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Page Revision: 2008/12/25 14:46


How to Rebuild a Scroll Saw Air Pump

by Bob Vaughan{Reference:http://owwm.org/viewtopic.php?t=28127|http://owwm.org/viewtopic.php?t=28127}

The air pump on most old Delta and Powermatic scroll saws generally needs a cleaning and rarely any new parts. Here's the sequence using a Powermatic 95, but the Delta saws are very similar.

Here's the pump area looking up into the bottom air intake area. Remove the 4 screws holding on the pump housing.

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Here's the pump diaphragm and push block that works against a cam in the shaft. Inspect for wear.

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Remove the two end plugs. Be careful here as there are some very whispy light springs in there.

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Here's the diaphragm spring that keeps tension on the steel/leather diaphragm.

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A dental pick is being used to clean out all the grease and impacted sawdust around the valve seat.

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Here's the whole mess typical of 20 years of use.

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A diaphragm return spring that was pretty dirty

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All better now. Cleaned flapper valve return springs, clean phenolic valves, and cleaned end caps.

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For re-installation, I'll run a couple pieces of all thread to hold the position of the shaft housing so all things can be aligned and assembled to the lower plunger shaft.

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