Watch for circlips or grubscrews that need to be undone first. Fans usually can be levered off using two large screwdrivers. Seized bolts in alloy housings can sometimes be freed with a short, intense burst of heat from an oxy torch on the housing while keeping pressure on the bolt.ĭon't forget the wave washer behind the fan-end bearing when you re-assemble. (1 litre of diggers hydrochloric acid in a bucket of water) Alloy impellers are very rare, but if you have one, then don't try this method. If impellers have a lot of mineral build-up on them, it can be removed by immersing in a weak acid solution overnight. (something apprentices seem to get wrong a lot) On smaller pumps, the impeller screws on to the shaft with a normal right-hand thread. Rusted motor housings (usually at the pump end) are usually the end of the pump. Rusted shafts at the mechanical seal, and rusted bearing housings, need to be replaced. Smear a light coat of silicon grease or vaseline on all rubber seals but make sure you don't get any on the ceramic wear-surface of the mechanical seal.
Make sure all body seal surfaces are spotless before reinstalling o-rings and rubber seals. Of course all pumps are different, but I do have some general tips for repairing/servicing pumps. Used to work for a Davey/Grundfos agent repairing pumps.
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