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I love my Schwinn Evo Comp AirDyne. After 2 years it suddenly developed a bad squeak and about .5" of increased play in the pedals (ie the pedal could rotate back and forth about .5" before turning the fan). Both these symptoms were caused by a broken spring in the chain tensioner. (Schwinn pn 13000371. See part 80 in blowup 5 of http://www.fitnessrepairparts.com/diagram/114 ~$9).
To replace this:
disconnect the right hand (as you sit on it) connecting arm (ie the piece that connects the pedal to the big handle) from the lever arm (ie the big handle you pull back and forth) by removing the connecting bolt with an Allen head wrench and an adjustable wrench. Note the order of the three internal washers as you remove the connecting bolt. Rotate the connecting arm towards the back of the bike to get it out of the way.
remove the four phillips head bolts that hold down large right hand plastic cover. With the connecting arm out of the way this cover can be pulled far enough out to gain access to the chain tensioner.
remove the broken spring and replace it. I fashioned a similar spring with less tension which seems to work as a kluge. The original spring broke at the outermost loop, so I might have been able to reuse it by just bending down another loop.
could lube the chain while you are in there, but you can also lube it anytime from the other side
The part that holds the handle bars on is called the Head-set this should have adjustment screw/screws they may have a small plastic cover over them to prevent rust. They are usually require an Allen wrench to tighten them. If they become loose again then get some locktight and use this on the handle bars and the threads of the bolts before you tighten them up.
If you are talking about the handle-bar stem, the bolt you need to tighten is right in the middle of the post. It may have a snap-on plastic cover over it. This will be the head of a long bolt that reaches down inside of the stem where the nut is shaped as a wedge that serves to tighten inside the tube of the front fork. If you are talking about the the seat-post, then your seat-post might be of too small diameter.This page shows a good picture of the handle-bar stem bolt and wedge nut. http://www.bikewebsite.com/bikeoh.htm
If they are tuning left and right the the center bolt on the top of the goose neck will do it. If they are loose at the goose neck and moving forward and backward then you need to tight the bolt underneath at the point the bars are in the neck. If you can't tighten it anymore you have two choices but you must first determine if it is the handle bars or the goose neck that is stripped. If it is the handle bars then replace them and if it is the goose neck replace that. The other think you can do is make a shim from a piece of metal and wrap it around the bar and tighten the goose neck on that again.
Tighten the bolt that is in the center of the handlebar piece. As well as the nuts/bolts on the lower part of the shaft that comes up and connects to the handle bars. Hard to explain. But just align things right, and tighten everything up on the entire wheel/handlebar assembly.
There should be a top cup cover. You have to pry it up and you will find the screw underneath. If there is no cover, the screw end must come out of stem. You need to undo this screw till the stem gets loose. You will need to undo the steerer bearing as well. Special bike tools are essential for this job.
The battery cover is no longer made since this bike was last built in the late 1980's. I would recommend giving the man a timer/watch. I do have one of these little black round batter covers, and would sell for $25. However, all it does is create a timer for the rider. He already can use the analog computer to see his mileage, load, and can re-set the lower mileage to zero every workout. All the battery cover will allow is for him to set a timer for how many minutes he wants to workout for. Or he can pust the start button to time his workout. (my email is firstname.lastname@example.org)
The bolt you see right above where the handle turns is the handle bar clamp. And if it's been on a while you'll need to take a piece of strong wood and hold it on the bolt, when it's lossened a bit, and hit it with a hammer to fully loosen the handle bars.
Hand brakes should come with clamps to put on the hadle bars, and if you look at bikes that have hand brake, you'll see how to route the cable. The only problwem is if your bike doesn't have the part taht the brake would screw to at the wheel. Then you'll have to improvise.
There should be a bolt on the frame at the base of the handle bar stem. There should also be a bolt on the top of the handle bar stem. If these are both tight and secure. The odds are the expansion clamp that's connected to the base of the handle bar (part that goes into the frame) has broken.