A344-02-880 Issue J
Page 34 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.13.3 The pump is noisy
z The motor fan-cover is damaged
z The motor bearings are worn
z The oil is contaminated with solid particles
z The motor coupling is loose
z A blade is sticking.
5.13.4 The pump is too hot
z The ambient temperature is too high
z The cooling-air supply is insufficient or is too hot
z The electrical supply voltage is too high
z The outlet-filter or the outlet pipeline is blocked
z The oil-level is too low
z Yo u hav e f i l led th e pump w i t h the w r o n g type o f o il
z The oil is contaminated
z The process gas is too hot or the throughput is too high.
5.13.5 The vacuum is not fully maintained after the pump is switched off
z The gas-ballast control is open
z Damaged or missing 'O' ring
z Anti-suckback valve faulty
z Shaft seals damaged
z Exhaust valve damaged
5.13.6 The pumping speed is poor
z The connecting pipelines are too small in diameter
z The connecting pipelines are too long
z The inlet-filter is blocked
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