Scroll Saw Air Pump Rebuild

Modified on 2008/04/19 12:28 by joewells Categorized as Maintenance

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===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.

[image||{UP}ScrollSawAirPumpRebuild%2faSSair1.jpg]

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

[image||{UP}ScrollSawAirPumpRebuild%2faSSair3.jpg]

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

[image||{UP}ScrollSawAirPumpRebuild%2faSSair4.jpg]

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

[image||{UP}ScrollSawAirPumpRebuild%2faSSair5.jpg]

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

[image||{UP}ScrollSawAirPumpRebuild%2faSSair6.jpg]

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

[image||{UP}ScrollSawAirPumpRebuild%2faSSair7.jpg]

A diaphragm return spring that was pretty dirty

[image||{UP}ScrollSawAirPumpRebuild%2faSSair8.jpg]

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

[image||{UP}ScrollSawAirPumpRebuild%2faSSair9.jpg]

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.

[image||{UP}ScrollSawAirPumpRebuild%2faSSair10.jpg]

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