Is your Lincoln SA-200 not running a grinder?

The image on the left is the front of a Sa-200 welder with a DC exciter.

 It is a two-KW DC generator (it's a generator because it has two brushes).

 The design goes back to the late 1930s. It is simple and very reliable.

           What to Focus on First

 1. Remove the dust cover, clean out any debris. Does anything look loose or burnt?

  2. Check the brushes; they should be at least 1/4" long and have a smooth wear pattern, no chips or scratches.

 3. Brush problems:

      Do the brushes emit sparks, and is the communicator covered

      in carbon dust? If so, this is evidence of a shorted DC armature.

3. Armature problems: The most straightforward way to verify a defective armature is to swap it out for a known-good one (RPM does not matter). We are just testing.

4. Suppose the replacement armature runs a grinder (you can also check the output with a 100-watt incandescent (old-fashioned) light bulb; nice, bright light = good!). The other way to test the armature is to remove it and take it to a business that can "growled".

        There is a machine called a "growler" in our shop; we use my father's 1949 unit. If there is a short, it will find it. Look for a motor repair shop or someone who still rebuilds engine electrical starters. It just takes a minute; we don't even charge for the service.

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1. The problem is that Lincoln has obsoleted this part, as well as many others. They want you to scrap the machine and buy one of their latest wiz-bang, welders with a built-in computer!

2. We here at Weldmart offer a five-year warranty on rewound armatures. If we are out of stock, we can rewind yours. If you suspect a defective armature, please don't hesitate to contact our office. We need to talk to you.

3. . 1-281-432-0250, phone is answered 24 hours a day, 365 days a year!

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Lincoln exciter coils; L 8707

If your exciter coils are the same as the ones

in the image, you have Lincoln OEM L8707 exciter coils. The only thing to keep in mind is that they will fail at the worst possible time. In our business, this is the one item we always strive to keep in stock. The original OEM coils are made of aluminum, with a parallel copper coil. No covering for weather protection.

1. If you read a few volts or no voltage, you have found your problem.

2. Pull the right-hand brush out and let it hang. With an ohmmeter,

   measure the resistance between the right brush and the left brush.

3. You should have a continuity of approximately 160 ohms,

4. If you get no reading or a very high resistance, replace them.

5. When purchasing your coils, we recommend obtaining a

   written warranty and always pay with a card and clip the

   receipt to the warranty.

1. Our L8707 coils are warranted for 10 years; when we install

   them in-house, the warranty is a lifetime. We have never had a

   warranty claim in thirty-seven years of sales.

Lincoln DC Exciter coils

$695.00

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