Maeda MC815C - Page 366

T-420
H-6 [Wind-up/down speed is low or weak.]
Content Wind-up/down speed is low or weak.
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1
Winch brake cancelation
valve operation fault
Check for winch brake release valve operation faults
2
Winch 2-speed switch valve
operation fault
Check for winch 2-speed switch valve operation faults
3
Crane control valve winch
operation valve (spool)
operation fault
Check for crane control valve winch operation valve (spool) operation
faults
4
Crane high-speed solenoid
operation fault
• Check if there are operation faults with the crane high speed
solenoid (travelling / outrigger control valve)
5 Piston pump fault
Piston pump A3 port pressure measurement
Pilot pressure: 3.1 Mpa [32 kg/cm
2
]
6 Winch motor operation fault Replace the winch motor
[Location information]