BAR GP-TAMPER 3904848 - Caterpillar

Illustration 1 g00761696
Location of the service brake control valve on (S/N: AFX1-841) and (S/N: AGF1-790)
Illustration 2 g01015304
Location of the service brake control valve on (S/N: AFX842-UP) and (S/N: AGF791-UP)The service brake control valve is located under the hood in front of the windshield. The service brake control valve is to the left of the metering pump for the steering system.
Illustration 3 g00753901
Service brake control valveTypical Example (A) Section that controls front service brakes (B) Section that controls service brakes on the trailer (T1) Tank port for the front service brakes (T2) Tank port for the service brakes on the trailer (P1) Pressure to the service brake control valve for the front service brakes (P2) Pressure to the service brake control valve for the service brakes on the trailer (B1) Pressure to the front service brakes (B2) Pressure to the service brakes on the trailerThe service brake control valve controls the flow of oil to the front service brakes and the service brakes on the trailer.Section A of the service brake control valve controls the flow of oil to the front service brakes.Section B of the service brake control valve controls the flow of oil to the service brakes on the trailer.Oil from the piston pump flows through the valve to port "P1". The accumulator for the front service brakes is also connected to port "P1".Port "B1" is connected to the front service brakes. When the brake pedal is pressed, the front service brakes are engaged.Port "T1" is connected to the hydraulic tank. Oil flows from port "T1" to the hydraulic tank when the service brake pedal is released.Oil from the piston pump flows through the valve to port "P2". The accumulator for the service brakes on the trailer is connected to port "P2".Port "B2" is connected to the service brakes on the trailer. Oil from port "B2" flows to the service brakes on the trailer when the brake pedal is pressed. The service brakes on the trailer are engaged.Port "T2" is connected to the hydraulic tank. Oil from the service brakes on the trailer flows through port "T2" to the hydraulic tank when the service brake pedal is released.When the brake pedal is pressed, port "P1" is connected to port "B1". Oil from the piston pump flows to the front service brakes. The front service brakes are engaged. Pressure in port "B1" is transmitted to internal passages. The