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  1. #1
    Veteran Member Steve_Miller's Avatar
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    Mar 2004
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    1,251
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    Nova Scotia, Canada
    Tractor
    2006 Kioti CK30HST

    Default CK30 Preheater controller

    Anyone know what exactly the preheater controller does? Does it control another relay that actually powers the glow plugs for a predetermined time? Having trouble with this circuit, I have no glow plugs at the moment (starting with my heatgun shoved in the air intake). I've tapped (aggressively) on the controller box and it fired the glow plugs and started once but haven't got it to do that again. Glow plugs are fine, light on dash comes on like it is timing. I'm out of warranty so I'm trying to troubleshoot on my own. I have the copy of the service manual that someone provided online here a year or to back but it is not exactly the same layout on the firewall as mine. Any help would be greatly appreciated.

    Thanks
    Steve

  2. #2
    Veteran Member SSdoxie's Avatar
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    Jun 2010
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    2,170
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    Cumberland Plateau, TN
    Tractor
    Bobcat CT225

    Default Re: CK30 Preheater controller

    This is how it works on the Bobcat verison. I presume it is the same.
    The preheat controller is a timer. It sends a signal, which passes through a fuse, to activate the glow plug relay. The output from the relay sends voltage to the glow plugs but also lights the indicator light in the dash. If the glow plug indicator light is coming on the relay is working.
    Dennis

    CT225 w/7TL QA FEL, 60"tooth dirt bucket, 68" smooth bucket, Pallet Forks, Bale Spear. Hydrualic top llin, QH, 48 RC, 60" tiller, Angle blade, Landscape rake, Carry-all, Post hole auger.

  3. #3
    Elite Member
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    Feb 2002
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    3,937
    Location
    western,pa.
    Tractor
    Kioti DK 35

    Default Re: CK30 Preheater controller

    Quote Originally Posted by SSdoxie View Post
    If the glow plug indicator light is coming on the relay is working.
    Mine didn't.
    The glow indicator plug light would come on in the dash of my DK 35, but I had no power to the glow plugs.
    My preheat controler was bad. I replaced it with a new one and its been fine ever since.
    Vince,
    Kioti DK 35
    Hustler Super Z

  4. #4
    Veteran Member SSdoxie's Avatar
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    Cumberland Plateau, TN
    Tractor
    Bobcat CT225

    Default Re: CK30 Preheater controller

    Quote Originally Posted by DK35vince View Post
    Mine didn't.
    The glow indicator plug light would come on in the dash of my DK 35, but I had no power to the glow plugs.
    My preheat controler was bad. I replaced it with a new one and its been fine ever since.
    I know Bobcat had quite a few design changes made in the electrical system, this must be another one of those. The Bobcat feeds the indicator light after the relay.
    Dennis

    CT225 w/7TL QA FEL, 60"tooth dirt bucket, 68" smooth bucket, Pallet Forks, Bale Spear. Hydrualic top llin, QH, 48 RC, 60" tiller, Angle blade, Landscape rake, Carry-all, Post hole auger.

  5. #5
    Veteran Member Steve_Miller's Avatar
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    Nova Scotia, Canada
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    2006 Kioti CK30HST

    Default Re: CK30 Preheater controller

    Thanks guys

    Steve

  6. #6
    Veteran Member Steve_Miller's Avatar
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    Nova Scotia, Canada
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    2006 Kioti CK30HST

    Default Re: CK30 Preheater controller

    My glow plug relay is bad, i can tap on it and it will work for a time or two then stop working again. It energizes but does not make contact closure to the plugs. My preheat controller controls the glow plug relay. If the coolant sensor in the engine block is above 30 degrees (Celsius) the glow plug relay and light will not come on. If the temp is below that they both energize (two separate outputs from the controller).

    Steve

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