Kenworth T410, Driver'S Handbook Manual

Page: 211 / 418

CAT: 8612 November 2019 Page 185
OPERATING INSTRUCTIONS
DUAL RANGE AXLE OPERATION
The following are important tips on operating a Dual Range Axle with
Interaxle Differential:
1. Shift the axle with the interaxle differential in the UNLOCKED
position only.
2. When you are driving with poor traction, LOCK the differential.
When you have the differential locked, drive with the axle in LOW
range only.
3. When you are driving on a surface with good traction, keep the
interaxle differential UNLOCKED. You can drive with the axle in
the LOW or HIGH range.
4. Always UNLOCK the interaxle differential before shifting the axle
speed range.
If you shift the axle range with the interaxle differential in LOCK, you could
seriously damage the axles. Never shift the axle range with the differential
locked.
STARTING UP
1. Unlock the interaxle differential before starting.
2. Put the Range Selector in the LOW range. Shift the transmission
to start the vehicle moving.
3. When you are driving on rough terrain and secondary roads, or
under a very heavy load, keep the axle in the LOW range. Shift
the transmission to maintain correct road speed.
Never shift the axle when moving down hill. Engine driveline
disengagement may occur, eliminating engine retardation and
allowing the wheels to spin faster than the current speed of the engine.
This may require severe braking to slow the vehicle down and can
result in an accident.
Correct shifting of the axle depends on the synchronisation of engine/
driveline and wheel speed. When you shift the axle, the connection
between the engine and wheels is momentarily disengaged while the
gearing is synchronised. Normally when the axle is shifted, the speed of
the engine, axle and wheels adjust, allowing for proper gear engagement.