new to me PTO generator

   #1  

Car Doc

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This is the latest project- I bought a used Winco 25k 540 rpm PTO gen from a electrical contractor buddy. Actually we are trading work for it so it will be fairly easy on my pocket with most of my tickets being half labor roughly. :thumbsup:

Its functional and the trailer tires hold air and so far only needed 1 u joint fixed and the 100 amp cord end re-done the wiring there was rotted and cracked so I just peeled 8" of insulation off to get to like new wiring to strip and connect.

The trailer has way to much tongue weight its not much fun to hook up as is. Looks like I can move the gen back 10-12" and still have enough drive shaft so thats my plan. He plans on putting in a box out at the service entrance soon for me and I will be all set. :thumbsup:

(right now I can unplug one of the lifts and back feed the shop thru that pigtail I have the breakers that I really need on that leg in the box, I have a gas powered generator that wont run the whole shop now I plugged in that way)

I have been saying this on here for some time but my hope has been that once I got one I could run it in a higher PTO gear like 2nd or 3rd so I can run the engine at an idle or a bit higher to save fuel and be quieter and easier on the tractor.

For my first test I plugged my big mig into it and ran a long 250 amp bead and in 3rd PTO gear @ 1200 rpm. I could tell the welder and the tractor were not liking that so put it in 2nd at 2000 rpm and that worked perfect kept the voltage within the green so I kind of know the load and speeds will probably work like I hoped.

I highly doubt any load I could put on it other than the big welder will necessitate me running the tractor in 2nd gear but time will tell? My lifts are 24 amp surge roughly and 8-10 amps run so thats the biggest 220v loads I will see so I should be able to run the whole shop in 3rd gear @ 1200 rpm at least I have my hopes. :thumbsup:
 

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   #2  

winston1

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:drool::drool::drool::drool: I'm a mite bit jealous. Nice looking rig.
 
  
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#3  
OP
Car Doc

Car Doc

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Thanks winston every now and then a good deal comes along not often enough though!
 
   #4  

284 International

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Wow, I'm envious of your genset. That's really nice. And 25kW! I've got a 10kW head I've been puttering with in down time, getting ready to make a PTO generator.

I had planned on building mine on a 3-point "pallet" with space for fuel jugs, extension cords, and the like, but I almost am convinced a trailer would be better, just looking at your setup.
 
   #5  

California

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Envious here too! :)

Instead of moving the generator back and letting the driveshaft spline slide out farther - could you move the trailer axle forward?
 
   #6  

sacsr

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Car Doc,

Nice deal!! I have a pto driven alternator/generator setup....but only 5000.....

One thing I think I noticed in the picture is the angle on the shaft from the pto to the generator.....no expert.....but when I was starting out asking questions about mine......someone in the group made the comment the shaft needed to be as straight and level as possible.......may not be an issue ....but wanted to mention it.....I am sure others will chime in with better info.....

If you search the attachment threads you can see my 3pt pto and the trailer that was built for it....I am not particularly happy with how exposed the drive shaft is on mine and have been looking at possible ways to shield it.....I plan on making a cover to protect it from the environments.

Good luck! Look forward to see how you proceed with it.
 
   #7  

winston1

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Car Doc,

Nice deal!! I have a pto driven alternator/generator setup....but only 5000.....

One thing I think I noticed in the picture is the angle on the shaft from the pto to the generator.....no expert.....but when I was starting out asking questions about mine......someone in the group made the comment the shaft needed to be as straight and level as possible.......may not be an issue ....but wanted to mention it.....I am sure others will chime in with better info.....

If you search the attachment threads you can see my 3pt pto and the trailer that was built for it....I am not particularly happy with how exposed the drive shaft is on mine and have been looking at possible ways to shield it.....I plan on making a cover to protect it from the environments.

Good luck! Look forward to see how you proceed with it.

Sacsr, I tried finding your thread, guess I need help. Wanted to look at your generator.
 
  
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#8  
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Car Doc

Car Doc

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Envious here too! :)

Instead of moving the generator back and letting the driveshaft spline slide out farther - could you move the trailer axle forward?

I thought about that too and at this point I'm not sure? Time will tell but yeah thats an idea thanks California! :thumbsup: (actually even pondered counter weight at rear to save effort like a pipe bumper....)

I haven't looked under it to see for sure but it looks like its welded solid from on top? I will post back once I do something.

This was a farm welded project (looks like it anyway) its not terrible bad but its crude and functional like it needs to be and not pretty. :laughing:
 
  
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#9  
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Car Doc

Car Doc

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Car Doc,

Nice deal!! I have a pto driven alternator/generator setup....but only 5000.....

One thing I think I noticed in the picture is the angle on the shaft from the pto to the generator.....no expert.....but when I was starting out asking questions about mine......someone in the group made the comment the shaft needed to be as straight and level as possible.......may not be an issue ....but wanted to mention it.....I am sure others will chime in with better info.....

If you search the attachment threads you can see my 3pt pto and the trailer that was built for it....I am not particularly happy with how exposed the drive shaft is on mine and have been looking at possible ways to shield it.....I plan on making a cover to protect it from the environments.

Good luck! Look forward to see how you proceed with it.

Thanks Scott,

You have a point the drive shaft angle is a concern in that the height of the 3 pt can interfere if raised up too high. I noticed that when I unhitched it so if I go over a large enough dip on the property I will have to keep it in mind for sure!

Since you were told something I will add this-Actually technically speaking u-joints need to run at a slight angle in order for the needle bearings to rotate to lube and spread the load in the joint.

