ENGINE OPERATION - Operating Instructions 1 you may see it when the engine grid heater is on and needs some time to warm up. (PACCAR PX and Cummins ISL engines) and tear on the service brakes. However, the engine compression or exhaust brake is not an emergency brake or the primary vehicle brake. brake alone might not stop the vehicle fast enough to prevent an accident. The engine compression brake is NOT intended as the primary brake for the vehicle, nor is it an emergency brake. The engine compression brake only helps the service brakes by using en- gine back pressure to slow the drive- train. Use the service brakes for quick stops.
You could be seriously injured if you relied only on the engine compres- sion brake to stop the vehicle in an emergency. Failure to comply may re- sult in death, personal injury, equip- ment or property damage. NOTE WARNING Some engines are equipped with an engine starting motor protection fea- ture. If the starting motor is engaged for 30 or more seconds, without the engine starting, the starter will be locked out from operating, allowing for proper cooling of the starting motor. During this time, the 'Wait-To-Start' lamp will flash for 2 minutes. Once the lamp stops flashing, the starting motor will be allowed to function.
DO NOT operate the engine compres- sion brake when driving/operating your vehicle bobtail or with a loaded or un- loaded trailer on road surfaces with poor traction (wet, icy, or snow cov- ered roads) or in heavy traffic. There may not be enough weight on the rear axle to provide traction. Braking caused by the normal operation of the engine compression brake could cause you to lose control of the vehi- cle, resulting in an injury accident. Make sure the engine brake is switch- ed "OFF" when bobtailing or with an unloaded trailer. Failure to comply may result in death, personal injury, equip- ment or property damage.
CAUTION Engine Braking System Information on using the engine braking system. DO NOT operate the engine brake un- til the engine oil temperature is above 86°F (30°C). Operation below 86°F (30°C) could cause severe damage to the engine. Idle the engine four mi- nutes at approximately 1,000 rpm to warm the engine before activating the engine brakes. An engine compression brake is standard on the PX-7 engines. Optionally, this engine may be equipped with an exahust brake. When activated, these devices create a braking effect on the drive wheels. Because it can help keep your vehicle’s brakes from overheating, it can save wear WARNING The service brakes must be used in an emergency.
The engine compression 18 Y53-1183-1E1 (04/16/18)