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3-14-osmotr-komponentov-podveski-i-rulevogo-privoda-proverka-sostoyaniya.html
3.14. Survey of components of a suspension bracket and steering drive, check of a condition of protective covers of power shafts
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The condition of components of a suspension bracket and the steering drive has to be made regularly as their wear or damage can be the reason of reduction of service life of tires, lead to decrease in controllability of the car and increase in fuel consumption. |
Check of a condition of shock-absorbers
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Park the car on the flat horizontal platform, whenever possible with a hard coating. Firmly cock the parking brake and check pressure of a rating of tires.
Press one of car corners down. At a corner otpuskaniye the body has to come back to a starting position, making no more than one-two fluctuations.
Rocking of a body with high degree of probability testifies to wear or weakening of the corresponding shock-absorber.
Repeat the procedure, serially passing to the remained car corners.
The car also establish to Poddomkratta it on props (see
the illustration Scheme of an Institution of Props for fixing of the car in the lifted situation).
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Attentively examine shock-absorbers on existence of signs of leak of liquid. Existence of a thin oil film should not cause concerns. Without fail make sure that a source of leak is the shock-absorber, in case of need make replacement of shock-absorbers in a set (forward and back).
Check reliability of fastening of shock-absorbers on the support. In case of detection of defects replace shock-absorbers (also in a set).
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Check of a condition of components of a suspension bracket and steering drive
The design of a suspension bracket and the steering drive of the Infiniti QX4 cars is presented in the Head Podvesk and steering.
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Visually check components of a suspension bracket and the steering drive for existence of deformations and mechanical damages. Estimate a condition of sealing cuffs, protective covers and rubber-metal plugs — try not to pass signs of development of leaks.
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Check a condition of protective covers of a case of the steering mechanism.
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Check a condition of boots of hinged tips of steering drafts.
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Check a condition of boots of spherical support.
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Clear the lower surface of a rotary fist of dirt traces, ask the assistant to grasp bottom edge of a wheel and to pull it in the cross direction. Try to estimate visually a side play in spherical support of connection of a fist with a suspension bracket control lever. In the presence of a side play the worn-out hinge is subject to replacement.
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Grasp forward and back edges of a wheel, then press on a first line and pull on yourself back. In case of identification of a side play in joints of components of the steering drive check a condition of tips of steering drafts. Wear of external tips can be revealed visually, internal — to the touch through a protective cover of the steering mechanism (when rocking a wheel). Pass to other board of the car and repeat the procedure, having pulled an opposite wheel.
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Having lowered the car on the earth, estimate the size of a side play of a steering wheel. From under the car visually estimate inertness of operation of the steering drive at rotation of a steering wheel (the help of the assistant will be required).
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Check of a side play of steering
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Establish a steering wheel in average situation.
Rotate a steering wheel in both parties, watching at the same time forward wheels. The steering wheel can have the maximum side play of 25 mm.
At an excessive side play of a steering wheel it is necessary to check a condition of drafts of the steering drive, steering mechanism and to estimate the size of a side play of bearings of a forward suspension bracket.
Strongly move steering drafts a hand. Spherical hinges should not have a side play. In case of need replace the corresponding components.
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Check of a condition of wheel bearings
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Pull a forward wheel both hands at the top and lower edges — existence of a little noticeable side play demonstrates easing / damage of the wheel bearing or components of a suspension bracket. Ask the assistant to squeeze out firmly a pedal of a foot brake and repeat check — if the side play disappears, or will be reduced to the minimum level, therefore, it is necessary to be engaged in the bearing, otherwise check a condition of knots of a joint of components of a suspension bracket.
Grasp forward and back edges of a wheel and repeat the check described above — if when squeezing a brake pedal the side play disappears, it is necessary to tighten or replace the stupichny bearing, otherwise check a condition of components of the steering drive.
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Check of a condition of protective covers of power shafts
The corrugated rubber covers established since both ends of each of power shafts are designed to protect hinges of equal angular speeds (CV JOINTS) from the destructions connected with hit of dirt in them. Hit of oil and lubricant on a surface of covers can lead to their premature destruction. It is expedient to wash out covers solution of soap water from time to time. In view of a constant flexure at turns of wheels, covers of external CV JOINTS wear out quicker and have to be checked more often and more regularly.
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Attentively check covers for existence of cuts, cracks and other damages, estimate reliability of fixing by their bandage tapes. In case of detection of defects, or traces of leak of lubricant the damaged cover is subject to replacement.
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