Service Manual User Manual

HOW TO TEST AND ADJUST
PILOT PUMP RELIEF VALVE
1.
2.
3.
4.
5.
6.
7.
The circuit relief for the steering circuit is located in
the priority flow divider valve.
1.
2.
3.
GRADALL
LOED MATERIALS HANDLER 534B TESTING AND ADJUSTING
Remove the one end of the hose (at Pilot
Pressure Control Valve) that comes from the
pressure side of the Pilot Pump.
Install 1000 psi gage in end of this hose.
Start engine and run at idle rpm.
The pilot pressure should read 500 psi.
If adjustment is needed, remove line in relief
valve (located near pilot pump), and raise or
lower pressure to reach 500 psi. Use a 5/16" allen
wrench to adjust this valve.
If adjustment cannot be made, replace relief
valve.
Replace hoses and remove gage.
TESTING AND ADJUSTING THE
STEERING CIRCUIT RELIEF VALVE
If the adjustment is needed, remove the hose and
fitting from the rear top port of the priority valve
and adjust pressure. Using an allen wrench, located
inside the port, turn clockwise to increase pressure
or counter-clockwise to decrease the pressure.
NOTE: The circuit relief is to be maintained at
2000 psi.
Insert the pressure gage in the test port on the
tube coming from the Ist or inboard pump
section.
Turn the steering wheel in either direction until
the rear wheels bottom against the stops.
continue to attempt to turn the wheel.
The gage should read 2000 psi with engine at
idle rpm.
4