Kubota MX5100 - Hydraulic System Troubleshooting

8-S1
MX5100, WSM
HYDRAULIC SYSTEM
1. TROUBLESHOOTING
W1014322
Symptom Probable Cause Solution
Reference
Page
Implement Does Not
Rise (Without Noise)
Control linkage improperly adjusted Adjust 8-S12, S13
Control linkage improperly assembled or
damaged
Repair or replace 8-S12, S20,
S21
Position control valve malfunctioning
(unload poppet, spool, poppet 1, 2)
Repair or replace 8-S21
Relief valve spring weaken or broken Replace 8-S23
Hydraulic piston O-ring, cylinder damaged Replace 8-S19
Implement Does Not
Rise (With Noise)
Transmission fluid improper or insufficient Change or replenish G-31
Hydraulic oil filter clogged Replace G-31
Suction pipe loosen or broken Repair or replace –
Relief valve setting pressure too low Adjust 8-S11
Relief valve spring weaken or damaged Replace 8-S23
Hydraulic pump malfunctioning Repair or replace 8-S14
Implement Does Not
Reach Maximum
Height
Position control feedback rod improperly
adjusted
Adjust 8-S12
Top link length improperly adjusted Adjust –
Position control valve spool joint 1 improperly
adjusted
Adjust 8-S21, S22
Hydraulic arm shaft, hydraulic arm, lift arm
improperly assembled
Adjust 8-S20
3 point link improperly set Adjust –
Implement Does Not
Lower
Position control valve malfunctioning
(Spool damaged)
Replace 8-S21, S22
Position control valve malfunctioning (Poppet2,
adjusting set screw improperly adjusted)
Adjust 8-S21, S22
Draft control rod improperly adjusted
(if equipped)
Adjust 8-S13
Implement Drops by
Weight
Hydraulic cylinder worn or damaged Replace 8-S27
Safety valve damaged Replace 8-S24
Hydraulic piston and O-ring worn or damaged Replace 8-S19
Lowering speed adjusting valve damaged Replace 8-S22
Poppet 1 valve seat surface damaged (control
valve)
Replace 8-S21, S22
Poppet 1 fulcrum pin O-ring damaged (control
valve)
Replace 8-S21, S22
Poppet 2 sleeve seat surface damaged (control
valve)
Replace 8-S21, S22
Poppet 2 sleeve O-ring damaged (control valve) Replace 8-S21, S22