1. Remove the synchronizer from the secondary shaft (see "Repair of the secondary shaft of the gearbox").
2. Before disassembling the synchronizer, mark the position of the clutch 3 relative to the hub 1. Carefully disassemble the gearbox synchronizer by removing the clutch from the hub. Make sure that the spring-loaded crackers 2 with balls do not fly apart in different directions.
3. Inspect the synchronizer parts. Chips and nicks on the splines of the hub and coupling are not allowed (pay special attention to the ends of the coupling teeth). Damage or signs of seizing on crackers, balls and springs are not allowed. Replace defective parts or the gearbox synchronizer assembly.
4. Install the coupling on the hub in accordance with the previously made marks.
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5. The three large grooves on the splines of the synchronizer clutch must match the grooves in the hub for the locks (with holes).
6. Lubricate the retainer spring with Litol-24 grease and insert it into the hole in the hub groove.
7. Lubricate the cracker with Litol-24 grease and insert the ball into its hole.
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8. While compressing the spring, insert the cracker with the ball into the groove of the hub. Grooves a on the cracker there should be an outward, spherical (large) surface b - facing the synchronizer clutch.
9. Push the cracker so that the ball enters the grooves on the splines of the synchronizer clutch.
10. Adjust the spring with a screwdriver so that it fits into the cracker hole. Install the remaining fasteners in the same manner.