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Wrench Floor Pump Gravity Controlled Valve?
I've got a Wrench Floor Pump with a dual presta-shrader pair of holes on the head and a valve internal to the head that switches between holes. I thought the valve was controled by whichever hole had something to clamp on. The pump sometimes fails to switch to the correct hole-I thought it was a case of intermittent failure. Yesterday, I noticed the pump switches to shrader if I hold the holes facing up when unpressurized, presta if the holes are facing down-although it sometimes needs a tap to get the valve to switch over. Once pressurized, it seems to lock into whatever valve type was started from depressurized. Is this the way this pump is supposed to work, or have I got some funky intermittent failure going on here? If this is a common malfunction, is there a remedy? -- meb |
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Wrench Floor Pump Gravity Controlled Valve?
On Sep 10, 6:29 am, meb
wrote: I've got a Wrench Floor Pump with a dual presta-shrader pair of holes on the head and a valve internal to the head that switches between holes. I thought the valve was controled by whichever hole had something to clamp on. The pump sometimes fails to switch to the correct hole-I thought it was a case of intermittent failure. Yesterday, I noticed the pump switches to shrader if I hold the holes facing up when unpressurized, presta if the holes are facing down-although it sometimes needs a tap to get the valve to switch over. Once pressurized, it seems to lock into whatever valve type was started from depressurized. Is this the way this pump is supposed to work, or have I got some funky intermittent failure going on here? If this is a common malfunction, is there a remedy? -- meb I've noticed the same on my Wrench Force pump head and the same head I've seen on other pumps. I took mine apart (just prerssed out the aluminum pivot shaft) and found there's a ball valve between the two holes: it falls away from (and blocks) whichever hole you're not using. Kind of clever really. But like yours, mine didn't block the right hole sometimes. I added a bit of TriFlow (there's probably a better lube for plastics out there) to help it move more freely, thinking it might be sticking if it dried out a bit, and it seemed to work a little better. Otherwise I like that pump head because I can switch the Presta and Schraeder rubbers and use the head "as is" to pump disc wheels and tri spokes (no "crack pipe" adapter needed). I'm pretty sure you can get a replacement head from Trek dealers (might be part of a replacement hose?). Maybe it's under warranty? |
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Wrench Floor Pump Gravity Controlled Valve?
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