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Mcostello
04-16-2009, 10:22 PM
I have a porta power pump, an air over hydraulic pump. Housing piston reciprocates in has worn and piston ring won't seal properly. Is there any way to cast a new ring in polyurethane or other suitable material as replacement parts are not available. Used pumps are going for around $100+ shipping and I hate to throw out a good pump.

Tim Clarke
04-17-2009, 12:54 AM
I assume that you've already taken this apart. What is the original material, and what size is it? Perhaps a standard poly hydraulic cylinder seal would work.

TC

ahidley
04-17-2009, 07:40 AM
Its probally made of the same material as the oil-less air compressor piston rings.

Mcostello
04-17-2009, 10:27 PM
Thank you for the ideas, Mark

Tobias-B
04-18-2009, 09:29 PM
What about machining one out of UHMW nylon or something similar?
Or maybe something even denser...

Lots of those 'soft but strong' plastics will machine pretty precisely...

t

Mcostello
04-18-2009, 11:38 PM
Was going to use some Rulon I had laying around until I realized that it has to stretch over the piston.:)

ahidley
04-20-2009, 07:41 AM
teflon would be the choice I believe