T
ransmission
9803/3280
Issue
2*
2
7-2
2
7-2
Systems
Description
Section
F
Section
F
Synchro Shuttle Gearbox
2/4 Wheel Drive Clutch Operation
- Pressure ON/Spring OFF Type (cont’d)
2 Wheel Drive Operation
When the switch is in the 2 wheel drive position,
solenoid valve
A
is de-energised. With the solenoid
A1
de-energised, the valve spool moves under the
force of the spring
A2
. The oil supply to the piston
C
is blocked (shown at port
3
). At the same time oil
vents from the back of piston
C
to the sump via
ports
1
and
2
.
Because there is no pressure behind piston
C
, the
friction/counter plates of clutch pack
B
now freely
rotate on the output shaft, thus disengaging drive
to the front axle.
A406210