3
Description of the
Ruthmann-Steiger
BA.GB.12-27409-05-07-FTA-jr
RUTHMANN-Steiger
®
TB270
3-5
3.2
Hydraulic System
The movements of the Ruthmann-Steiger are made mechanical-
ly/hydraulically. A hydraulic pump installed at the power take-off of the ve-
hicle engine supplies the hydraulic energy. Electromagnetic way valves
control the extension and retraction of the hydraulic cylinders. The speeds
of the movements are regulated hydraulically by means of proportional
valves. Pressure relief valves are installed in order to secure the hydraulic
system. Hydro locks installed directly to the hydraulic cylinders prevent the
working cage from collapsing in case of pipe or hose burst.
A return filter installed in the hydraulic oil tank protect the hydraulic aggre-
gate against soil particles by filtering of the complete stream of the re-
turned oil. The ventilation filter integrated in the filter housing ensures filter-
ing of the drawn in air and avoids impermissible variations of pressure in
the tank.
In case of a failure of the drive or the power take-off, an emergency lower-
ing of the working cage by means of hand pump laterally installed on the
right side beneath the switch box at Steiger-substructure is possible. Then
the hydraulic energy is produced by a manual actuation of the pump.
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