Your mower appears that it may be for a "front-mount" mower unit.
If you go to https://partscatalog.deere.com/jdrc/ and type in "60" and look at some of the resulting front-mount (or other) mower decks you can probably figure out what you have.
Finishing mowers typically operate with a blade tip speed of around 17,000-19,000 feet per MINUTE.
To achieve the lower end of that range your spindle speed needs to be around 3100 RPM's IF my math is correct, DISCLAIMER: better double-check it and triple check it and rely on your own math!
The math:
21" bade diameter X 3.141592 pi X 3100 RPM's / 12 inches in a foot = 17043 feet per minute.
So if your tractor's belt pulley shaft that you are sourcing power from turns 1280 RPM's you need a speed INCREASE of at least 1 : 2.42 between the tractor and mower.
Also, for everyone's safety, GOOGLE "finishing mower blade tip speed" to verify that the 17,000 to 19,000 feet per MINUTE is correct.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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