Paccar MX-11 - Page 30

NOTE
The longer or steeper the hill, the more
important it is to use your engine
brake. Make maximum use of your en-
gine brake by gearing down and letting
the engine brake do the work.
Shift to a Lower Gear on Grade
RPM
1
2
3
4
R
55
OK
2100
RPM
1
2
3
44
5
R
MPH
0
10
20
30
40
50
60
70
80
OK
MPH
0
10
20
30
40
50
60
70
80
2100
If frequent use of the vehicle service
brakes is required, it is recommended that
a slower control speed be used by
selecting a lower transmission gear.
Tips for Operation on Slick Roads
WARNING
To reduce the possibility of personal
injury or property damage, always al-
low for extra distance between your
vehicle and other objects when using
the service brakes or engine brakes on
slick roads.
The operation of any vehicle is difficult to
predict on slick roads. The first 10 to 15
minutes of rainfall are the most dangerous,
as road dirt and oil mixed with rain create a
very slippery surface.
WARNING
DO NOT use the vehicle’s engine
compression brake or exhaust brake in
any situation that requires an immedi-
ate stop and/or in situations of poor
traction (such as wet, icy, or snow cov-
ered roads). Trying to use the engine
compression brake or exhaust brake
instead of the service brakes may
cause a loss of vehicle control, which
may result in an accident involving
death or personal injury.
When driving on slick roads, start with the
“ON/OFF” switch in the “OFF” position and
the two-position selector switch in the
“LOW” position. 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 braking
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 compression brake or exhaust
brake. If traction is maintained using the
braking 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
compression brake or exhaust brake 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 compression brake or exhaust
brake is activated and more braking power
is required, move the two-position selector
switch to the “HI” position. Again, if the
ENGINE OPERATION - Operating Instructions
28 Y53-1166-1M1 (10/2020)
1