4.2 Hydraulic supply
Drive
The battery tools are powered by a 28 V DC motor. When the tool is switched on, the motor
idles. Only when the control lever is operated the motor start to run at a higher speed.
Pump
The hydraulic pressure is generated by a high-pressure hydraulic pump (in the pumping unit).
The pump is an swash plate axial piston pump with four pistons. The pressure operates directly
on the working cylinder, making connection lines unnecessary.
Oil tank
The volume of oil for operation is taken from an accumulator. This means the entire hydraulic
system is completely closed and void of air. Any possible volume expansion due to heat is
balanced by the accumulator.
Hydraulic oil
All battery-powered devices should use a special hydraulic oil for rescue equipment
in accordance with WN 4841751. Normally the oil does not have to be changed, but, if this
becomes necessary, it can be changed only by service engineers 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!
Design and function | 25