Chim,
The only video I have is the converted 3pth one, linked above. The hydraulic source is a homemade hydro power pack. I'm pretty sure I posted pics of the power pack before and will see if I can find them. It is an oddball build though because I had a hydraulic pump that I got an auction and wanted to use that instead of buying a typical PTO pump, like those available at Princess Auto or Surplus Center. Using a PTO pump would have been much easier and less complex.
Gordon,
I don't know how much PTO hp it takes to run one. My Massey 1547 had 38 PTO hp and it wasn't an issue. The blower would bog down due to lack of torque but the tractor never skipped a beat. I can't recall the hp that was produced by the hydro pack but think it was in the order of 20 hp maybe less. The pressure was only 2200 psi and that is why there was not enough torque, in my opinion. I believe that is the reason I had to go so slow but I could be wrong, since I never installed a pressure gauge to monitor the pressure in the feed line to see if it was going into relief. The hyd flow is variable with my setup and I would run it at around 16 to 18 gpm and that would spin the motor at 600 rpm, which produced a much further throw.
metalbender,
The hoses were only hung under the tractor with ropes and tie wraps, since I remove the hoses when not using the blower. I am considering making hard lines to permanently mount to the tractor because I now have also built a front mount brush hog that is offset and that uses the hydro pack too. The control valves are all on the hydro pack.
I'll see if I can find my previous post and link it here.