Servicing; Troubleshooting For Front Loader - Kubota LA344 Workshop Manual

SERVICING

1. Troubleshooting for front loader

SERVICING
1. Troubleshooting for front loader
Symptom
Boom does not rise.
Boom does not lower.
Boom speed is insufficient.
Bucket does not move.
LA344, LA344S
Probable cause and checking
procedure
1. Control valve is damaged.
2. Boom cylinder is damaged.
3. Control lever linkage is dam-
aged.
4. Hydraulic pump is damaged.
5. Relief valve spring is dam-
aged.
6. Relief valve is dirty.
7. Oil filter is clogged.
8. Hydraulic hose is damaged.
1. Control valve is damaged.
2. Control lever linkage is dam-
aged.
1. Boom cylinder tube is worn or
damaged.
2. Boom cylinder piston ring (pis-
ton seal and O-ring) is worn or
damaged.
3. Oil leaks from tube joints.
4. Relief valve setting pressure is
too low.
5. Transmission fluid is insuffi-
cient.
6. Relief valve is dirty.
1. Control valve is damaged
2. Bucket cylinder is damaged.
3. FRONT LOADER
Solution
Repair or replace control valve.
Repair or replace boom cylinder.
Repair or replace control lever
linkage.
Repair or replace hydraulic
pump.
Replace relief valve spring.
Clean relief valve.
Clean or replace oil filter.
Replace hydraulic hose.
Repair or replace control valve.
Repair or replace control lever
linkage.
Replace boom cylinder tube.
Replace boom cylinder piston
ring (piston seal and O-ring).
Repair tube joints.
Adjust relief valve.
Fill transmission fluid.
Clean relief valve.
Repair or replace control valve.
Repair or replace bucket cylin-
der.
Refer-
ence
page
Tractor
WSM
3-28
Tractor
WSM
Tractor
WSM
Tractor
WSM
Tractor
WSM
—
3-28
Tractor
WSM
Tractor
WSM
3-28
3-30
—
Tractor
WSM
Tractor
WSM
Tractor
WSM
Tractor
WSM
3-28
(Continued)
3-11
KiSC issued 02, 2017 A