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Old 04-12-2021, 05:52 PM
Erwin Haban Erwin Haban is offline
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Default Used 5 hours 1991 Millermatic 35

30 years back I purchased new a Millermatic 35 setup for hobby and maintenance work. It has totaled maybe five hours of arc time tops, probably far less. Life got busy and at work, my time between two plants consumed me. When I.needed anything it became easier to just have the Fab shop or Tool Room make or repair it for me. I just retired so I have to get a bit more self sufficient. What should I do to my like-new 30 year old unit to freshen it up or run maintenance on it? I like it and want to keep it for occasional needs. Thanks in advance.
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Old 04-12-2021, 07:30 PM
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GWIZ GWIZ is offline
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Welcome to the site.

If the gas lines run into the machine and out the back I would take the cover off and take "pictures of everything" then check the gas lines if they have crystallized I would replace them.
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Old 04-12-2021, 07:32 PM
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milomilo milomilo is offline
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Good machine for 1/4 - 5/16 steel. I'd fire it up and see how it runs. If good then just use it.
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Old 04-12-2021, 09:54 PM
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Wouldn't hurt to blow the dust and cobwebs out of it while you have the covers off. A corrosion free spool of wire and you're good to go.
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Old 04-12-2021, 10:52 PM
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Pull the cover(s) and take a peek inside. If the welder was stored outside, there may be corrosion and/or critter damage that needs to be addressed. Stored inside it should be OK but may be cockroach poops that need to be cleaned up. Inspect the connections for the volt lugs make sure they're clean. Wire and feed rollers may be rusty and have to be replaced. Post up some pics...
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Old 04-13-2021, 12:39 AM
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Quote:
Originally Posted by mccutter View Post
Pull the cover(s) and take a peek inside. If the welder was stored outside, there may be corrosion and/or critter damage that needs to be addressed. Stored inside it should be OK but may be cockroach poops that need to be cleaned up. Inspect the connections for the volt lugs make sure they're clean. Wire and feed rollers may be rusty and have to be replaced. Post up some pics...

Also tight
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Old 04-13-2021, 01:10 AM
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Quote:
Originally Posted by milomilo View Post
...Good machine for 1/4 - 5/16 steel...
Back in the day I welded lots of 1/2" and 3/4" plate with our old Millermatic 35. Multi-pass welds in most cases but it got the job done handily...
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Old 04-13-2021, 07:49 AM
Erwin Haban Erwin Haban is offline
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Thankyou everyone. The unit was stored in my unheated garage so part of just being prudent was pulling the covers. I wiped everything down and brushed all the wiring with a paintbrush. I'll blow it out next. The only corrosion seen was the spool of wire. All the major electrical connections are dull and tarnished but no sign of corrosion. What about the open relay contacts, the Capacitor bank and the gun/whip liner? I'll naturally throw out the wire. The rollers look good. What about the 25 year old tank of 75/25, still full but am I correct that it would still be good?
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Old 04-13-2021, 07:58 AM
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Quote:
Originally Posted by Erwin Haban View Post
T................... What about the 25 year old tank of 75/25, still full but am I correct that it would still be good?
I am definitely no expert but I bought a bottle of 75/25 in 2000 or 2001 expecting to setup a mig welder and a lot of things happened that prevented it. I just finished that bottle last summer and it seemed ok.
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Old 04-13-2021, 09:28 AM
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Use a new spool of wire and see if it feeds smoothly. If not, a new liner is in order.
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