ENGINE OPERATION - Operating Instructions 1 To reduce vehicle speed, put the engine brake ON/OFF switch in the "ON" position. Remove your foot from the accelerator pedal and clutch pedal. The engine brakes will immediately begin to operate, slowing the vehicle. For operation on dry and relatively flat surfaces, when greater retarding power is not required, put the two-position selector switch in the "LOW" position. For operation on dry pavement when maximum retarding power is required, put the three-position selector switch in the "HI" position. pressure to slow the drive train. You must use the service brakes for quick or emergency stops.
Failure to comply may result in death, personal injury, equipment or property damage. 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. "Control speed" is the speed at which the forces pushing a vehicle down a grade are equal to the forces holding it back. CAUTION Do Not Exceed Governed Engine Speed 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 Spcifications.
20 30 40 50 60 1 3 5 20 30 40 50 60 1 3 5 10 R MPH 0 80 MPH 0 70 2 2100 2300 4 10 80 70 2 4 R Operating on Grades and Dry Pavement Tips for driving on grades and dry roads. OK OK RPM RPM WARNING The engine brake is not intended as the primary brake for the vehicle, nor is it an emergency brake. The service brakes must be used in an emergency. Relying solely on the engine brake to stop the vehicle in an emergency could cause an accident and lead to personal injury. The engine brake only helps the service brakes by using WARNING Do not use the engine brake when op- erating on road surfaces with poor traction (such as wet, icy, or snow cov- ered roads or gravel).
Retarders can cause the wheels to skid on a slippery 24 Y53-1166-1G1 (08/2018)