Now with that said I believe 1.5 to 5 degrees is the target angle but as long as there is some the joint can do what its designed to do. :thumbsup:
 
  
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#10  
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Car Doc

Car Doc

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Wow, I'm envious of your genset. That's really nice. And 25kW! I've got a 10kW head I've been puttering with in down time, getting ready to make a PTO generator.

I had planned on building mine on a 3-point "pallet" with space for fuel jugs, extension cords, and the like, but I almost am convinced a trailer would be better, just looking at your setup.

Thanks 284,

Did you notice I used a draw bar to hook into the clevis pin hitch on the trailer?

I did this because it was handy I was in a hurry and I wanted to move the gen from the shed into the shop and after I did it I realized it makes perfect sense once I stepped back and looked at it and I dont plan on changing that. :thumbsup:

Here is why-I can pull it with a pickup using the clevis and pin setup or I can put the draw bar on for the tractor with a hitch pin. Rather than making a permanent 3pt attachment on it somehow this way I dont have to do anything and it really pulls and backs up nice being back that far etc! :thumbsup:

One other thing that I/we all can do now with a PTO gen is weld fences and gates and stuff out and about our property or anywhere just throw on the cracker box and go. I for one used to have to call someone with a portable welder to do work like that now I can just dream something up and get after it no planning or working around someone else's schedule. ;)
 
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California

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[axle] looks like its welded solid from on top?

This was a farm welded project (looks like it anyway) its not terrible bad but its crude and functional like it needs to be and not pretty. :laughing:
I've never posted a photo of my farm welds... :D

I have a couple more thoughts. First, if that trailer is clumsy to move around and the driveshaft angle is too extreme, what about putting the generator on a little Harbor Freight 40x48 trailer. (under $200). At 125 lbs empty, those are as easy to move around as a garden cart. I like mine so well that I just bought another (used, $30) to mount a watering tank on. These seem like the perfect size to mount things on.

Second, is there a need to brace that trailer against the pto's torque? I see strange fittings on the front of your trailer and wonder if those were for torque-resisting feet. Maybe a calculation of ft-lbs would reveal if there is enough torque to lift the trailer.
 
  
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Car Doc

Car Doc

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I've never posted a photo of my farm welds... :D

I have a couple more thoughts. First, if that trailer is clumsy to move around and the driveshaft angle is too extreme, what about putting the generator on a little Harbor Freight 40x48 trailer. (under $200). At 125 lbs empty, those are as easy to move around as a garden cart. I like mine so well that I just bought another (used, $30) to mount a watering tank on. These seem like the perfect size to mount things on.

Second, is there a need to brace that trailer against the pto's torque? I see strange fittings on the front of your trailer and wonder if those were for torque-resisting feet. Maybe a calculation of ft-lbs would reveal if there is enough torque to lift the trailer.

If I do need a stick welder for something I will post some of mine...a person gets spoiled once they go to mig. :)

I think the drive shaft angle is actually almost ideal on a flat surface when its set right with the draft control and my ground is pretty level, its a lot better than my mower for instance.

A new trailer may not be necessary I am trying to make this as much a no-work project as I can but that is a good idea if I do need one! :D :laughing:

I dont know what the welded on elbow on the corner etc is anybody's guess there haha. This thing could have come out of the oil field originally for all I know that could have been for a vice stand etc but the piece of pipe on the left side of the tongue was their attempt at a tongue stand.

It had a nut welded on (1/2 broken loose now) that had (I assume) a bolt to be tightened on a shaft with a pad welded on the bottom for a foot. Its laying on the front there, just a solid shaft with a piece of a blade of some kind welded as a pad I didn't reuse it. :confused2:

I built a simple pipe with a foot and put it in there with a long bolt and nut and a couple extra holes to hold it up out of the way so I dont need any wrenches to use the tongue stand doing it my way now.

As far as the reactive torque...never once crossed my mind to tell the truth. I am not an engineer but my gut tells me this setup is real heavy and I dont doubt if it locked up there could be trouble but as is and just making juice I doubt it will do much reacting but time will tell thats an interesting thought?
 

284 International

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I did see that design. I like it; if you set the trailer stand up correctly, you could make it so the stand held the trailer a little lower than transport position, then you could back the drawbar up, raise/lower for alignment, back up, then pin it. No strained backs or anything like that. Alternatively, I mounted one of these onto a small utility trailer. It's nice because once the trailer is on the ball, the pin comes out and everything rotates out of the way quickly. Consequently, one doesn't need to spin the jack endlessly to gain clearance.

It looks like the trailer would be well balanced if it had a welder mounted at the rear. I wonder if that was the original design.

I'm still mulling my options for mine. It's not going to be even half the size of yours, but a wheeled apparatus still has some appeal. I may even end up with a combination of things, with castered tires on one end but a three point apparatus as well.
 
  
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Car Doc

Car Doc

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284,

Thanks for the ideas! Here is a pic of my super simple tongue stand there is a hole down low under the cross brace that the bolt goes in once the tractor has the weight off that keeps the stand off the ground and I dont have to man handle it.

Now with that said the fact the stand is up in the arc of the drive shaft on turns as long as its attached I do need to be mindful of it being up on that one side when turning left no biggie though for now.

(there is a pic of how the axle is welded to the frame also its not going to be impossible to relocate it just have to flip the whole trailer over on its back if I decide to spend the time we will see about that...)

A swing away jack would be real nice and I will probably do it later even thought about going to town for one this time but with the amount of time I allowed myself I went the short cut route. :D

edit: I had this post printed and my alignment shop guy showed up with a customers car so I had to post this quick and take him back to town so sorry thats why the pics didn't show up till now.
 

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