Service Manual
Hako GmbH
Technical Service (KUD) 23843 Bad Oldesloe
Edition: 05/2014
Confidential - For internal use only!
5.2.1 Hydraulic Diagram V/D-Version Driving
As soon as the engine runs, the feed pump delivers hydraulic fluid into the driving circuit. The fluid is available in the complete circuit
and comes in at the pressure-limiting valves (forward and reverse) as well as at the feed pressure valve. Since feed pressure
adjustment is the lowest, this valve opens and the driving circuit features a pressure of 3.8bar + 0.2bar when the engine is running.
When the drive pump is mechanically shifted to forward (A) or reverse mode (B), a fluid circulation into the specific direction is
generated and, depending on the drive motor resistance, a driving pressure builds up in the circuit. After this pressure attains the
160bar (forward) or the 130bar (reverse), the pressure-limiting valve opens accordingly and protects driving.
Reverse
Forward
Drive motor
160ccm/U
Drive pump 10ccm/U
