wsm M108S Workshop Manual page 386

M108S, WSM
1. TROUBLESHOOTING
Symptom
Implement Does Not
Rise (Not Noise)
Implement Does Not
Rise (Noise)
Implement Does Not
Reach Maximum
Height
Implement Does Not
Lower
Implement Drops by
Weight
Implement Hunts
(Moves Up and
Down)
Draft Control
Malfunctioning
Probable Cause
Control linkage improperly assembled or
damaged
Control valve malfunctioning (unload valve,
spool, check valve, poppet valve)
Control valve broken
Control valve improperly adjusted
Relief valve spring damaged
Hydraulic piston O-ring, cylinder damaged
Safety valve damaged
Transmission fluid improper or insufficient
Oil filter clogged
Relief valve setting pressure too low
Relief valve spring weak or damaged
Hydraulic pump malfunctioning
Position rod and control lever improperly
adjusted
Draft rod and draft control rod improperly
adjusted
Lever stopper position improper
Control valve malfunctioning
Spool damaged
Poppet valve improperly adjusted (Adjusting
screw of poppet valve)
Lowering speed adjusting valve closed
Hydraulic cylinder worn or damaged
Hydraulic piston O-ring worn or damaged
Safety valve damaged
Lowering speed adjusting valve damaged
Control valve malfunctioning :
Check valve seat surface damaged
Check valve O-ring damaged
Poppet valve seat surface damaged
Poppet valve O-ring damaged
Poppet valve, poppet seat surface damaged
Check valve, check valve seat surface damaged
Control valve O-ring worn or damaged
Draft control linkage improperly adjusted
Torsion bar weak or broken
Repair or replace
Repair or replace
Replace
Adjust
Replace
Replace
Replace
Change or replenish
Replace
Adjust
Replace
Repair or replace
Adjust
Adjust
Adjust
Repair or replace
Replace
Adjust
Open
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Adjust
Replace
8-S1
HYDRAULIC SYSTEM
Reference
Solution
Page
8-S7
8-S14, 15
8-S14
8-S14
8-S13
8-S18
8-S13
G-7
G-16
8-S6
8-S13
8-S11, 19
8-S7
8-S9, 10
–
8-S14
8-S14
8-S14
8-S18
8-S19
8-S18
8-S13
8-S18
8-S15
8-S15
8-S15
8-S15
8-S15
8-S15
8-S15
8-S9, 10
8-S9
W1014322
KiSC issued 05, 2012 A