AIR CONDITIONER AR 9P5227 - Caterpillar

Auxiliary exhaust braking devices are not approved for use on the 3306B Engine except for the Jacobs Engine Brake.
Jacobs Engine Brake
Operation
The Jacobs Engine Brake should not be used as a primary or service brake. Do not allow the engine to exceed 2400 rpm in any situation. However, a Jacobs Engine Brake equipped engine should not be operated above 2100 rpm.
The Jacobs Engine Brake is an engine attachment that converts a diesel engine into an air compressor. Its function is to slow the vehicle and reduce brake wear.This attachment is available with all direct injection engines (TA or ATAAC) Serial No. 63Z5471 or greater. Refer to your Caterpillar dealer for more information regarding adaptability for your engine.Operating Controls
The Jacobs Engine Brake reacts quickly. It should activate or deactivate in less than 1/4 of a second.The Jacobs Engine Brake controls may include a dash mounted module or an ON/OFF switch and a three position switch with "Lo," "Med" and "Hi" depending on how many cylinders of braking desired. Refer to the OEM vehicle manual for the type of operating controls that your vehicle is equipped with. Vehicles equipped with automatic transmissions are equipped with other control systems.On some applications a multi-position switch is used to provide variable retarding capability. Operators should become familiar with the controls used on their vehicles.Since the Jacobs Engine Brake is most effective at rated engine speed, gear selection is very important. Gearing down the vehicle, within the limits of rated engine speed, makes the engine brake a more effective retarder. Maximum retarding occurs at higher engine speeds. However, a Jacobs Engine Brake should not be operated above 2100 rpm.Refer to the "Truck Engine Application and Installation Guide," Form LEBT8121 April, 1988 for more information.