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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

jump starting with a DC welder

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Rob in Indiana

12-20-2007 16:25:30




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question for all you heavy equipment mechanics.

years ago when I started it was common practice to jump start equipment off our DC welders but as ECMs came into use our shop was told by several OEMs that doing so would damage or destroy the ECMs and the practice was stoped.

is anyone still jump starting with a DC welder and /or have you experienced problems with ECMs.

I see some unexplained failures every winter and my gut feeling is from jump starting with a welder.

thanks, Rob

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135 Fan

12-21-2007 00:29:56




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 Re: jump starting with a DC welder in reply to Rob in Indiana, 12-20-2007 16:25:30  
It's not a good idea but I've seen a Lincoln portable welder jump started with another one by putting the cables on the other welders welding cable lugs. The guy told me the welding generator works like a starter when the power is put to the terminals. I thought it was kind of neat. Dave



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Penn

12-21-2007 17:15:54




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 Re: jump starting with a DC welder in reply to 135 Fan, 12-21-2007 00:29:56  
Is that what happend to the Cat you had so much trouble with the charging?.
P



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NC Wayne

12-20-2007 17:47:17




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 Re: jump starting with a DC welder in reply to Rob in Indiana, 12-20-2007 16:25:30  
I haven't seen anyone do jump start with a welder in years. Nowdays I doubt that many of the guys running the machines would even have a clue how to do it, even on an older machine, without damaging something or killing themselves. Heck I've seen them burn up multiple starters, melt a wiring harness down, etc trying to install a radio on their own..... What I do know is that I have seen voltage spikes from other sources, (ie a bad voltage regulator) cause computer problems so I'd imagine a spike from starting with an improperly set welder would also cause problems...

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Lavoy

12-20-2007 19:55:17




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 Re: jump starting with a DC welder in reply to NC Wayne, 12-20-2007 17:47:17  
I think most welders are in the 20-30 volt OCV range, so I would also think that is probably adequate to really smoke an ECM.
Lavoy



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135 Fan

12-21-2007 12:06:24




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 Re: jump starting with a DC welder in reply to Lavoy, 12-20-2007 19:55:17  
Most welders have 70 to 80 open circuit volts. Once welding the voltage drops to around 24 volts. Dave



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Rob in Indiana

12-20-2007 17:55:34




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 Re: jump starting with a DC welder in reply to NC Wayne, 12-20-2007 17:47:17  
thanks Wayne.... I was hoping you see this and post you experiences.



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