Operation and maintenance manual

Section 120-0010
Transmission - Transmission and Mounting
SM 2124 Rev 3 8-03
4
intersection of the clutches to be engaged and
disengaged becomes possible. This creates fast
shiftings without traction force interruption.
Speedometer Sensor
Speedometer sensor, within the ECU, sends a signal to
the speedometer, via the speedometer frequency
divider, to indicate travel speed in kilometres per
hour and miles per hour.
Differential Locks
Note: The transmission differential lock requires
hydraulic pressure to hold it 'Off', whereas, the centre
axle differential lock requires pressure to hold it 'On'.
When the engine is started, hydraulic pressure is
applied to the transmission differential lock to ensure
the differential lock is released. On activation of the
differential lock switch, the transmission differential
lock solenoid is energised and hydraulic pressure is
released at the transmission differential lock and
applied at the centre axle differential lock (TA40 only).
In this condition, the differential locks are engaged.
Note: The differential locks can be preselected when the
machine is moving however, they will only engage on the
move when the vehicle speed is below 5 km/hr.
Note: Before driving in soft or slippery conditions, stop
and engage the differential locks. Spinning wheels can
result in damage to the transmission and axle
differentials.
Note: Disengage differential locks when driving on firm
ground.
Retarder Control
The hydro dynamic retarder is arranged between the
engine and torque converter so that a good braking
effect is obtained in all speeds. The retarder is a
wear resistant hydrodynamic brake with speed
dependent action.
Retarder solenoid is energised on application of the
retarder switch, located either on the right hand dash
panel or within the treadle valve, provided that the
lockup clutch is engaged and the transmission 'Stop'
warning light is OUT. Energising retarder solenoid will
shift retarder solenoid valve and allow oil to flow
through the valve to engage the retarder.
Pressing the retarder switch OFF will de-energise
retarder solenoid and retarder solenoid valve will shift
back to disengage the retarder.