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This video will demonstrate how toreplace the chain with master link on a Schwinn Airdyne.
First remove the cotter pin and clevis pin from the user's right handlebar. Then lower the connecting arm and handlebar.
Caution: be sure to hold the handlebar as it will come loose after removal of the above parts.
Remove the connecting arm and pedal and crank arm by removing the wedge pin. To simplify this process loosen the nut and tap on it with a small hammer until the pin is loosened.
Remove the nut, wedge pin, crank arm and connecting arm.
Next remove the chain guard; there are three screws attaching it as shown in the video.
Remove the chain by locating the master link. Remove the lock pin and the cover, and then disconnect the chain.
Place the new chain on the sprockets as shown in the video.
Install the master link, cover and lock.
Re-install the chain guard and attaching screws.
Re-assemble the connecting arm to the handlebar and eccentric.
Be sure the brass bushing is installed in the front inner side of the connecting arm before installing the clevis pin and cotter pin.
Install the crank arm with pedal.
Be sure when completing this step that the crank arm is installed in the opposite position as the users left side crank arm.
Link to Support page for Schwinn Fitness below. There's a link for manuals as well as contact info if you need help identifying your model. Customer Service
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
http://www.fitnessrepairparts.com/diagram/113 This is an on-line link to the schematics for your Airdyne. The large nut between the handlebar (foot part) and the wheel hub are supposed to be pretty snug. Tighten the nut using a 6 or 8 adjustable wrench and tighten the nut clockwise. Be careful not to tighten too hard or the handlebar will not move at all. This is a very easy fix.
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