Section E - Hydraulics
Operation Description
Transmission Operation - 4WD Series 2 Machines
E-31 E-31
9803-9340-8
Transmission Operation - 4WD Series 2 Machines
Neutral
K Fig 26. ( T E-32)
With the engine running, charge pump 8 draws oil through
the suction strainer S and feeds the oil into the
transmission circuit to provide control pressure for the
pump operation. The supply and pressure of oil is
controlled by charge valve 7. Charge pressure is also fed,
via port G, to the motor series lines via the series line and
hose protection valves 11a and 11b, to ensure the motor
circuits are filled with oil, and to brake valve 12 to release
the motor brakes.
Excess charge oil from the pump and leakage oil from the
motors is returned via cooler C to the tank T.
As the pump swash plate is in the neutral position there is
no delivery from the pump and the machine remains
stationary.
The machine is prevented from moving by oil locked up in
the pump/motor circuit.
Key
C Cooler
P1 Transmission Pump
M1 Motor
M2 Motor
M3 Motor
M4 Motor Shuttle Valve
S Suction strainer
T Tank
2 Swash Control Piston
3 Direction Control Valve
4 Pressure Cut-off Valve
5a High Pressure Relief Valve
5b High Pressure Relief Valve
6 Displacement Angle Control Valve
6a Inching Pedal Connection
7 Charge Pressure Relief Valve
8 Charge Pump
10 Variable Displacement Pump
11a Series Line & Hose Protection Valve
11b Series Line & Hose Protection Valve
12 Brake Valve
13 Hydraclamp Valve
14 Porting Block
14a
Purge Valve
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