Lincoln wire-matic 255 feed/speed problem

Ignoramus22591

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Jan 13, 2014, 9:02:19 AM1/13/14

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We have a Lincoln wire-matic 255 mig welder. Lately it has developed a
problem, as follows: when the operator presses a trigger, it starts
feeding the wire way too slowly, for about a second, then it instantly
increases the speed to the proper speed and stays at that speed.

This happens every time and is very consistent. The proper speed
should be attained right away instead of a delay.

I tested the motor alone, it runs fine.

Any idea what may be wrong with it. I have my own ideas, but I do not
want to share them so as not to pre-judge anyone.

thanks

Gunner Asch

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Jan 13, 2014, 10:21:26 AM1/13/14

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Is the wire feeder slipping? If it is..you have a worn set of rollers
set too loose or a rubber link roller is getting hard or worn.

Generally the motors are connected to the actual feeder mechanism..and
are not direct drive.

Gunner

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Gunner Asch

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Jan 13, 2014, 10:34:13 AM1/13/14

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On Mon, 13 Jan 2014 07:21:26 -0800, Gunner Asch <gunne...@gmail.com>
wrote:

>On Mon, 13 Jan 2014 08:02:19 -0600, Ignoramus22591
><ignoram...@NOSPAM.22591.invalid> wrote:
>
>>We have a Lincoln wire-matic 255 mig welder. Lately it has developed a
>>problem, as follows: when the operator presses a trigger, it starts
>>feeding the wire way too slowly, for about a second, then it instantly
>>increases the speed to the proper speed and stays at that speed.
>>
>>This happens every time and is very consistent. The proper speed
>>should be attained right away instead of a delay.
>>
>>I tested the motor alone, it runs fine.
>>
>>Any idea what may be wrong with it. I have my own ideas, but I do not
>>want to share them so as not to pre-judge anyone.
>>
>>thanks
>
>Is the wire feeder slipping? If it is..you have a worn set of rollers
>set too loose or a rubber link roller is getting hard or worn.
>
>Generally the motors are connected to the actual feeder mechanism..and
>are not direct drive.
>
>Gunner

Oh...your liner can be dirty as hell also and it can cause this.

Pull the liner and shoot WD down the liner and see how much spooge
comes out the far end

Ignoramus22591

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Jan 13, 2014, 10:34:06 AM1/13/14

to

On 2014-01-13, Gunner Asch <gunne...@gmail.com> wrote:
> On Mon, 13 Jan 2014 08:02:19 -0600, Ignoramus22591
><ignoram...@NOSPAM.22591.invalid> wrote:
>
>>We have a Lincoln wire-matic 255 mig welder. Lately it has developed a
>>problem, as follows: when the operator presses a trigger, it starts
>>feeding the wire way too slowly, for about a second, then it instantly
>>increases the speed to the proper speed and stays at that speed.
>>
>>This happens every time and is very consistent. The proper speed
>>should be attained right away instead of a delay.
>>
>>I tested the motor alone, it runs fine.
>>
>>Any idea what may be wrong with it. I have my own ideas, but I do not
>>want to share them so as not to pre-judge anyone.
>>
>>thanks
>
> Is the wire feeder slipping? If it is..you have a worn set of rollers
> set too loose or a rubber link roller is getting hard or worn.

It is not slipping. It was a board problem.

I had a junk wire-matic 255 (similar model but not identical to this
250).

I took a board out of it, which looked similar enough, replaced the
board, and now our welder runs great again.

i

Haroldharley1962

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Oct 3, 2022, 5:03:45 PM10/3/22

to

Turn the welder off hold the trigger on turn the wire speed clear full all the way then to power up it will beep three times that will be fast start instead of slow start

--
For full context, visit https://www.polytechforum.com/welding/lincoln-wire-matic-255-feed-speed-problem-52609-.htm