Paccar PX 8, Operator'S Manual

Page: 47 / 94

Operating Instructions
PACCAR Y53-1030A 12/09
– 41 –
If your tractor is equipped with a twin-screw rear axle,
position the power divider switch in the unlocked position.
Remove your foot from the accelerator pedal to make sure
the vehicle will maintain traction with the retarding power of
the engine alone.
If the vehicle drive wheels begin to skid or if there is a
fishtailing motion, do not activate the engine brakes.
f traction is maintained using the retarding power of the
engine alone and more braking power is required, switch the
two-position selector switch to the LOW position and activate
the engine brakes by switching the on/off switch to the ON
position.
If the vehicle’s drive wheels begin to skid or there is a
fishtailing motion, switch the on/off switch to the OFF
position.
If traction is maintained when the engine brakes are
activated and more braking power is required, move the two-
position selector switch to the HI position.
Again, if the vehicle has lost traction or if there is a fishtailing
motion, switch the on/off switch to the OFF position. Do not
attempt to use the engine brakes in the HI position.