Piston pump check valves

WayneIA · Jun 10, 2018

By chance there wouldn't be anybody relatively close by that would have the special tool to remove the intake check valve seats from a NAA piston pump(9/16 pistons). Not really inclined to spend $65 for the tool that I will probably only use once.

Mike(NEOhio) · Jun 10, 2018

If you have a tap you can cut a little thread and use a screw, washer and nut. I think I used a 1/4-28 tap. The seats are a little hard and not good for the tap so just cut enough thread to get the screw to bite. Once they move a little they fall out. That's assuming it's the same type pump as the late 2/3000s.

WayneIA · Jun 11, 2018

Thanks for the tip. Had a tap in hand but did not force the issue. Pump works fine with cold oil but real lazy about lifting a load when warmed up. Can't see a real problem except check valves don't seam to hold penetrating oil vary long. Will try a little harder

Mike(NEOhio) · Jun 11, 2018

Mine was OK in warm weather but chattering slow or no lift when cold. The valves looked OK but the problem went away after a pump rebuild.

JMOR · Jun 11, 2018

George's homemade seat puller & another posters approach is mentioned too.
http://forums.yesterdaystractors.com/viewtopic.php?p=3558785&highlight=#3558785

WayneIA · Jun 11, 2018

Well, I made a special punch out of and old rake tooth and drove them out from the back side. Worked pretty decent. Will report back on the function of the pump later, after grandkids ballgames, wedding showers and other great/ grandparent "functions"

Piston pump check valves

WayneIA

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Mike(NEOhio)

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WayneIA

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Mike(NEOhio)

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JMOR

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WayneIA

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