CONNECTOR 3960385 - Caterpillar

Illustration 1 g00464670
Right Side View of the MachineRemove the operator's platform (arrow). This will allow access to the brake accumulator charging valve and other brake components.
Illustration 2 g00464671
Location of Brake Accumulator Charging Valve The operator's platform and the cab have been removed for clarity.
Illustration 3 g00290902
Port Locations for the Brake Accumulator Charging Valve (1) Accumulator port for the front brakes. (2) Inlet from the brake pump. (3) Plug. (4) Outlet to the hydraulic oil tank. (5) Accumulator port for the rear brakes. (6) Pressure relief valve. (7) Port for the brake oil pressure switch.The implement pilot/brake pump supplies hydraulic oil to the brake accumulator charging valve. The brake accumulator charging valve maintains the pressure in the accumulators at a constant range while the engine is running.
Illustration 4 g00471091
Schematic of the Brake Accumulator Charging Valve (1) Accumulator port for the front brakes. (2) Inlet from the brake pump. (4) Outlet to the hydraulic oil tank. (5) Accumulator port for the rear brakes. (6) Pressure relief valve. (7) Port for the brake oil pressure switch. (8) Flow control valve. (9) Orifice for controlling the rate of oil charge to the brake accumulators. (10) Check valve. (11) Load sensing spool. (12) Inverse shuttle check valve.The accumulator charging valve controls the flow of oil to the brake accumulators. Pressure relief valve (6) limits the oil pressure that flows to the brake circuit.Check valve (10) prevents oil from flowing back through the accumulator charging valve and to the implement pilot/brake pump.Flow control valve (8) regulates the flow of oil to the brake circuit. Any excess oil that is not required by the implement pilot circuit or the brake circuit is diverted back to the hydraulic oil tank.Note: The flow control valve (8) contains shims that set the standby pressure. When the implement pilot/brake pump is at standby pressure 4310 210 kPa (625 30 psi) the brake accumulators do not require charging.The load sensing spool (11) is for controlling the cut-in and the cut-out pressures for the brake accumulator charging valve. When the oil pressure in the brake circuit reaches the cut-in pressure, spool (11) shifts. The movement of spool (11) causes the spool in flow control valve (8) to also shift. This allows oil to flow to inverse shuttle check valve (12). The movement of inverse shuttle check valve (12) allows the oil to charge the brake accumulators.When the oil pressure in the brake circuit reaches the cut-out pressure, spool (11) shifts the opposite direction. This causes the spool in flow control valve (8) to also shift. This stops the flow of oil to inverse shuttle check valve (12) .Oil flows through inverse shuttle check valve (12) to the brake accumulators during oil charge. Pressurized oil from inverse shuttle check valve (12) flows to the oil end of the two brake accumulators, but the oil flow between the two brake accumulators is kept separate. Inverse shuttle check valve (12) is designed to charge each brake accumulator when the pressure reaches the cut-in pressure.A