5.1.1. Technical operations on the car

Establish forward wheels in the provision of rectilinear movement (a steering wheel in average situation), start the engine and make effort of 5 N a rim of a steering wheel (slightly turn a steering wheel).

Fig. 5.1. Free wheeling (люфт) steering wheel

Measure a free wheeling (люфт) a steering wheel on its rim (fig. 5.1).

Nominal rate of a free wheeling (люфта) steering wheel: 0–30 mm.

If люфт a steering wheel exceeds maximum permissible value, check existence of gaps in connections of a shaft of a steering and tips of steering drafts.

Fig. 5.2. The stand for measurement of radius of turn of operated wheels

Establish forward wheels on the stand for measurement of radius of turn and measure angles of rotation of operated wheels (fig. 5.2).

The nominal rate of angles of rotation of operated wheels is specified below.

Internal wheel: 40°01’ ±2 °.

External wheel: 33°45’.

If the angle of rotation does not correspond to nominal rate, adjust the lever mechanism.

Fig. 5.3. A detachment of the spherical hinge of a tip of steering draft from a rotary fist

By means of the special tool disconnect the spherical hinge of a tip of steering draft from a rotary fist (fig. 5.3).

Several times stir a finger of the spherical hinge for check of lack of an excessive free wheeling.

Fig. 5.4. Nut installation on a finger of the spherical hinge

Screw a nut on a finger of the spherical hinge, then measure the moment of the beginning of rotation of the hinge (fig. 5.4).

Nominal rate: 0,5–2,5 N · m.

If the measured size more top limit of nominal rate, replace a tip of steering draft.

If the measured size less bottom limit of nominal rate, check lack of the raised gaps or jamming in the spherical hinge and if necessary replace.

Arrange the car on an equal horizontal platform and establish operated wheels in the provision of rectilinear movement.

Increase frequency of rotation коленчатго an engine shaft to 900–1100 ^mines-1.

NOTE After check on the set frequency of rotation of a cranked shaft of the engine it is necessary to establish normal rate of rotation of idling.

Fig. 5.5. Measurement of the effort demanded for turn of a steering wheel

By means of a spring dynamometer measure the effort demanded for turn of a steering wheel from provision of rectilinear movement to the left and to the right (on 1,5 turns) (fig. 5.5).

Nominal rate of effort at turn of a steering wheel of 29 N.

Be convinced of absence of sudden change of size of effort of turn at rotation of a steering wheel.

If the measured size of effort of turn exceeds a nominal zanacheniye, check, whether there are no cracks and damages of protective covers of a spherical support of the bottom lever of a suspension bracket and the spherical hinge of a tip of steering draft.

Check a preliminary tightness of the bearing of a leading gear wheel of the steering mechanism and the moment of the beginning of rotation of the spherical hinge of a tip of steering draft.

Check the moment of the beginning of rotation of the spherical hinge.

Be convinced that the steering wheel independently comes back to average situation, and the effort necessary for turn and return of a steering wheel in average situation, is identical in both directions of rotation at smooth and sharp its turns.

Fig. 5.6. Check during movement

At car movement with speed of 35 km/h turn a steering wheel on 90 ° and hold it 2 св this situation. After release the steering wheel should return independently to a range in limits ±20 ° from average situation (fig. 5.6).

NOTE At sharp turn there can be an instant feeling of some "weight" of a steering wheel, however it is not considered malfunction. This feeling arises because of low productivity of the pump of the hydraulic booster of a steering on small frequency of rotation of a cranked shaft of the engine.

Fig. 5.7. A point of the appendix of effort on maple a belt of a drive of the pump of the hydraulic booster

Press on maple a belt of a drive of the pump of the hydraulic booster of a steering with effort of 98 N in a point specified in drawing 5.7, and check that the deflection of a belt corresponds to nominal rate.

Belt deflection (nominal rate): 6–9 mm.

Fig. 5.8. Bolt of adjustment of a tension of a belt

If the deflection of a belt does not correspond to nominal rate, adjust a tension, having weakened a bolt of adjustment of a tension of a belt on the pump of the hydraulic booster of a steering (fig. 5.8).

Establish the lever opposite to the pump of the hydraulic booster of a steering and, moving the pump, adjust a belt deflection so that it corresponded to nominal rate.

Tighten a bolt of adjustment of a tension of a belt on the pump of the hydraulic booster of a steering.

Check a deflection of a belt and if necessary repeat adjustment procedure.

ATTENTION Check of a deflection of a belt should be made after a provorachivaniye of a pulley of the pump of the hydraulic booster of a steering on one or several turns in the normal direction of rotation.

Establish the car on an equal horizontal platform.

Start the engine. On the motionless car make in a row some turns of a steering wheel that the temperature of working liquid increased approximately to 50–60 °C.

At the idling engine make some turns of a steering wheel to the right and to the left against the stop.

Check absence of turbidity or liquid foaming in a tank of hydrosystem of the amplifier.

Fig. 5.9. Tank of the hydraulic booster

Check size of a difference of levels of liquid in a tank of hydrosystem of the amplifier at the working and idle engine (fig. 5.9).

NOTE If level of liquid changes more than on 5 mm, it is necessary to remove air from hydrosystem of the amplifier repeatedly. If liquid level sharply raises after an engine stop, air from hydrosystem means is removed not completely. At incomplete removal of air from hydrosystem of the amplifier of a steering there are extraneous jingling noise from the pump of the hydraulic booster and the valve of regulation of a consumption of liquid that leads to reduction of service life of the pump and other elements of hydrosystem.