Hi boakley it doesn't say in your profile what tractor you have but quoting an RPM number alone isn't helpful. The engine rpm varies significantly between different size and model of tractors with respect to where the PTO is designed to operate at. On a BX tractor, this would be very low rpm.
no troubles and great point... its a Kubota L3301 pushing a Farm King 6610 (66") 3pt snowblower which has the high capacity 4 blade fan.
I used to blow snow with my smaller B2620 and a 60" Farm King blower and both seem to have about the same pto rated speed at about 2600 rpm if I remember right but would need to look at the speedo's to be sure.
2100 on both seems to work fine for where I am even though the B2620 seems a little small for the 60" blower.
Snow type also makes a difference with very wet needing more rpm than the drier/colder snow.
Lots of variable for sure like grade, temp's, type tractor, whether blower is under/oversized for tractor......
before the DPF I always seemed to want to run closer to lugging than WOT. Now everything I do is about 2100 rpm and getting about 27hrs between regens. A little more often in winter than summer of course but very happy with the L's DPF performance as crossing fingers been trouble free so far.
blowing snow is one of my fav. use for tractors