3 Description of the
Ruthmann-Steiger
BA.GB.12-27409-05-07-FTA-jr
3.1.1 Description of individual constructional components
3.1.1.1 Steiger-substructure
The Steiger-substructure consists of a welded base frame with cover. The
base frame is used as an auxiliary frame. It takes in connection with the
carrier chassis the boom loads occurring from the Steiger-operation and
passes them over the stabilizing jacks onto the ground. The rotating device
installed at the base frame is designated for rotating the boom. The hy-
draulic drive units, lines and control elements are mounted in or at base
frame. The base frame is covered by a special aluminium deck plate/cover.
For maintenance purposes and for manual operation of the solenoid valves
(emergency lowering) the covers can be removed.
3.1.1.2 Stabilizing jacks
The Ruthmann-Steiger including the chassis is lifted by mechanical-
ly/hydraulically actuated stabilizing jacks. There are moveable jack plates
at the stabilizing jacks, which can compensate slight unevenness of
ground. Yellow blinker lamps at the jacks shine as long as the jacks are ex-
tended and the ignition of the Steiger is switched-on.
3.1.1.3 Boom
The boom is the lifting device of the Ruthmann-Steiger. It is elevated
(„boom up“) and lowered („boom down“) by means of a lifting cylinder. The
boom consists of the following main constructural groups:
Turret
The turret welded as framework made of steel hollow sections is
situated above the Steiger-substructure. It is the rotating column
of the boom. The rotating device is located on the turret plate. It
makes the connection to the Steiger-substructure. The rotating
device mainly consists of ball bearing slewing gear and a worm
gear with spring-loaded parking brake. The rotating device is driv-
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