H-3
No work equipment, travel, swing move
Y
1
Is safety lock valve
working properly?
H-4
Abnormal noise generated
Cause
2m
When main pump
pressure pickup
plug is removed,
does oil come out?
Defective control pump,
control relief valve, or
defective control circuit
* Crank with
NO
Defective damper
starting motor.
Defective operation of safety
lock valve or safety lock
linkage
I
(around pump)
Cause
Is hydraulic tank oil
level normal?
Are there bubbles
inside hydraulic
tank?
3 YES
\KH-Goto4
NO
Is suction strainer
- External object:
Cloth, etc.
Is suction strainer
clogged with metal
Defective hydraulic oil
Clogged by external object
(cloth, etc.)
Defect inside pump
Operate for a short time and
watch for any change in
symptoms
Lack of hydraulic oil
Remedy
leplace
ieplace
\djust
Remedy
teplace
rydraulic oil
temove
3epair or
,eplace
nspect again’
depending on
:hanges in
symptoms)
Idd hydraulic a
lil
20-215
0
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