Gradall 534B (9020-7317) Service Manual - Manual (Page 112)

HOW TO TEST AND ADJUST
PILOT CIRCUIT PUMP RELIEF VALVE
The circuit relief for the steering circuit is located in
the priority flow divider valve.
G R A D A L L L O E D M AT E R I A L H A N D L E R 5 3 4 B T E S T I N G A N D A D J U S T I N G
R e m o v e t h e o n e e n d o f t h e h o s e ( a t P i l o t
P r e s s u r e C o n t r o l Va l v e ) t h a t c o m e s f r o m t h e
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 450 psi.
If adjustment is needed, loosen jam nut on the
relief valve and screw adjusting screw clockwise
to raise pressure and counter-clockwise to lower
pressure. Set pressure at 450 psi. Tighten jam nut.
I f a d j u s t m e n t c a n n o t b e m a d e , r e p l a c e r e l i e f
valve.
Replace hoses and remove gage.
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TESTING AND ADJUST
STEERING CIRCUIT RELIEF VALVE
PILOT CIRCUIT PUMP RELIEF VALVE
450 psi
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 the test port on the
tube coming from the 1st 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.
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