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Dump Find. Tec H70 W/ Onan Generator.


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#1 IamSherwood OFFLINE  

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Posted March 24, 2013 - 06:45 AM

Last summer I spied this at the dump. After tightening /cleaning electrical

connections, it fired and ran.

Engine is a Tecumseh H70 130034A

Gen is an Onan 2.8TF  3P/1A        120/240V     2.85KW   3600 RPM

 

P1010701.JPG P1010702.JPG

 

My plan is to seperate the motor/gen, and spruce up the motor, and keep

it as a spare.

 

The generator, I'd like to rig up on a bracket, and have it available to hang

off the front of my MF12H.

 

My question is, will the generator work, if run in reverse rotation?

 


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#2 crittersf1 OFFLINE  

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Posted March 24, 2013 - 06:47 AM

I may be wrong but I don't think a generator cares which way it's turning.


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#3 Michiganmobileman OFFLINE  

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Posted March 24, 2013 - 06:51 AM

I know the alternator I put on the AG did not matter but I cant say for sure on that.  Nice FIND by the way, are you a frequent visitor to the dump?


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#4 IamSherwood OFFLINE  

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Posted March 24, 2013 - 06:58 AM

I know the alternator I put on the AG did not matter but I cant say for sure on that.  Nice FIND by the way, are you a frequent visitor to the dump?

 

Just like a bear, daily, but not by choice. I have to get rid of the garbage from

the business that way. Only in July and Aug.


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#5 Toolpartzman OFFLINE  

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Posted March 24, 2013 - 07:27 AM

Last summer I spied this at the dump. After tightening /cleaning electrical

connections, it fired and ran.

Engine is a Tecumseh H70 130034A

Gen is an Onan 2.8TF  3P/1A        120/240V     2.85KW   3600 RPM

 

attachicon.gifP1010701.JPGattachicon.gifP1010702.JPG

 

My plan is to seperate the motor/gen, and spruce up the motor, and keep

it as a spare.

 

The generator, I'd like to rig up on a bracket, and have it available to hang

off the front of my MF12H.

 

My question is, will the generator work, if run in reverse rotation?

  Huuummm, I'm not sure either Will, but that would be a slick application.  You could make coffee while out cutting firewood. :smilewink:



#6 KennyP ONLINE  

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Posted March 24, 2013 - 07:29 AM

Get satellite computer connection and you can take GTTalk with you about the yard!



#7 IamSherwood OFFLINE  

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Posted March 24, 2013 - 07:38 AM

I was thinking more along the lines of running my electric polesaw, while having

the chipper in tow.

But there sould still be enough power left, so I can have coffee, and surf, while

trimming the trees.


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#8 boyscout862 ONLINE  

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Posted March 24, 2013 - 07:40 AM

I think that you will find that the two separated parts will be useless. The PTO of the engine is probably tapered and the generator won't have an outboard bearing.. Just leave it together and enjoy your treasure. Good Luck, Rick 


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#9 ckjakline ONLINE  

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Posted March 24, 2013 - 07:49 AM

I guess you'll have to try it and let us know,because i'm not sure.You could always use an intermediate shaft and pulley set up and put the generator on the other way if it doesn't work.


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#10 IamSherwood OFFLINE  

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Posted March 24, 2013 - 07:52 AM

I think that you will find that the two separated parts will be useless. The PTO of the engine is probably tapered and the generator won't have an outboard bearing.. Just leave it together and enjoy your treasure. Good Luck, Rick 

 

The PTO question, was on my mind too.

We'll find out this afternoon..


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#11 DH1 OFFLINE  

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Posted March 24, 2013 - 07:55 AM

I don't think it matters which way the generator spins.

