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#1
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Dual valve floor pump only pushes air out the Schrader valve hole
I've got a cool little Wrench Force floor pump that will accept
Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? |
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#2
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Dual valve floor pump only pushes air out the Schrader valve hole
Brad Ford wrote:
I've got a cool little Wrench Force floor pump that will accept Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? I've had the same problem with my Wrench Force pump. Quite annoying! It's especially bad when trying to inflate from 0, e.g. a completely empty inner tube. It seems to me that the pump sometimes "corrects itself" if I install it on a partially inflated tube. Otherwise I get frustrated and bang the pump head on something hard until it behaves. If it keeps it up I'd ask for a new head from the dealer. They're easy to remove and replace without tools. Good luck! |
#3
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Dual valve floor pump only pushes air out the Schrader valve hole
Brad Ford wrote: I've got a cool little Wrench Force floor pump that will accept Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? I have a similar WF pump, and have had a similar problem. It's most noticeable when inflating a new presta tube. I've had good luck with either blowing a little air into the tube by mouth or pushing the valve stem into the pump far enough to force the valve open by contact rather than relying on air pressure. JLS |
#4
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Dual valve floor pump only pushes air out the Schrader valve hole
Brad Ford wrote: I've got a cool little Wrench Force floor pump that will accept Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? My Beto brand floor pump sometimes balks at starting to inflate a Presta tube. I find if I put my finger against the tube's valve (from the far side) to increase the back-pressure, the pump catches on and inflates it properly. |
#5
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Dual valve floor pump only pushes air out the Schrader valve hole
I've got a cool little Wrench Force floor pump that will accept
Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? It's a fairly common problem with the one-head pump designs. You can often get it to work if you strike the head against the ground pretty sharply, which unsticks the internal gadget that detects which valve is in use. But a new pump hose will probably take care of the problem too, and it's quite likely to be considered a warranty issue. As others have mentioned, this typically happens only when there's zero air in the tube, so inflating just a tiny amount with a hand pump will usually work. Someone else suggested blowing a bit of air into the tube by mouth, but I've tried that a couple times without success. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com |
#6
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Dual valve floor pump only pushes air out the Schrader valve hole
In article . com,
Brian Huntley wrote: My Beto brand floor pump sometimes balks at starting to inflate a Presta tube. I find if I put my finger against the tube's valve (from the far side) to increase the back-pressure, the pump catches on and inflates it properly. I've had the same problem with my Beto for about 2 years; and have been the using the workaround you described - works every time. Luke |
#7
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Dual valve floor pump only pushes air out the Schrader valve hole
Mike Jacoubowsky wrote: I've got a cool little Wrench Force floor pump that will accept Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? It's a fairly common problem with the one-head pump designs. You can often get it to work if you strike the head against the ground pretty sharply, which unsticks the internal gadget that detects which valve is in use. But a new pump hose will probably take care of the problem too, and it's quite likely to be considered a warranty issue. As others have mentioned, this typically happens only when there's zero air in the tube, so inflating just a tiny amount with a hand pump will usually work. Someone else suggested blowing a bit of air into the tube by mouth, but I've tried that a couple times without success. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com There is no need to hit anything on these chucks. Simply cover the valve hole that you intend to use with your thumb, and start pumping. The back pressure will "free" the valve to the correct postion. You can then mount the chuck on the tube valve (even if there is no air in the tube) and start pumping successfully. |
#8
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Dual valve floor pump only pushes air out the Schrader valve hole
Thanks all for your suggestions. I got the WF pump to un-Schraderize
itself by inserting the valve, and holding my thumb against the back side of the tube (the side opposite the valve) while pumping with my other hand. -B. |
#9
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Dual valve floor pump only pushes air out the Schrader valve hole
Worked for me too on a beto. Thanks everyone!
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#10
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Dual valve floor pump only pushes air out the Schrader valve hole
On Saturday, February 4, 2006 at 5:36:43 AM UTC-5, damyth wrote:
Mike Jacoubowsky wrote: I've got a cool little Wrench Force floor pump that will accept Schrader or Presta. I've used it for over a year exclusively to inflate my Presta road tubes. Got the kids bikes for Christmas, pumped them up (Schrader valves), and now (several weeks later) the pump won't blow air out the Presta hole any more. It's supposed to be "auto sensing". Is it just buggered? What would you all try to debug this problem? It's a fairly common problem with the one-head pump designs. You can often get it to work if you strike the head against the ground pretty sharply, which unsticks the internal gadget that detects which valve is in use. But a new pump hose will probably take care of the problem too, and it's quite likely to be considered a warranty issue. As others have mentioned, this typically happens only when there's zero air in the tube, so inflating just a tiny amount with a hand pump will usually work. Someone else suggested blowing a bit of air into the tube by mouth, but I've tried that a couple times without success. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com There is no need to hit anything on these chucks. Simply cover the valve hole that you intend to use with your thumb, and start pumping. The back pressure will "free" the valve to the correct postion. You can then mount the chuck on the tube valve (even if there is no air in the tube) and start pumping successfully. Thank for taking the time to post the tip. It is appreciated. |
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