATIO
2800 RPM = 34 L/MIN
21.3 CC/REV
@ 2800 RPM
= 60 L/MIN
25.4 CC/REV
@ 2800 RPM
= 71 L/MIN
TP
T
P
2
P
1
D
P1
P2
TP
DUMP
VALVE
DRIVE MOTOR
DRIVE MOTORTRANSMISSION PUMP
LOADER
NOTE:
NOT REQUIRED
WITH FLOAT VALVE
LOADER VALVE
P
T
CHARGE
FILTER
A
B
C
P2
T3
B1 P2
B1
T3
AUX OPP VALVE
131 L/MIN
HF VALVE
ATTACHMENT
0.5 BAR
CHECK VALVE
ACCUMULATOR
5 BAR 24CC
B2
B3
B1
A3
A2
A1
P
1
2
3
4
5
6
7
8
9
9a
9b
9c 9d
9f
10
11
12
12a
12b
12c
12e
12d
14
X2
F1
15
16
17
19
19a
19b
20
T
C
F2
P3
P5
P4
M1
M1a
M2
M2a
S
T
X1
Z
13
13b
13c
13a
13d
P1
P2
To Next Page
Loading...
