What Causes Transmission Slippage?

1 Answers
StValentina
07/30/25 3:14am
Transmission slippage can be caused by the following issues: 1. Hydraulic oil level is too low. 2. Hydraulic oil level is too high, causing excessive air bubbles when vigorously agitated by the planetary gear set during operation. 3. Excessive wear or burning of clutch or brake friction plates and brake bands. 4. Excessive wear of the oil pump or leakage in the main oil circuit, resulting in excessively low oil pressure. 5. Slippage of the one-way overrunning clutch. 6. Damage to the piston seal rings of the clutch or brake, causing oil leakage. 7. Damage to the piston seal rings of the shock absorber, causing oil leakage. Here are some related steps for diagnosis: 1. For automatic transmissions exhibiting slippage, first check the hydraulic oil level. If the oil level is too low or too high, adjust it to the normal level and recheck. If the automatic transmission does not slip after adjusting the oil level to normal, no further repair is needed. 2. Inspect the quality of the hydraulic oil. If the oil appears dark brown or has a burnt smell, it indicates that the clutch or brake friction plates or the brake itself are burnt, and the automatic transmission should be disassembled for repair. 3. Conduct a road test to determine if the automatic transmission is slipping and identify the affected gear and the severity of slippage. Place the control lever in different positions and move the car. If the engine speed suddenly increases when the automatic transmission shifts to a certain gear but the vehicle speed does not increase accordingly, that gear is slipping. The higher the engine speed, the more severe the slippage.
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