The device of the wheel part and the steering knuckle assembly of the front drive axle is shown in fig. 1

Disassemble the steering knuckle assembly only when changing the lubricant in the steering knuckle housing, when adjusting the kingpin bearings and in case of a malfunction (breakage of the parts of the constant velocity joint, destruction of the kingpin bearing).

When disassembling the assembly, it is impossible to unassemble the worn parts of the hinge. In addition, it is important to maintain the relative position of the hinge parts.

Knuckle Assembly Disassembly

Close the wheel valves, remove the protective cover and disconnect the air supply hose 2 from the wheel valve, the wheel to be removed.

Loosen the wheel nuts.

Raise the front of the car and place a stand under the front end of the frame.

Unscrew the wheel nuts and remove the wheel.

Disconnect the brake hose, sealing system and tire inflation system.

Unpin and unscrew the nut securing the ball pin of the steering trapezium rod, bipod rod or hydraulic booster tip (if the right steering knuckle assembly is being disassembled).

Using a puller, press out the ball pins.

Steering knuckles and front drive axle joints of the Ural vehicle

Unscrew the bolts securing the hub cover, unscrew the air supply elbow from the axle shaft 6 and remove the hub cover together with the seal and the air supply hose.

Remove shaft 6 using a puller.

Bending the edge of the lock washer, unscrew the lock nut 7, remove the lock and lock washers.

Unscrew nut 10 and remove the wheel hub assembly with the brake drum.

Using a spudger, remove the brake shoe return spring.

Unscrew the nuts securing the brake shield and stub axle 4.

Remove the brake shield assembly with brake pads, wheel cylinder 11, clip, dust seal and washer.

Remove the stud from the steering knuckle housing.

Steering knuckles and front drive axle joints of the Ural vehicle

Remove the parts of the constant velocity joint (Fig. 2).

Using paint, mark the relative position of the worn parts of the hinge.

Remove lubricant from knuckle housing and ball joint cavity.

Unscrew the bolts securing the stuffing box 10 (Fig. 3) of the ball joint and remove the stuffing box.

Remove the rubber plug 16 from the groove of the steering knuckle housing.

Unscrew the lever fastening nut 7 and, lightly tapping the lever with a hammer, remove the expansion cone bushings 3 and the lever with gasket package 2 from the studs.

Unscrew the cover fastening nuts 18 and remove the cover together with the shim pack 17.

Link shim packs to lever 7 and cover 18.

Steering knuckles and front drive axle joints of the Ural vehicle

Press out the outer races of bearings 9 and 19, use a puller to remove the inner races of bearings assembled with rollers. Remove the steering knuckle housing.

If it is necessary to replace the stuffing box 10, unscrew the nuts securing the ball joint 15 and use a mounting spatula to remove it using the undercuts of the ball joint flange.

Assemble the steering knuckle assembly in the reverse order of disassembly.

Before installing the constant velocity joint and pivot bearings, be sure to lubricate the mating surfaces of the parts.

The sealing gaskets of the ball joint, the oil seal and the pivot pin, the mating surfaces of the housing 1 of the steering knuckle, the lever 7 and the cover 18 must be lubricated with a thin layer of sealing lubricant, the neck of the ball joint under the axle shaft housing with graphite lubricant.

Also apply sealing lubricant to the threaded surface of the holes before installing the oil level plug or knuckle housing studs.

Steering knuckles and front drive axle joints of the Ural vehicle

Before installing and fastening the parts of the ball joint seal (stuffing box, cuff, sealing and spacer rings, stuffing box cover), adjust the preload of the pivot bearings.

Adjust the bearings by changing the thickness of the shim packs 2 and 17.

The factory-manufactured shim set consists of four sizesov 0.5 thick; 0.22; 0.1 and 0.05 mm.

Each package of shims installed under lever 7 and cover 18 must have at least two shims 0.05 mm thick located on both sides of the package.

The amount of torque required to smoothly rotate the steering knuckle body should be 2.2-2.7 kgf/m, which corresponds to a force of 8-10 kgf applied to the end of the steering link arm (cast integrally with the knuckle body).

The force required to smoothly turn the fist is determined using a dynamometer (Fig. 4). If the magnitude of the force is outside the specified limits, by selecting shims 2 and 17 (see Fig. 3) to achieve the required turning force.

After adjustment, the thickness of the shim packs under the lever and the cover should not differ by more than 0.05 mm.

When installing the ball joint seal, make sure that the spring does not fall out of the seal groove.

After installing the stuffing box cover, the recesses under the surface of the ball joint should be located along an axis perpendicular to the axis of the pivots.

When assembling, install the parts of the hinge of equal angular velocities in accordance with the marks made during disassembly.

Saturate the dust seal with gear lubricant before installation.

After installing the hub assembly with the brake drum, adjust the hub bearings.

If necessary, adjust the gap between the brake pads and the drum.

After assembly, fill the steering knuckle housing with lubricant through the filler hole (which is also a control hole).