Join Date: Dec 2018
Location: Fredericksburg, VA
Adjusting drive axle rpm for re-powering
Hi everyone, new member here, first post and question. I've spent several hours cruising the site and am impressed with all of the knowledge.
Looking at re-powering an Atlas A825TG (1989 vintage) blower that has a blown dual shaft TEC HM80. I've looked at can't find a decent one to replace it with so I'm leaning towards the Predator 301cc which of course is a single shaft.
If I'm using the pulley calculator correctly, the TEC is currently turning the auxiliary PTO at 1800RPM at the engine and delivers ~720RPM to the drive shaft which drives the Trac Drives (wheels). Small pulley diameter is 2", large is 5", center to center is 9".
The Auger set up will be fine with an engine swap.
What's the best way to lower the RPM for the Trac Drives (wheels) off of the new single shaft engine which is 3600RPM. Best I can figure is new pulleys but even using 6" and 3" my RPM to the drive would still be high at 1800RPM.
Oh, and the Atlas is a bit unique in that the friction disk switch lever (reverse to forward) is not centered as I've seen on others so I have already flipped the friction wheel and done some other mods to get it to work in the correct direction anticipating using a single shaft motor.
Maybe smaller pulleys on the auger, larger on the wheels and then governor down the engine. Or a combination of both. The track drives have internal gears and are chain driven, maybe doing some mods there could help also.
Appreciate any advice, I have not bought the engine yet, just have killed some time doing the other work while on vacation.
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