- the absence of visible signs of wear, seizing, dents or scratches on the working surfaces of the roller and worm. Replace worn and damaged parts;
- gap between the bushings and the bipod shaft. If it is more than specified in tab. 10, then replace the bushings;
- ease of rotation of the bipod shaft roller and worm bearings. The latter should rotate freely, without jamming, and there should be no visible wear and damage on the surface of the rings and balls;
- on the inner surface of the bushings of the bipod shaft there are spiral grooves that have access to only one side of the bushing. When pressing the bushings, position them so that their ends with groove outlets are inside the crankcase opening, and the groove outlets are located opposite each other. The ends of the bushings should be buried in the crankcase hole by 1.5 mm. Lubricate new bushings with transmission oil before pressing. After pressing into the crankcase, the bushings are finally processed with a reamer A.90336 to a size of 28.698-28.720 mm. The mounting gap between the bipod shaft and bushings should be within 0.008-0.051 mm;
- check the axial clearance between the head of the adjusting screw 2 (see fig. 184) and the groove of the bipod shaft 13; the gap should not exceed 0.05 mm. If it is larger, replace the adjusting plate 1 with a thicker one;
- check the condition of the fixing plates 5 (see fig. 185), if they are deformed, replace them.
Disassembly
Unscrew the coupling bolt of the universal joint yoke and disconnect the intermediate 3 (see fig. 185) and upper shaft 4 steering. If the upper shaft and its bearings are damaged, flare the punching points of the pipe of the bracket 6 and remove the shaft 4 complete with bearings 9 and bushings 8. If the shaft rotates in the bearings without sticking and no axial and radial free play is felt in the bearings, then disassembly of the upper shaft is not recommended. If the shaft or its bearings are worn or damaged, replace them with new ones.
Assembly
Reassemble in the reverse order of disassembly, then screw in two points on both sides of the bracket tube to secure the shaft bearings.