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  1. #1
    New Member
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    Mar 2011
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    1
    Tractor
    Ford New Holland 2120

    Default Shuttle shift slips out of gears

    Have a New Holland 2120 with shuttle shift trans. Been slipping out of gear. Suspect turtle/rabbit switch and/or shuttle shift switch. Cleaned them out and appear to be working. Odd thing is, tractor engages and runs well for about 20 minutes, then starts slipping out of gear. Shutting engine off for a few minutes, then starting up again works, then moments later, slips out of gear again. Any thoughts?

  2. #2
    Administrator Muhammad's Avatar
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    Mar 1998
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    11,530
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    San Diego, CA
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    Default

    Welcome to TBN.
    Muhammad Chishti
    Administrator

  3. #3
    Super Member CompactTractorFan's Avatar
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    Jul 2010
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    7,959
    Location
    Pennsylvania
    Tractor
    Kubota BX25

    Default Re: Shuttle shift slips out of gears

    Welcome to TBN!!! Try the New Holland Owning/Operating section.
    Kyle - CompactTractorFan

    Kubota BX25 w/R4's (23 hp, 17.7 PTO hp), Loader, Backhoe, 60" Mid Mount Mower, Cyclone Rake Z-10 Lawn Vacuum, CountyLine Carryall, Ferris 48" Walk-Behind Mower, Honda 21" Walk-Behind Mower, Mighty Mac 4" Chipper/Shredder,
    2000 Dodge Intrepid, 2012 Ford F-150 EcoBoost

  4. #4
    New Member
    Join Date
    Aug 2011
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    3
    Tractor
    new holland 2120 4x4

    Default Re: Shuttle shift slips out of gears

    I am a new member of this forum on behalf of my father. I saw this older post and thought I would touch base to see if you have discovered a solution. We have a 99 New Holland 2120 4cl 4x4 low hours tractor with Hydrostatic drive. It has had one electrical problem while under warranty which was repaired. For some time we have had intermittent problems with the hydro transmission. It was worked on by a dealer ($1000) about two years ago but the problem has persisted and is getting worse. It now unpredictably will go into neutral in any speed, load, or terrain for as long as 5minutes and unpredictably slam into gear. It is dangerous and is not to be trusted in difficult circumstances.

  5. #5
    New Member
    Join Date
    Nov 2010
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    1
    Tractor
    New Holland TC21D

    Default Re: Shuttle shift slips out of gears

    I have the same exact problem on my 99 2120 the dealer replaced the shuttle shift switch cleaned all grounds. Still has the same problem $400.00 later.
    He suggested it might be the shuttle shift module $500 + labor but no guarantee. What did they do for your $1000.00 bill? Are there any soultions yet? It started slipping out 2yrs ago, happened twice in 12th gear transporting baler, last year 6 times any gear forward & reverse. The Last 2 month this year about every 20 minutes of operation all hydraulics work but 5 minutes later it will function again or sometimes jogging the loader valve it will go into gear.

  6. #6
    New Member
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    Aug 2011
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    3
    Tractor
    new holland 2120 4x4

    Default Re: Shuttle shift slips out of gears

    They just changed the oil and filters in the system--included a factory front loader and pickup and delivery. Now I suspect the pump but I am "gun shy" on my dealer.
    bd

  7. #7
    New Member
    Join Date
    Aug 2009
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    3
    Tractor
    NH 2120 hss

    Default Re: Shuttle shift slips out of gears

    I am having the same problem. I only lose forward, reverse works yet. I had the clutches out and they were fine. I am going to check for a voltage lose at the solenoid.

  8. #8
    Gold Member
    Join Date
    Jan 2012
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    385
    Location
    Winchester Ky
    Tractor
    Allis Chalmers ED 40

    Default Re: Shuttle shift slips out of gears

    I have a thought for any of you with this problem. I've never worked on a 2120, so I'm not familiar with its control system, but I have worked on many brands an styles of electrically controlled transmissions and shuttles. Try this: attach a volt meter to the fwd solenoid wire at the post on the coil. Sturdy enough connection so you can operate the tractor for a while and not lose connection. A meter won't affect the operation or confuse any controllers involved, but it will tell you what the system voltage is to the coil during normal operation. It will also tell you what that voltage is when your failure occurs, assuming you can get it to fail while still hooked up. When failure occurs, the volt meter will tell you if your problem is lack of signal(reduced or 0 voltage), or valve/clutch pack related(consistant voltage and no clutch engaged). If it's signal related and you're quick enough, you may be able to back track with the meter to determine where the signal disappears.

  9. #9
    New Member
    Join Date
    Aug 2009
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    3
    Tractor
    NH 2120 hss

    Default Re: Shuttle shift slips out of gears

    I found the problem yesterday. I put the volt meter on it and drove it. After abouyt 40 minutes it would act-up. the voltage would drop to 0 and the tractor stops. Further diag found the HSS module mounted upside down. It had a inch of water in it. I ordered a new module today.$425.00.....OUCH!!

  10. #10
    New Member
    Join Date
    Aug 2009
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    3
    Tractor
    NH 2120 hss

    Default Re: Shuttle shift slips out of gears

    DONE!!! FIXED!!!! The HSS module was mounted upside down. Water got in it. It was ruined. I replaced it at a cost of $437. It work perfect now.

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