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I have a Specialized Switch Hitter I have used for several years on both Presta and Schrader valves. Recently, my wife tried to inflate her tubes (Schrader valve) and could not get the pump to function. When I tried on my Presta valves, I experienced the same odd behavior she did, namely:

  • The handle requires too much force to depress when the chuck is on the valve.
  • The inline gauge registers a constant zero.
  • The valve is letting air out. I can let air out of the tube easily by bleeding off pressure using the little release valve on the handle.
  • When the chuck is not engaged with a valve, I can pump normally. I can't keep my finger on the chuck to build up any pressure, but air is definitely coming out.

I managed to partially fix the problem by disassembling the head and reassembling it, but now the inline pressure gauge is stuck at 60 psi even if I put enough air into it to get a tire to 130 psi. Does anybody know what might cause this problem?

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I disassembled the head and put it back together, and it worked. I still have no idea what was wrong. –  Dwindlehop Aug 18 '13 at 1:23
2  
I had my Topeak floor pump fail in June. On inspection, the pin that secures the chuck lever had slipped out of one end of the chuck body, allowing the lever to be cockeyed. Unfortunately this resulted in damage to the gaskets (since I tried at least a dozen times to get it to work, each time abrading the center seal), and I had to replace the chuck. –  Daniel R Hicks Aug 18 '13 at 2:38
2  
@Dwindlehop suggest you move your comment to an answer, then mark your answer as "the" answer. That's site etiquette, it also makes it more clear that you solved your problem already. –  PeteH Aug 18 '13 at 10:58
    
@PeteH The fact is the issue is not completely fixed. Last I used the pump the gauge was stuck at about 60 psi. I put enough air into it to pump my tires to 130 psi or so, but the gauge barely wavered. I still need to figure out what needs replacing on this pump. –  Dwindlehop Sep 5 '13 at 17:29
    
sorry. I assumed from your previous comment that you had sorted the problem. It was the phrase "...and it worked" that did it ;-) –  PeteH Sep 5 '13 at 18:14

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