Paccar PX 8, Operator'S Manual

Page: 43 / 94

Operating Instructions
PACCAR Y53-1030A 12/09
– 37 –
To reduce vehicle speed, put the engine brake on/off switch
in the ON position. Remove your foot from the accelerator
pedal and clutch pedal. The engine brakes will immediately
begin to operate, slowing the vehicle.
For operation on dry pavement when maximum retarding
power is required, put the two-position selector switch in the
HI position.
For operation on dry and relatively flat surfaces, when
greater retarding power is not required, put the two-position
selector switch in the LOW position.
Tips for Operation on Grades with Dry
Pavement
WARNING! The engine brake is not intended as
the primary brake for the vehicle, nor is it an
emergency brake. The service brakes must be
used in an emergency. Relying solely on the
engine brake to stop the vehicle in an emer-
gency could cause an accident and lead to per-
sonal injury. The engine brake only helps the
service brakes by using pressure to slow the
drive train. You must use the service brakes for
quick or emergency stops.
WARNING! Do not use the engine brake when
operating on surface with poor traction (such as
wet, icy, or snow covered roads). Retarders can
cause the wheels to skid on a slippery surface.
You could lose control of the vehicle and jack-
nife if the wheels begin to skid, resulting in an
accident.