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830 as in an old 2 cyl 830?you'll be able to do a lot more than you think, them thing have torque for daysMy family bought a mech PTO drive years ago, was used Primarily w a JD B, and now a model 40, 420 and similarI dont remember the brand off hand (its blue), but we've run more stuff through it than a normal person would. Been great. The only issue, if you can call it that, is splitting the machine every few years to send the knives out for sharpening. When it was new you could toss a 3" branch in the chipper chute, and it would pull it out of your hands self-feeding. Just have to clear out below the outfeed every 5 min or so (bottom discharge)Also, it uses a 3 rib v-belt and a pulley system, so if something jams, the belt will slip (and smoke) but to my knowledge in 15+ yrs, havent had to change itHopefully all this helps
The Australian made Bare Co. PTO shafts are quite nice in quality and ease of both installation and maintenance. They were carried by Washington Tractor a couple of years ago. I don’t know if you have a three-point quick hitch or not, but they sure are nice. http://www.bareco.com.au/files-pto2002-index
Odds are that the 830 has a continuous running pto clutch with a dry clutch disk. Would only be wet if equipped with an independent pto.