wsm L503 Workshop Manual page 441

L3130 · L3430 · L3830 · L4630 · L5030, WSM
1. TROUBLESHOOTING
Symptom
Implement Does Not
Rise (Not Noise)
(Noise)
Implement Does Not
Reach Maximum
Height
Implement Does Not
Lower
Implement Drops by
Weight
Implement Hunts
(Moves Up and
Down)
Oil Temperature
Increases Rapidly
Probable Cause
• Control linkage improperly adjusted
• Control linkage improperly assembled or
damaged
• Position control valve malfunctioning
• Relief valve spring weaken or broken
• Hydraulic piston O-ring, cylinder damaged
• Transmission fluid improper or insufficient
• Oil filter clogged
• Suction pipe loosen or broken
• Relief valve setting pressure too low
• Relief valve spring weaken or damaged
• Hydraulic pump malfunctioning
• Position control feedback rod improperly
adjusted
• Top link length improperly adjusted
• Hydraulic arm shaft, lift arm improperly
assembled
• 3 point link improperly set
• Position control valve malfunctioning
- Spool damaged
- Poppet 2, push rod improperly adjusted
• Hydraulic cylinder worn or damaged
• Safety valve damaged
• Hydraulic piston and O-ring worn or damaged
• Lowering speed adjusting valve damaged
• Position control valve malfunctioning
- Poppet 2 seat surface damaged
- Poppet 2 seat sleeve O-ring damaged
• Position control valve malfunctioning
- Poppet 2 seat surface damaged
- Poppet 2 seat sleeve O-ring damaged
• Poppet 2, push rod improperly adjusted
• Relief valve operating
- Relief valve malfunctioning
- Hydraulic line is clogged
• Hydraulic pump leak or damaged
• Oil leaks from valves
Adjust
Repair or replace
Repair or replace
Replace
Replace
Change or replenish
Replace
Repair or replace
Adjust
Replace
Repair pr replace
Adjust
Adjust
Adjust
Adjust
Replace
Adjust
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Adjust
Adjust or replace
Clean or replace
Repair or replace
Repair or replace
8-S1
HYDRAULIC SYSTEM
Reference
Solution
Page
8-S12
–
8-S15 to
S17
8-S11
8-S19
G-7, 8
G-16
–
8-S11
8-S11
8-S7 to S10
8-S12
–
8-S20
–
8-S17
8-S17
8-S19
8-S16
8-S19
8-S15
8-S17
8-S17
8-S17
8-S17
8-S17
8-S11
–
8-S7 to S10
–
W10143220
KiSC issued 02, 2007 A