HYDRAULIC TROUBLESHOOTING
11-4 TX 413 Service ManualRev. 001
Operational Troubleshooting cont.
Loss of Hydraulic Function cont.
Pressure Line Leaks
• Tighten loose ttings/Replace damaged ttings
• Replace damaged seal(s)
Relief Valve
• Pressure test to ensure the valve is opening at the
rated pressure
• Look for leaks, replace damaged seals
• Clean the valve and inspect for broken spring
Erratic Operation
Air in the System
• Inspect suction side for leaks
• Ensure Reservoir is at the full mark
Cold Fluid
• Fluid viscosity too thick
• Allow uid to reach operating temperature prior to
operating hydraulic functions
Components Sticking/Binding
• Inspect for dirt and other contaminants
• Check for worn or bent parts
Quick Coupler Worn
• Replace
Damaged Pump
• Check and replace broken or worn bearings
• Repair or replace pump
• Belt or pulley (hydrostatic pump)
Contaminants in the Relief Valve
• Clean and test
Filter/Suction Line Restriction
• Collapsed suction hoses or lter lines restricting
ow
Slow Operation
Cold Fluid
• Fluid viscosity too high
• Allow uid to reach operating temperature prior to
operating hydraulic functions
Low Engine Speed
• Adjust to engine manufacturer specication
Low Fluid Level
• Fill reservoir to the full mark
• Check system for external leaks
Air in the System
• Inspect suction side for leaks
• Ensure Reservoir is at the full mark
Worn/Damaged Pump
• Replace pump
• Check uid
• Check for proper alignment
• Belt or pulley (hydrostatic pump)
Filter/Suction Line Restriction
• Collapsed suction hoses or lter lines restricting
ow
Relief Valve
• Pressure test to ensure the valve is opening at the
rated pressure
• Look for leaks, replace damaged seals
• Clean the valve and inspect for broken spring
Worn/Damaged Components
• Check Valves, wheel motors and cylinders for
damage/leaks
• Repair/Replace as necessary
Pressure Line Leaks
• Tighten loose ttings/Replace damaged ttings
• Replace damaged seal(s)
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