Looks like an Australian company... if its the same company who made yours, although your is probably somewhat older that the machines on the web page http://www.unimig.com.au/
By the label on back it's 40 amps at 16v to 160 amps at 22v.
You will probable find that you loosen the two outer nuts then undo the center nut and the feed roller with it's retainer washer (held by the two outer nuts) should pull off the shaft (may be stuck due to rust!) then you can continue to undo the two nuts and you should be able then to flip the roller for the other size wire groove (0.6 and 0.8 I would expect) Give roller a good clean with wire brush inc the groove and re fit to match the wire being used. Clean top roller with wet and dry paper (it's only a ball bearing race)
Bit like these in pics.
Note if that is that rusty then recon the liner will be full of rust. Shopping list should include a new liner !!
A good clean should work. If you have an electric drill with a wire wheel then that would do it. Note the top roller pressure arm (hooked into slot) should swing out of slot to allow lifting of top roller for wire loading, again the screw it pivots on may be rusted up so some WD on that should help. Once you have cleaned the rust of rollers INCLUDING grooves you could give them a very light coat/wipe with some WD but make sure you wipe most of it off to avoid slipping when feeding wire.
One of the pics is from my very old Clarke mig other from another member, machine ??
Think the CO / Ar switch may alter the output slightly to better match the gas being used ie straight CO2 or CO2+Ar mix but that is a guess as I can't recall seeing that on any other mig welders todate.
If you take the other side panel off can you post some pics of the feed motor and other guts of machine, ta
`I will do my best to get cover off might be a few days in doing so but intend restoring this welder also am I right in say it has spot weld timmer.
thanks
andy
I have the spot stitch ect on mine but don't bother using it.
You have lost me a bit on the "did not know these was on it would it affect line feed"
I am guessing the seller said "it has fault with feed" ? maybe saying, pull trigger and it will feed for a second or two then stop ! Note looking at the first pic it looks to be set on STITCH !
hi mike reason I ask about line feed being affected was my dad so called mate said it was not feeding the line right sorry if worded wrong.
thanks
andy