operators_manual

CAUTION
Operating the engine with a compres-
sion brake that will not automatically
deactivate (i.e. when the dash switch
is OFF, clutch pedal is depressed or
throttle is applied) will cause severe in-
ternal engine damage. Do not operate
the engine if the compression brake
will not deactivate. Failure to comply
may result in equipment or property
damage.
Engine Compression Brake Level
Switch Operation
How to operate the compression brake.
There are two switches that control your
vehicle’s engine compression brake. One
switch turns the system ON/OFF and the
second switch controls the braking level.
These switches are located on the dash
switch panel.
For the three-position engine compression
brake level switch, there will be 100
percent engine braking when the switch is
in the up (HIGH) position. In the middle
(MEDIUM) position, there will be 66
percent engine braking. In the down (LOW)
position there will be 33 percent engine
braking.
With the compression brake switch ON, the
compression brake will be engaged when
the service brake is applied. If the cruise
control is operated in conjunction with the
compression brake, the compression brake
will engage to maintain the cruise set
speed.
Compression on\off
Compression setting
Driving
Introduction and important information
about operating your vehicle safely.
Correct care of your engine will result in
longer life, better performance, and more
economical operation.
Follow the daily maintenance checks listed
in Engine Maintenance on page 34 .
The new PACCAR engine associated with
this manual does not require a “break-in”
procedure. This section of the manual
provides all of the necessary information
required for proper engine operation.
Check the engine oil pressure and engine
coolant gauges, warning lamps, and other
gauges daily to make sure they are
ENGINE OPERATION - Operating Instructions
20 Y53-1185-1E1 (04/16/18)
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