6.20 TROUBLESHOOTING M A E D A Crawler Crane
6-108 5/2020 CC1908S-1
SAFETY DEVICES
Abnormal phenomenon Main causes Corrective action
The crane operation does not stop
even when overloaded.
Communication fault,
controller fault
Inspect/replace (★)
Defective override switch
Inspect/replace (★)
Defective wiring
Inspect/repair (★)
Defective solenoid valve and
control valve
Repair/replace (★)
Extension, hoisting, and lowering
operations are not possible even
though there is no overloading.
Defective wiring
Inspect/repair (★)
Defective solenoid valve and
control valve
Repair/replace (★)
Defective controller
Inspect/replace (★)
Extension and hoisting operations
do not stop even when overwound
(buzzer sounds).
Defective override switch
Inspect/replace (★)
Defective ground
Inspect/repair (★)
Extension and hoisting operations
do not stop even when overwound
(buzzer does not sound).
Defective overwinding detector
Inspect/replace (★)
Extension and hoisting operations
are not possible even though there
is no overwinding (buzzer sounds).
Defective overwinding detector
Inspect/replace (★)
Overwinding detector wire
damage or entanglement
Inspect/repair/replace (★)
Damage to overwinding
detector weight
Inspect/replace (★)
Defective wiring Inspect/repair (★)
Extension and hoisting not possible
even though there is no
overwinding (buzzer does not
sound).
Defective solenoid valve and
control valve
Repair/replace (★)
Defective wiring
Inspect/repair (★)
Crane operation always stops
under certain conditions.
Working range restriction
operation
Cancel restriction.
Incorrect limit switch
adjustment
ADJUSTMENT
The working status lamp does not
illuminate.
Defective
Inspect/repair (★)
Blown fuse Replace
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