PTO snowblower running 1000 rpm?

[doxford jim]

Just the fact that the snow is getting blown out of the chute unbalances the fan. You've got a fan blade full of snow that is suddenly empty, meanwhile the one behind it is full of snow.

You actually have a constant changing load on the impeller as each blades loads up, moves and discharges the snow into the exit chute. The load changes are fast enough and probably balance each other out as the fan turns at speed.
Yes, care with balancing the fan does help a lot and probably goes a long way to making the blower virtually vibration free.

 

[pat32rf]

When I had my 20hp Bota I would run the blower at the high speed and vary my road speed with the hydro after setting the rpm at a speed that would blow snow.. Then I got my 40hp JD with single speed PTO. First I had to reduce the clearance on the fan blades, then smooth out the inside of the chute. Finally I just put a plow on the FEL....rather than run the engine wide open for a few inches of snow...