Malfunctions during crane operation
14.2 What to do when a malfunction occurs during crane operation
Operating manual GMK 6400 3 112 993 en 14 - 3
12.07.2013
14.2 What to do when a malfunction occurs during crane
operation
If a malfunction occurs:
• Keep calm.
Load can be
lowered
• Set down the load. Retract the main boom completely and set it down on
the main boom rest.
If it becomes necessary to override the RCL, observe all the information in
the section titled
RCL override; Ã p. 11 - 40.
If it is no longer possible to operate the crane from the crane cab, you can
use the emergency activation, if necessary;
à Emergency operation with the hand-held control, p. 14 - 55,
à Hydraulic emergency operation, p. 14 - 59.
• Lock the truck crane to prevent unauthorised use. Remove the ignition key
and lock away the hand-held control.
• Inform your supervisor.
• Try to eliminate the malfunction. Inform Manitowoc Crane Care if you
cannot correct the malfunction.
Load cannot be
lowered
• Secure the danger zone using cordons and warning signs.
• Notify Manitowoc Crane Care.
G
Risk of accident when carrying out repairs with loads lifted
Repairs must not be carried out as long as a load is lifted.
Always try to lower the load before carrying out repairs.
Only properly qualified personnel may perform crane movements with the
solenoid valves.
G
Risk of accident due to overridden or faulty RCL
You may only override the RCL if it becomes absolutely necessary in the
event of an emergency. This is to put the truck crane into a safe state in the
event of a malfunction. In this case, do not perform any movements that
would increase the load moment.
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