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?