HYDRAULIC SYSTEM
L4100, WSM
8-S1
(EU)
1. TROUBLESHOOTING
Symptom
Probable Cause
Solution
Reference
Page
Implement Does Not
Rise (Without Noise)
Control linkage improperly adjusted
Adjust
Control linkage improperly assembled or
damaged
Repair or replace
Position control valve malfunctioning
(Unload poppet, spool, poppet 1, 2)
Repair or replace
Relief valve spring weaken or broken
Replace
Implement Does Not
Rise (With Noise)
Hydraulic piston O-ring, cylinder damaged
Replace
Transmission fluid improper or insufficient
Change or replenish
Hydraulic oil filter clogged
Replace
Suction pipe loosen or broken
Repair or replace
–
Relief valve setting pressure too low
Adjust
Relief valve spring weaken or damaged
Replace
Hydraulic pump malfunctioning
Repair or replace
Implement Does Not
Reach Maximum
Height
Position control feedback rod improperly
adjusted
Adjust
Top link length improperly adjusted
Adjust
–
Position control valve spool joint 1 improperly
adjusted
Adjust
Hydraulic arm shaft, hydraulic arm, lift arm
improperly assembled
Adjust
3 point link improperly set
Adjust
–
Implement Does Not
Lower
Position control valve malfunctioning
(Spool damaged)
Replace
Position control valve malfunctioning (Poppet 2,
adjusting set screw improperly adjusted)
Adjust
Draft control rod improperly adjusted
Adjust
Implement Drops by
Weight
Hydraulic cylinder worn or damaged
Replace
Hydraulic piston and O-ring worn or damaged
Replace
Lowering speed adjusting valve damaged
Replace
Poppet 1 seat surface damaged (control valve)
Replace
Poppet 1 O-ring damaged (control valve)
Replace
Poppet 2 seat surface damaged (control valve)
Replace
Poppet 2 O-ring damaged (control valve)
Replace
Implement Hunts
(Moves Up and
Down)
Poppet 1 seat surface damaged (control valve)
Replace
Poppet 1 O-ring damaged (control valve)
Replace
Poppet 2 sear surface damaged (control valve)
Replace
Poppet 2 O-ring damaged (control valve)
Replace
Poppet 2, adjusting set screw improperly
adjusted
Adjust
Draft Control
Malfunctioning
Draft control linkage improperly adjusted
Adjust
Torsion bar weaken or broken
Replace
–
KiSC issued 08, 2012 A
Summary of Contents for Kubota L4100
Page 1: ...L4100 WORKSHOP MANUAL TRACTOR KiSC issued 08 2012 A...
Page 3: ...I INFORMATION KiSC issued 08 2012 A...
Page 9: ...INFORMATION L4100 WSM I 5 EU 9Y1210278INI0002US0 KiSC issued 08 2012 A...
Page 13: ...INFORMATION L4100 WSM I 9 EU Mid mount type ROPS 9Y1210278INI0006US0 KiSC issued 08 2012 A...
Page 14: ...G GENERAL KiSC issued 08 2012 A...
Page 67: ...1 ENGINE KiSC issued 08 2012 A...
Page 130: ...2 CLUTCH KiSC issued 08 2012 A...
Page 160: ...3 TRANSMISSION KiSC issued 08 2012 A...
Page 161: ...CONTENTS 1 STRUCTURE 3 M1 MECHANISM KiSC issued 08 2012 A...
Page 201: ...4 REAR AXLE KiSC issued 08 2012 A...
Page 202: ...CONTENTS 1 STRUCTURE 4 M1 MECHANISM KiSC issued 08 2012 A...
Page 210: ...5 BRAKES KiSC issued 08 2012 A...
Page 211: ...CONTENTS 1 STRUCTURE 5 M1 2 OPERATION 5 M2 MECHANISM KiSC issued 08 2012 A...
Page 224: ...6 FRONT AXLE KiSC issued 08 2012 A...
Page 225: ...CONTENTS 1 STRUCTURE 6 M1 2 FRONT WHEEL ALIGNMENT 6 M2 MECHANISM KiSC issued 08 2012 A...
Page 245: ...7 STEERING KiSC issued 08 2012 A...
Page 264: ...8 HYDRAULIC SYSTEM KiSC issued 08 2012 A...