Need belt for underwood 565 cr

These were in use before the days of the internet, so there will be no instructions.

https://www.google.com/search?q=Underwood+portable+electric+565.+I+can%27t+remove+the+platen

There are Service Manuals here if the typewriter has a model name rather than a numerical one?

https://site.xavier.edu/polt/typewriters/tw-manuals.html

https://www.google.com/search?q=underwood+565+service+manual+pdf

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That is a vintage unit. There is nothing specific to it, but there is some help for later models.

https://www.google.com/search?q=FISHER+MODEL+CR-W85+BELT+DIAGRAM

This is the closest.

Fisher CR-W855 /W856 /W857 Service Manual

AnalogAlley https://www.analogalley.com > osccart > product_info

Product: Service Manual. For Fisher Stereo Cassette Deck, models: CR-W856, CR-W857 and with included service manual supplement, CR-W855. Approximately 29 pages.
US$12.95

....

Please ask again along with the model number and any other branding such as Olivetti Underwood. The serial number provided is too long for original Underwoods. Model number is needed.

The wheel may be loose on its shaft look for and tighten the screws

Remove all covers, and platen, spray with regular solvent/Marvel Mystery oil mix 50/50, don't spray to hard or you could unseat tiny springs, try to focus on the internal parts and stay away from the motor too, then blow the excess out with air and let sit overnite to air dry the rest. If you have a yellowish drive belt in the unit, you should remove it also before spraying. Once all is dry, reassemble and test. Wipe the platen with a fast drying spray solvent that won't eat rubber like Trichlor 111 or equivalent, no lacquer thinner or products containing toluene, Contact Cleaners work, all keys should move freely, I cannot recall the drive mechanism for the keys however, generally speaking, rubber parts need to be clean and dry, no oil there, small mechanisms should move without binding, some people spray WD40 in typewriters thinking they will free it up, NOT! WD40 BAD!
The aforementioned wash should restore it back if someone WD40'd it for ya, have fun with that. :)

Belt shot

You van measure and order a 5% smaller belt from MCM Electronics OR just contact Marrs Belts and have his sell you the kit for the unit you have.
http://marrscommunications.com

I am not associated with Fred at Marrs but he does a good job of delivering the product.

You don't want to do that, use an automotive brake cleaner and spray in the rails while moving the carriage back and forth, that should loosen it up, dis-assembly would unleash the angry mechanical gods upon you, might want to keep the spray away from the motor and belt as they are apparently scarce, otherwise toss it and find an old gray Underwood in good condition and go

Belt is slipping or broken..When it sits for awhile the belt stretches.

I just replaced the belt on my Everstar VC-9550 and it works fine. I found it at Home Depot for $3.99. The belt is sold under Vac Belts item No. 51007 (Designed to fit Bissell Uprights, Style 7,9,10).