Hyundai HL955 Manual page 420

Problem
Slow or hard steering Slow or hard steering
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
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
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
Steering wheel turns with Steering wheel turns with
no resistance and causes no resistance and causes
no frame movement no frame movement
Cause
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.
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.
Leakage in steering unit gerotor.
Worn steering unit gerotor.
Leakage in steering system.
Broken steering column or splined cou-
pling.
Lack of oil in steering unit.
Leakage in steering system.
5-16
Remedy
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.
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.
Do steering system leakage check.
Do steering leakage check.
Do steering system leakage check.
Remove and inspect.
Start engine and check steering operation.
Do steering system leakage test in group 3.