Rigging work
12.3 Rigging work after driving with a dolly
Operating manual 3 302 736 en 12 - 21
GMK4090
xx.xx.xxxx
12.3.3 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.
• 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.
S
Danger of the hydraulic oil overheating
Always switch the valve
IV (Ã p. 12 - 19) over (lever in horizontal position)
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).
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