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Problem
Erratic steering
Spongy or soft steering
Free play at steering
wheel
Steering unit binding or
steering wheel does not
immediately return to
neutral when released
Steering unit locks up
Abrupt steering wheel
oscillation
Steering wheel turns by
itself
Vibration
in
steering
system or hoses jump
Neutral position of steering
wheel cannot be obtained,
i.e. there is a tendency
towards "motoring"
Cause
Air in oil
Low oil level
Sticking priority valve spool
Loose cylinder piston
Damaged steering unit
Air in oil
Low oil level
Loose steering wheel nut
Worn or damaged splines on steering
column or unit
Binding in steering column or misalignment
of column
High return pressure
Contamination in steering unit
Large particles of contamination in steering
unit
Worn or damaged steering unit
Improperly timed gerotor gear in steering
unit
Lines connected to wrong port
High priority valve setting
Steering column and steering unit out of
line
Too little or no play between steering
column and steering unit input shaft
Pinching between inner and outer spools
Check for foamy oil.
Add recommended oil.
Remove and inspect spool.
Remove rod to inspect piston.
Remove and inspect.
Check for foamy oil.
Add recommended oil.
Tighten.
Inspect.
Inspect.
Check for a pinched or damaged return
line.
Inspect hydraulic filter for contamination.
Repair cause of contamination.
hydraulic system.
Inspect hydraulic filter for contamination.
Repair cause of contamination.
hydraulic system.
Repair or replace steering unit.
Time gerotor gear.
Reconnect lines.
Do priority valve pressure test.
Align the steering column with steering unit.
Adjust the play and, if necessary, shorten
the splines journal.
Contact the nearest service shop.
5-13
Remedy
Flush
Flush
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