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  1. #1
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    Jun 2008
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    Default 790 clutch...harsh engagement

    I've had this tractor since new - 10 years now. Starting from a stop in 1 or 2 I can never get used to where it engages, causing a lurch. I use other tractors and usually can quickly get used to the quirks, but it's been 10 years with this one. The clutch engages near the top of the pedal travel. Anyone else have this happen?

  2. #2
    Super Member RobS's Avatar
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    Jun 2000
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    6,233
    Location
    SW Michigan
    Tractor
    John Deere 790

    Default Re: 790 clutch...harsh engagement

    You can adjust the engagement height. I broke a pedal return spring and used that opportunity to adjust but haven't liked it since. Seems it's a pain to get to. Somewhere under the LH floorboard.
    Rob
    ****************
    John Deere 790, 70 FEL, 7 BH, 513 cutter and other fun stuff

  3. #3
    Elite Member AKfish's Avatar
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    Oct 2004
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    4,986
    Location
    Kasilof, Alaska
    Tractor
    JD 5075M; JD 110 TLB; Ford Ferguson 9N: JD X300R

    Default Re: 790 clutch...harsh engagement

    Quote Originally Posted by greenie View Post
    I've had this tractor since new - 10 years now. Starting from a stop in 1 or 2 I can never get used to where it engages, causing a lurch. I use other tractors and usually can quickly get used to the quirks, but it's been 10 years with this one. The clutch engages near the top of the pedal travel. Anyone else have this happen?
    I had to adjust the clutch on my old JD 970, too. The clutch would engage at the top of the pedal travel and my foot (heel off of floorboard) would be in the air... grabbing all the time - real bad in low range.

    My wife and youngest son wouldn't drive it for fear of it "jumping" into something!

    After correcting for proper "free-play" it was much better. It wasn't more than a 10 minute job; as I recall. The owner's manual lays it out pretty well.

    AKfish
    "Most people want to live on top of the mountain, but all the happiness and growth occurs while you're climbing it."

  4. #4
    Veteran Member kebo's Avatar
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    May 2006
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    2,220
    Location
    Lexington, SC
    Tractor
    2001 John Deere 790 4x4, bar tires

    Default Re: 790 clutch...harsh engagement

    Quote Originally Posted by AKfish View Post
    I had to adjust the clutch on my old JD 970, too. The clutch would engage at the top of the pedal travel and my foot (heel off of floorboard) would be in the air... grabbing all the time - real bad in low range.

    My wife and youngest son wouldn't drive it for fear of it "jumping" into something!

    After correcting for proper "free-play" it was much better. It wasn't more than a 10 minute job; as I recall. The owner's manual lays it out pretty well.

    AKfish
    You know, I have this SAME issue with the 790 I bought last year! After a while I began thinking maybe the previous owner had worn the clutch out in it because it grabbed at the very top of the pedal travel. And yes, it's very easy to make it jump, no matter how hard you try not too. Thanks for the tip though, I will definitely check the adjustment on mine and see if I can move the point of engagement closer to the middle of the pedal travel.
    Keith
    Nothing could be finer than riding my JD790 in South Carolina!!

    2001 John Deere 790 4x4 with Model 70 FEL, 5ft International World Agritech bush hog, 5ft Wallberg BB, 5ft Frontier disc harrow, 5ft King Kutter II Rototiller, 5ft Cultipacker, 5ft Sitrex finish mower, Leinbach PHD with 9" & 12" augers, Leinbach middlebuster, Leinbach #11 Field Cultivator, boom pole, custom 3pt handi-hitch, clamp on bucket forks, Pat's Easy Change.

    Nothing runs like a Deere, or smells like a John....

  5. #5
    Silver Member
    Join Date
    May 2003
    Posts
    159
    Location
    Indiana
    Tractor
    Deere 3005

    Default Re: 790 clutch...harsh engagement

    Quote Originally Posted by AKfish View Post
    I had to adjust the clutch on my old JD 970, too. The clutch would engage at the top of the pedal travel and my foot (heel off of floorboard) would be in the air... grabbing all the time - real bad in low range.

    My wife and youngest son wouldn't drive it for fear of it "jumping" into something!

    After correcting for proper "free-play" it was much better. It wasn't more than a 10 minute job; as I recall. The owner's manual lays it out pretty well.

    AKfish
    Does making this adjustment change the point in the pedal travel where the PTO engages? I would hate to make it so the transmission and PTO engagement points are so close that it becomes trickier.

  6. #6
    Super Member RobS's Avatar
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    Jun 2000
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    6,233
    Location
    SW Michigan
    Tractor
    John Deere 790

    Default Re: 790 clutch...harsh engagement

    Good question Tom. As I think about it, I don't think it will affect it as you're only adjusting the free play in the pedal itself. What might happen if you over-adjust is the drive clutch won't fully disengage but you'd have to be pretty far off for that to happen.

    Just to be sure, I checked my parts manual and on the dual clutch model there is only one link from the pedal to the cross-shaft. The adjustment is in this link so there shouldn't be any issues with PTO vs. drive clutch engagement.
    Rob
    ****************
    John Deere 790, 70 FEL, 7 BH, 513 cutter and other fun stuff

  7. #7
    Member Gypsy Rose's Avatar
    Join Date
    Jan 2009
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    38
    Location
    Tunbridge, Vermont
    Tractor
    JD790

    Default Re: 790 clutch...harsh engagement

    From the shop manual:
    Attached Thumbnails Attached Thumbnails 790 clutch...harsh engagement-clutchadjustment.jpg  

  8. #8
    Super Member RobS's Avatar
    Join Date
    Jun 2000
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    6,233
    Location
    SW Michigan
    Tractor
    John Deere 790

    Default Re: 790 clutch...harsh engagement

    Is it just me, or does it seem like no one of us has all the various manuals, but between all of us we can handle about anything!

    Good pic Gypsy Rose...
    Rob
    ****************
    John Deere 790, 70 FEL, 7 BH, 513 cutter and other fun stuff

  9. #9
    New Member
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    Jun 2008
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    13

    Default Re: 790 clutch...harsh engagement

    The plastic shroud near the clutch (and surrounds the shifter) needs to be removed. The adjustment was pretty close so I tried moving the linkage road to the further position on the clutch arm. The clutch engagement is slightly more controllable with the linkage in the outer hole.
    The clutch adjustment is limited because as you move the engagement down lower on the pedal's travel, the PTO clutch never fully disengages.
    The adjustment (using the other position on the clutch lever) makes the tractor a little easier to start from a stop.

  10. #10
    Veteran Member kebo's Avatar
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    May 2006
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    2,220
    Location
    Lexington, SC
    Tractor
    2001 John Deere 790 4x4, bar tires

    Default Re: 790 clutch...harsh engagement

    greenie, just to be clear the outer hole you refer to is the one at the end (or top) of the lever?? Thanks....
    Keith
    Nothing could be finer than riding my JD790 in South Carolina!!

    2001 John Deere 790 4x4 with Model 70 FEL, 5ft International World Agritech bush hog, 5ft Wallberg BB, 5ft Frontier disc harrow, 5ft King Kutter II Rototiller, 5ft Cultipacker, 5ft Sitrex finish mower, Leinbach PHD with 9" & 12" augers, Leinbach middlebuster, Leinbach #11 Field Cultivator, boom pole, custom 3pt handi-hitch, clamp on bucket forks, Pat's Easy Change.

    Nothing runs like a Deere, or smells like a John....

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