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Silca Super Pista problem(8 posts)

Silca Super Pista problem12x23
Dec 30, 2003 4:40 PM
My Super Pista looses pressure (or at least the gauge says so) when inflating my tires. Resistance when pumping feels the same as usual, but the gauge shows psi is bleeding when at the bottom of the pump stroke.

I've removed the little plunger in the base and cleaned everything up real good, was advised to do this once before and it cured the problem, but didn't help this time.

I was sure the leather washer was not to blame but replaced it anyway .... same problem.

Any other advice, could it be the gauge? It has the cheesy plastic gauge.
Pump head gasket or check valveMR_GRUMPY
Dec 30, 2003 7:48 PM
You may be just loosing pressure from your hose through a worn out pump head gasket. On the other hand, the check valve might be letting the air in the hose back into the pump. If you can't hear air leaking at the pump head, it's the check valve. I think your LBS can order a new check valve from QBP for a few bucks.
One other item to check out, is a crack in the hose where it attaches at the bottom of the pump. I had to cut off an inch of hose to stop a leak.
re: Silca Super Pista problemArnold Zefal
Dec 30, 2003 7:50 PM
you might try rubbing some grease or oil into the leather washer. works on their frame pumps, but I've never had one of their floor models.
May just need a new rubber grommetKerry Irons
Dec 31, 2003 5:39 PM
Your check valve may be fine. It could just be air leaking past the rubber grommet once you've finished the pump stroke.
May just need a new rubber grommet12x23
Dec 31, 2003 7:57 PM
Are you speaking of the small o-ring on the "plunger" .. sorry, I've never seen a parts list for the Silca and don't know the nomenclature. If so, would that o-ring be found in a Lowes/Home Depot, etc, or is it specific to Silca?
Silca Parts....Bixe
Jan 1, 2004 11:44 AM
Assuming that the chuck isn't leaking at the tube's valve and the hose is intact, there's not much left but the check valve. Mine occasionally sucks up some little piece of something and I generally pull the check valve out, clean it up....

Parts are pretty easy to find, and here's a link to Silca Pompe...

http://www.bikeusa.com/MERCHANT2/merchant.mv?Screen=CTGY&Store_Code=MSGI&Category_Code=FloorPumpParts

http://store.airbomb.com/ba/asp/Mc.Silca/ab/items.htm

http://www.silcapompe.it/engl/pagine/pmanometro.htm
Sorry for not being clear - it's the grommet in the brass chuckKerry Irons
Jan 1, 2004 12:57 PM
The part that goes on your valve stem. You just unscrew the cover from the brass chuck, and the grommet comes right out. You may be able to solve this problem (temporarily) by simply screwing the chuck tighter - this compresses the grommet and makes for a tighter seal around the valve stem. Also, if you have threaded stems on your tubes, switch to a non-threaded tube (Michelin is my personal preference) which gives a better seal on the pump and longer life for the grommet.
Got it !!!12x23
Jan 1, 2004 1:42 PM
In looking at the Silca site the non return valve, what I was refering to as "the plunger," was sticking again. I cleaned it up again and lubed it with a little Tri Flow. Its working fine now.

Thanks !