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  1. #1
    New Member
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    Feb 2013
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    amelia va
    Tractor
    JD 4600

    Default JD 4600 injection pump

    After tractor runs at working temp for a while it will not restart after it is shut off. Problem is the fuel shut off solenoid on the end of injection pump fills with motor oil. The guy at the pump repair shop says that the oil level in the pump should not get high enough to get in the solenoid. Anybody seen this problem?

  2. #2
    Elite Member Tx Jim's Avatar
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    Jan 2007
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    4,834
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    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: JD 4600 injection pump

    Does oil in inj pump require changing similar to piston type inj pump on Ford tractors?? It's possible inj pump crankcase oil is getting contaminated with diesel fuel from one or more of the inj pump plungers that are leaking fuel

  3. #3
    New Member
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    amelia va
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    JD 4600

    Default Re: JD 4600 injection pump

    No sir, Oil is supplied from crankcase as continious flow.

  4. #4
    Elite Member Tx Jim's Avatar
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    North Texas
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    JD 4255/Kubota M7040 HDC

    Default Re: JD 4600 injection pump

    Quote Originally Posted by mflippin View Post
    No sir, Oil is supplied from crankcase as continious flow.
    Then it appears to me that what ever valve/orifice that is intended to maintain correct inj pump lube oil capacity is malfunctioning.

  5. #5
    Member
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    Jan 2013
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    Location
    plainfield ct
    Tractor
    850 jd

    Default Re: JD 4600 injection pump

    Oil getting to this solenoid is not a problem, it is very common. The problem is the thermistor. Solder in a new one and problem is gone. On the ten series JD did away with thermistor because of this problem and went with a plug in fuel solenoid relay in fuse box.

  6. #6
    New Member
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    Feb 2013
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    amelia va
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    JD 4600

    Default Re: JD 4600 injection pump

    Thanks for the info but where is the thermistor?

  7. #7
    Platinum Member
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    Dec 2001
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    995
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    Maryland

    Default Re: JD 4600 injection pump

    The thermistor is located on the back side of the fuse box. Unbolt the fuse box and pull it out. It is soldered into the wiring. It is orange in color and looks like a Chicklet piece of gum.

  8. #8
    New Member
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    Feb 2013
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    amelia va
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    JD 4600

    Default Re: JD 4600 injection pump

    Thanks for the help!

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