Claas QUANTUM 2500 K, Service Parts

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Hydraulics QUANTUM TIC
11-20 10/04
2.1 3500K, 2500K, 3800K
2.1.1 Circuit Diagram 1 2/2 way raise/lower pick-up directional solenoid valve
2 2/2 way raise/lower articulated drawbar directional solenoid valve
3 2/2 way raise/lower knife frame directional solenoid valve
4 2/2 way dry crop top type P directional solenoid valve
5 2/2 way raise/lower tailgate directional solenoid valve
T Tractor
7 Pump with pressure relief valve
8 4/3-way valve
9 3/3-way valve
10 Hydraulic motor 100 cm³
12 One-way restrictor valve
13 Oil pressure switch 30 bar (knife frame up), not on 2500 K
14 Dry crop cylinder
15 Articulated drawbar cylinder
16 Hydraulically pilot-controlled non-return valve (lock-up valve unit)
17 Accumulator 40 bar (second accumulator added on serial no.)
19 Tailgate cylinder
20 Knife frame cylinder
21 Raise / lower pick-up cylinder
Swing up the knife frame
- Press the key
The cylinders (20) are actuated in order to swing up the cutting frame.
In this process a pressure is built up that is detected by oil pressure
switch (13). When the pressure rises above 30 bar, the oil pressure
switch is actuated and directs the signal to the CCT (
C LAAS C ontrol
T erminal).
The signal from the oil pressure switch overrides the reed switch signal
so the knife frame can completely swing up. Otherwise the knife frame
would only swing up to the reed switch position.