Hyundai HL955 Manual page 421

Problem
Erratic steering Erratic steering
Spongy or soft steering Spongy or soft steering
Free play at steering Free play at steering
wheel wheel
Steering unit binding or Steering unit binding or
steering wheel does not steering wheel does not
immediately return to immediately return to
neutral when released neutral when released
Steering unit locks up Steering unit locks up
Abrupt steering wheel Abrupt steering wheel
oscillation oscillation
Steering wheel turns by Steering wheel turns by
itself itself
Vibration in steering sys- Vibration in steering sys-
tem or hoses jump tem or hoses jump
Neutral position of steer- Neutral position of steer-
i n g w h e e l c a n n o t b e i n g w h e e l c a n n o t b e
obtained, i.e. there is a obtained, i.e. there is a
t e n d e n c y t o w a r d s t e n d e n c y t o w a r d s
"motoring" "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 misalign-
ment 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 steer-
ing 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.
5-17
Remedy
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. Flush
hydraulic system.
Inspect hydraulic filter for contamination.
Repair cause of contamination. Flush
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, short-
en the splines journal.
Contact the nearest service shop.