3.4.3. Repair

Cardan shaft are balanced dynamically. Eliminate an imbalance with welding of plates on the ends of a shaft. At an individual method of repair establish details, suitable for further work, on former places where they were earned extra. Mark such details before removal in any way, not defiant their damage (paint, kerneniyem, etc.).
For repair remove a shaft from the car.

Dismantling of a cardan shaft

Fig. 214. Back driveshaft: 1 – flange; 2 – lock ring; 3 – crosspiece; 4 – the rubber reinforced cuff; 5 – needle bearing; 6 – the sliding fork; 7 – cap; 8 – press butterdish; 9 – steel cutting rings; 10 – felt ring; 11 – rubber ring; 12 – holder; 13 – driveshaft pipe; 14 – fork of the cardan hinge; 15 – face sealant of bearings

1. Turn off a holder 12 (see fig. 214) omental consolidation of shlitsevy connection, previously having corrected it in places kerneniya, and shift consolidation in the party of a pipe.

Fig. 215. Measurement of a radial gap of shliyets of a cardan shaft

Measure the indicator a radial gap of shliyets of a cardan shaft (fig. 215) at distance of 75-80 mm from the shlitsevy end of a fork in two perpendicular planes and write down its size.
Separate shlitsevy connection of a shaft, remove rings 9 (see fig. 214), 10, 11 and I will embrace 12.
2. Remove with the help of the screw-driver lock rings 2.
3. Vypressuyte with the help of adaptation 71-2427 glasses of needle bearings from openings of eyes of forks also disconnect forks kardana.
4. Clear and wash out all details of a cardan shaft.

Assessment of technical condition of details of a cardan shaft

Fig. 216. Measurement of a beating of a pipe of a cardan shaft

1. Correct or replace the bent shaft. After editing the admissible beating of a shaft should not exceed 0,6 mm in any point on its length (fig. 216). Govern a shaft on prisms.
2. Replace a crosspiece in the following cases:
– diameter of thorns is less than 16,26 mm;
– on thorns there are longitudinal dents;
– crosspiece necks under a cuff are strongly worn-out.
3. Replace epiploons of face sealants at wear or damage of their working edges.
4. Replace needle bearings:
– if bearings shake on thorns;
– one of needles is lost or deformed.
5. Replace worn-out details of shlitsevy connection of a cardan shaft if the radial gap in vents exceeds 1,3–1,5 mm.
6. Replace worn-out forks if diameter of an opening under the bearing more than 30,02 mm or the size between the planes of eyes of a fork exceeds 60,1 mm.
7. Replace a rubber or felt ring at their wear or damage.
8. Replace a holder of consolidation of shlitsevy connection if an internal thread of a holder is stripped.
9. At wear or breakage of separate details of a shaft replace a shaft if there is no opportunity it to balance. Replacement of a set of a crosspiece with bearings and epiploons in collecting without balancing of a shaft is allowed. If there is a vibration, balance a shaft.

Assembly of a cardan shaft
1. Establish the end of a cardan shaft on shlitsevy I will embrace 12 (see fig. 214), a felt ring 10, a rubber ring 11 and rings 9.
Before assembly of shlitsevy connection impregnate with lubricant a felt ring 10 and grease vents.
2. Collect shlitsevy connection so that forks of cardan hinges were in one plane (a deviation no more than 5 °). For this purpose combine tags (arrow) made before dismantling.
3. Wrap a holder 12 to the full and zakernite in two opposite places so that the edge of a holder was a little bent in bore of the sliding fork.

Fig. 217. An arrangement of press-butterdishes at assembly of a cardan shaft (a view from side of the bridge)

4. Establish crosspieces and forks of hinges so that the press-butterdishes of shlitsevy connection and a crosspiece located at the bridge were in one plane and on one party of a shaft, and the butterdish of a crosspiece of the opposite end of a shaft was turned on 90 ° against an hour arrow if to look from side of the bridge (fig. 217).
5. Fix a fork with a crosspiece in adaptation or a vice and press glasses of needle bearings in eyes. Thus you watch that the working edge of epiploons of face sealants of bearings was not wrapped.
Establish in grooves of glasses lock rings 2.
6. Collect the cardan hinge of the opposite end of a shaft in the specified way.
7. Grease before assembly hinges Litol-24 lubricant for what fill with lubricant each bearing on 1/2 its volumes.
8. After assembly check:
– ease of movement of forks sphere-nira. They have to move (without jamming) from a hand;
– the size of angular movement in hinges of a collected cardan shaft. For one hinge it should not exceed 0,3 mm (the nominal size of 0,23 mm) on the radius of 35 mm under the influence of torque of 100 - 120 N · m (10–12 kgfs · м).
When replacing flanges or forks balance a collected shaft dynamically. An imbalance, admissible after repair, – no more than 26 гс · see.
At repair of cardan shaft use these tab. 14.