5-14
※
Hydraulic oil must be at operating temperature for these checks (refer to page 6-55).
Item
Description
Service action
Steering unit check
Steering unit check
Run engine at low idle.
Turn steering wheel until frames are
at maximum right (A) and then left
(B) positions.
L O O K
L O O K : Fr a m e s m u s t m ove
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
NOTE : It is normal for steering to
drift from stops when steering
wheel is released.
OK
OK
Check completed.
NOT OK
NOT OK
Go to next check.
Steering system leakage
Steering system leakage
check
check
Heat hydraulic oil to
operating temperature.
Run engine at high idle.
Turn steering wheel rapidly until
frames are against stop.
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
NOTE : Use good judgment;
Excessive steering wheel rpm does
not mean steering will be affected.
OK
OK
Check completed.
NOT OK
NOT OK
Do steering system leakage
test in group 3 to isolate the
leakage.
Priority valve (in steering
Priority valve (in steering
valve) low pressure
valve) low pressure
check
check
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
LOOK : Machine must turn at least
half way to the right and left stops.
OK
OK
Check completed.
NOT OK
NOT OK
Do steering valve (EHPS)
pressure test in group 3.
Priority valve (in steering
Priority valve (in steering
valve) high pressure
valve) high pressure
check
check
Run engine at high idle.
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
LOOK : Steering stall engine rpm
must be higher than hydraulic stall
rpm.
OK
OK
Check completed.
NOT OK
NOT OK
Priority pressure is set too
high. Do steering valve
(EHPS) pressure test in
group 3.
Left
Right
A
B
Summary of Contents for HL955
Page 557: ...7 6 MEMORANDUM MEMORANDUM ...
