TROUBLESHOOTING
H-l 7, H-l 8, H-l 9
H-17 In swing + boom RAISE, boom RAISE is slow
* If swing and boom RAISE work normally when operated independently.
* Carry out troubleshooting with the swing priority mode OFF.
Cause
T
solenoid valve
* Min. 2.74 MPa
(Min. 28 kg/cm*) p
- Operate boom
RAISE (operate
lever slightly)
Defective operation of LS
select valve
2 YES
Defective operation of LS
Does LS shuttle
select solenoid valve
- valve move
’ smoothly?
Defective operation of LS
NO
shuttle valve (LS shuttle for
boom RAISE, LS select)
Remedy
Repair or
replace
Repair or
replace
Repair or
replace
H-18 In swing + arm OUT, arm OUT is slow
* See H-17
(
If the operation is normal when the swing and arm OUT are operated independently, carry out trouble-
shooting with the swing Priority mode OFF. If the Cause column shows that there is defective operation of
the LS shuttle valve, the cause is in the shuttle valve for the arm OUT and LS select.
H-19 In swing + travel, travel speed drops excessively
If the operation is normal when the swing and travel are operated independently. carry out troubleshooting
with the swing priority mode OFF. If the Cause column shows that there iS defective operation of the Ls
shuttle valve,_the cause is in the shuttle valve for the LS select.
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