The main components of an automatic transmission are a torque converter, which transmits torque to the gear sets via a chain drive, and a hydraulic circuit, which regulates the selection of gears, clutches and brakes in accordance with engine speed and load. The automatic transmission is a very precise mechanism and working with it requires absolute cleanliness. If dirt gets into the box, it can cause the valves to malfunction and possibly damage the internal parts of the box.
Given the complexity of the box, at home you can only perform with it those operations that are indicated in the following sections. The box must be repaired by a specialist.
Pic. 6.38. Automatic transmission type 125 TNM: 1. Torque converter; 2. Turbine wheel; 3. Pump wheel; 4. Guide wheel; 5. Drive sprocket; 6. Sprocket holder; 7. Turbine shaft; 8. Oil pump shaft; 9. Brake band; 10. Direct coupling; 11. Forward clutch; 12. Carrier of input satellites; 13. Clutch housing; 14. Low speed and reverse clutch; 15. Freewheel; 16. Jet planetary gear; 17. Tachometer drive gear; 18. Regulator; 19. Differential; 20. Axial drive; 21. Regulator hydraulic line; 22. Parking lock activation device; 23. Seal; 24. Hydraulic line; 25. Transmission fluid filter; 26. Brake band servo block; 27. Carter; 28. Driven sprocket holder; 29. Driven sprocket; 30. Axial shaft; 31. Chain drive; 32. Battery; 33. Pump with valves; 34. Downshift switching device; 35. Hydraulic line booster valve.
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