Rigging work
12.3 Rigging work after driving with a trailer
Operating manual GMK 6400 3 112 993 en 12 - 19
12.07.2013
12.3.3 Switching off boom pre-tensioning
You must switch off the boom pre-tensioning before you raise the main
boom off the trailer.
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 - 17
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).
Valve
III stays closed – the lever (3) points
downwards.
S
Danger of the hydraulic oil overheating
Always switch the valve
IV over (lever in horizontal position) before oper-
ating the crane.
This prevents the pressure in the hydraulic circuit from rising and the
hydraulic oil from exceeding the permissible temperature of 80 °C (176 °F).
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