Hyundai HL955 Manual page 418

※ Hydraulic oil must be at operating temperature for these checks (refer to page 6-55).
Item
Steering unit check Steering unit check
Steering system leakage Steering system leakage
check check
Heat hydraulic oil to
operating temperature.
Run engine at high idle.
Priority valve (in steering Priority valve (in steering
valve) low pressure valve) low pressure
check check
Priority valve (in steering Priority valve (in steering
valve) high pressure valve) high pressure
check check
Run engine at high idle.
Description
Run engine at low idle.
Turn steering wheel until frames are
at maximum right (A) and then left
(B) positions.
L O O K : Fra m e s mu s t m ove L O O K
smoothly in both directions.
When steering wheel is stopped,
frames must stop.
FEEL FEEL : Excessive effort must not be
required to turn steering wheel.
NOTE : It is normal for steering to NOTE
drift from stops when steering
wheel is released.
Turn steering wheel rapidly until
frames are against stop.
Left Right
Hold approximately 2 kg on steer-
ing wheel.
Count steering wheel revolutions
for 1 minute.
Repeat test in opposite direction.
LOOK LOOK : Steering wheel should
rotate less than 7 rpm.
NOTE : Use good judgment; NOTE
Excessive steering wheel rpm does
not mean steering will be affected.
Park machine on a hard surface.
Hold brake pedal down.
Run engine at high idle.
Steer machine to the right and left
as far as possible.
LOOK : Machine must turn at least LOOK
half way to the right and left stops.
Steer to steering stop and release
steering wheel.
Roll bucket back and hold over
relief and observe engine rpm.
Turn steering wheel to steering
stop and hold, observe engine rpm.
LOOK : Steering stall engine rpm LOOK
must be higher than hydraulic stall
rpm.
5-14
Service action
OK OK
Check completed.
NOT OK NOT OK
Go to next check.
OK OK
Check completed.
NOT OK NOT OK
Do steering system leakage
test in group 3 to isolate the
leakage.
OK OK
Check completed.
NOT OK NOT OK
Do steering valve (EHPS)
pressure test in group 3.
OK OK
Check completed.
NOT OK NOT OK
Priority pressure is set too
high. Do steering valve
(EHPS) pressure test in
group 3.