HYDRAULIC TROUBLESHOOTING
11-6 TX 413 Service ManualRev. 001
Pumps cont.
Leaky Pump
Damaged Shaft Seal
• Replace seal
• Check uid for contamination
• Ensure shaft alignment
Damaged Pump Parts
• Tighten loose bolts and or ttings
• Inspect housing for cracks
Noisy Pump
Low Fluid Level
• Fill reservoir with recommended uid
• Check for system leaks
Fluid Viscosity Too Thick
• Flush system and change to recommended uid
Suction Line Restricted
• Clean or replace the line between reservoir and
pump
Dirty Pump
• Disassemble and clean the pump and suction line
• Determine the source
Plugged Reservoir Vent
• Remove breather cap and clean the vent line
Air in the Fluid
• Tighten loose suction line ttings
• Check for system leaks
• Replace pump seals
Worn/Damaged Pump Bearings or Shaft
• Replace worn parts
• Determine the cause
• Belt and pulley
Inlet Screen Plugged
• Remove and clean screens
Broken or Damaged Pump Parts
• Replace damaged parts
• Check for contamination
• System pressure set too high
Sticking/Binding Parts
• Eliminate cause of binding
• Clean parts
• Flush system and change the uid
Wheel Motors
Simply put, wheel motors are pumps used back-
wards. Wheel motors receive hydraulic pressure
and ow from a pump and convert it back into rotary
mechanical energy.
Leakage
• Loose, worn or damaged ttings
• Damaged seals
• Loose, worn or damaged bolts
• Internal shaft seal damaged
• Internal parts out of tolerance due to wear
• Hub not on properly or not torqued properly
Loss of Drive
• Lack of oil
• Excessive internal leakage
• Worn or damaged internal splines
• Excessive heat
Slow/Erratic Behavior
• Oil temperature too cold
• Incorrect oil viscosity
• Restriction or air leak at the pump
• Insufcient pump speed
• Internal parts sticking
• Internal parts out of tolerance due to wear
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