STRUCTURE AND FUNCTION | 27
4.2 Hydraulic supply
Drive
The battery-operated appliances are powered by a 28 V DC motor. When the appliance
is switched on, the motor idles. Only when the rocker switch is operated does the motor start
to run at a higher speed.
Pump
The hydraulic pressure is generated by a high pressure hydraulic pump (in the pump unit).
The pump is a radial piston pump with 3-4 pump elements. The pressure is applied directly
to the working cylinder, which renders the connection lines redundant.
Oil tank
The oil volume for operation is taken from a tank. The entire
hydraulic system is therefore completely closed and free of air. Any possible
volume expansion caused by heat is compensated for by the tank.
Hydraulic oil
All battery-powered appliances should use a special hydraulic oil for rescue equipment
in accordance with WN61000137. The oil does not usually need to be changed, but we
recommend changing it after 10 years. An oil change can only be carried out by factory
servicing at WEBER RESCUE Systems.
CAUTION!
Do not attempt to carry out repairs on the hydraulic system!
The complete hydraulic system is designed as a closed circuit and must therefore be
completely free of air. For this reason, do not attempt to carry out repairs on the drive, to
ensure that no air can enter the system!
