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First, of course, make sure you have released the pump lever before removing from the valve. If you were able to put the pump on the valve before engaging the lever it should be just as easy to remove once you have put the lever back to the initial position. If it is still difficult try slightly unscrewing the parrt around the seal.
Are you really asking about a Schwinn 227p recumbent exercise bike you are considering purchasing second hand and want to know how old THAT bike is? If so . . . ask the seller if he / she can tell you how old the bike is.
Or, do you have such a bike and want to know how old it might be? If so, and if you can locate a serial number on the bike, this website may prove helpful: https://bikehistory.org/serial-number.html
There are only two types - presta and schrader. If the instructions named them you could just Google them for descriptions and all kinds of other answers. The schrader is what we think of as the automotive style.
Do you have a presta or schrader valve on you bike tube? A schrader is a standard valve, presta has a little nut that has to be loosened to add air. Your pump has both heads or adaptors (I don't know which model you have). You should have instructions with your pump to explain how to use it, if not go to www.ehow.com and you can read all of the instructions, no use me repeating what you can read on your own.
There are two types of valve stems, schrader ( like the valve stems on your car ) and presta.
See images on this page http://www.sheldonbrown.com/brandt/presta-schrader.html
Since you are asking I assume you have presta valves.
You can get an adapter to convert the presta valves for use with a schrader pump.
Unscrew the small knurled nut on top of the presta valve to open it, press down and release the small top to ensure the valve is free to move.
Snug up the top when it is full.
From the Schwinn website:
"If you bought your Schwinn at an independent bike shop, please contact the shop to help you get replacement parts.
If you bought your Schwinn at a big box retailer or sporting goods store, please call us to purchase parts - you'll need a major credit card and must be 18 or older. 800-626-2811"
The 2nd option would also apply if you purchased the trailer used. FAQ Support Schwinn Bicycles
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