(1) Causes of excessively high torque converter oil temperature?
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① Burned transmission gear pump, excessively low or high oil level in the transmission tank, clogged oil pan filter, or clogged filter element, insufficient oil supply, resulting in insufficient fluid flow to carry away heat, thus causing excessively high oil temperature.
② Loose engine belt, insufficient exhaust volume, slow oil heat dissipation. Or low water level in the radiator, or ruptured pipes in the engine oil cooler, resulting in insufficient coolant and slow cooling. If engine oil is mixed in the radiator, it can generally be determined that the oil cooler pipes are ruptured.
③ Since the transmission and torque converter share the same oil supply system, if the pressure of each gear in the transmission is too low (below 0.8MPa), it will cause the gear friction plates in the transmission to slip and heat up, which will also cause excessively high oil temperature. Troubleshooting methods:
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④ If 24 rollers in the overrunning clutch (two-shaft assembly) get stuck and cause mechanical friction (even though the system pressure is normal), the oil temperature will rise sharply. 。
Troubleshooting method: Replace the second shaft assembly.
⑤ If the rotating oil seal installed on the mating surface between the inner hole of the transfer gear and the guide wheel seat is damaged, a large amount of working oil inside the torque converter will leak internally. A large amount of working oil will flow directly back to the oil pool (in the transmission) without passing through the cooling system. This phenomenon will also cause the oil temperature of the torque converter to rise sharply.
Solution: Replace the rotating oil seal.
⑥Improper operation, such as frequently increasing the engine throttle and overloading the loader for a long time, or operating in braking conditions for an extended period, can also cause the oil temperature to rise sharply.
