jcb 1CX, Service Manual

Page: 131 / 242

10 - 4
Section E Hydraulics
9803/8550
Section E
10 - 4
Issue 4
Descriptions
2
Loader Valve
2X
Pressure Test Point
2Y
Pressure Test Point
3
Check Valve (5 bar)
4
Excavator Valve
8
Drive Control Joystick
8a
Joystick Control Spool
8b
Joystick Control Spool
8c
Joystick Control Spool
8d
Joystick Control Spool
8e
Shuttle Valves
9
Pressure Reducing Solenoid Valve
11
Filter By-pass Valve
T
ransmission Operation - Forwar
d
When the joystick
8
is moved to select forward
drive spool
8b
is operated allowing oil from pump
P3
to pass via shuttle valves
8e
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 forward.
Return oil from the motors flows back into the main pumps. Any excess oil from the pump casing is fed back to tank via cooler
C
.
Shuttle valves
8e
prevent servo pressure from
being fed into other servo circuits.
Key C
Cooler
F1
Filter
P1
Main Pump
P2
Main Pump
P3
Auxiliary Gear Pump
Pa
Charge Valve
Pb
Pressure Relief Valve
Pc
Pressure Relief Valve
Pd
Pressure Relief Valve
Pe
Pressure Relief Valve
M1
Left Hand Drive Motor
M2
Right Hand Drive Motor
S1
Suction Strainer
T
Tank
M1
P1
P2
M2
P3
8
T
S1
C
2X
F1
2Y
11
2
Pa
Pb
Pc
Pd
Pe
8a
8b
8c
8d
8e
xy
9
z
4
3
A242330
*
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