Maeda MC815C - Abnormal Sound or Vibration Is Generated from Winch Motor or Its Periphery; Wind-Down Cannot be Performed; Wind-Up Cannot be Performed

T-421
H-7 [Abnormal sound or vibration is generated from winch motor or its periphery]
Content Abnormal sound or vibration is generated from winch motor or its periphery
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1
Air remains in the circuit and
motor.
Vent the air in the circuit.
2 Generation of piping vibration Check the piping clamps tightening.
3 Winch motor operation fault Replace the winch motor
H-8 [Wind-up cannot be performed]
Content Wind-up cannot be performed
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1
Crane control valve winch
operation valve (spool)
operation fault
Check for crane control valve winch operation valve (spool)
operation faults
2
Winch 2-speed switch valve
operation fault
Check for winch 2-speed switch valve operation faults
3
Winch brake cancelation
valve operation fault
Check for winch brake release valve operation faults
4
Winch motor brake operation
fault
Check for winch motor brake operation faults
5 Winch motor operation fault Replace the winch motor
Note: When overhoist prevention device and overload prevention device are not operating by electric control
H-9 [Wind-down cannot be performed]
Content Wind-down cannot be performed
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1
Crane control valve winch
operation valve (spool)
operation fault
Check for crane control valve winch operation valve (spool)
operation faults
2
Winch brake cancelation
valve operation fault
Check for winch brake release valve operation faults
3
Winch motor brake operation
fault
Check for winch motor brake operation faults
4 Winch motor operation fault Replace the winch motor
5
Over un-winding detecting
limit switch operation fault
Check for operation faults with the over un-winding detecting
limit switch