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  1. #1
    New Member
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    Feb 2013
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    Foster,R.I.
    Tractor
    john deere 770 70 fel 7 bh

    Default Shifting on a J.D. 770

    Good evening all, My name is Rob and this is my first thread on your forum. I just picked up a '92 770 compact tlb. It runs and operates quite well, and would say it is in good overall condition, however I am finding myself grinding the gears. I am typically doing this going from 1st to reverse in high range, all though I also find it happening shifting into other gears. It doesn't do it all the time, I just cant seem to find a sweet spot. Do I need a clutch?
    Thanks in advance.

  2. #2
    Silver Member SHORT KID's Avatar
    Join Date
    Feb 2010
    Posts
    159
    Location
    Poconos, PA
    Tractor
    Mahindra 2615 hst fel, bh

    Default Re: Shifting on a J.D. 770

    Your clutch may just need adjustment. Next time you are operating, make sure you are fully depressed on the clutch and completely stopped before shifting.You may even apply the brakes to make sure you are completely stopped. Good Luck

  3. #3
    New Member
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    Jan 2013
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    24
    Location
    North Milton, Prince Edward Island, Canada
    Tractor
    John Deere 650, 2008 Ram 1500

    Default Re: Shifting on a J.D. 770

    I have a 650. If i am running the pto it takes a second after i depress the clutch for the pto to slow down

  4. #4
    New Member
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    Feb 2013
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    22
    Location
    Foster,R.I.
    Tractor
    john deere 770 70 fel 7 bh

    Default Re: Shifting on a J.D. 770

    Thank you for your replies. I'll get out there today and make sure I am completely stopped. Hopefully that helps.
    Last edited by robmc; 02-10-2013 at 09:32 AM.

  5. #5
    Elite Member Don87's Avatar
    Join Date
    May 2010
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    4,226
    Location
    SW Pa.
    Tractor
    Massey Ferguson GC2400

    Default Re: Shifting on a J.D. 770

    I saw a post somewhere one time, where the person said that 'double-clutching' would stop the gear grinding when shifting up thru the gears. It has an unsychronized transmission(kinda like a tractor-trailer).
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  6. #6
    Silver Member droptop's Avatar
    Join Date
    Jan 2012
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    198
    Location
    Western NY
    Tractor
    Massey Ferguson 1635 cab

    Default Re: Shifting on a J.D. 770

    Shifting a 770 on the fly is tough and takes a lot of practice and still isn't 100%. Best to stop and shift until you are more comfortable and experienced with it.

  7. #7
    Elite Member Chilly807's Avatar
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    Sep 2009
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    3,214
    Location
    Nova Scotia
    Tractor
    Kubota L3400DT

    Default Re: Shifting on a J.D. 770

    Any unsynchronized trans will grind if you shift on the fly without double clutching, mine is the worst when I go to engage any gear from neutral. I find it helps if I press the clutch in, wait 5 seconds, then engage a gear. That allows the transmission shafts to come to a stop and no grinding will occur.

    The trouble with double clutching a tractor is you have very little momentum to carry you while you shift, I usually only shift on the fly between 3 high and 4 high.

    Sean

  8. #8
    New Member
    Join Date
    Feb 2013
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    22
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    Foster,R.I.
    Tractor
    john deere 770 70 fel 7 bh

    Default Re: Shifting on a J.D. 770

    Thanks again to all of you for your feedback. I was able to get on the tractor today and I did what you folks recommended. It was considerably better. You have to wait a few seconds before you engage. I really have to send that clutch home however. Is that normal? (There is consistent pressure through the whole stroke of the pedal.)

  9. #9
    Silver Member SHORT KID's Avatar
    Join Date
    Feb 2010
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    159
    Location
    Poconos, PA
    Tractor
    Mahindra 2615 hst fel, bh

    Default Re: Shifting on a J.D. 770

    One other thing I forgot to mention in my earlier post, after you are done shifting take your foot completely off the clutch pedal.You probably already knew this but if you are busy and doing a lot of back and forth, one tends to forget. I had some problems with seat adjustment on mine because of my short legs.

  10. #10
    Elite Member
    Join Date
    Dec 2002
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    2,740
    Location
    Foster, RI
    Tractor
    Mahindra 3016

    Default Re: Shifting on a J.D. 770

    Quote Originally Posted by robmc View Post
    Thanks again to all of you for your feedback. I was able to get on the tractor today and I did what you folks recommended. It was considerably better. You have to wait a few seconds before you engage. I really have to send that clutch home however. Is that normal? (There is consistent pressure through the whole stroke of the pedal.)
    Greetings fellow Fosterite. I would heed the earlier suggestion from Short Kid and take up some of your clutch adjustment. If its anything like my 750, there should only be about a half to an inch of free play before it engages. If you are engaging too close to full pedal, then you need the adjustment. I am not sure which shifter you have but if its a synchronous, even if it allegedly is able to shift while moving, I'd still come to a stand still if I'm grinding gears. Check the clutch travel at any rate.

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