Heavy Lift Function Does Not Operate Or Stop; Machine Push-Up Function Does Not Operate Or Stop; Boom Shockless Function Cannot Be Turned On Or Off - Komatsu Galeo PC800-8 Shop Manual

SEN00794-02
H-13 Heavy lift function does not operate or stop
Failure

• Heavy lift function does not operate or stop

phenomenon
Relative
information
Possible causes
and standard
value in normal
1
state
H-14 Machine push-up function does not operate or stop
Failure

• Machine push-up function does not operate or stop

phenomenon
Relative
information
Possible causes
and standard
value in normal
1
state
H-15 Boom shockless function cannot be turned ON or OFF
Failure

• Boom shockless function cannot be turned ON or OFF

phenomenon
Relative
information
Possible causes
Malfunction of boom shock-
and standard 1
less solenoid valve
value in normal
state
Malfunction of boom shock-
2
less valve
22
Cause Standard value in normalcy and references for troubleshooting
Check by (2) in "H-5 Boom speed or power is low".
Cause Standard value in normalcy and references for troubleshooting
Check by (3) in "H-5 Boom speed or power is low".
Cause
aPrepare with starting switch OFF, then carry out troubleshooting with
the starting switch ON.
Remove the solenoid valve from the valve assembly and connect the
connector and operate the boom shockless control switch. If the spool
moves at this time, the solenoid valve is normal.
Since the boom shockless valve may have a malfunction, check it
directly.
Standard value in normalcy and references for troubleshooting
40 Troubleshooting
PC800, 850-8