Hydraulics QUANTUM TIC
11-84 10/04
4.2.8 Raise articulated
drawbar
Solenoid valves (12-M4), (16) and (28) are energized.
The volume flow from the pump (10 l/min.) flows to the hydraulic cylinders
(17) via port A of solenoid valve (12) and from there via solenoid valve
(28).
The backside build-up of pressure moves the spool (5) of circulation
valve (4) back against the volume flow from the pump.
The oil displaced from the hydraulic cylinders (17) flows back into the
tank via solenoid valve (16) and port B of solenoid valve (12).
The articulated drawbar is raised.
When the hydraulic cylinders hit their limit stop, the pressure relief valve
(8) opens. The spool (5) of the circulation valve (4) opens and the volume
flow from the pump flows back into the tank via the circulation valve (4).
When switching off, the solenoid valves (16) and (28) switch off first and
then, after a delay, the solenoid valve (12-M4).
4.2.9 Lower articulated
drawbar
Solenoid valves (12-M3), (16) and (28) are energized.
The volume flow from the pump (10 l/min.) flows to the hydraulic cylinders
(17) via port B of solenoid valve (12) and from there via solenoid valve
(16).
The backside build-up of pressure moves the spool (5) of circulation
valve (4) back against the volume flow.
The oil displaced from the hydraulic cylinders (17) flows back into the
tank via solenoid valve (28) and port A of solenoid valve (12).
The articulated drawbar is lowered.
When the hydraulic cylinders hit their limit stop, the pressure relief valve
(8) opens. The spool (5) of the circulation valve (4) opens and the volume
flows back into the tank via the circulation valve (4). When switching off,
the solenoid valves (16) and (27) switch first and then, after a delay, the
solenoid valve (12-M3).
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