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I have a Lincoln welder sa 250 d3.152 I was wanting to know which is the positive on exciter ring or brushholder front or back brush holder?

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Posted on Jan 02, 2017

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SOURCE: lincoln ranger 250 voltage problem

Check the current control resistor with an ohm meter. The center terminal should have a smooth rise or fall of resistance when measured to one end or the other of the resistor. If the resistor and the wiring to it are OK, check the shunt in the output it'll be by the "electrode" terminal. If both are OK you probably have a bad control board.


Posted on Feb 23, 2009

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The mig welder should be capable of welding aluminum not stainless but the makers should be able to give you more detail. mig is used for steel and aluminum normaly but I do not know this transformer

Posted on Apr 08, 2009

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SOURCE: what is the 250 class mig welder to buy the miller

I was warrenty repair shop for lincoln, esab ,miller, hobart,and clark for five years .my expereance with lincoln as far as customer sevice they dropped the ball alot,miller on the other hand had great cusomer service.My opinion the miller family is the way to go for dependability,parts,and service.

Posted on Jul 12, 2009

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SOURCE: How do you ignite a Lincoln Electric Welder???

You don't need an striker with a MIG welder just hook the ground cable to the base metal point the nozzle where you want to weld and pull the trigger and it will weld. Household current will run a MIG welder Take a look at the plug on the welder if it will pug into a 110v outlet you are all set, but most likely you will need a 220v outlet and maybe as much as an electric dryer type outlet. 

It takes a lot of practice to be a decent welder you also need to know what voltage and wire speed settings to use for a given thickness and type of material. 

You don't mention shielding gas, if you are using a flux core wire you don't need it, but if you are using regular wire you do. 

If I may make a suggestion, If you really want to learn how to weld, find a community college near you and take an introductory welding class. You will get a wealth of information and practice on different welding processes. The instructor will work with you and get you welding much better and faster than you will on your own. Most importantly you will get a lot of safety information.

This is a good introductory book:

Posted on Mar 04, 2010

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SOURCE: sp-200 lincoln welder

Go to the following link:

Posted on Dec 14, 2010

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Put a 9 volt battery across the slip rings of the exciter for a moment to "Flash" the exciter. If the first attempt does not work, reverse the polarity of the 9 volt battery. It only takes a few seconds. This creates the initial magnetic field that makes it work.

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clean the brush rings with a very fine emery cloth is still then there is a controller board issue at that point it will have to go to a service center do to there are no supplier's for them other that Lincoln go to their sit HERE and find a service center in your area these boards range from $250.00 to $600.00 there is 4 of them in the machine they will have to remove the top and swap the boards till they find the right one have the same welder i have been through this with Lincoln already hope this helps

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No power to weld or use A/c power outlets

You don't say what model welder you have, some Miller welders have 3 slip rings and brushes some have just 2. In either case the next step is to use an ohm meter to check the resistance of the rotor and brush assembly. If this is a 2 slip ring model, take one of the wires off of one of the brushes then measure the resistance between the 2 brush terminals - it should be something between 10 and 100 ohms. If you get an open circuit measure the resistance from one slip ring to the other right at the slip rings - if you now get something other than an open you've got bad brushes (about $10 each to replace),

The 3 slip ring models are similar but have 2 rotor windings - take off the wire from the middle brush and measure from it to each of the ends.

If your rotor and brushes checked out OK you should next check the fuse in the exciter circuit, this will be on the block where the other end of the brush wires go.

If the fuse was good you need to do an excitation test. This is a bit dangerous so be careful. Look at the schematic pasted inside the case and figure out which brush is the positive (+) one. The wires are numbered and so is the schematic so this isn't as hard as it might seem.
Disconnect the wires from both brushes (all 4 wires in the 3 slip ring model) and tape them off so you won't get shocked. Get a 9V battery or make up jumpers that will let you connect the welder battery to the brushes. Start the welder and connect your temporary power supply, measure the AC at the outlets (it should be around 60VAC with a 9V battery) and the DC voltage at the weld terminals (should be above 10V), lastly measure the voltage at the wires you disconnected from the brushes (should be around 70V DC). Disconnect the temporary power supply and shut down the welder.
If you didn't get AC at the outlets and DC at the weld terminals above, something is wrong with the stator in your welder. If you didn't measure any DC on the wires that go to the brushes (most likely thing to happen), you've got something wrong in the exciter circuit. Check the rectifier, the capacitor, the exciter winding in the stator, and lastly the current control board. Older welders will also have the fine current control rheostat in this circuit (look for burned windings on it).

That's about all of the general advice I can give you without knowing more about which welder you have.


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