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  1. #1
    Join Date
    Apr 2009
    Location
    A State of Confusion
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    143

    Post Another Miller Big 40 ?

    Hi all I was reading on another post on a Big 40

    But did not want to chime in on that post with a question of my own

    I just bought a used Big 40 my self and I bought it with its problems
    It does not produce an arc or generate any power I was told by one of the local repair shops that it needed to have the brushes and armature cleaned, the gentleman I bought it from told me it was welding when it was stored and set up for 3-4 years it looks like a well used machine but also stored in side as well but I guess thatís nether here nor there
    I was looking for the owners manual here by using the search and serial number but does not come up with anything I did notice that in small print under the sn# it said replacement name plate.

    I was wondering if anyone can tell me what steps I need to do in order to get a manual and parts list in order to be able to go through it and repair it also any leads on where I can find parts for such an old machine.

    Thanks in advance
    AKA CrazyHorse!

  2. #2
    Join Date
    Oct 2007
    Posts
    2,949

    Default Owner's Manual

    You can still download an owner's manual without the serial number. Try to find one on the machine, though, and it would be more specific.

    What year, or how old is your Big 40? What engine, gas or diesel?

    Dave
    "Bonne journe'e mes amis"

  3. #3
    Join Date
    Apr 2009
    Location
    A State of Confusion
    Posts
    143

    Default Big 40

    It's a 1971 with gas engine.

  4. #4

    Default

    It's very possible it does need the slip rings dressed with an armature stone and field flashed again.
    When the machine sits for so long, it can lose it's residual magnetism on the rotor. This is needed to start the generation of power.
    Flashing the field can be done with a 12 volt battery on the 2 exciter rings of the armature. Make sure you get the polarity correct.

    Here's a link to the manual
    http://www.millerwelds.com/om/o450n_mil.pdf

    Wire 5 and 6 on the exciter rings. Wire 5 is the POSITIVE.

    Hope this helps.
    Andy

  5. #5
    Join Date
    Apr 2009
    Location
    A State of Confusion
    Posts
    143

    Default Big 40

    thanks for all your help guys i will have to order the printed copy for miller
    my i-net provider really eats turd being i only have dialup and it just won't cut the mustard cant even down load a simpel manual because it is so
    slow and always a problem but what do you do cant afford the 1000 $ set up for my area for high speed let alone a 100$ a month for their service

    but thank you for your kind help.

    CrazyHorse!

  6. #6
    Join Date
    Apr 2009
    Location
    A State of Confusion
    Posts
    143

    Default Thanks Andy

    Quote Originally Posted by ASKANDY View Post
    It's very possible it does need the slip rings dressed with an armature stone and field flashed again.
    When the machine sits for so long, it can lose it's residual magnetism on the rotor. This is needed to start the generation of power.
    Flashing the field can be done with a 12 volt battery on the 2 exciter rings of the armature. Make sure you get the polarity correct.

    Here's a link to the manual
    http://www.millerwelds.com/om/o450n_mil.pdf

    Wire 5 and 6 on the exciter rings. Wire 5 is the POSITIVE.

    Hope this helps.
    Andy
    Thank you Andy the info provided was an enormous help my miller big 40 is up and running / welding great. Now i've got to find me a trailer to lug the big ole thing around with. LOL!

    Thanks Again!

    CH

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