Noise in the gearbox
| Cause of malfunction | Method of elimination |
| 1. Bearing noise. | 1. Replace defective bearings. |
| 2. Wear of gear teeth and synchronizers. | 2. Replace worn parts. |
| 3. Insufficient oil level in the gearbox. | 3. Add oil. If necessary, eliminate the causes of oil leakage. |
| 4. Axial movement of shafts. | 4, Replace the bearing retaining parts or the bearings themselves. |
Difficulty shifting gears
| Cause of malfunction | Method of elimination |
| 1. Incomplete disengagement of the clutch. | 1. See subsection "Clutch". |
| 2. Seizure of the spherical joint of the gear shift lever. | 2. Clean the mating surfaces of the spherical joint. |
| 3. Deformation of the gear shift lever. | 3. Correct the deformation or replace the lever with a new one. |
| 4. Tight movement of the fork rods (burrs, contamination of rod seats, jamming of locking crackers). | 4. Repair or replace worn parts. |
| 5. Difficult movement of the sliding sleeve on the hub when the splines are dirty. | 5. Clean the parts. |
| 6. Deformation of gear shift forks. | 6. Straighten the forks and replace them if necessary. |
Spontaneous gear switching off or fuzzy gear switching
| Cause of malfunction | Method of elimination |
| 1. Wear of balls and piston rod seats, loss of elasticity of the clamps. | 1. Replace damaged parts. |
| 2. Wear of synchronizer locking rings. | 2. Replace the locking rings. |
| 3. Broken synchronizer spring. | 3. Replace the spring. |
| 4. Wear of the synchronizer clutch teeth or synchronizer ring gear. | 4. Replace the clutch or gear. |
| 5. Crushing of short hub teeth. | 5. Replace the synchronizer hub. |
Oil leak
| Cause of malfunction | Method of elimination |
| 1. Wear of the primary and secondary shaft seals. | 1. Replace the seals. |
| 2. Loosening of gearbox covers, damage to sealing gaskets. | 2. Tighten the nuts (the moment is specified in the appendix) or replace the sealing gaskets. |
| 3. Loosening of the clutch housing fastening to the gearbox housing. | 3. Tighten the nuts. |
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