Hyundai HL955, Manual

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5-16
Problem Cause Remedy
Slow or hard steering Slow or hard steering Too much friction in the mechanical
parts of the machine.
Cold oil.
Low priority valve pressure setting.
Worn hydraulic pump.
Sticking priority valve spool.
Broken priority valve spring.
Lubricate bearings and joints of steering
column or repair if necessary.
Check steering column installation.
Warm the hydraulic oil.
Do priority valve pressure test.
Clean or replace cartridge in steering valve.
Do hydraulic pump performance check.
Remove and inspect.
Remove and inspect.
C o n s t a n t s t e e r i n g t o C o n s t a n t s t e e r i n g t o
maintain straight travel
maintain straight travel
Air in system.
Leakage in steering system.
Worn steering unit.
Leaf spring without spring force or broken.
Spring in double shock valve broken.
Gear wheel set worn.
Cylinder seized or piston seals worn.
Check for foamy oil.
Do steering system leakage check.
Do steering system leakage check.
Do steering unit neutral leakage test in
group 3.
Replace leaf springs.
Replace shock valve.
Replace gear wheel set.
Replace defects parts.
S l o w s t e e r i n g w h e e l S l o w s t e e r i n g w h e e l
movement will not cause
movement will not cause
any frame movement
any frame movement
Leakage in steering unit gerotor.
Worn steering unit gerotor.
Do steering system leakage check.
Do steering leakage check.
Steering wheel can be Steering wheel can be
t u r n e d w i t h f r a m e s
t u r n e d w i t h f r a m e s
against steering stop
against steering stop
Leakage in steering system. Do steering system leakage check.
Steering wheel turns with Steering wheel turns with
no resistance and causes
no resistance and causes
no frame movement
no frame movement
Broken steering column or splined cou-
pling.
Lack of oil in steering unit.
Leakage in steering system.
Remove and inspect.
Start engine and check steering operation.
Do steering system leakage test in group 3.