LINES GP-F FIL 1904040 - Caterpillar

Input and Output Components
Illustration 2 g01949231
(1) Brake ECM
(2) Speed sensor for the brake cooling pump
(3) Temperature sensors for the brake cooling oil
(4) Solenoid for the brake cooling pump Brake ECM (1) receives input signals from speed sensor (2) for the brake cooling pump and four temperature sensors (3) for the brake cooling oil. There is a temperature sensor (3) for the brake cooling oil for each braking station.Brake ECM (1) monitors the transmission and torque converter oil temperature via the Transmission ECM and the intake manifold air temperature, engine coolant temperature, and the engine oil temperature via the Engine ECM.The information from speed sensor (2) and temperature sensors (3) is used by Brake ECM (1) to control the speed of the brake cooling motor with solenoid (4) for the brake cooling pump.Hoist and Brake Cooling Sections of the Hydraulic Tank
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View of the hydraulic tank
(1) Outlet ports
(2) Return ports
(3) Brake cooling motor
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Side view of the hydraulic tank
(3) Brake cooling motor
(4) Check valves
(5) Screens
(6) Brake cooling pumps Brake cooling motor (3) drives brake cooling pumps (6) that are located inside the hydraulic tank. Oil from brake cooling pumps (6) flows through outlet ports (1) to the brake oil coolers. Oil returns from the brakes through return ports (2) and screens (5) to the hydraulic tank. Check valves (4) maintain a minimum pressure in the brake cooling hydraulic system.Modes of Brake Cooling
The speed for the brake cooling motor will vary depending on the desired speed that is set by the Brake ECM for the brake cooling motor. Brake cooling depends on the target temperatures of the engine and the power train, and the brake cooling oil temperatures. Refer to Table 1 for the modes of brake cooling.
Table 1
793F Modes of Brake Cooling
Mode of Brake Cooling No Brake Cooling Full ON Other Cooling Modulated Cooling
High Speed Braking Status Inactive Inactive OFF OFF
Max Brake Temperature Cool Very Hot Cool Hot
Engine Coolant Temperature Cool Not Very Hot Very Hot Not Very Hot
Engine Oil Temperature Cool Not Very Hot Very Hot Not Very Hot
Intake Manifold Air Temperature Cool Not Very Hot Very Hot Not Very Hot
Transmission Oil Temperature Cool Not Very Hot Very Hot Not Very Hot
Torque Converter Oil Temperature Cool Not Very Hot Very Hot Not Very Hot
Brake Cooling Motor OFF Full ON OFF Modulated
Motor for the Engine Fan See Requirements for the Fan Speed. See Requirements for the Fan Speed. Full ON See Requirements for the Fan Speed. The Brake ECM will send a current to the solenoid for the brake cooling motor in order to provide maximum cooling when increased brake oil temperatures are anticipated. The system is in the high speed state if any of the following conditions are met:
The lockup clutch is in the ON position.
Actual gear is unknown.
Actual gear is greater than first speed forward.The truck will be considered to be in "High Speed Braking" if one of the above conditions are met, and any of the following conditions are met:
The retarder mode is enabled (ARC or Manual).
The