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  1. #1

    Default Deere 4200 Fuel selinoid fills with oil

    When my John Deere 4200 had about 100 hours it wouldn't start because (I eventually discovered) the fuel solenoid had filled with engine oil and that pressure stopped the piston from retracting. I replaced it with a new one (I was no longer under warranty because the first year I used it very little). About a month later the same thing happened, but this time I took it out and kept working the piston by hand to get as much oil out as possible,and it temporarily fixed it. Still, I have the same problem after a months use or when its parked on a slope. Can someone point me to a (hopefully easy) fix to this problem?

  2. #2
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
    Posts
    4,458
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: Deere 4200 Fuel selinoid fills with oil

    First, welcome to TBN, JIMMY.

    The engine oil inside the FI pump is used to lubricate it, as I am sure you
    know. There must be a failed internal seal that keeps oil from filling up the
    solenoid.

    This is one of the few parts of my 4300 I have NOT taken apart.

    Good luck, and report back on your fix.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  3. #3
    Silver Member
    Join Date
    Jul 2008
    Posts
    127
    Location
    Kansas City
    Tractor
    JD 4400

    Default Re: Deere 4200 Fuel selinoid fills with oil

    I'' bet the dreaded thermistor strikes again. The fuel solinoid has two winding, pull in and hold. The thermistor located behind the fuse panel controls the pull in windings. Turn the ignition key on. If you don't hear the "clack" of the solinoid pulling in, touch a ground to the white wire at the solinoid with the key "on". This bypasses the thermistor. Don't leave the white wire grounded too long or you can overheat the pull in winding. Once the solinoid is pulled in you can start your tractor.

    If this test leads you to the thermistor it's an easy fix with a soldering iron and a short piece of shrink tubing and a new LVU10323 thermistor from JD. Remove the lower pedistal cover, the part with the fuse panel door. Unbolt the fuse panel and rotate it to expose the back side. The thermistor is connected to a black and white wire that should be long enough to allow you access to replace.

    There are two kinds of 4X00 owners, those who have replaced a thermistor and those who will. I replaced mine last month on our 4400 with 980 Hrs.

  4. #4
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
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    4,458
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: Deere 4200 Fuel selinoid fills with oil

    Quote Originally Posted by atschirner View Post
    I'' bet the dreaded thermistor strikes again.
    My 4300 is the earlier design, with no thermister. My service manual shows
    both old and new wiring diagrams, but describes only the later design
    that uses the dual coil. It says nothing about how the earlier coil setup
    (with no thermister) works.

    My tractor's coil looks like it has been replaced and the thermister has
    been added. Apparently that themister failing has caused lots of
    headaches, including replacing the coil when it was not the problem.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  5. #5
    Platinum Member
    Join Date
    Jun 2012
    Posts
    522
    Location
    East Tennessee
    Tractor
    John Deere 4200

    Default Re: Deere 4200 Fuel selinoid fills with oil

    Quote Originally Posted by dfkrug View Post
    My 4300 is the earlier design, with no thermister. My service manual shows
    both old and new wiring diagrams, but describes only the later design
    that uses the dual coil. It says nothing about how the earlier coil setup
    (with no thermister) works.
    .
    This explains why I couldn't,find the thermistor on my 4200.

  6. #6
    Platinum Member
    Join Date
    Jun 2012
    Posts
    522
    Location
    East Tennessee
    Tractor
    John Deere 4200

    Default Re: Deere 4200 Fuel selinoid fills with oil

    Quote Originally Posted by dfkrug View Post
    My 4300 is the earlier design, with no thermister. My service manual shows
    both old and new wiring diagrams, but describes only the later design
    that uses the dual coil. It says nothing about how the earlier coil setup
    (with no thermister) works.
    .
    This explains why I couldn't,find the thermistor on my 4200.

  7. #7
    New Member
    Join Date
    Sep 2012
    Posts
    2
    Location
    Norphlet, AR.
    Tractor
    1962 TO-35 Massey Furgerson, 2000 John Deere 4300 HST

    Default Re: Deere 4200 Fuel selinoid fills with oil

    I had the same problem with my 4300, after buying 3 solenoids in a span of 2 years, I pulled the solenoid out and took my hacksaw and cut the plunger off, reinstalled solenoid . Starts every time ! when I get ready to kill motor, I idle it down, put it in high range and choke engine. remember to turn key off or you will run battery down.

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