POWER DIVIDER LOCK CONTROL (For Tandem Drive
Axles) (Air Operated)
A "rule-of-thumb" for gear selection is that the
operator should estimate the gear he would use to climb
The power divider lock control located below the
the grade he is about to descend.
instrument panel (left side) is used with vehicles
equipped with dual rear axles having interaxle
Generally this same gear can be used for controlled
descent of the hill with the Engine Brake.
For normal driving on hard surface roads the control
IMPORTANT: The engine should never be allowed
should remain in the "OUT" (unlocked) position.
to exceed the governed speed. Use the service
brakes intermittently or shift to a higher transmission
range to prevent engine overspeed.
Using an Engine Brake on ice or slick roads can be
very successful. The Engine Brake is a very gentle
retarder and can be used effectively on icy pavement by
selecting a higher than normal gear for the given road
speed. The engine will then operate at a reduced RPM
thereby reducing the retarding effect when the Engine
Brake is energized.
BRAKE PEDAL (Air Brakes)
When making a stop for a traffic light or going down
a long grade, do not "fan" the air brake pedal rapidly as
this wastes air pressure. On long grades, use snubbing
"on-off" brake application to reduce the possibility of
extreme heat and wear to the brake lining. Another
good policy to follow is to let the engine assist in
reducing the vehicle speed. The best way to make a
under heavy load when one or both wheels of the axle
stop is to apply the brakes as hard at first as the road
are slipping, the control should be in the "IN" (locked)
and load conditions will permit and then gradually reduce
position. A red warning light located beside the power
the pressure, so that at the end of the stop there is
divider lock indicates when the control is in locked
sufficient air pressure to hold the vehicle.
NOTE: Move control to "IN" (locked) position
only at low speed and never when wheels are