What Happens If Too Much Transmission Fluid Is Added?

1 Answers
SanCarson
07/30/25 4:54am
Adding too much transmission fluid can cause issues such as oil leakage from the automatic transmission, gear shifting impact, and excessively low working oil pressure. Below are detailed explanations: Oil Leakage: If the transmission fluid level is too high, the rotating components will come into contact with the fluid during operation. Under the agitation of high-speed rotating components like planetary gear mechanisms or clutches, the fluid will expand and boil, leading to leakage from the filler hole and vent valve. Causing Gear Shifting Impact: Excessive air entering the fluid can also cause air blockage in the drain holes of the control valve body, resulting in poor drainage and leading to gear shifting impact. Causing Excessively Low Working Oil Pressure: An excessively high transmission fluid level causes the rotating components to agitate the fluid, generating bubbles. When this bubbly fluid enters the oil pump, the pump cannot establish the required oil pressure.
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