How to tighten belt...Vitamaster by Roadmaster

Question moved from Cars and Trucks category.

It is no longer available according to many of these articles. There are general tips only.

https://www.google.com/search?q=Vitamaster+8713sa+manual

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Not available online, but tantalizingly advertised by scam Russian sites.

https://www.google.com/search?q=vitamaster+treadmill+8733+manual

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https://www.sportsrec.com/374116-instructions-on-a-vitamaster-exercise-bike.html

https://content.abt.com/documents/65011/PFEX13813_manual.pdf

answer might be found in one of these downloads (documents)
New updated files for vitamaster triple action airwaves ii
19.February,2015

sounds like the belt is loose.there are bolts at the back on either side that tighten or loosen the belt.adjust with belt running about 3mph. tighten both bolts about 1/4 turn each while watching the belt to make sure it is centered. give it about 15 seconds after you tighten to see the adjustment that u make.the walking belt should only be able to lift up a little bit like 1 inch. you shouldn't be able to get ur hand all the way under belt (not running of course).

If the walking belt slips when walked on, first remove the key and UNPLUG THE POWER CORD. Using the hex key, turn both rear roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each edge of the walking belt 2 to 3 in. (5 to 7 cm) off the walking platform. Be careful to keep the walking belt centered. Then, plug in the power cord, insert the key, and carefully walk on the treadmill for a few minutes. Repeat until the walking belt is properly tightened.

If the walking belt slips when walked on. Using the allen wrench, turn both rear roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each side of the walking belt 3 to 4 inches off the walking platform. Be careful to keep the walking belt centered. Carefully walk on the treadmill for a few minutes. Repeat until the walking belt is properly tightened.

If the walking belt is off-center, remove the key and UNPLUG THE POWER CORD. If the walking belt has shifted to the left, use the hex key to turn the left idler roller bolt clockwise 1/2 of a turn; if the walking belt has shifted to the right, turn the left idler roller bolt counterclockwise 1/2 of a turn. Be careful not to overtighten the walking belt. Plug in the power cord, insert the key, and run the treadmill for a few minutes. Repeat until the walking belt is centered

ultrafitness equipment.com we got belts cheep 4 every make and model

I own this particular Old Fashioned bike -lol - its a hardy one thou and I dont think you can find the original book but the book that came with it came from the company Roadmaster Corp. which is now named Roadmaster Industries, Inc - 250 Spring Street NW - Atlanta, Georgia 30303 -- phone number -- (404) 586-9000. I hope this helps ya. My resource came from the website that tells all about the cpy.
http://www.fundinguniverse.com/company-histories/Roadmaster-Industries-Inc-Company-History.html

So good luck in finding your manual. I am pretty sure that they can help after all they made this bike originally in 1992,