Whenever I go into a clutch, I generally replace everything but the shaft and the plates, assuming they are in OK shape. If the tractor's been in regular use most of it's life, the pressure plates should be OK. If it sat outside for years, they may be rusted and need to be surfaced or replaced. Otherwise, spirol pins, throwout, teaser, spacer, shaft bushing, friction disk, all get replaced. I've always used stock parts. The stock clutch will spin tires with chains in dirt and dig a hole before the clutch slips. At least that's my experience. If it's a later model (like my 1000) there is also a flex disk at the reduction gear that needs to be addressed.
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