operators_manual

WARNING
DO NOT use an exhaust brake when
driving bobtail or
with an unloaded
trailer. There may not be enough
weight on the rear axle to provide trac-
tion. This could cause a loss of control
and jackknife resulting in an injury ac-
cident. Make sure the exhaust brake is
switched “OFF” when bobtailing or
with an unloaded trailer. Failure to
comply may result in death, personal
injury, equipment or property damage.
CAUTION
Never exceed governed engine speed
because engine damage
can occur.
Operating engine beyond the gov-
erned speed causes additional strain
on valve train and internal engine com-
ponents. Operate the engine within
governed engine speed.
NOTE
Once you have determined what the
safe speed is
for your vehicle, operate
the engine brakes with the transmis-
sion in the lowest gear that will not
cause the engine speed to exceed the
rated engine speed. The optimum
braking power of the engine brakes is
reached at rated engine speed. Cor-
rect gear selection, therefore, is criti-
cal.
The selector switch can be used to vary
braking power as road conditions change.
Vehicle service brakes must be used when
additional braking power is required.
Slow Down Around Curves
25
MPH
The engine brake is NOT intended as the
primary brake for the vehicle, nor is it an
emergency brake. The engine brake only
helps the service brakes by using pressure
to slow the drivetrain. Use the service
brakes for quick stops.
Braking Truck on Grade
ENGINE OPERATION - Operating Instructions
Y53-1166-1G1 (08/2018) 25
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