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
Transmission Operation - Forward
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
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