Maeda MC815C - Overrun after Stop of Slewing Is Significant

T-429
H-26 [Significant overrun after slewing stop]
Content For both of left and right sides, overrun after stop of slewing is significant.
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1
Crane control valve - slew
operation valve (spool)
malfunction
• Check for malfunction in crane control valve - slew operation
valve spool
Slew lever: at neutral
Output pressure: 0 Mpa [0 kg/cm
2
]
Slew lever: when operating
Pilot pressure: 3.1 Mpa [32 kg/cm
2
] or more
2 Slewing motor fault • Check for malfunction of slewing motor’s slewing brake parts
3 Slewing reducer fault
• Check for slewing reducer malfunctions
(May be assessed by presence of abnormal sounds or
heating, metal powder contamination in lubricating oil, etc.)
Content Overrun after stop of slewing is significant for only one side.
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1
Crane control valve - slew
operation valve (spool)
malfunction
• Check for malfunction in crane control valve - slew operation
valve spool
Slew lever: at neutral
Output pressure: 0 Mpa [0 kg/cm
2
]
Slew lever: when operating
Pilot pressure: 3.1 Mpa [32 kg/cm
2
] or more
2 Slewing motor fault • Check for malfunction of slewing motor’s slewing brake parts
3 Slewing reducer fault
• Check for slewing reducer malfunctions
(May be assessed by presence of abnormal sounds or
heating, metal powder contamination in lubricating oil, etc.)