Gradall 534B (9103-1390) Service Manual - Manual (Page 85)

HOW TO TEST AND ADJUST
DRIVE CIRCUIT RELIEF VALVES
8
Install pressure gage in test port (1st, inboard
section) of the tandem pump tube.
(A)
Start engine.
Pull parking brake valve knob up to set brake.
Hold inching/service brake completely down and
place transmission in 2nd gear forward.
Slowly release service brake pedal, metering oil to
rear drives.
Observe gage reading. The circuit relief in the
Forward/Reverse Control Valve should open at
3000 psi.
1.
2.
3.
4.
5.
6.
Adjust, reseal or replace relief valve as neces-
sary. The forward circuit relief valve is located
closest to the inside of the machine within the
Forward/Reverse Control Valve.
REPEAT THE ABOVE STEPS WITH TRANS-
MISSION IN REVERSE.
The reverse relief
valve is toward the outside of the machine within
the Forward/Reverse Control Valve.
Turn engine off.
Remove Test gage and recap test port.
7.
8.
9.
10.
NOTE: Park Material Handler on level ground with
the forks on ground. Chock the wheels before
performing this test. Use caution while letting the
brake/inching pedal out . . . once pedal is released far
enough, the front wheels will engage and attempt to
drive the unit.