wsm Kubota L4100 Workshop Manual page 279

L4100, WSM
1. TROUBLESHOOTING
Symptom
Implement Does Not
Rise (Without Noise)
Implement Does Not
Rise (With 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 adjusted
Control linkage improperly assembled or
damaged
Position control valve malfunctioning
(Unload poppet, spool, poppet 1, 2)
Relief valve spring weaken or broken
Hydraulic piston O-ring, cylinder damaged
Transmission fluid improper or insufficient
Hydraulic 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
Position control valve spool joint 1 improperly
adjusted
Hydraulic arm shaft, hydraulic arm, lift arm
improperly assembled
3 point link improperly set
Position control valve malfunctioning
(Spool damaged)
Position control valve malfunctioning (Poppet 2,
adjusting set screw improperly adjusted)
Draft control rod improperly adjusted
Hydraulic cylinder worn or damaged
Hydraulic piston and O-ring worn or damaged
Lowering speed adjusting valve damaged
Poppet 1 seat surface damaged (control valve)
Poppet 1 O-ring damaged (control valve)
Poppet 2 seat surface damaged (control valve)
Poppet 2 O-ring damaged (control valve)
Poppet 1 seat surface damaged (control valve)
Poppet 1 O-ring damaged (control valve)
Poppet 2 sear surface damaged (control valve)
Poppet 2 O-ring damaged (control valve)
Poppet 2, adjusting set screw improperly
adjusted
Draft control linkage improperly adjusted
Torsion bar weaken or broken
Adjust
Repair or replace
Repair or replace
Replace
Replace
Change or replenish
Replace
Repair or replace
Adjust
Replace
Repair or replace
Adjust
Adjust
Adjust
Adjust
Adjust
Replace
Adjust
Adjust
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Adjust
Adjust
Replace
8-S1
HYDRAULIC SYSTEM
Reference
Solution
Page
8-S11
8-S21
8-S18
8-S10
8-S17
G-9
G-17
–
8-S10
8-S20
8-S20
8-S11
–
8-S18
8-S17
–
8-S18
8-S18
8-S12
8-S22
8-S17
8-S16
8-S19
8-S19
8-S18
8-S19
8-S19
8-S19
8-S19
8-S19
8-S19
8-S12
–
KiSC issued 08, 2012 A
(EU)