TIC QUANTUM Hydraulics
10/04 11-15
The pressure in the tractor’s hydraulic system is limited e.g. to 200 bar in
order to prevent component damage. This function is ensured by pressure
controller (9).
During normal operation (working pressure < max. pressure), the pressure
controller (9) is pushed to the right up to the stop by compression spring
(24).
When e.g. a control unit is actuated and the cylinder reaches its limit
position, the load pressure at input (7) rises until it is equal to the pressure
at the pump output (20).
Under such pressure conditions:
• the volume flow controller (8) is pushed to the right up to the stop
by compression spring (21).
• the pressure controller (9) is pushed to the left up to the stop
against compression spring (24).
This movement occurs at a pressure of e.g. 200 bar. The control
edge (26) is now opened, enabling the pump pressure to act upon
the top face of the control ram (14). The swash plate (17) is now
actuated against the control spring (15) to its end position “Min.
delivery”.
The LS pump now delivers the lowest volume flow against the maximum
pressure.
The hydraulic system remains at the max. pressure level as long as the
additional control unit is set to the neutral position.
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