Crane operation
10.1 Before operating the crane
10 - 12 3 302 633 en Operating Instructions GMK5250L
27.09.2017
Seat contact
switch
This check is carried out together with the dead man's switch.
Checks during standstill
• Do not sit down on the crane cab seat.
• Do not press any dead man's switch (1).
• Move the control levers one after the other for all the crane movements
and check whether all the crane movements are switched off.
Inspection during operation
– Dead man's switch
• Do not sit down on the crane cab seat.
• Press the right dead man's switch (1) and slowly lift the hook block.
• With the control lever actuated, let go of the right dead man's switch
and check whether the crane movement comes to a standstill within
approx. 3 seconds.
• Repeat the check with the dead man's switch on the left control lever.
– Seat contact switch
• Do not press any dead man's switch (1).
• Sit down on the crane cab seat and slowly lift the hook block.
• With the control lever actuated, stand up and check whether the crane
movement comes to a standstill within approx. 3 seconds.
If the dead man's switch system is not working correctly, do not start crane
operation but notify
Manitowoc Crane Care.
G
Danger of accident if the seat contact switch is faulty!
Always stand inside the crane cab when you do this check.
If you stand next to the crane cab, you may be pushed off the carrier if the
superstructure slews as a result of a faulty dead man's switch.
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