Try Northern tool, they have tractor PTO welder/generators in almost
every capacity that is likely to be useful for a home or small farm.
I'd guess 10Kw would be enough for MOST emergency needs, but if you
have long power outages and need to run a lot of equipment then you
might need more.
Thank you for the suggestion, which varies from my intent/desire in
that...... I have the diesel truck w/PTO, AND a cheap welder [in which
someone burnt up the motor] that I wish to adapt to... running from the
Now, I want to use the diesel engine not only to weld but also as an
emergency power source.
I don't wish to buy a welder to merely connect to the PTO. That'd be
In other words, I have all the pieces, I just need to properly connect
them with an eye on the dual usage.
Hope I'm now clearer in my intent. Sorry for my former inadequate
snipped-for-privacy@earthl> Try Northern tool, they have tractor PTO welder/generators in almost
Without some more details on the welder, we probably can't be specific.
But here are a couple of things that are likely to be in the way:
Welder/generators almost always run at either 1800 rpmor 3600 rpm. When
in use, you really have to maintain that speed. I'm not sure which PTO
you have, it's' not likely that the shaft speed will be that high. Even
running it straight off the crankshaft might be a problem, 1800 rpm is a
bit low for most engines (except the BIG disels), 3600 rpm will shake
them apart. All of a sudden you will be talking about a speed increase
belt or gear system, usually in the 1:3 range. The HP requirements will
likely want multiple 'V' belts or a big toothed belt.
The other thing you may hit is that many of these units have only 3
bearings for the engine and generator combined, 2 on the engine, the
generator shares one with the engine. When you try to use the generator
sperately you have to rig out a mounting plate with a suitable bearing.
Think about a piece of 1/2" aluminum plate that bolts to the case, a
large ball bearing set in a 4 bolt flange mount in the center. Then you
will need some sort of extention shaft with the proper taper to mate up
to it. If you want to pulley drive it, you will need another bearing on
the other side of the pulley.
You would probably be better off selling off the welder/generator to
someone who can just rebuild/repalce the engine.
Courtney Thomas wrote:
Thank you for your surmise. If you know of any information source for
connecting a diesel engine to a welder/generator, I'd appreciate hearing
To try offering a little more information....
1-the engine is a 335 Cummins [885 cu in] diesel, so 1800 rpm engine
speed is OK, 3600 is out
2-don't know PTO rpms but I don't assume it's near 1800, so maybe trying
to run off the engine crankshaft [pulley w/big belt] might be better. I
assume I can get sufficient info from Cummins to finally get to a
welder/generator shaft turning 1800 rpms
3-pardon my ignorance, but when using the generator separately and
assuming the diesel engine & welder/generator are already connected,
why is a "mounting plate w/bearing" needed...beyond the existing
welder/generator hookup ? Also, again assuming the welder is already
connected to the diesel engine, what is the described extension shaft
for ? Or is all this your description of how to connect the diesel
engine to the welder/generator ?
I already own the diesel engine and welder, so I can't imagine that
discarding them and buying a welder/generator unit could be more
sensible, but maybe I don't have enough knowledge, imagination, or
experience yet... :-)
For my farm tractors, I use a PTO generator to power a Lincoln buzzbox I
use in the field.
The generator has a gear box on it to step up the shaft speed for the
tractor's 540 rpm shaft. Without the gearbox, or a modification, thereof,
the shaft speed could be adapted to a truck's PTO.
Cheaper, yet, might be to connect one of the belt-driven models to the
Either, of these are readily available at numerous farm suppliers. They
also are fairly common in the used markets.
I know of one operation that uses the truck PTO to power a hydraulic pump
which in turn drives separate generator, aircompressor, welder, and pump
units, via hydraulic motors.-- Look for a used wet line kit.
Sorry, after rereading the posts, again, I misunderstood what you were
trying to do.
Go with the used wetline kit and a hydraulic motor to power the welder
Fabricate your own hydraulic drive based on the PTO rpms out of the
transmission. That info would be available from the transmission
manufacturer, not, Cummins.
If you are coming off the engine accessory drives, that rpm info could be
supplied from Cummins.
With all used parts, you could fabricate a, relatively, inexpensive drive.
One more time!
Re the 3 bearings issue: Take a look at this genset;
setup has 2 big bearings in the stock motor, **ONE** bearing in the
generator portion on the right side of the unit. If you pull off the
motor and toss it, the generator end has only one bearing. You need to
supply that support and bearing. The result is one with two bearings
your existing setup looks like the first one, you likely have some
bearing plate issues. If it looks like the second and hooks to the
exisitng engine with a coupling, you are in good shape. My lengthy
description of the bearing plates is what you would need to rig up a
single bearing unit.
Re the engine. I presume the 335 Cummins ( and the 885 cubes) means
around 335 HP. This is a huge engine, it translates to 250 kw. And it
certainly would be running at 1800 rpm as a stadnard operating range. If
the engine still has a tranny attached, the pto is likely to be much
slower than 1800. If it was a stationary engine, and the PTO comes
straight off the back of the engine, it's likely to be a straight though
design running at crank speed.
You still haven't said what the welder/generator looks like. But it sure
sounds like a major mismatch in size. Your diesel will pull a 20 kw
generator/ 400amp welder without even knowing it is hooked up. More than
likely you would be better off buying a new/used item that more closely
matches what you want to do. I see 75kw to 125kw used farm PTO units
that would be a good match for your prime mover for $1000 to $2000 Or
you could find a small 4 cylinder engine to retrofit to your welder.
Courtney Thomas wrote: