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.
Here's the pump diaphragm and push block that works against a cam in the shaft. Inspect for wear.
Remove the two end plugs. Be careful here as there are some very whispy light springs in there.
Here's the diaphragm spring that keeps tension on the steel/leather diaphragm.
A dental pick is being used to clean out all the grease and impacted sawdust around the valve seat.
Here's the whole mess typical of 20 years of use.
A diaphragm return spring that was pretty dirty
All better now. Cleaned flapper valve return springs, clean phenolic valves, and cleaned end caps.
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.
