Engines drops below 800 rpm, or the exhaust brake switch is turned off) is supplied. A A The manual mode does not require the cruise control switch to be on and operates the Pacbrake manually at the driver’s discretion. A The amount of braking power the engine will develop is related to the speed (rpm) of the engine. The higher the engine rpm, the greater the retarding power. Certain conditions may require that the transmission be downshifted in order to generate adequate rpm for the amount of retarding power required. Pacbrake exhaust brakes are designed and approved for safe use at 300 rpm above the engine’s maximum governed rpm. Refer to individual engine manufacturer’s specifications.
03/06/2000 f490228 A. Lubrication Point The Pacbrake will function best if it is used all of the time. However, if the vehicle is used inconsistently or seasonally, it may be necessary to perform a preventive maintenance procedure. Fig. 4.5, Pacbrake Exhaust Brake and Air Cylinder NOTE: Starting the engine and idling for short pe- riods of time is not recommended. During a cold engine start-up, enough moisture is developed within the engine and the exhaust system to cre- ate a corrosion hazard that could affect the future operation of the Pacbrake. The brake housing may trap water in the valve shaft bore causing corro- sion in an improper or nonfunctioning brake. If it is 1.
With the engine shut-down, use any oil-free or non- petroleum based high-heat lubricant and spray or coat a sufficient amount on the restricter valve shaft and the attaching locations at each end of the ac- tuation cylinder. See Fig. 4.5 . 2. With your hands or a pair of pliers, motion the valve several times to distribute the lubricant down the shaft and the attaching locations. 4.32