Help Lincoln MIG welder problem

I have a Lincoln SP-170 MIG and recently I started having trouble with it.
It does not seem to weld as it used to. It does not seem steady, it almost
feels as though the wire speed is too fast and the wire wants to bounce and
push the gun but when you turn down the speed it start dropping blobs. It
used to weld excellent. Is there any electronic thing inside that may have
malfunctioned and would cause these symptoms. I checked all connections,
even inside the machine, the ground is good, gas is good, work is clean and
wire is new and clean. Drive wheel, tension , liner, tips etc good. I am
using 100% CO2, 0.023" steel wire. Thanks for any help.
Reply to
Loading thread data ...
Sounds like the main contactor or the control circuit is bad.
Lincoln machines aren't too expensive to fix, especially small ones like that.
Your local welding store should be able to get it fixed.
Reply to
Ernie Leimkuhler
Kinda sounds like a bad ground...
Reply to
Kevin Beitz
That is what I thought first but I used a grinder to clean the ground clamp and made sure all ground wire connection were clean and tight, even back inside the machine. The ground clamp itself was getting warm but not hot. I always use a grinder on the work where the ground will be placed.
Reply to

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.