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What Causes High Oil Temperature in BMW?

1 Answers

DelKate

07/29/25 9:26pm

Reasons for high oil temperature in BMW: Transmission oil level too high or too low: Check the oil level in the transmission oil pan and adjust the transmission oil to the specified level. Damage to the transmission pump or poor oil suction line flow: The function of the transmission pump is to control the high-pressure oil generated by the torque converter and distribute it to the second shaft assembly through the transmission distribution valve to achieve the forward and reverse movement of the loader. Damage to the transmission pump can result in poor oil supply to the transmission. As the loader's usage time increases, wear intensifies, leading to internal leakage in the transmission pump, causing the transmission pressure and mechanical efficiency to fall short of requirements. This results in poor oil supply in the suction line, preventing the oil from lubricating the moving parts and increasing friction, which can also cause system overheating. It is important to note that air leaks or blockages in the transmission pump suction line can also lead to insufficient flow, resulting in excessively high oil temperature. Deterioration of hydraulic transmission oil: If the hydraulic transmission oil in the transmission deteriorates, it fails to provide lubrication, leading to excessive wear in the system and high temperatures in internal components. It is recommended that users replace the hydraulic transmission oil every 1,500 hours of loader operation.

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