Gradall 534B (9103-1390) Service Manual - Manual (Page 53)

MAIN PUMP CIRCUITS
The two section main tandem pump supplies oil for
two separate circuits. Oil from the base section
supplies oil through a Priority valve (to assure a
supply of oil for steering) and on to the Fwd/Rev
Control valve in the rear wheel drive circuits. This
circuit is covered by 3000 psi relief valves located in
the Fwd/Rev valve.
Oil from the end section of the pump is routed to the
main control valve and on to the outrigger control
valve. The main control valve contains a 3000 psi
relief valve.
PILOT PUMP CIRCUIT
The pilot pump supplies oil for the brake circuit, the
parallel solenoid valve, the series solenoid valve, the
Fwd/Rev pilot pressure control valve, and the low
torque inching solenoid valve.
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