Google JOHN DEERe F525 Manual and it should be the first link. It is however not downloadable.
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You can try: http://www.deere.com/en_US/homeowners/services_support/manuals.html
Go to the Honda website and download the PDF. It is a scanned version of the original. The above answer is fine for the owner's manual, but does not cover the service manual. The service manual can be purchased from various sites online (I bought mine from PlanoPower.com).
The manual pto is the switch used to engage the mower deck.
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You can change a John Deere LA 175 mower deck belt configuration by checking the diagrams and instructions in the owner's or manufacturer's manual basically.
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Post an email and I will send you a PDF manual.
The only place I know of to get a new John Deere manual related to any of their mowers is through the local dealers. Although Ebay usually has some results.
To replace the bearings on a John Deer mower purchase replacement parts from a retailer such as Lowes or Home Depot. Then consult the instruction manual to learn how to disassemble the mower.
Try going to the related link, below, and click on the "manual" tab. Enter you model number and see if there is a manual for your mower. If there is you can print it or download it for free.
A John Deere belt diagram can be found in an owner manual. The manual should have all the diagrams, and other information for the tractor.