7.4 The pump surface temperature is above 100 °C
▪ The ambient temperature is too high.
▪ The cooling-air supply is insucient or is too hot.
▪ The cooling-air supply is blocked.
▪
The electrical supply voltage is too high.
▪
The exhaust lter or exhaust line is blocked.
▪ The oil level is too low.
▪
The pump is lled 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 aer the pump is switched o
▪
The gas-ballast control is open.
▪
O-ring(s) are damaged or missing.
▪
The sha seals have deteriorated.
7.6 The pumping speed is poor
▪
The connecng pipelines are too small in diameter.
▪ The connecng pipelines are too long.
▪ The inlet-lter is blocked.
7.7 There is an external oil leak
▪ The oil pump sha 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.
Page 40
A37310880_V - Fault nding
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