1, the phenomenon of failure
The replacement of the new hydraulic fluid soon deteriorated.
The automatic transmission is too hot and smokes from the fuel filler.
2, the cause of the failure
Improper use of the car, often overloaded, such as often used for trailers, or often rapid, speeding and so on.
The hydraulic oil radiator line is blocked.
The pressure limiting valve to the hydraulic oil radiator is stuck.
Clutch or brake free clearance too
The main line oil pressure is too low and the clutch or brake slips during operation.
3, fault diagnosis and elimination
Let the car run at low speed and min. After the automatic transmission reaches the normal operating temperature, check the temperature of the hydraulic oil radiator of the automatic transmission during the engine running. Under normal conditions, the temperature of the hydraulic oil radiator can reach about 60°C. If the temperature of the hydraulic oil radiator is low, it means that the tubing is blocked or the pressure limiting valve to the hydraulic oil radiator is stuck. In this way, the hydraulic oil is cooled in time and the oil temperature is too high, resulting in deterioration.
If the temperature of the hydraulic oil radiator is too high, it means that the free clearance of the clutch or brake is too calibrated. The automatic transmission should be disassembled and adjusted.
If the hydraulic oil temperature is normal, the main oil pressure should be measured. If the oil pressure is too low, check the adjustment of the throttle cable or throttle position sensor. If the throttle cable or throttle position sensor is installed properly, the automatic transmission should be disassembled to check if the oil pump is worn out or not, whether the main oil pressure regulating valve and the throttle valve inside the valve plate are stuck, and whether the main oil line has oil leakage. .
If the above checks are all normal, the fault may be caused by the vehicle constantly overloading or failing to use the proper hydraulic fluid. In this regard, the hydraulic oil can be fully discharged, adding the specified grade and quantity of hydraulic oil.
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