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You're not alone. The Experimental Aircraft Association's "Airventure" ("Oshkosh") fly-in was cancelled too! >In the meantime, stay safe, have a great summer and we’ll see you in 2021. I hope so, but our masters and rulers are conjuring up all kinds of scary stuff and new despotic dictatorial...

All the more reason to stick with the OEM greenie until something better comes up. I usually pump to only 3000 psi but I did take the Viton V90 up to 4000 with a dead head hose plug to test it. Though it was just a brief test, I think it might have started the Viton V90 downhill, because it...

I'm playing with regulator shim stacks so I'm doing a lot of pumping on my Mk4 and I have plenty of opportunities to try new piston o-rings. The last Viton V90 didn't last very long and the x-ring ebay seller never responded to my question about durometer so I decided to just try a FKM 75...

Yes--the green OEM ring sold by Hill is tough to meet or beat, because you need a shore 90A durometer o-ring to not fail fairly quickly from extrusion. Perhaps if you don't run the pump at very high pressure very often, you might get away with less than D90 . Also you'll probably want something...

This thread is a bit old but I figure people will always have a need for pump repair information. I too am a heavy Mk4 user. Funny, but I've never replaced #18 in that diagram. I got my pump about 4 or 5 years ago and only pumped it a few hundred cycles before it quit working (no compression /...

As I recall on my P17, the screw didn't do anything because it would not screw into the trigger shoe far enough. Right from the factory, the screw seated on a counter bored ID "shelf" in the trigger shoe too soon to be of any use. Rather than trying to find a longer screw, I recall that I had to...