| 1. Check the plug on lack of wear and deterioration of its condition. |
| 2. Check the bottom lever on lack of a bend or damages. |
| 3. Check a protective cover of the spherical hinge on lack of cracks. |
| 4. Check a condition of all bolts. |
| 5. Check a torque which is necessary for putting for a provorachivaniye of a pin of the spherical hinge of the bottom lever. |
| 6. If there are cracks in a protective cover, replace the spherical hinge. |
| 7. Several times shake here and there a pin of the spherical hinge of the bottom lever. |
| 8. Measure a torque necessary for a provorachivaniye of a pin of the spherical hinge of the bottom lever. Torque: 3,5–10 N • m |
| 9. If the torque exceeds admissible values, replace the spherical hinge. |
| 10. If the torque is much lower than admissible value, the spherical hinge can be reused, if it is not got jammed and has no excessive люфта. |