Switching Off Boom Pre-Tensioning - Manitowoc Grove GMK4100L-1 Operating Manual

12.3.3
S
Operating manual
GMK4100L-1

Switching off boom pre-tensioning

You must switch off the boom pre-tensioning before you raise the main
boom off the dolly.
To switch off boom pre-tensioning, you must bring the valves I to IV into
the required positions, which will empty the pressure accumulator.
Danger of the hydraulic oil overheating
Always switch the valve IV (
before operating the crane.
This prevents the pressure in the hydraulic circuit rising and the hydraulic
oil exceeding the permissible temperature of 80 °C (176 °F).
12.3 Rigging work after driving with a dolly
à
p. 12 - 19) over (lever in horizontal position)
•
Switch off the boom floating position;
à
p. 12 - 19.
The valves II and III are under the pressure
gauge (1).
Open valve II – the lever (2) is vertical.
•
The pressure accumulator is emptied. The
pressure on the pressure gauge (1) must
drop to 0 bar (0 psi).
The valve III stays closed – lever (3) is horizontal.
3 302 690 en
Rigging work
12 - 21