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Thread: Miller Bobcat 225g HELP

  1. #1
    Join Date
    Jul 2019
    Location
    Michigan
    Posts
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    Miller Bobcat 225g HELP

    Picked up a bobcat to repair now Iím stumped.
    Miller Bobcat 225g ser#kh312128

    Got this for a good price.
    Got it running had low voltage low weld output
    Got crazy replacing parts.
    New rheostat, original was broke.
    New sr2
    New D4, old tested bad
    New fuse holder, old look bad.
    New brushes and holders, old ones were stuck.
    Cleaned slip rings

    Was getting 90 volts at outlets
    Tested slip rings
    - continuity between slip rings, none between rings and shaft
    -3.7 ohms between slip rings
    Weld lugs in ac setting 1.7 volts
    Outlet 2.6 volts ac
    Was getting 9.5 Vdc at brushes, change battery now getting 35.8 mv
    Checked and cleaned plg4
    Continuity between d4 and engine coil?

    Can sr2 be wired wrong? Someone else was in machine before me.
    Any help would be appreciated
    Thanks.

  2. #2
    Join Date
    Sep 2019
    Location
    Forney, TX
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    Re: Miller Bobcat 225g HELP

    I have almost the same issue with my trailblazer 250g. I have ruled out everything that I can think of except the field current regulator board. I sent it out yesterday to MRO to get repaired. Iíll let you know if that works. I didnít see any visible damage to the board, but there arenít that many components in the machine. MROís turnaround time is about a week. Cost is estimated around $200.

  3. #3
    Join Date
    Jul 2019
    Location
    Michigan
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    Re: Miller Bobcat 225g HELP

    Thanks let me know. Had the rotor and stator tested and tested good. Just haven’t had time to get back on it. Let me know.

  4. #4
    Join Date
    Sep 2019
    Location
    Forney, TX
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    Re: Miller Bobcat 225g HELP

    I just realized I never followed up here...I sent the board to MRO and they said they repaired it. When I got it back, I compared it to pictures I took before hand and everything was the same. They said they replaced components, but didn't. I don't know if it was just a tech that lied, or if they thought it was repaired, but wasn't...I don't know. Either way I demanded a refund and got it. So, I'm still stuck, but haven't had time to mess with it. I'm going to pickup a Bobcat 225g that had a bad motor, so hopefully with the two I can make one work. Did you have any luck with yours?

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