Lukas R 430 - Manual (Page 12)

12
A B
Extend
piston
Retract
piston
5. Description of the functions
5.1 Description
The rescue rams are double-acting hydraulic cylinders. Extension / retraction are carried out
hydraulically. The direction of travel is controlled via a valve with star grip.
All rescue rams ensure full load-holding function when disconnected from the hydraulic
supply (e. g. when being unintentional decoupled; defective hose, and so on).
(For reasons of safety, rams R414 are internally safeguarded from 63 MPa = 630bar. When
the safeguarding valve responds a screeching noise can occur. Even if the screeching
noise occurs in unloaded condition, deactivate the equipment immediately and contact your
authorized dealer or LUKAS directly!)
5.2 Circuit diagram
To enable comprehension of the function, a simplifi ed circuit
diagram (hydraulic cylinder of the rescue equipment (A) +
hand valve (B) ) are depicted here.
5.3 Control of the operating movements
The piston movement is controlled via the star grip of the mounted valve.
(see cover, item 1 and, below, fi gure 3).
star grip
fi g. 3