HYDRAULIC SYSTEM
M6040, M7040, WSM
8-S1
1. TROUBLESHOOTING
9Y1210143HYS0001US0
Symptom Probable Cause Solution
Reference
Page
Implement Does Not
Raise (Not Noise)
Control linkage improperly assembled or
damaged
Repair or replace 8-S9
Control valve malfunctioning (unload valve,
spool, check valve, poppet valve)
Repair or replace 8-S26
Control valve broken Replace 8-S26
Control valve improperly adjusted Adjust 8-S26
Relief valve spring damaged Replace 8-S29
Cylinder damaged Replace 8-S28
Safety valve damaged Replace 8-S30
Implement Does Not
Raise (Noise)
Transmission fluid improper or insufficient Change or replenish G-10
Oil filter clogged Replace G-31
Relief valve setting pressure too low Adjust 8-S7
Relief valve spring weak or damaged Replace 8-S29
Hydraulic pump malfunctioning Repair or replace 8-S18
Implement Does Not
Reach Maximum
Height
Position rod and feedback rod improperly
adjusted
Adjust 8-S9
Draft rod and feedback rod improperly adjusted Adjust 8-S12
Implement Does Not
Lower
Control valve malfunctioning Repair or replace 8-S26
Spool damaged Replace 8-S26
Lowering speed adjusting valve closed Open –
Implement Drops by
Weight
Hydraulic cylinder worn or damaged Replace 8-S28
Safety valve damaged Replace 8-S30
Lowering speed adjusting valve damaged Replace 8-S31
Control valve malfunctioning (check valve seat
surface, check valve O-ring, poppet valve seat
surface and poppet valve O-ring damaged)
Replace 8-S26
Implement Hunts
(Moves Up and
Down)
Poppet valve, poppet seat surface damaged Replace 8-S26
Check valve, check valve seat surface damaged Replace 8-S26
Control valve O-ring worn or damaged Replace 8-S26
Draft Control
Malfunctioning
Draft control linkage improperly adjusted Adjust 8-S12
Torsion bar weak or broken Replace –
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