PS M6.0 6000
001 OE35
Version no T-code
F-code Section C-code
Hydraulic Troubleshooting
246
Service Manual 1997-10-23
The normal troubles that may occur with the pump assembly
have been grouped under three headings: Failure to
(A)
Raise
(B)
Hold
(C)
Lower the load. One or more of the listed
trouble sources may be causing improper operation. Refer to
the proper heading (i.e. relief valve) for detailed instructions
for disassembly, check and adjustment of parts to remedy the
trouble.
A. If pump operates but will only develop low pressure or
slow lift:
1. Relief valve seat scored, foreign particles under
ball or relief valve out of adjustment (See relief
valve).
2. Dirt in solenoid-operated release (See solenoid
operated release valve).
3. Pump worn - replace pump.
B. If pump develops pressure but will not hold:
1. Dirt in solenoid-operated release (See solenoid
operated release valve).
2. Relief valve seat scored, foreign particles under
ball or relief valve out of adjustment (See relief
valve).
C. If pump develops pressure but will not release load:
1. No electrical contact to solenoid operated release
valve (See solenoid operated release valve).
2. Solenoid in solenoid-operated release valve
burned out.
3. Relief valve bottomed causing pressure to go
beyond the unloading limit of the solenoid release
valve (See relief valve).
Lift
A. No lift; pump motor runs.
1. Hydraulic fluid reservoir low or empty.
Check hydraulic fluid level, fill to within 2 in. of filler
tube with new clean oil.
2. Manual lowering valve open or leaking.
Close or replace manual lowering valve.
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