DEUTZ-FAHR AGROTRON 106 MK3, Workshop Manual

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5.6 AUXILIARY SERVICES CONTROL VALVE
VERSION WITH FIXED DISPLACEMENT PUMP
FUNCTION
•
The function of the auxiliary services control valve is to control the flow of pressurised oil to the auxiliary services and
the rear lift.
•
This control valve is a parallel circuit valve, which means that all the services receive oil flow simultaneously .
DESCRIPTION
•
The pressurised oil from the pump (1) enters the inlet section (2); from here it is distributed to the spool sections
through internal passages.
•
In the inlet section (2) we find an input gauge (8) and a relief valve (3) for LS-signal.
•
The input gauge adjusts the pressure to supply the auxiliary valves (6) in this way, that it is always corresponding to
the spring force (9) higher than the pressure of the LS-signal.
•
The pressure limitation is provided by limitation of the LS-signal pressure, done by valve (3).
•
All the spools, when operated, generate a pressure signal (Load Sensing signal) that is equal to the pressure demand
from each load.
The highest of these pressure signals, selected by the bistable valves (4), is directed to the pressure relief valve (3).
•
On the lift spool section there is an antishock valve (5) (on the UP control side) that serves to prevent excessive
pressure caused by jolting of the implement.
1
3 4 4 4
2 6 7 6
9
8
R
P
R1
A
B A
X
X
F
1
0
2
S
H
Y
F
1
0
2
B A
D0004990
5
REAR GEARBOX
HYDRAULIC SYSTEM AUXILIARY SERVICES CONTROL VALVE (Version with fixed displacement pump)