Kamaz power steering control valve

The power steering control valve (Fig. 2.) is attached to the bevel gear housing

The body 8 of the valve has holes made with great precision - one central and six (three through and three deaf) holes of smaller diameter located around it.

KAMAZ power steering

The spool 6 of the control valve, located in the central hole, is fixed on the screw 17 (see Fig. 1.) through the bearings 22 with the nut 24, the shoulder of which is pressed into the groove of the screw 17 for fixing.

Under the nut) there is a conical spring washer 23, which ensures the constancy of the tightening force of the thrust bearings.

The concave side of the washer is installed towards the bearing.

The large thrust bearing races face the spool.

Power steering control valve

Body 8 (Fig. 2) of the valve is equal in length to the length of the spool, but has recesses at the ends.

The recesses allow the spool with screw and thrust bearings to move axially 1.1 mm to each side of the center position.

In one of the plungers located in blind holes, a ball check valve 4 is built in, which connects the high and low pressure lines in case of failure of the steering hydraulic system, while maintaining the ability to drive the car.

In this case, the steering works like a conventional non-assisted mechanical system.

A safety valve 10 is also installed in the control valve body, connecting the discharge and drain lines at a pressure in the system exceeding 80 MPa, and thus protecting the pump from overheating, and the parts of the mechanism from overloads.

The safety valve is located in a separate boss, which allows you to check, adjust or replace it if necessary without disassembling the mechanism.

High and low pressure pipelines are connected from the pump to the control valve body.

The first route sends oil to the mechanism, and the second one returns it to the hydraulic reservoir.

To cool the oil, a radiator is included in the power steering system, which is an aluminum finned tube located in front of the radiator of the engine cooling system.