Hydraulic units can be filled cleanly and with precision with the transportable hand pump. An appropriate hose fitting with micro-filter inset is connected to the manual pump, creating a closed system. Fresh hydraulic oil is now pumped with the hand pump through the hose fitting into the oil container of the hydraulic unit, giving contamination no chance to get into the system. The transportable hand pump can also be used to auxiliary release brake actuators. For this purpose, the manual pump is adapted to the hydraulic auxiliary release connection.
Auxiliary release procedure is started by activation of the manual lever. The pressure which builds up is displayed on a manometer. A built in safety valve protects the hand pump, the hose line and the brake actuators connected from inadmissibly high loads: when the preset pressure value is reached, the safety valve opens the oil flow to the oil container so that the preset value cannot be exceeded.
The pressure value of the safety valve is set customer-specifically at the factory and must not be altered.