BRUSH 7B7589 - Caterpillar

Illustration 1 g02176961
The steering solenoid and relief valve is located on the left-hand rail under the engine.
Illustration 2 g01801013
Inside view of the left-hand rail (1) Port for return oil (2) Oil sampling port (3) Steering relief valve (4) Steering solenoid valve (5) Check valve (6) Return port to steering section of the hydraulic tank (7) Pressure tap for the steering piston pump (8) Port to steering control valve (9) Port for rear steering accumulator (10) Port for the front steering and the center accumulators (11) Port for inlet oil (12) Check valve (13) Pressure tap for the accumulator pressure
Illustration 3 g01524850
Steering solenoid and relief valve (1) Port for return oil (3) Steering relief valve (4) Steering solenoid valve (5) Check valve (6) Return port to steering section of the hydraulic tank (8) Port to steering control valve (9) Port for rear steering accumulator (10) Port for the front steering and the center accumulators (11) Port for inlet oil (14) Cavity (15) Setscrew (16) Spring (17) Oil outlets (18) Valve (19) Passage (20) Passage (21) Cavity (22) OrificeThe pressure oil from the steering piston pump is routed through port (11) in order to fill cavity (21). Cavity (21) connects the following components: port (11) from the steering piston pump, ports (10) and (9) for the steering accumulators, port (8) for the steering control valve, passage (19) for steering solenoid valve (4) and steering relief valve (3). Return port (6) drains oil to the steering section of the hydraulic tank. Cavity (14) connects the following components: return port (6), port (1) for return oil from the steering system, passage (19) for steering solenoid valve (4) and steering relief valve (3) .Steering Solenoid Valve
Steering solenoid valve (4) is used to drain pressure oil from the accumulators when the machine is not being used.The oil pressure of the steering accumulators is in cavity (21). This oil flows through orifice (22) into passage (19). When the engine start switch is moved to the OFF position, steering solenoid valve (4) is activated. An activated steering solenoid valve (4) allows oil from passage (19) to return port (6) and to the steering section of the hydraulic tank. Orifice (22) controls the rate of pressure that is drained from the accumulators.
Illustration 4 g01524563
Front view of cabLocation of Chassis Electronic Control ModuleThe steering solenoid valve is activated for 70 seconds. The steering solenoid valve is activated by the Chassis Electronic Control Module when the engine start switch key is moved to the OFF position. The Chassis Electronic Control Module is located inside the panel at the front of the cab. The steering solenoid valve is not activated when the battery disconnect switch or the engine shutdown control is used .Steering Relief Valve
If the accumulator charging valve and the pump control valve fails to destroke the steering piston pump, steering relief valve (3) will protect the steering system. The oil in cavity (21) enters passage (20) in steering relief valve (3). If the pressure of the oil is within limits,