Control Block - Claas QUANTUM 3500 Service Parts

Hydraulics
3.3

Control block

Note:
Pressure balance,
pressureless circulation,
solenoids not activated.
Example: Fixed
displacement pump
11-50
QUANTUM
12 4/3 way reverse floor conveyor solenoid valve
14 3/2 way master valve solenoid valve
20 Pressure balance
21 Pressure relief valve 200 bar
22 Shut-off valve
23 Shut-off valve
24 Restrictor
25 4/3 way floor conveyor forward proportional solenoid valve
39 Load sensing port
A Working line
B Working line
P Pump port (feed line)
T Tank port (return line)
Constant flow to motor = 28 l/min.
Protection by pressure relief valve on tractor.
Depending on the type of pump and/or tractor, the shut-off valves 22 and
23 must be set as follows:
Constant-pressure pump:
Fixed displacement pump: 22 open
Load sensing pump:
Shut-off valve 22 is open, shut-off valve 23 is shut off and LS port 39 is
closed.
The control spool of pressure balance 20 is connected with P. The spring
space is connected with the closed shut-off valve via restrictors 24.
The control spool of pressure balance 20 moves against the spring, thus
releasing a large cross-section towards T.
The pump circulation pressure is approx. 7 bar.
The restrictor combination 24 defines the pressure ratios at a max. flow
rate of 65 l/min. at the proportional 4/3 way solenoid valve 25.
22 shut-off 23 open
23 shut-off
22 shut-off 23 open = connect LS control
TIC
line to port 39
10/04