S0705010
Page 9
Cylinders
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Slow bucket and boom
movements.
Reduced oil flow due to dirty
filter or dirty intake line.
Disassemble and clean parts.
Air drawn into circuit through
loose connections.
Tighten intake connections.
Reservoir oil level too low. Fill reservoir to correct level.
Relief valve pressure setting
incorrect.
Adjust relief valve pressure.
Damaged pump shaft or pump
drive sleeve.
Replace damaged parts.
Pump worn or damaged
internally.
Replace worn or damaged parts.
Relief valve sticking. Disassemble and inspect
cartridge. Clean or replace
cartridge.
Air in pressure line. Perform cylinder bleeding
procedure to remove air. Tighten
or replace pressure line.
Damaged pipe or hose. Replace pipe or hose.
Worn cylinder seals. Replace worn parts.
Low pressure, shown by weak
upward movement of boom and
bucket.
Reduced oil flow due to dirty
filter or dirty intake line.
Disassemble and clean parts.
Reservoir oil level too low. Fill reservoir to correct level.
Relief valve pressure setting
incorrect.
Adjust relief valve pressure.
Pump worn or damaged
internally.
Replace worn or damaged parts.
Relief valve sticking. Disassemble and inspect
cartridge. Clean or replace
cartridge.
Worn cylinder seals. Replace worn parts.
Low pump output due to dirty
discharge pipes.
Remove and clean pump
discharge pipes.
Relief valve spring is weak.
Relief valve poppet worn.
Replace worn parts.
Cylinder drops when control
valve is in neutral.
Worn plunger in control valve. Replace plunger.
Stuck overload relief valve due
to worn seat surface.
Replace worn parts.
Loose pipes or joints. Tighten parts.
Worn piston seal on hydraulic
cylinder.
Replace seal.
Vibration or excessive noise. Excessive resistance in pump
intake line.
Inspect intake line and clean or
replace as necessary.
Air being drawn into intake line. Inspect pipe joints and tighten.
Chattering relief valve. Change oil, replace valve.
Problem Cause Remedy
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