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※ Hydraulic oil must be at operating temperature for these checks.
Item
Steering unit check
Steering system leakage
check
Heat hydraulic oil to
operating temperature.
Run engine at high idle.
Priority valve(In main
pump) low pressure
check
Priority valve(In main
pump) high pressure
check
Run engine at high idle.
Description
Run engine at low idle.
Turn steering wheel until frames are
A
at maximum right(A) and then
left(B) positions.
LOOK : Frames must move
B
smoothly in both directions.
When steering wheel is stopped,
tires must stop.
FEEL : Excessive effort must not
be required to turn steering wheel.
NOTE : It is normal for steering to
drift from stops when steering
wheel is released.
Turn steering wheel rapidly until
frames are against stop.
Right
Left
Le f
Ri g h
Hold approximately 2kg on steering
wheel.
Count steering wheel revolutions for
1 minute.
Repeat test in opposite direction.
LOOK : Steering wheel should
rotate less than 3rpm.
NOTE : Use good judgment;
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
half way to the right and left stops.
Steer to steering stop and release
steering wheel.
Lower
Lift, tilt hold over relief and observe
Lift
engine rpm.
Turn steering wheel to steering stop
and hold, observe engine rpm.
LOOK : Steering stall engine rpm
must be higher than hydraulic stall
rpm.
5-10
Service action
OK
Check completed.
NOT OK
Go to next check.
OK
Check completed.
NOT OK
Do steering system leaka-
ge test in group 3 to isola-
te the leakage.
OK
Check completed.
NOT OK
Do priority valve pressure
test.
OK
Check completed.
NOT OK
Priority pressure is set too
high. Do priority valve
pressure test.
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