Originally Posted by Altair 4

So I have Serfas tcpg tire pump which I very much like. The head works on both Presta and Schrader stems without having to change anything.

The other week, I was helping my neighbor's Girl Scout troop get ready for a group ride. After inflating a couple of really low tires, the resistance in the handle was increasing and each down stroke was making a squeaking / squealing noise. It's as the cylinder heated up that it got harder and harder to use. It got to the point where I gave up on it and starting using a Ryobi battery-powered pump.

Simple tool, right? What can go wrong? Before I start taking it a part, I was wondering if anyone had any suggestions on a fix? Does it need oil or lubricant on the end of the piston? THe thing is making me feel stupid.

Altair 4