5 - 33
System
Faults
Possible causes
Solutions
Steering
System
Hydraulic steering
system does not work.
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Pump worn or part damaged
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Steering unit damaged or worn
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Oil leakage by steering
cylinder piston seal damaged or
worn
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Oil leakage by pipe damage
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Repair or replace
▲
Repair or replace
▲
Repair
▲
Repair or replace
Hard to operate the
steering wheel.
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Steering unit
- Steering unit spline and column
spline does not aligned
- Spool and sleeve damaged by
foreign material
- Excessive tightening torque of
end cap bolt
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Pump
- Low speed
- Wearing, failure
▲
Relief valve
- Valve spool clogged
- Setting pressure too low
▲
- Check mounted condition of
steering unit and column
- Replace
- Apply regular torque
▲
- Adjust RPM or Repair
- Repair or replace
▲
- Repair or replace
- Reset or adjust
Cylinder does not work
smoothly as steering
wheel movement
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Air in steering line if not used
for a long time
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Air in suction pipe
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Piston seal damaged
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Bleed air
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Repair
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Replace
Steering wheel turns to
the opposite direction.
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Bad assembly of steering gear
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Bad assembly of steering hose
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Repair
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Repair
Oil leakage of steering
pump, steering unit,
cylinder and fittings
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Seal damaged
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Replace seal
Abnormal noise
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Lack of oil
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Exceeding resistance of
suction line
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Air in system
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Aid oil
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Replace filter
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Bleed air
