Manitowoc Grove GMK4100L-1 Operating Manual page 702

Crane operation
11.5 Crane operation with main boom
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Risk of accidents due to overloading!
Make sure the lifted load is no more than 50% of the maximum load accord-
ing to the Lifting capacity table (maximum degree of utilisation of 50%)
before operating the hoists in high-speed mode.
Danger of slack rope with a lightweight hook block
If you switch on high-speed mode at high speeds, a light hook block will not
be able to keep the hoist rope taut if it is hoisted up high with a small
number of reevings and a large boom length.
Danger of slack rope with large number of reevings
If you switch on high-speed mode with a large number of reevings and
without a load, slack rope may form because the hook block is lowered too
slowly due to the high degree of friction.
To switch on briefly
•
Press the button at the right on – for (1).
High-speed mode will be active until you release the button.
Continuous operation
•
Press the button at the left on – for (2).
High-speed mode will be enabled until you press the button again.
The symbol (1) indicates the current status:
– On: High-speed mode switched on
– Out: High-speed mode switched off
The symbols show the direction of rotation of the hoist:
1 Lifting the hoist
2 Lowering the hoist
The speed of the hoists will only be significantly increased by switching to
high-speed mode if you have deflected the control lever by more than 70%.
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GMK4100L-1