Automobile hydraulic oil is easy to deteriorate.

Automobile hydraulic oil is easy to deteriorate.

1, failure phenomenon

The new hydraulic oil after replacement will deteriorate quickly after use. The automatic transmission temperature is too high, and the oil filler is smoking.

2. Reasons for failure

Improper use of cars, often overloaded, such as often used in trailers, or often speeding, speeding.

The pipeline of hydraulic oil radiator is blocked. The pressure limiting valve of hydraulic oil radiator is stuck. The free clearance of the clutch or brake is too small, the oil pressure in the main oil circuit is too low, and the clutch or brake slips when working.

Step 3 resolve disputes

Let the car run at medium and low speed 10 minute. After the automatic transmission reaches the normal working temperature, check the temperature of the hydraulic oil radiator of the automatic transmission when the engine is running. Under normal circumstances, the temperature of hydraulic oil radiator can reach about 60℃. If the temperature of the hydraulic oil radiator is low, the oil pipe is blocked or the pressure limiting valve leading to the hydraulic oil radiator is stuck. In this way, the hydraulic oil is cooled in time, and the oil temperature is too high to cause deterioration.

If the temperature of hydraulic oil radiator is too high, it means that the free clearance of clutch or brake is too small, and the automatic transmission should be disassembled for adjustment.

If the hydraulic oil temperature is normal, measure the oil pressure in the main oil circuit. 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 normally, disassemble the automatic transmission, and check whether the oil pump is excessively worn, whether the pressure regulating valve and throttle valve of the main oil circuit in the valve plate are stuck, and whether the main oil circuit leaks oil.

If all the above checks are normal, the fault may be caused by the frequent overload of the car or the failure to use the appropriate brand of hydraulic oil according to the regulations. In this regard, all hydraulic oil can be discharged and added according to the specified brand and quantity.