User Manual
Table Of Contents
- Content
- 1 Overall hydraulic system
- 2 Steering hydraulics
- System concept
- Fully hydraulic steering (Emergency steering)
- Orbitrol axle = Floating axle (1), the rigid axle (2) is tracked by electro-hydraulic means
- Orbitrol axle = Rigid axle (2), the floating axle (1) is tracked by electro-hydraulic means
- The floating axle (1) and the rigid axle (2) are steered electro- hydraulically - the Orbitrol steering circuit is closed.
- Steering valve VI
- 3 Working hydraulics
000 293 646 0 - SYS-H XERION 3300 - 04/05 25
1 Overall hydraulic system
PFC pump
391
Description of function The pressure in the hydraulic system is limited to 200 ± 5 bar in order to prevent
component damage. This function is ensured by pressure controller (773).During
normal operation (working pressure < max. pressure), the pressure controller
(773) is pushed to the right by compression spring (24). Under such pressure
conditions:
– ·the volume flow controller (772) is pushed to the right by compression
spring (21).
– ·the pressure controller (773) is pushed to the left against compression
spring (24).
This movement occurs at a pressure of 200 ± 5 bar. The control edge (26) is now
opened, enabling the pump pressure to act upon the top face of the variable-
displacement pump hydraulic cylinder (377). The swash plate (17) is now
actuated towards "Min. pump capacity" against the control spring (15). This
takes 8 – 10 milliseconds. The PFC pump now pumps the smallest volume flow
against the maximum pressure of 200 ± 5 bar. The max. pressure can be set
using the set screw (23). The hydraulic system remains at the max. pressure
level until the control unit is actuated in neutral position or until the load on the
LS line is relieved at input (7).