L10016 05/03 Hydraulic Check-out Procedure L10-9
Noise or squeal
Low compensator pressure setting.
Fluid too cold or viscosity too high.
Air leak at inlet connection.
Insufficient inlet oil.
Broken or worn piston/shoe assem-
bly.
Check compensator pressure setting.
Use proper viscosity oil or warm oil before
starting.
Inspect inlet hose and connections for
looseness.
Check for proper hydraulic tank oil level.
Check for clogged suction strainer. Make
sure suction line shut-off valve is open.
Repair or replace broken/worn parts.
Steering function slow
Low pressure compensator pres-
sure setting.
Plugged filter or suction strainer.
Check and adjust compensator pressure
setting.
Replace filter element or clean suction
strainer.
Irregular or unsteady
operation
Fluid level is reservoir is low or
supercharge is insufficient.
Air entering hydraulic system.
Worn piston pump.
Faulty output circuit components.
Check for proper hydraulic tank oil level.
Inspect inlet hose and connections.
Repair or replace broken/worn parts.
Repair or replace relief valve or pressure
compensator valve.
Excessive heating
Operating pump above rated pres-
sure.
Low fluid level in reservoir.
Air entering hydraulic system.
Worn piston pump.
Worn or grooved cylinder wear plate
and/or port plate.
Faulty output circuit components.
Refer to “Pressure Check and Adjustment
Procedure”, this Section.
Check for proper oil level in hydraulic tank.
Inspect inlet hose and connections.
Repair or replace worn components.
Repair or replace worn components.
Repair or replace relief valve or pressure
compensator valve.
TROUBLESHOOTING CHART
(Steering Pump)
Trouble Possible Cause Suggested Corrective Action
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