BLOCK 3514484 - Caterpillar

Illustration 1 g00288984
Solenoid and Relief Valve (1) Steering solenoid valve (2) Passage (3) Port for right steering accumulator (4) Orifice (5) Port for Auxiliary Power Unit (6) Port for inlet oil (7) Port for left steering accumulator (8) Passage (9) Port to steering metering pump (10) Cavity (11) Port for return oil from the steering metering pump (12) Cavity (13) Valve (14) Spring (15) Setscrew (16) Steering relief valve (17) Return port to steering hydraulic tank (18) Oil outlets (19) Plunger
Illustration 2 g00301297
(1) Steering solenoid valve (3) Port for right steering accumulator (5) Port for Auxiliary Power Unit (6) Port for inlet oil (7) Port for left steering accumulator (9) Port to steering metering pump (11) Port for return oil from the steering metering pump (16) Steering relief valve (17) Return port to steering hydraulic tank (20) Oil sampling valveThe steering solenoid and relief valve is located on the front frame rail under the engine.The pressure oil from the steering piston pump is routed through port (6) in order to fill cavity (10). Cavity (10) connects the following components: port (6) from the steering piston pump, ports (3) and (7) for the steering accumulators, port (9) for the steering metering pump, passage (2) for steering solenoid valve (1) and steering relief valve (16) .Return port (17) drains oil to the steering hydraulic tank. Cavity (12) connects the following components: return port (17), port (11) for return oil from the steering system, passage (2) for steering solenoid valve (1) and steering relief valve (16) .Steering Solenoid Valve
The steering solenoid valve (1) is used to drain pressure oil from the steering accumulators when the machine is not active.Pressure of the steering accumulators is in cavity (10). This oil flows through orifice (4) into passage (2). When steering solenoid valve (1) is deactivated, this oil is blocked by plunger (19). When the engine start switch is moved to the OFF position, steering solenoid valve (1) is activated. When steering solenoid valve (1) is activated, plunger (19) moves up. Pressure oil goes through orifice (4) in passage (2), past plunger (19) and out return port (17) to the steering hydraulic tank. Orifice (4) limits the return oil pressure from the steering accumulators to a rate lower than the pressure setting of the filter bypass valve in the steering hydraulic tank. When steering solenoid valve (1) is deactivated, the plunger (19) moves down. Plunger (19) blocks oil in passage (2).
Illustration 3 g00490368
Location of the electronic control for the steering accumulatorsThe steering solenoid valve is activated for 70 seconds. The steering solenoid valve is activated by the electronic control for the steering accumulators when the engine start switch key is moved to the OFF position. The electronic control for the steering accumulators is located under a cover at the rear of the cab. The accumulator purge solenoid is not activated when the battery disconnect switch or the engine shutdown control is used.Steering Relief Valve
The steering relief valve protects the steering system if the steering piston pump fails