The ZF automatic transmission hydraulic oil is cooled by the coolant of the engine system. If there is a small amount of coolant entering the hydraulic oil radiator, the hydraulic oil will not be sufficiently cooled and the temperature will rise. If the hydraulic oil system does not circulate smoothly, the hydraulic oil temperature will rise too quickly. Causes of poor circulation of hydraulic oil: (1) Insufficient hydraulic oil volume; (2) Blockage of hydraulic oil pipe; (3) Blockage of hydraulic oil radiator; (4) Drain inside circulation pump. Diagnosed transmission hydraulic oil system: (1) The amount of oil is in the middle of the scale, which proves that the amount of oil is sufficient; (2) The circulating pump has a working sound, which proves that the circulating pump works, but it cannot prove whether the circulating pump is leaking oil; (3) Disconnect the tubing connector of the transmission, and the circulation pump enters the working state to observe the return flow of the tubing. The oil return flow was found to be normal, which proved that the circulating pump was working properly, and the hydraulic oil pipe and the hydraulic oil radiator were not blocked.
Diagnosis conclusions Finding causes for shortage of coolant entering the radiator of the ZF automatic transmission: (1) failure of the thermostat; (2) small pump lift of the engine; (3) blockage of inlet and outlet pipes; (4) blockage of the internal water channel of the engine; 5) Radiator internal water pipe blockage; (6) ZF automatic transmission radiator internal pipe blockage; diagnosis of engine cooling system: (1) check the thermostat, thermostat in 82 °C water can be fully open to prove the thermostat Normal operation; (2) Detect the flow of engine coolant. The engine cooling system was not equipped with a thermostat during the test. From the engine radiator return, the engine was running at idle speed. The flow of the coolant was observed. The flow rate was normal at the beginning. After about 15 L of coolant was discharged, the flow began to decrease. Through this test proved: 1 pump lift meets the requirements; 2 engine to the engine radiator outlet pipe without clogging; 3 engine block water channel circulation; 4 lack of coolant is caused by the previous engine cooling water pump components, that engine Radiator, engine radiator to the ZF automatic transmission radiator water pipe, ZF automatic transmission radiator, ZF automatic transmission radiator to the engine water pump water pipe in a certain part of the plug.
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