Miller Bobcat 250
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  1. #1
    Join Date
    Sep 2018
    Location
    Cut Off, Louisiana
    Posts
    9

    Miller Bobcat 250

    Hello everyone,
    I am new to this forum. Not sure where to start but here goes. I have a bobcat 250 LG052622. It will not start. I have replaced the vacuum pump and fuel filter to start with. Not sure where to go from here. I contacted miller for a service manual which they would not sell to me and referred me to a distributor and they would not sell me one either. Anyway if anyone knows how to troubleshoot this unit I would like some help. The unit was running fine after oil and filters were replaced along with the fuel filter. It started up and ran for about eight hours that same day but would not start up the very next morning. Thanks for any and all suggestions. Have a nice day. Did I mention I was not a welder just a dad trying to help his son. Thanks again for any assistance.

  2. #2
    Join Date
    Apr 2008
    Location
    NW ON Canada
    Posts
    3,101

    Re: Miller Bobcat 250

    Is it cranking over and just not firing?
    Jason
    Lincoln Idealarc 250 stick/tig
    Thermal Dynamics Cutmaster 52
    Miller Bobcat 250
    Torchmate CNC table
    Thermal Arc Hefty 2
    Ironworkers Local 720

  3. #3
    Join Date
    Mar 2018
    Location
    Stokes County, NC
    Posts
    143

    Re: Miller Bobcat 250

    You need the engine service manual which would come from the engine manufacturer or just hunt it down online. Find the troubleshooting guide and work your way down the list....

    What is the unit doing or not doing?
    Lance R


    Lincoln Ranger 10,000
    Smith Torch set

  4. #4
    Join Date
    Sep 2018
    Location
    Cut Off, Louisiana
    Posts
    9

    Re: Miller Bobcat 250

    Hello again, Thanks for the advice. I was able to solve the problem. I was checking all the wired connections and found the wire for the fuel shut off in front of carburetor under the air filter was broken. Wire was still in the connector like it should have been but when I pulled on it came off. Repaired it and then found positive on battery connection was cracked so I replaced it and the unit fired up and is running again.
    Thanks again for all your advice.

  5. #5
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    17,264

    Re: Miller Bobcat 250

    Glad to hear you found the problems right away and that they were easy fixes. Thanks for keeping us up to date.
    MM200 w/Spoolmatic 1
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  6. #6
    Join Date
    Aug 2015
    Posts
    10

    Re: Miller Bobcat 250

    Hello y’all I’m new and this is my first post. I bought a 2007 Miller Bobcat 250 with 2800 hrs on it for 500$. I put new heads on it polished the cylinder head all new fuel lines , fuel pump, air filter , spark plugs, gaskets, cleaned carb put new lifters , rocker arms, valves,pushrods, springs etc. when I turn the machine on it runs but runs full bore!!! The bad thing is I had to Fabricate my own exaughst and it’s loud needs tweaked. So when it’s running can’t really hear myself think. The bobcat will not idle down no matter if I switch it to run or idle run ?? What could this be and how do I go about fixing it ? Could it be the hour meter/ idle module , or the selonoid in back on top of motor. The machine has 3,000 hrs on it
    Last edited by Migwelder8825; 02-06-2019 at 09:06 AM.

  7. #7
    Join Date
    Sep 2005
    Location
    Cave Creek AZ
    Posts
    2,704

    Re: Miller Bobcat 250

    Put a longer up pipe on the exhaust to get it away from your head first. I have had problems with the idle board on my TB, I assume yours is similar. For starters push on the solenoid that makes it idle to make sure it works and is not simply stuck. Mine has forozen up before. Then disconnect the wireing atthe solenoid and use a volt meter to see if it gets viltage when trying to idle. Be aware it takes a minute of no use before it wants to go to idle. Also try jumping 12v directly to the solenoid. If it functions and you have a 12v signal from the board but it still doesnt work (thiswas what I had, not enough amps to pull it in) then use the signal to operate a relay and use the relay to work the magnet. If you get no signal at all then you need a new board, or to just get used to it running all the time.

    Oh, also, just start your own new threads instead of tagging onto old threads.

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