The Vacuum Is Not Maintained After The Pump Is Switched Off; The Pumping Speed Is Poor; There Is An External Oil Leak - Edwards A373-30-940 Instruction Manual

5.11.6

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.

5.11.7

The pumping speed is poor

The connecting pipelines are too small in diameter.

The connecting pipelines are too long.

The inlet-filter is blocked.

5.11.8

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.

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A373-10-880 Issue R
Page 29