Transmission
9803/3280 Issue 1
27 - 3 27 - 3
Systems Description
Section F Section F
Synchro Shuttle Gearbox
2/4 Wheel Drive Clutch Operation
- Spring ON/Pressure OFF Type
4 Wheel Drive Operation
This clutch is of the ‘Spring-ON (4WD)/Pressure-
OFF (2WD)’ type. The clutch is engaged and
disengaged by introducing or dumping pressurised
oil behind piston C via a solenoid valve A. The
solenoid valve is operated by a switch in the cab.
When the switch is in the 4 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
clutch friction/counter plates of clutch pack B are
forced together by disc springs D, thus driving the
output yoke E.
To Next Page
Loading...
Need help?
General
