Ground drive hydraulics
MEGA
TIC
Description of function: High-pressure limitation
If the system pressure rises above the set maximum value, this overpressure is relieved to the feed pressure circuit by the ground drive multi-function valves (713/714). The high-pressure limitation should only respond for a short time during operation since the large oil flow which has to be displaced by the heavily pre-stressed valves would rapidly overheat the system.
Purging device
The respective high-pressure side in the high-pressure circuit actuates the ground drive purging shuttle valve (721) in the ground drive fixed displacement motor (210) so the corresponding low-pressure side has a connection to the motor housing via the ground drive purge pressure control valve (719). Since the pressure setting of the ground drive purge pressure control valve (719) is lower than that of the ground drive feed pressure relief valve (716), a constant oil quantity is exchanged by the ground drive feed pump (209) via the restrictor in the ground drive purge pressure control valve (719).
6-6
Me-h-Kap6
04/05
