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6-42
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Hydraulic oil must be at operating temperature for these checks (refer to page 6-55).
Item
Description
Service action
Hydraulic system warm-up
procedure
Run engine at high idle.
Refer to page 6-55.
Hold a hydraulic function over relief
to heat oil. (don't keep relief
condition over 5 seconds at a time)
Periodically cycle all hydraulic
functions to distribute warm oil.
Repeat procedure until oil is at
operating temperature.
FEEL : Hydraulic reservoir must be
uncomfortable to hold your hand
against.
(approximately 40 ~50˚C)
OK
Check completed.
Hydraulic pump
performance check
H e a t hy d r a u l i c o i l t o
operating temperature.
Run engine at high idle.
With bucket flat on ground, actuate
boom raise. Time how long it takes
to raise boom to full height.
LOOK : Boom must raise to full
height in less than 7 seconds.
OK
Check completed.
NOT OK
Go to priority valve (in
s t e e r i n g v a l v e ) h i g h
pressure check at page
5-26.
IF OK
D o s t e e r i n g s y s t e m
leakage check at page
5-27.
IF OK
Do main hydraulic pump
flow test at page 6-56.
Control valve lift check
Run machine at low idle.
With bucket partially dumped,
lower boom to raise front of
machine.
Slowly move boom control lever
( R C V l eve r ) t o b o o m l o w e r
position.
Slowly move bucket control lever to
bucket dump position.
LOOK : Boom must not raise
before moving down.
Bucket must not rollback before
dumping.
OK
Check complete.
NOT OK
Repair lift checks in loader
control valve.
Summary of Contents for HL955
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