I bought a used rake recently to help get rid of the rocks on the property. I just noticed today that the holes on the bottom are a bit bigger than the holes at the top. I was told this is a CAT1 implement and so I didn't think I would need to purchase bushings. But maybe I'm wrong.
That setup is correct, larger pins on the bottom and a smaller pin on the top link, the bottom pins take the load when pulling and carrying, the top link is for levelling and to hold the implement when raised and travelling, so doesn't need to be a large pin.
You all might be saying the same thing. Pin should be sized to fit the implement hole. Pin should also be sized or a bushing installed to fit the lift arms. B.
So the OP bought a Cat1 linkage rake and has a Cat1 tractor, so if OP has Cat1 lower pins and his top link is Cat1, why would the OP need bushes??, if the OP has a Cat2 top link, then yeh!!, he will need bushes.
Same reason the cat 1 quick hitch attachment requires bushings as the holes are cat 2 size…some things ya just roll with and this is one of them things.
As shown in the attachments, hitch dimensions are standards that were created over 70 years ago. Pins in Post #13 are drawbar hitch pins, not 3 point pins. Any farm supply store will have the proper pin sizes in bins labeled for the hitch category. The standards were set for implement interchangeability and insuring pin sizes are capable of handling the tractor size. Bushings allow using implements for smaller tractors to be used on larger tractors but realize that by using bushings a person is using an implement intended for a smaller size tractor on a higher horsepower tractor.
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