HOUSING 4M0597 - Caterpillar

When the braking system is fully charged, oil flow from piston pump (9) enters main control valve (1) at the P1 port. Oil flows through the main control valve, through screen (1v), orifice (1u) and check valve (1t) to shuttle valve (1s) and diverter valve (1k). The Diverter valve blocks the oil flow and the shuttle valve divides the flow between the two sections of brake control valve (14) .Oil from the FB port flows to service brake control valve (14) and accumulator (17). The oil flow is blocked at the service brake control valve. This is the oil supply for service brakes (13) for the front axle.Oil from the RB port flows to service brake control valve (14) and accumulator (16). The oil flow is blocked at the service brake control valve. This is the oil supply for service brakes (11) for the center axle and service brakes (10) for the rear axle (if equipped). During the charging process, the valve spool within diverter valve (1k) is moved by an internal spring by the decreased system pressure. Oil flow from piston pump (9) is directed through the valve spool and into the load sensing line. Oil in the load sensing line flows through shuttle valve (1cc) and shuttle valve (1gg) and out of the LS1 port to piston pump (9). Pressure in the load sensing system is also transmitted to diverter valve (1o) and the diverter valve blocks oil flow into the hoist system. The load sensing pressure causes the output of the piston pump to increase until the requirements of the braking system are satisfied. Any excess system pressure is relieved by relief valve (1l) .When the requirements of the braking system are satisfied, oil pressure acts on the end of the valve spool within diverter valve (1k). This moves the valve spool against the internal spring, which blocks the oil flow into the load sensing system. Pressure in the load sensing system is relieved to the tank through the diverter valve which causes the output of the piston pump to decrease. Diverter valve (1o) also opens and this allows oil to flow into the hoist system.Pressure switch (25) is exposed to pressure within the braking system. If the pressure drops below the required magnitude, the switch triggers a category 3 warning by the monitoring system via the ECM.Service Brakes Engaged
Illustration 2 g01278802
Service brakes engaged. The parking brake disengaged and the brake system charged. (1) Main Control Valve (1f) Relief Valve (1k) Diverter Valve (1l) Relief Valve (1o) Diverter Valve (1s) Shuttle Valve (1t) Check Valve (1u) Orifice (1v) Screen (1cc) Shuttle Valve (1gg) Shuttle Valve (9) Piston Pump (10) Service Brakes for the Rear Axle (If equipped) (11) Service Brakes for the Center Axle (13) Service Brakes for the Front Axle (14) Brake Control Valve (14a) Spool (Front Service Brakes) (14b) Spool (Service Brakes for the Trailer) (15) Accumulator (Parking Brake) (16) Accumulator (Service Brakes for the Trailer) (17) Accumulator (Service Brakes for the