Page History: Scroll Saw Air Pump Rebuild
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Page Revision: 2008/04/11 20:22
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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](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair1.jpg)
Here's the pump diaphragm and push block that works against a cam in the shaft. Inspect for wear.
![Image](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair3.jpg)
Remove the two end plugs. Be careful here as there are some very whispy light springs in there.
![Image](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair4.jpg)
Here's the diaphragm spring that keeps tension on the steel/leather diaphragm.
![Image](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair5.jpg)
A dental pick is being used to clean out all the grease and impacted sawdust around the valve seat.
![Image](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair6.jpg)
Here's the whole mess typical of 20 years of use.
![Image](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair7.jpg)
A diaphragm return spring that was pretty dirty
![Image](GetFile.aspx?File=ScrollSawAirPumpRebuild%2faSSair8.jpg)
All better now. Cleaned flapper valve return springs, clean phenolic valves, and cleaned end caps.
![Image](GetFile.aspx?File=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.