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.
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O-ring(s) are damaged or missing.
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The shaft seals have deteriorated.
7.6 The pumping speed is poor
▪
The connecting pipelines are too small in diameter.
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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.
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A34310880_T - Fault finding
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