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Building a PTO Generator - Questions
I remember seeing OEM catalogues for computer stuff. Clone manufacturers would pick and choose the basic components to put together their particular boxes. I assume OEM catalogues also exist for mechanical components, and that's what a PTO generator manufacturer would use. Exactly the gearbox needed probably could be found. Of course, finding a catalogue and an OEM manufacturer that would deal with individuals is another question. It may be easier to think of the gearbox as matched to the generator rather than the tractor. If the peak load of the generator used doesn't require 16hp, than a smaller gearbox would work. A shear pin suitable for the gearbox could be used in the PTO shaft. What ever sized generator is used, I think that it's important to use a generator whose peak load rating (or the main circuit breaker rating) is not capable of lugging the engine. If the engine lugs, then the AC frequency falls off and there's a risk of burning out electric motors. If you're considering running the engine at something other than the PTO RPM, the exact ratio of a gearbox probably isn't too important. An rpm that produces 60 cycle AC could be found, however a good rpm would be near the max torque/hp point (the two points are close on many diesels). Many high-end PTO generators have frequency meters to help set the AC frequency. A trick I heard is to compare a clock with a sweep second hand that is plugged into the generator with a battery operated digital clock for a minute or so.
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Building a PTO Generator - Questions
The drives on 4" chippers I've seen are triple belts, so a belt drive could handle the HP. The risk of a belt drive is that it could start slipping, and slippage would lower the AC frequency. The engine on my Honda 6500, which is more realistically a 5,500 ‘watter’, is rated at 12HP, but I don't know how the hp is rated or how much gets to the generator. However, depending on the generator's duty cycle, 16 HP does sound a bit light for 9,500 W. Running a generator that is capable of lugging an engine really should be avoided. An alternative to a bigger tractor is a smaller main breaker on the generator.
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Building a PTO Generator - Questions
Duane: Perhaps I should keep my 'fingers shut' unless I've got something more than a vague idea to offer, but here goes. I wonder if somebody manufacturers a conversion gear box to use 1000 PTO implements on 540 PTO’s. There would be some loss of power going through more gears, but it might be easier than redoing the generator drive.
A 540 to 1000 conversion might work as well since gearboxes often can be turned around. If a specific product can’t be found, a generic box from an OEM catalogue might do the trick.
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