S
te
e
ri
n
g
9803/
3280
Issue
1
Priority Valve Operation 1
- Neutral
When the steering is not being operated, flow to the
steering circuit is dead ended by the closed centre
steering unit
43
and no load is sensed in line
LS
.
Pressure from the main pump to the priority valve is
fed via a drilling
2C
to the rear of spool
2B.
The
high pressure differential created across the spool
causes it to move to the left against the force of the
spring
2A
. This allows full pump flow to the loader
control valve
3.
Component Key:
LS
Load Sensing Port
P
From pump
T
To Loader Valve
2
Priority Valve
2A
Spring
2B
Spool
2C
Drilling
3
Loader Valve
43
Steer Unit
43B
Relief Valve
5 -
2
5 -
2
Cir
c
uit
D
e
sc
rip
tio
ns
S
e
c
tio
n H
S
e
c
tio
n H
