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Bobcat s150 kubota. Idling high.

Discussion in 'Skid Steers' started by Txhayseed, Jun 10, 2020.

  1. Txhayseed

    Txhayseed Well-Known Member

    Joined:
    Dec 23, 2019
    Messages:
    183
    Location:
    Texas
    Hello guys. Got a bobcat s150 with the Kubota with the v2403. I just rebuilt the motor and got in reinstalled. Had to have in bored over size due to cylinder wall damage. Im idling high. Around 1500 rpms. Touching the set screw. Does anyone have a service manual or know how to adjust the idle speed ? I reused the same shim thickness that i removed on tear down to reinstall the injection pump. Info on the tier 4 v2403 is hard to find. Any info or experience is appreciated
     
  2. thepumpguysc

    thepumpguysc Senior Member

    Joined:
    Mar 18, 2010
    Messages:
    5,640
    Occupation:
    Master Inj.Pump rebuilder
    Location:
    Sunny South Carolina
    Cant u turn the screw out to adjust the low idle.??
     
  3. Txhayseed

    Txhayseed Well-Known Member

    Joined:
    Dec 23, 2019
    Messages:
    183
    Location:
    Texas
    I can yes. Im assuming that since i had it completely tore down i could have introduced minor changes in the timing and alignment of the timing marks on the gear train. The only manual i can find is for a non bobcat applications. The timing window for the bobcat is different since bobcat utilizes there own bell housing and flywheel ?? I can defiantly cut the factory wire out and change the screw but im kinda perplexed on what i could have changed to account for the rpm increase at idle. My max rpm with the throttle wide open is almost spot on with engine removal. So if someone can correct me if im wrong changing the pump timing would only affect my full throttle rpm and not my idle speed ??
     
  4. thepumpguysc

    thepumpguysc Senior Member

    Joined:
    Mar 18, 2010
    Messages:
    5,640
    Occupation:
    Master Inj.Pump rebuilder
    Location:
    Sunny South Carolina
    What parts were changed & why.??
    I wouldn’t worry 1 bit about it as long as u don’t have to back the screw out to the last thread, if u know what I mean..
    A 1/2 to 1 turn is expected after an engine “re-fresh”..
    Don’t get to hung up on the timing if u checked it already..
    Did u move the max fueling screw.?
    Does this engine have an electric shut off solenoid screwed into the side of the pump mount.? If yes, unscrew it a few turns to see if that’s interfering..
    But like I said, it’s expected..
    If u changed a major component, a head, block, cam... then u would have to reset the timing.. If u had the gears out of place, it would be extremely hard to start & run like crap.. if it started at all.
     
    Vetech63 likes this.