Usage:
Many 1693 Engines are equipped with a Caterpillar BrakeSaver, providing safe retarding with less service brake wear.
The BrakeSaver is designed to provide a means of decelerating vehicles and for controlling the forward speed of the truck while decending long grades.
The BrakeSaver function is similar to a stalled fluid coupling...transforming the rolling energy of a vehicle-in-motion into HEAT which is then dissipated through the engine cooling system.
OIL CIRCUIT: Through the use of an air actuated control valve which can be actuated either manually or automatically, engine oil is pumped to the BrakeSaver which is located within the engine flywheel housing. The oil is then directed against a stationary stator by means of a crankshaft driven rotor. The interaction of the rotor and stator cause the oil to be mechanically sheared and in this manner, the engine oil absorbs the retarding horsepower in the form of heat. The heated oil then flows to the engine oil cooler which transfers the heat to the engine cooling system.
Completing the cycle, the oil flows from the oil cooler, through the retarder control valve and again back to the BrakeSaver. When the BrakeSaver is not in operation, the control valve allows the oil to flow from the engine directly to the oil cooler bypassing the BrakeSaver. The BrakeSaver utilizes the standard engine oil and cooling systems eliminating the need for additional and/or separate engine oil or water systems.
Control Circuit: Air pressure actuates the control valve which directs oil flow to the BrakeSaver. The air pressure is controlled by manual control lever or automatically when the accelerator is released while the clutch is engaged (pedal up). The position of the selector switch determines how the control valve is actuated. In the manual position the BrakeSaver can be actuated only by the hand operated control lever. In the automatic position, the BrakeSaver can be actuated either manually or automatically.
Air is supplied from the main air supply tank through a pressure reducing valve to the manual control in the operator's compartment and to the solenoid valve.
When the starter switch is on, electrical current is available to the BrakeSaver selector switch. In the manual position, air goes through the manual control valve and double check valve to the control valve body. The controlled air pressure positions a spool valve where the oil from the engine crankcase is directed to the BrakeSaver in the flywheel clutch housing. Oil will continue to circulate in the BrakeSaver and slow the vehicle until the manual control lever is moved to the off position.
For automatic control of the BrakeSaver, the selector switch is placed in the MANUAL-AUTOMATIC position. Switches on the accelerator and clutch pedal actuate the solenoid valve allowing air pressure to flow to the BrakeSaver control valve. Both switches must be closed (accelerator released and clutch pedal released; feet off of both pedals) for the circuit to be completed to the solenoid.
Air is released through the exhaust vent in the manual control lever or the solenoid switch when the BrakeSaver is released. This allows quick release of pressure when acceleration is desired.
BRAKESAVER CONTROL AND OIL FLOW CIRCUIT (NOT IN OPERATION)
BRAKESAVER CONTROL AND OIL FLOW CIRCUIT (IN OPERATION)