RETAINER 9R6572 - Caterpillar

Illustration 1 g01793673
(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 front service brakes (8) Accumulator for the rear service brakes (9) Parking brake (10) Parking brake actuator (11) Rear service brakes (12) Brake oil pressure switch (13) Parking brake control valve (14) Parking brake pressure switch (15) Piston pump (16) Breaker relief valve (17) Hydraulic oil tank (18) Control manifold (19) Hydraulic oil filter (20) Hydraulic oil cooler (21) Gear motor (22) Fan (AA) Pressure tap for the rear service brakes (BB) Pressure tap for the front service brakes (CC) Pressure tap for the service brake accumulators
Illustration 2 g01793675
Left side view of the machine (1) Rear service brakes. (11) Front service brakes. (16) Breaker relief valve. (17) Hydraulic oil tank. (21) Gear motor.
Illustration 3 g01793676
Right side view of the machine (6) Service brake control valve. (7) Accumulator for the front service brakes. (8) Accumulator for the rear service brakes. (9) Parking brake. (10) Parking brake actuator. (12) Brake oil pressure switch. (13) Parking brake control valve. (14) Parking brake pressure switch. (15) Piston pump. (18) Control manifold. (AA) Pressure tap for the front service brakes. (BB) Pressure tap for the rear service brakes. (CC) Pressure tap for the brake accumulators.Piston pump (15) supplies the hydraulic oil that is required in order to operate the brake and the hydraulic fan system. Oil flows from the pump (15) to the control manifold (18) . The control manifold includes the following components: a pressure relief valve, a shuttle valve, an inverse shuttle valve, a cut in valve, a cut out valve and a priority valve.The control manifold (18) controls the flow of oil from the pump (15) to the brake accumulators (7) and (8) . The control manifold (18) also controls the flow of oil to the gear motor (21) for the hydraulic fan. A pressure relief valve that is located in the control manifold (18) limits the oil pressure that flows from the pump (15) .The control manifold (18) contains a priority valve. When this valve is closed, oil flows to an inverse shuttle valve that is located in the control manifold (18) . The oil then flows to the brake accumulators (7) and (8) . When the accumulators are charged, the priority valve opens. Oil then flows to the gear motor (21) for the hydraulic fan system. A port in the control manifold (18) connects to the brake oil pressure switch (12) . The brake oil pressure switch (12) monitors the oil pressure in the brake accumulators. If the oil pressure in either brake accumulator drops below the minimum threshold, switch (12) actuates.Brake accumulators (7) and (8) contain a precharge of dry nitrogen. When oil flows into an accumulator, the pressure oil moves the piston inside the accumulator. The piston moves against the charge of dry nitrogen gas. This puts compression on the dry nitrogen until the