NO AUXILLARY POWER

Lincoln OEM coils, P/N L8707. In my experience, if these coils are in your machine. They are either bad or going bad. Cheap aluminum wire, no protection from the elements, just paint. They are now obsolete from Lincoln Electric.

Weldmart L8707, all copper, sealed windings, epoxy coated—10-year warranty Made in America. When we install them in our shop, we warranty them for life. In over 30 years no failures.

YOUR EXCITER ARMATURE NEEDS REPLACING: WHAT NOW?

The facts of life and Lincoln DC exciter armatures. Lincoln exciter armatures are available in

various RPMs.They are 1,400, 1,450, 1,500, 1,600, and 1,800 RPM. If you are not sure of the machines

RPM, give us your code number. Lincoln has obsoleted these armatures, but we can rewind yours and

give you a 2-year warranty. These units have to be hand-wound and soldered; very few shops rewind

them anymore. The process includes the following steps:

The armature core is inspected for damage.
The original wires are removed and separated from the commutator
The core is baked in an oven overnight at 600°F. This removes the original varnish.
The original wires are removed, and their diameter is checked against the new windings

to be reinstalled

Core is sandblasted and clear-coated with insulation.
Insulating strips are cut and installed in the slots.
New windings are wound by hand.
New holding wedges are installed to hold the windings in place.
Wires are soldered.
The commutator is machined to make sure the brushes have perfectly flat contact.
Rotor is dipped in high temperature insulation and is submerged in a slowly

rotating fixture, to assure through penetration of the liquid.

8. Baked to solidify insulation.

9. The armature is "high-pot" tested for insulation breakdown.

Not a day goes by that I don't get a frantic phone call; I was welding along, and the arc died!

The engine runs excellently, but there is no weld. I did this and that, but nothing works!

Here is where to start.

Remove the exciter nose cone.
The system is simple; it consists of a DC armature that spins between two field coils.
Usually, the problem is one or the other.
Check the exciter brushes; pull them out. They should show even wear across their face.
Length is not that important as long as there is enough that the brush spring ho
it against the commutator.
Using a DC voltmeter, check the voltage at the brush leads. Clean the bolts to ensure
a clean service.
The right brush is positive, and the left brush is negative. At weld speed, you should
have approximately
110 volts DC across the brushes.
If you read a few volts or no voltage, you have found your problem.
Pull the right-hand brush out and let it hang. With an ohmmeter, measure the resistance
between the right brush and the left brush. You should have a continuity of
approximately xx ohms,
If you get no reading or a very high resistance, time replace them.
When purchasing your coils, we recommend obtaining a written warranty.
Our L8707 coils are warranted for 10 years; when we install them in-house,
the warranty is a lifetime. Always pay with a card and clip the receipt to the warranty.
Your coils appear to be serviceable, except for the armature.
How do you test your exciter armature? The most certain way is to have the armature "growled".
Call around and find an electric motor repair shop or a shop that rebuilds starters;
they should have a growler machine. I have my Father's 1950's machine. It takes less than a minute.
If it is bad, you need a rewind; Lincoln has obsoleted this part.
Rewinding these armatures is labor-intensive, as it must be done by hand.

MORE INFORMATION

You want to order an armature. Here is what you do. Please email or call our office. First, we need the code number from your machine. We need your core. If we have a replacement armature in stock, we can ship, but we need your core either way. If you call after hours or on a weekend, please leave a message. If, for some reason, you don't hear from us in ONE (1) business day, call back. Our phone numbers and email address are below.