Check and repair of the steering mechanism

Carefully inspect the working surfaces of the roller and worm for signs of wear, jamming or scratches. Replace worn and damaged parts.

Check the gap between the bushings and the bipod shaft, which should not exceed 0.10 mm. If the gap is greater than specified, then replace the bushings using the A.74105 mandrel.

On the inner surface of the bipod shaft bushings there are spiral grooves that go out only on one side of the bushing. When pressing, position the lugs 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, finish the bushings 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 ease of rotation of the bipod shaft roller on the ball (needle-like) bearing.

The ball bearings of the worm and roller must rotate freely, without sticking, there must be no wear and damage on the surface of the rings and balls.

Check the axial clearance between the head of the adjusting screw 8 (rice. 5-5) and the groove of the bipod shaft 7. The gap should not exceed 0.05 mm. If it is larger, replace the adjusting plate 9 with a thicker one.

Note. Spare parts are supplied with adjustment plates in eleven sizes, with a thickness of 1.95 mm to 2.20 mm; the increase of each size is 0.025 mm.

Check the condition of the fixing plates 5 (rice. 5-3). If they are deformed, replace them.