What Causes a Transmission to Leak About a Dozen Drops of Oil After Sitting Overnight?

1 Answers
MacAdelyn
07/29/25 3:19pm
The reasons for a transmission leaking about a dozen drops of oil after sitting overnight are as follows: 1. Oil leakage from the motor shaft seal: Aging or deformation of the oil seal, detachment of the oil seal spring, or incorrect installation direction of the oil seal can all cause the oil seal to lose its oil-blocking function. Replace the aged or deformed oil seal. Also, pay attention to the installation direction of the oil seal; the side with the spring ring should face the oil side. If the motor shaft is worn or dented, causing a loose fit with the oil seal and resulting in leakage, replace or repair the worn or dented motor shaft. 2. Oil leakage from the housing: If the connecting surface of the housing is damaged, add an appropriately thickened gasket at the damaged area. If leakage persists, perform welding repair. If the sealing gasket is damaged, replace it with an identical one. 3. Oil leakage from the bearing: Loose fastening screws should be tightened in a straight-line sequence in stages, but avoid over-tightening to prevent damage to the gasket. Additionally, if the transmission vent is blocked, the transmission cannot exchange air with the outside during operation, leading to increased internal pressure and oil leakage from the blocked area. Keep the transmission vent clear to reduce internal pressure and prevent oil leakage.
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