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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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