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CAT320 No Oil Pressure Digging Machine To Do?

1. unscrew oil induction, found on an oil pressure gauge is connected directly to read oil pressure.
2. oil filter oil cannot be 8 kilograms, usually have a pressure relief valve in the oil, 7.5 kg, the pressure relief valve will work.
3. the main reason is not the (relief valves are not working properly), oil pump and pressure relief valve on the radiator.
4. cylinder head was not up on the oil, mainly because of cylinder block and cylinder head parts of a series of oil duct clogging.
5. check engine oil on the cylinder head rocker arm, directly after starting the engine cover is open when the valve to see if the oil on.