DEUTZ-FAHR AGROTRON 106 MK3, Workshop Manual

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10-80
1 2
3
4
7
5
D0004980
A - A B -B
B
B
b
d
a
f
e
c
EF
CF
LS
6
HYDRAULIC SYSTEM GEAR PUMP FOR HYDRAULIC SERVICES AND STEERING (120-165 CV models)
COMPONENTS
1. Priority valve body
2. Pump housing
3. End cover
4. Input shaft
5 . Spool
6. Spring
7. Driven shaft
DESCRIPTION
The gear pump sends oil under pressure to the chamber a from where it is sent through the port CF to the power steering.
At the same time, the pressurised oil reaches chamber b of the spring (6) and the chamber c opposite the spring (6) through
the passage d .
As the LS line is sent to drain by the power steering, a small amount of oil (about 1 litre/min.) flows through the port LS .
This creates a pressure difference between the two sides of the spool (5) that is consequently pushed downwards, thereby
allowing the oil to flow to chamber
e and from there to the auxiliary services .
When the steering wheel is turned, the connection between the drain and the LS line is broken and the LS line is connected
to the delivery line to the steering cylinder. This nullifies the pressure difference between the two sides of the spool and
causes the spring to push the spool upwards, thereby allowing oil to flow from chamber
a to chamber f .