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 09-05-1999, 00:00 Post: 7682
Jeff Bissantz



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 Generators for Compact Tractors

I have also been considering a 10kw belt drive generator. With your 18" and2.5" pulleys you will be turning the generator at 3888 rpm at 540 pto speed.This is ok if you don't want to run at pto speed, you won't have as much power. Also have you considered that small dia. pulleys do not transfer as much horsepower, even in a two belt configuration. I found a parts bookcalled Grainger, their also on the net, that has the set up that I've found to maybe work better than v-belts. They have flat 1.5" belts that are called "h"series belts. They have teeth just like a gear spaced .5" apart and you won't get any slippage.An 18.5" and a 2.85" pulley gives you exactly 3600 rpm at 540pto speed. Also this type of belt is good for up to 20hp. This total set up costs about $300. which includes pillow blocks gears and belt. I hope thishelps. I haven't ordered mine yet but I have done extensive studying on thissubject. If you've got yours completed let me know how it works. Thanks Jeff






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 10-26-1999, 00:00 Post: 9130
Walt Williamson



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 Generators for Compact Tractors

Have a small Kubota, and I was thinking about the same thing. My only question is: will the tractor engine respond to load changes as fast as a dedicated generator motor? When the well pump or the refrigerator kicks on, will it hold a steady RPM or will the thing slow down and give me 45HZ instead of 60?






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 10-26-1999, 00:00 Post: 9138
al



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 Generators for Compact Tractors

i have had a pto generator for about 8 months, i have a 19 pto hp tractor and a 25 kw generac generator trailor mounted. here are some of my observations:1. you get about 1 kw per 2pto hp.2 with my tractor if i set the frequency at 60.7hz, with an average load when the refrig., well pump come on line there does not seem to be too much freq. variation below 59.6hz. frequency variation seems to be a better way of regulating your motor speed than voltage. you definately can not rely on the pitch of the motor to regulate pto speed. if you generator does not have a freq. meter built in (mine does)then i would buy one. multimeters with freq. measuring are about 50 bucks.3. the generator ties up your tractor so you cant use it for snow plowing etc.4. you dont have to service a generator motor.5. i have had my 3hp air compressor plugged into the generator and with the no load setting of 60.7 hz ther is a initial startup dip in frequency to about 59hz. 6. greater than plus/minus 2% frequency variation from 60hz can damage motors, electronics, etc.good luckal






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 10-26-1999, 00:00 Post: 9139
al



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i was at central tractor last week cost of the 25 kw generator was 2900,they had a 40kw unit also .if you have any questions email megood luckal






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 10-27-1999, 00:00 Post: 9152
Walt



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 Generators for Compact Tractors

Thanks for the feedback. I think I'll give one a try. Its a small tractor (10 PTO HP) but it'll run the well pump!






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 01-26-2000, 00:00 Post: 12245
Jeff Bissantz



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Sinse my previous message I have finished my belt drive gen. My gen is a 10 kw belt drive unit that I am putting on a 17 pto hp diesel tractor. After extensive studying, I decided to go with the 2" wide "h" series timing belt set up. This is like a timing belt on a car only 2" wide and teeth spacing .5" apart. You need a 6.6 to 1 ratio to step up from 540 to 3600 rpm. So I decided to go with a 24 tooth and a 156 tooth pulley set. This gives me a 6.5 to 1 ratio which is close enough. The 24t and 156t gears are 3.82 and 24.8 inches in dia. The 2" belt turning a 24t gear at 3600 rpm can transmit 30 hp which gives me with plenty of leeway. I mounted the 156t gear between two pillow blocks using a 2" shaft which is connected to the pto. (All this is mounted on a 3x3x3/8 angle iron frame.) I was suprised at how easy my tractor turned the big pulley and the gen. It also acts as a big flywheel, as it weighs 75lbs. When I start somethig big like a 3.5 hp motor, the big pully helps to power thru the startup, not slowing the engine at all. I don't know if you would get that benifit with a gearbox drive unit. All on all, it was a fun project and the outcome was better than I expected. If I can help anyone, drop me a line.






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 01-27-2000, 00:00 Post: 12258
Steve in Buffalo NY



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Wow! Sounds like mission accomplished! Now your next assignment, should you choose to accept it, is to re-figure the pully sizes so you can run the tractor at a more comfortable RPM (like 1500) and get the same 3600RPM output. That way you don't need to run the engine so hard and still get 60 Hz. Just my $0.02. And if you or any of your associates are killed or captured the secretary will disavow any knowledge of you or your mission.






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 01-27-2000, 00:00 Post: 12270
MichaelSnyder

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 Generators-for-Compact-Tractors-

Humm, Are tractors made to produce max HP or torque at 540 pto RPMs? Just curious, because it would made sense to run the motor at its peak rating, rather than at 540 pto RPMs..Just a thought.






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 01-27-2000, 00:00 Post: 12280
Jeff Bissantz



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I own a Massey Ferguson 1020 tractor with a 21 hp diesel engine. It puts out 21 hp at 2550 rpm full throttle. Pto speed is 17 hp at 2150 engine rpm. Pto speed is usually at an rpm that is about 15% less than max engine hp or rpm. At pto speed you can run for long periods of time without the risk of damaging the engine while leaving you with extra power when needeed. I don't think pto speed is set at the highest torque of the engine. It's just set at an engine rpm that combines power and engine life.






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 01-27-2000, 00:00 Post: 12281
Bill



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Fellas, I built a very similar set up last fall for my tractor (10KW). But the minimum size that Grainger and Mc Master Carr recomended for me was almost 5 inches for the smaller gear. This was due to the HP transfered by the belt and pully, and speed at which it would run. I utilized the more costly metric timing belts and pullies. They have a rounded tooth, that makes less noise and wears much longer. My tractor grunts when I have the stove burners on, the oven on, the spetic airator running, the fridge runing, the furnace running and the well pump starts(already loaded pretty heavy, in other words, as I wanted to see what would happen), but looses only about 50 RPM. I have access to a digital tack, not the frequency meter. She belches black smoke but doesn't miss a beat. Mike, it all depends on the torque curve, which is different from machine to machine, but you would think that the PTO speed would be the optimum speed for HP/torque mix(if the engine was tuned with the machine in mind). Torque plays as big a part of power in a deisel, as does HP. Maybe more so. But most motors which are worth their salt have a pretty flat torque/hp curve accross the rpm range, so it may not matter to much anyway. One big question I have is do those timing belts whine very loudly like I was told they would at those speeds? Mine is set up a little differently than the ones mentioned here. Bill






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