Manitowoc Grove GMK 4100L-1, Operating Manual

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Crane operation
11.5 Crane operation with main boom
Operating manual 3 302 690 en 11 - 75
GMK4100L-1
2
3
.1
1.
201
7
11.5.2
Main hoist
You can reeve the hoist rope of the main hoist on the main boom or on the
lattice extension.
You can have the operating hours ( 1 ) of the hoist displayed;
à
p. 11 - 133.
s
G
Risk of accidents from accidentally operating a hoist
Always switch off the hoist that is not in use.
Never operate the hoist if the hook block is unreeled and the hoist rope is
completely wound onto the drum.
– The rope will slacken in the course of the
Lower
movement. Rope loops
will form, which can cause the load to slip and damage the hoist rope.
– The switch-off point of the lowering limit switch shifts in the course of the
Raise
movement. The lowering limit switch will lose its function as a
safety device.
G
Risk of accidents when raising loads at an angle
Loads can cause the main boom to bend, resulting in the hoist rope no
longer being aligned in a vertical position. Compensate for the bend by
lowering the boom so that the load will be lifted vertically. In this way,
you can prevent the load dragging and helpers being injured.
Inform all helpers about this issue.
G
Danger due to slack rope!
Only use hook blocks and lifting gear of the minimum weight prescribed in
the
Lifting capacity table
, depending on the reeving and boom length. This
prevents slack rope developing at large heights when lifting without a load.
This can result in the load slipping during subsequent lifting procedures.