SERVICING
TROUBLESHOOTING
LA271 • LA301 • LA351 • LA401 • LA272 • LA302 • LA352 • LA402 WSM, 17021
Symptom
Probable Cause
Solution
Reference
Page
Boom Does Not Rise
• Control valve malfunctioning
Repair or replace
8-9
• Boom cylinder defective
Repair or replace
8-12
• Control lever linkage defective
Repair or replace
-
• Hydraulic pump malfunctioning
Repair or replace
-
• Oil filter clogged
Clean or replace
-
• Relief valve spring damaged Replace
-
• Hydraulic hose damaged Replace
-
• Relief valve dirty or stuck Clean
-
Boom Does Not
• Control valve malfunctioning
Repair or replace
8-9
Lower
Insufficient Boom
• Boom cylinder tube worn or damaged Replace 8-12
Speed
• Boom cylinder piston ring (piston seal and
0-
Replace 8-13
ring) worn or damaged
• Oil leaks from tube joints
Repair
-
• Relief valve setting pressure too low Adjust
8-9
• Insufficient transmission fluid Refill
8-2
• Dirty relief valve
Clean
-
Bucket Does Not
• Control valve malfunctioning
Repair or replace
8-9
Move
• Bucket cylinder defective
Repair or replace
8-12
• Control lever linkage defective
Repair or replace
-
• Hydraulic pump malfunctioning
Repair or replace
-
• Oil filter clogged
Clean or replace
-
• Relief valve spring damaged
Replace
-
• Hydraulic hose damaged
Replace
-
• Dirty relief valve
Clean
-
Insufficient Bucket
• Bucket cylinder tube worn or damaged
Replace
8-12
Speed
• Bucket cylinder piston ring (piston seal and
0-
Replace
8-13
ring) worn or damaged
• Oil leaks from tube joints
Repair
-
• Relief valve setting pressure too low Adjust
8-9
• Insufficient transmission fluid
Refill
8-2
• Dirty relief valve
Clean
-
Front End Loader
• Boom cylinder tube worn or damaged Replace
8-12
Drops by Its Weight
• Boom cylinder piston ring (piston seal and
0-
Replace 8-13
ring) worn or damaged
• Oil leaks from tube joints
Repair
-
• Control valve malfunctioning Repair or replace
-
17020800010
8-4
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