Switching On The Boom Floating Position - Manitowoc Grove GMK4090 Operating Manual

6.3.2
G
G
H
Operating manual
GMK4090

Switching on the boom floating position

If the main boom has been placed on a dolly, the boom floating position
must be switched on so that the main boom can move up and down.
Risk of accidents from the boom floating position being switched off
Always switch on the boom floating position when the main boom is on a
dolly.
This prevents the full weight of the dolly briefly becoming suspended from
the main boom on uneven ground, the axle loads from rising suddenly, or
the truck crane from tipping when driving around corners.
•
Confirm the current rigging mode.
•
Fully retract the main boom.
•
Raise the main boom to a permitted angle within the working range.
•
Turn the superstructure to the 0° to the rear working position and place the
main boom on a dolly.
Risk of accidents from the main boom dropping down
You may only switch the boom to the floating position once the main boom
has already been set down on the dolly.
This prevents the raised main boom from dropping down.
Switching off the boom floating position;
•
Remove the padlock (2).
Switch over valve I – lever (1) upwards.
•
•
Secure the lever (1) with the padlock (2).
Switch the valve IV over – Lever (3) points
•
downwards.
The boom floating position is now switched on.
3 302 736 en
6.3 Rigging work for driving with a dolly
à
p. 12 - 19.
Driving modes
6 - 13