CYLINDER HEAD GP 9Y8849 - Caterpillar

Illustration 1 g02267834
(1) Front service brakes (2) Wires to transmission electronic control module (3) Left brake pedal (4) Wires to stop lamps (5) Right brake pedal (6) Service brake control valve (7) Accumulator for the rear service brakes (8) Accumulator for the front service brakes (9) Parking brake control valve (10) Parking brake (11) Parking brake actuator (12) Parking brake pressure sensor (13) Rear service brakes (14) Brake oil pressure sensor (15) Control manifold (16) Hydraulic oil filter (17) Piston pump (18) Breather (19) Hydraulic oil tank (20) Fan (21) Hydraulic oil cooler (22) Piston motor (23) Axle oil coolers (AA) Pressure tap for the front service brakes (BB) Pressure tap for the rear service brakes (CC) Pressure tap for the service brake accumulators
Illustration 2 g03181996
Left side view of the machine (1) Front service brakes (13) Rear service brakes (18) Breather (19) Hydraulic tank (22) Piston motor
Illustration 3 g03181918
Right side view of the machine (6) Service brake control valve (7) Accumulator for the rear service brakes (8) Accumulator for the front service brakes (9) Parking brake control valve (10) Parking brake (11) Parking brake actuator (12) Parking brake pressure switch (14) Brake oil pressure switch (15) Control manifold (17) Piston pump (AA) Pressure tap for the front service brakes (BB) Pressure tap for the rear service brakes (CC) Pressure tap for the brake accumulatorsPiston pump (17) supplies the hydraulic oil that is required in order to operate the brake and the hydraulic fan system. Oil flows from pump (17) to control manifold (15). The control manifold includes the following components: an inverse shuttle valve, a check valve, a fan solenoid valve, a cut-in/cut-out valve, a priority valve, three pressure reducing valves, a shuttle valve and a pressure relief valve.Control manifold (15) controls the flow of oil from pump (17) to brake accumulators (7, 8) and piston motor (22) for the hydraulic fan. Control manifold (15) also directs some of the oil to the pilot circuit for the implement and steering systems. A pump control valve limits the oil pressure that flows from pump (17). A pressure relief valve in control manifold (18) acts as a backup to the pump control valve.Control manifold (15) contains a priority valve and a cut-in/cut-out valve. The priority valve is a proportional valve. Proportional valves do not shift all the way to a particular position. The valve prioritizes the position that the shift is toward. When the cut-in/cut-out valve is shifted to the left, the priority valve is shifted to the right. With the priority valve shifted to the right, oil flows to an inverse shuttle valve that is located in control manifold (15). The oil then flows to brake accumulators (7, 8). When the accumulators are charged, the cut-in/cut-out valve shifts to the right, and the priority valve shifts to the left. Oil then flows to the fan circuit. The oil flows through a pressure reducing valve. From the pressure reducing valve, the oil flows to piston motor (22) for the hydraulic fan system. A