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Welding Shop

Hobart GR303


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  #1  
Old 07-28-2012, 11:12:13 PM
Varmint1 Varmint1 is offline
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Default Hobart GR303

New to the forum and have questions on a Hobart GR303. Just got this thing yesterday and got it fired up today, don't know how long it has sat up. I'm new to this kind of welders so just bare with me, anyway when I first got it started it wasn't making ac or dc, checked brushed cleaned slip rings still nothing. I started looking at the ac gen and started running the wires and found the flash board and checked the fuse (ok) checked all the wires and fired it back up and I had ac power but still no dc, getting batt voltage at cranking to center brush, is my voltage board bad and if so can I get a new one or can I have it rebuilt. Thanks Patrick
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Old 07-29-2012, 11:07:41 PM
Varmint1 Varmint1 is offline
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Default Re: Gr 303

Today I checked the voltage control board and found corrosion on the terminals, also found on a transistor ( or whatever it is) had a broken lead, resoldered and cleans terminals, installed board. I checked output on the negative and positive lugs and getting max 40 volts and when I turn the fine adjustment it does get lower is this correct, but when I turn the rough adjustment nothing changes, please help!
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Old 07-29-2012, 11:52:47 PM
Jim Tremble Jim Tremble is online now
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Default Re: Gr 303

Patrick

On the slip rings, there is a unit that looks like a rectifier. Take it off and toss it in the trash. It was installed to make clean power to the outlets. If that goes bad, you will not get power or very little power.

Try that and post back what you find.

Jim
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Old 07-30-2012, 10:18:00 AM
Varmint1 Varmint1 is offline
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Default Re: Gr 303

Where are those rectifiers located at, you wouldn't happen to have a wiring schamatic for this machine and thanks for the reply
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Old 07-30-2012, 10:41:30 AM
Jim Tremble Jim Tremble is online now
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Default Re: Gr 303

Quote:
Originally Posted by Varmint1 View Post
Where are those rectifiers located at, you wouldn't happen to have a wiring schamatic for this machine and thanks for the reply
Patrick

Go to this thread. You will find info for your problem and the man to contact.

http://www.smokstak.com/forum/showthread.php?t=85909

Mike is very helpful and you can get a wiring diagram from him.

Jim
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Old 07-30-2012, 11:03:53 AM
Varmint1 Varmint1 is offline
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Default Re: Gr 303

Thanks Jim
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Old 07-30-2012, 02:32:15 PM
Varmint1 Varmint1 is offline
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Default Re: Gr 303

Talked to Mike at c&m welding and he told me to check my input and output on voltage control board, everything was in specs, I told him about my main adjustment wheel just spinning and he told me it was broken on the inside and probly stuck between ranges. I removed wheel and found the two ears on the inner adjustment ring had broken off, so with a little rigging I got the ol' machine welding. Thanks again Jim for the info
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