Your idea of mounting the generator on the front of the tractor to be driven by the tractor is great, make a useful portable power supply. :rocker2:

 

BUT using it to power a pole saw is not a good idea  :wallbanging: 

when it could be used to power a cooler for refreshments :D

Beer cooler, warm beer is N/G :beerchug:  :beer: :thumbs:  


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#12 boyscout862 ONLINE  

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Posted March 24, 2013 - 08:08 AM

If you want a small AC power supply with your tractor, HF sells power inverters for cheap.

http://www.harborfre...Power Inverters You can carry it along with any tractor and clamp it on to the battery with the engine running. Becareful, some charging systems don't produce enough power. See my Raven thread of yesterday too. http://gardentractor...actor-at-lowes/
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#13 Arti ONLINE  

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Posted March 24, 2013 - 08:19 AM

If you load the Generator heavy it will overheat, the  cooling fan isn't very efficient turning backward.

 

Also a gfi outlet would be a good idea. If anything shorts out Rubber tires are insulators and the Tractor can become a high voltage trap.  Just 2 cents worth.

 

Nice find on the generator, They were built heavy back in the day and the output was very steady current, I suspect the governors on the motors were set to respond quickly.


Edited by Arti, March 24, 2013 - 08:23 AM.

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#14 Moosetales OFFLINE  

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Posted March 24, 2013 - 08:21 AM

Just like a bear, daily, but not by choice. I have to get rid of the garbage from

the business that way. Only in July and Aug.

 

Just think of all the stuff you miss during the other months of the year!

 

Not sure if this applies so take it for what it's worth. I may be comparing apples and elephants here.

 

How Everything Works

http://www.secondcha...m/public/91.cfm

 

When the generator armature first begins to spin, there is a weak residual magnetic field in the iron pole shoes. As the armature spins, it begins to build voltage. Some of this voltage is impressed on the field windings through the generator regulator (commonly called the VOLTAGE REGULATOR, explained in the next article). This impressed voltage builds up a stronger winding current, increasing the strength of the magnetic field. The increased field produces more voltage in the armature. This, in turn, builds more current in the field windings, with a resultant higher armature voltage. This voltage could, of course, continue to increase indefinitely, but it is limited (by regulation) to a pre-set peak. At this point all this sounds like perpetual motion, doesn't it? Remember, though, that the energy driving all this is the engine's crankshaft!

 

Study the illustration and familiarize yourself with the generator's parts. It should be noted that the most common failure of a generator is the brushes. Second to that is bearing failure, especially the bearing next to the drive pulley (improper belt tension hastens the demise of this bearing!)

 

A major failure-mechanism in generators is improper installation of a new or rebuilt one. Mechanically, the installation is straightforward but electrically, things are more complex. When the generator stopped the last time, residual magnetism remained in the pole shoes. The polarity of the shoes at that time depended on the direction of current flow in the field coil windings. If - during testing and rebuilding - current is caused to flow in the opposite direction, the pole shoes will change polarity. If the generator is then run in the car, the reversed polarity will cause current to flow in the wrong direction, damaging the regulator and discharging the battery when the car is left overnight. Therefore, all generators must be polarized after installation and before running the car. This is done by holding one end of a wire on the "battery" terminal of the regulator and scratching the other end against the generator's output terminal (for externally-grounded generators). For internally-grounded generators the proper way to polarize is to disconnect the "field" lead from the regulator and scratch it on the "battery" terminal on the regulator.

 

And another:

 

http://physics.stack...osite-direction

 

Suppose if a windmill is made to rotate in clockwise direction and due to air flow if it rotates in anti clockwise direction then does it produce electricity?

 

This depends on the specifics of the design... One can certainly create generators that don't care which way they are rotated, and the simplest generator design (just a magnet and a coil) works either way. Although it might take energy out of the grid rather than add it. But I'd have to guess, based on no particular knowledge, that a real windmill would be very unhappy if you forced it to rotate the wrong way. – BebopButUnsteady


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#15 IamSherwood OFFLINE  

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Posted March 24, 2013 - 04:35 PM

I think that you will find that the two separated parts will be useless. The PTO of the engine is probably tapered and the generator won't have an outboard bearing.. Just leave it together and enjoy your treasure. Good Luck, Rick 

 

Correct. Tapered shaft, and no bearing in the gen.

Time to put on the thinking cap, and figure out a way

to make this work.


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