"Control speed" is the speed at which the
forces pushing a vehicle down a grade are
equal to the forces holding it back.
Do Not Exceed Governed Engine Speed
OK
OK
RPM
2100
2300
1
2
33
4
5
R
RPM
1
2
3
44
5
R
MPH
0
10
20
30
40
50
60
70
80
MPH
0
10
20
30
40
50
60
70
80
WARNING
DO NOT use the engine compression
brake or exhaust brake when operat-
ing on road surfaces with poor traction
(such as wet, icy, or snow covered
roads, or gravel). The engine com-
pression brake or exhaust brake can
cause the wheels to skid on a slippery
surface. You could lose control of the
vehicle and/or jackknife if the wheels
begin to skid, resulting in an accident.
Failure to comply may result in death,
personal injury, equipment or property
damage.
CAUTION
The engine ECM maintains a record of
maximum rpm. Exceeding the maxi-
mum rpm will be considered driver
abuse and will affect the engine war-
ranty. See Engine Specifications.
WARNING
DO NOT operate the engine compres-
sion brake or exhaust brake when driv-
ing/operating your vehicle bobtail or
with a loaded or unloaded trailer on
road surfaces with poor traction (wet,
icy, or snow covered roads) or in
heavy traffic. There may not be
enough weight on the rear axle to pro-
vide traction. Braking caused by the
normal operation of the engine com-
pression brake or exhaust brake could
cause you to lose control of the vehi-
cle, resulting in an accident. Make
sure the engine compression brake or
exhaust brake is switched "OFF" when
driving bobtail 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 the engine beyond the gov-
erned speed causes additional strain
on valve train and internal engine com-
ponents. Operate the engine within
governed engine speed.
ENGINE OPERATION - Operating Instructions
26 Y53-1166-1M1 (10/2020)
1
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