OPTION AR-POWER TRAIN 3844039 - Caterpillar

Swing Parking Brake Solenoid Valve
Illustration 1 g00936546
(1) Solenoid valve for swing parking brake (2) Passage from hydraulic activation control selector valve (3) Passage (4) Drain passage (5) Passage to swing parking brake (6) Passage (7) Passage for high pressure pilot supply (8) Passage (9) Solenoid valve for two-speed travelSwing parking brake solenoid valve (1) controls pilot oil flow to the swing parking brakes. During operation, swing parking brake solenoid valve (1) is nonenergized. A nonenergized swing parking brake solenoid valve (1) returns the pilot oil from passage (5) to the swing parking brakes to drain passage (4) to the hydraulic tank. The force of the spring for the swing parking brake applies the swing parking brake.When the swing pilot valve is actuated, the swing pressure switch opens. This sends an electrical signal to the machine control module. When swing parking brake solenoid valve (1) is energized, pilot oil is supplied to passage (5) for the swing parking brakes. Pilot oil in passage (5) for the swing parking brake releases the swing parking brakes. The swing parking brakes are located on the swing drives.Solenoid Valve for Dual Pressure
Illustration 2 g00936547
(2) Passage from the hydraulic activation control selector valve (3) Passage (4) Drain passage (6) Passage (7) Passage for high pressure pilot supply (8) Passage (10) Solenoid valve for dual pressure (12) Passage to load sensing signal relief valve (13) Solenoid valve for travel parking brakeDual pressure solenoid valve (10) controls pilot oil flow to the load sensing signal relief valve. Dual pressure solenoid valve (10) is normally nonenergized. A nonenergized dual pressure solenoid valve (10) returns the pilot oil from passage (12) to the load sensing signal relief valve to drain passage (4) to the hydraulic tank. When a travel pilot valve is actuated, the travel pressure switch closes. This sends an electrical signal to the machine control module.If no implement pilot valves have been actuated, an electrical signal is sent from the machine control module which energizes dual pressure solenoid valve (10). When dual pressure solenoid valve (10) is energized, pilot oil pressure is supplied from passage (2) to passage (12) to the load sensing signal relief valve. Pilot oil in passage (12) resets the load sensing signal relief valve in order to regulate the main system pressure to a pressure of 35000 kPa (5080 psi).If an implement pilot valve has been actuated, the machine control module will not energize the dual pressure solenoid valve.Solenoid Valve for Two-Speed Travel
Illustration 3 g00936548
(1) Solenoid valve for the swing parking brake (2) Passage from the hydraulic activation control selector valve (3) Passage (4) Drain passage (6) Passage (7) Passage for high pressure pilot supply (8) Passage (9) Solenoid valve for two-speed travel (14) Passage to high pressure check valveSolenoid valve (9) for two-speed travel controls the high