Rigging work
11.3 Rigging work after driving with a dolly
Operating Instructions GMK5250L 3 302 633 en 11 - 19
27.09.2017
11.3.3 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. 11 - 17.
The valves
II and III are located underneath
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 rising and the hydraulic
oil exceeding the permissible temperature of 80 °C (176 °F).
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