Gradall 534B (9020-7317) Service Manual - Manual (Page 86)

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 also routed to
Fwd/Rev Control Valve. Oil from the end section is
routed to the main control valve. Both circuits have
3000 psi relief valves.
The rear drive pump relief valve is located inside the
frame on the left side. The other relief valve is
located within the Main Control Valve. The main
control valve is located under the operator’s seat.
GRADALL LOED MATERIALS HANDLER 534B SYSTEM OPERATION
10
PILOT PUMP CIRCUIT
The pilot pump supplies oil for the brake booster
circuit’ the parallel solenoid valve, the series
solenoid valve, the Fwd/Rev pilot pressure control
valve, and the low torque inching solenoid valve.