If you ride bicycles regularly, at some point you are going to need to refill a tire or a tyre's inner-tube with a bicycle pump. Trek Bicycles makes a series of bicycle pumps under the Wrench Force brand. Over time, the pump's o-rings wear out, its handles get sticky, and its hoses crack, prompting the need for repairs. The good news is a bicycle pump is simple in design, which makes it repairable in a home workshop.
Open up the valve cap on the end of the hose using the adjustable wrench to unscrew it from the hose. Remove the thin, black rubber o-ring set around the inside edge of the valve with the tweezers.
Insert the replacement o-ring into the hosing using the tweezers and screw the valve cap back into position.
Inspect the entire length of the hose. Look for cracks, dry rot, or erosion around the connection points at the valve and pump barrel. If present, remove the hose by unscrewing the hose clamps at the barrel and at the valve. Pull the hose off the barrel nozzle and the valve off from the end of the hose.
Push one end of the replacement hose onto the barrel nozzle, then slip the hose clamp over the hose and push it over the barrel nozzle. Screw the hose clamp tight to secure the hose to the pump barrel. Slide the other hose clamp onto the hose, the push the valve cap onto the hose. Slide the clamp onto the valve nozzle and screw it tight.
Pull the pump handle up and spray the dry lubricant onto the handle shaft. Push up and down several times to get the lubricant spread over the pump shaft. Wipe away any excess spray-on from the pump barrel.