Malfunctions during crane operation
14.2 What to do when malfunctions occur during crane operation
14 - 2 3 302 633 en Operating Instructions GMK5250L
27.09.2017
14.2 What to do when malfunctions occur during crane
operation
Pay attention to the following points if a malfunction occurs:
• Keep calm!
The load can be
set down
• 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 RCL override section;
à RCL override – version A, p. 10 - 63,
à RCL override – version B, p. 10 - 67.
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 - 41,
à Hydraulic emergency operation, p. 14 - 47
• 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. Contact Manitowoc Crane Care if you
cannot correct the malfunction.
Load cannot be set
down
• Secure the danger area using cordons and warning signs.
• Notify Manitowoc Crane Care.
G
Risk of accidents 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 accidents 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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