Malfunctions during crane operation
14.5 Emergency operations and programs
14 - 32 3 302 633 en Operating Instructions GMK5250L
27.09.2017
H
In the Telescoping emergency program, all functions for retracting the main
boom remain enabled as long as there are no other errors (hydraulic or
mechanical).
The speed is restricted to approximately 30% of the maximum speed.
If there is an error
on the length
indicator
First register the current status of the telescoping mechanism.
• Check the positions of the locking pins as
usual, i.e. at the symbols (1) and (2).
• Check that the display (3) shows the RCL
measured value for the extended length of
the telescoping cylinder
.
G
Risk of damage to the main boom!
Never telescope the main boom if at the same time there is an error at both
the length indicator and the proximity switch.
It would then not be possible for you to monitor operations, and compo-
nents in the main boom could be damaged, or a situation could arise in
which the main boom can no longer be extended or retracted.
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