Claas QUANTUM 2500 K, Service Parts

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Hydraulics QUANTUM TIC
11-54 10/04
3.4 4/3 way solenoid valve (knife frame, raise/lower articulated drawbar)
Key to diagram
5 3/2 way open knife frame solenoid valve
6 3/2 way close knife frame solenoid valve
7 3/2 way open tailgate solenoid valve
8 3/2 way close tailgate solenoid valve
9 3/2 way tailgate pressureless solenoid valve
10 3/2 way lower articulated drawbar solenoid valve
11 3/2 way raise articulated drawbar solenoid valve
19 3/2 way tailgate pressure solenoid valve
60 Lock-up valve unit
A1 Working cylinder
A2 Working cylinder
B1 Working cylinder
B2 Working cylinder
P Pump
T Tank
K Ram
Function
Neutral The solenoid coils are without voltage.
Oil is applied at port P.
The oil from the working cylinder is available at the non-return valves of
lock-up valve unit 60, ports A1/A2 and B1/B2. The valves are closed, the
oil is consequently trapped.
Open knife frame or raise
articulated drawbar
(see also circuit diagram) The master valve (14) controls the pressure build-up and solenoids 5 or
10 switch (12 Volt).
The pilot spool of solenoid valves (5) or (10) opens the ball. Oil flows from
P to the lock-up valve unit 60 via the ball.
The right non-return valve is opened by ram K when pressure is built up.
The return line from the hydraulic cylinders to the tank is free. The oil
flows to the hydraulic cylinders via the left non-return valve A1/A2.
The hydraulic cylinders extend.
The displaced oil flows back to the tank via pilot spool 6 or 11.
Close knife frame or lower
articulated drawbar Opposite function.