4. Oil filter failure. Oil filter is used to filter dust and impurities in the oil circuit, after a period of time is easy to clog, clogging caused by poor oil return caused by the host high temperature.

5. Failure of the disconnecting valve. Oil cut-off valve is through the storage tank air pressure to control its reciprocating movement of oil spray, if the failure caused by the oil circuit is not smooth, resulting in high oil temperature; debris blocking the oil circuit or control of the air circuit, resulting in the oil cut-off valve closure does not spray oil, but also cause the host head due to a lack of oil or oil poor heat dissipation caused by the host temperature is high.

6. Insufficient lubricating oil, dirty oil cooler, clogging, can cause high temperature.

7. Cooling fan failure, air cooler blockage, exhaust resistance is too large, resulting in poor heat dissipation caused by high temperature. Should clean the cooler external dust and internal oil.