ENGINE OPERATION - Operating Instructions 1 percent engine braking. In the down (LOW) position there will be 33 percent engine braking. Driving CAUTION Introduction and important information about operating your vehicle safely. 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. 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. 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 35 . 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. Compression on\off Engine Compression Brake Level Switch Operation How to operate the compression brake.
Compression setting 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 Check the engine oil pressure and engine coolant gauges, warning lamps, and other gauges daily to make sure they are 20 Y53-1183-1E1 (04/16/18)