BODY-CENTRAL 2043064 - Caterpillar

NO STEER Position
Illustration 1 g00295181
Steering control valve that is shown in the NO STEER position (1) Test port for the pump pressure. (2) Oil port for the head end of the left side steering cylinder. (3) Oil port for the head end of the right side steering cylinder. (4) Damper assembly. (5) Chamber. (6) Metering holes. (7) Return oil passage. (8) Spool. (9) Oil supply port from the steering pumps. (10) Oil return port to the hydraulic tank. (11) Relief valve. (12) Orifice. (13) Pilot relief valve. (14) Spring. (15) Metering holes. (16) Oil passage. (17) Oil port for the rod end of the left side steering cylinder. (18) Return oil passage. (19) Oil outlet passage for a left turn. (20) Cylinder crossover relief valve. (21) Oil outlet passage for a right turn. (22) Signal port for the steering pumps. (23) Shuttle valve. (24) Oil port for the rod end of the right side steering cylinder. (25) Oil passage.
Illustration 2 g00295183
View A-A (26) Pilot oil port for a right turn.
Illustration 3 g00295182
View B-B (27) Oil supply port from the steering pumps. (28) Pilot oil port for a left turn.The steering control valve consists of the following components: cylinder crossover relief valve (20), shuttle valve (23) for the signal oil, relief valve (11) for the steering system and steering control valve spool (8) .Pilot pressure oil from the steering metering pump is used to actuate steering control valve spool (8) . Spool (8) directs the flow of high pressure oil from the steering pumps to the steering cylinders.Pilot oil flows to spool (8) only when the steering wheel is being turned. The flow of pilot oil to the spool is stopped when the rotation of the steering wheel is stopped. The flow of pilot oil is also stopped when a steering neutralizer valve contacts the stop assembly. This occurs after a complete turn has been made. When the pilot oil flow is stopped, spring (14) moves spool (8) to the NO STEER position.While the steering control valve is in the NO STEER position, spool (8) blocks the high pressure oil in the oil lines to the steering cylinders. This will keep the machine turned in the stopped direction of the steering wheel.High pressure oil from oil supply