The Pump Surface Temperature Is Above 100 °C; The Vacuum Is Not Maintained After The Pump Is Switched Off; The Pumping Speed Is Poor; There Is An External Oil Leak - Edwards E2M28 Instruction Manual

7.4 The pump surface temperature is above 100 °C
▪ The ambient temperature is too high.
▪ The cooling-air supply is insufficient or is too hot.
▪ The cooling-air supply is blocked.
▪ The electrical supply voltage is too high.
▪ The exhaust filter or exhaust line is blocked.
▪ The oil level is too low.
▪ The pump is filled with the wrong type of oil.
▪ The oil is contaminated.
▪ The process gas is too hot or the throughput is too high.

7.5 The vacuum is not maintained after the pump is switched off

▪ The gas-ballast control is open.
▪ O-ring(s) are damaged or missing.
▪ The shaft seals have deteriorated.

7.6 The pumping speed is poor

▪ The connecting pipelines are too small in diameter.
▪ The connecting pipelines are too long.
▪ The inlet-filter is blocked.

7.7 There is an external oil leak

▪ The oil pump shaft seal is worn or damaged.
▪ The oil box gasket has deteriorated.
▪ There is an oil leak from gas-ballast control.
▪ There is an oil-leak from the drain-plug.
A37310880_V - Fault finding
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