Please help find the manual for this Roadmaster Vitamaster 9890 Treadmill

The battery compartment for the display on the Vitamaster 8711 treadmill is typically located on the underside of the display console. You may need to unscrew or unclip the console to access the battery compartment. Once you have access, insert the required batteries according to the polarity markings (usually indicated by a plus and minus sign). Make sure to replace the battery cover securely before reattaching the console. The specific battery type and number required for your treadmill's display should be listed in the user manual or on the console itself.

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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Question edited for clarity.
Question moved from Motorcycles category.

Unfortunately it is a vintage fitness bike and predates internet manuals. Some help in the links but not a lot in regards manuals.

https://www.google.com/search?q=Vitamaster+62C+manual

https://www.google.com/search?q=Vitamaster+62C

https://www.google.com/search?q=Vitamaster+exercise+bike+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

Go to this link, http://www.searspartsdirect.com/partsdirect/brands-products/Vitamaster-Parts/Treadmill-Parts

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

To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns.

Check Workout warehouse. Should be able to search them online.

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,