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  1. #1
    New Member
    Join Date
    May 2011
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    7
    Location
    Central MS
    Tractor
    Ford 1900

    Default PTO disengaging while in use

    My 1900 pto is disengaging while I bushhog. This problem started a few months ago and only happened once or twice during the time it took to cut 3 acres. Finally, last week the problem progressed to where my boot being lodged on the lever would not even keep it engaged. The previous time cutting my boot being lodged on the lever held it in the engaged position. However, this last time cutting I could feel grinding in my foot through the lever and the pto would stop turning but my boot would still have the lever in the engaged position.
    Can anyone tell me what is broken?
    Could I fix on my own (I'm a rookie), or would a mechanic have to fix?
    Cost?

  2. #2
    Elite Member JC-jetro's Avatar
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    Jul 2006
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    3,194
    Location
    Kansas
    Tractor
    Ford 1700, Kubota MX-4700

    Default Re: PTO disengaging while in use

    Quote Originally Posted by whistling dixie View Post
    My 1900 pto is disengaging while I bushhog. This problem started a few months ago and only happened once or twice during the time it took to cut 3 acres. Finally, last week the problem progressed to where my boot being lodged on the lever would not even keep it engaged. The previous time cutting my boot being lodged on the lever held it in the engaged position. However, this last time cutting I could feel grinding in my foot through the lever and the pto would stop turning but my boot would still have the lever in the engaged position.
    Can anyone tell me what is broken?
    Could I fix on my own (I'm a rookie), or would a mechanic have to fix?

    There is a spring and a ball part of a detent mechanism that works in conjunction with shift fork and pto sliding gear. There might be where your problem
    lies.You can go to NH website under part to see the illustration with the parts I explained. I can post a pdf of the parts tomorrow. Can you for ever tried to used a bungee cord, a piece of sting or wire to keep the pto lever in engaged position ? if it continue without jumping out I can say most likely is detent mechanism rather than sliding gear issue.

    JC,
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  3. #3
    Elite Member JC-jetro's Avatar
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    Jul 2006
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    Kansas
    Tractor
    Ford 1700, Kubota MX-4700

    Default Re: PTO disengaging while in use

    you might look at the pto diagram that is common to both Ford 1900 and 1700. PTO shifter fork is item #43, ball#44, spring #45 and arm#52. A notch in the arm hold the ball in place with the spring to make it tight and not sliding back and forth like what appears in you description (pto jumping out). The whole assembly #13 is your ORC (Over Running Clutch) or pto one way clutch. The engagement handle can easily be removed and the spring is behind the cover. The spring might be damaged or broken or the ball might be out of round.

    JC,
    Attached Files Attached Files
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  4. #4
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: PTO disengaging while in use

    with machine off.. grab the pto shaft and yank on it.. does it have any in / out movement.. if so.. it will walk a sliding coupler style clutch out of engagement.. chew the ends of the shaft and coupler, and eventually mushroom the internal end of the shaft from thrust play. usualy cause is bad bearing, damaged split ring or bearing carrier ring lands damaged.

    that is , if it is not a simply ball and detent problem.

    post back.

  5. #5
    Gold Member BeeferMan's Avatar
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    Jun 2008
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    Location
    North Central MA
    Tractor
    Case 1194, Ford 641, NH TT75A

    Default Re: PTO disengaging while in use

    Hate to say it, but if a foot on the lever won't keep it engaged it's unlikely to be the just detent mechanism. But that's certainly the first thing to check...
    ----------------------------------------------------------
    Case 1194, NH TT75A, Ford 600, Bobcat A300, balers, rakes, mowers, tedders, spreaders and lots of other toys as well...

    - Jim

  6. #6
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: PTO disengaging while in use

    any new news?

  7. #7
    New Member
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    Location
    Central MS
    Tractor
    Ford 1900

    Default Re: PTO disengaging while in use

    Thanks for all the input.
    Sound guy, if I yank on the pto shaft it only moves a millimeter or few at most both in and out and up, down, and side to side. It has had this much free play since I've had the machine, which is about a year. I didn't think this was the root of the problem. I figured it was an acceptable amount on a 30 year old machine.
    I spoke over the phone with local NH dealership last year when it did it for the first time and explained to them what I told you and didn't get much info just be careful when taking the lever off cause the spring may fall down into the tractor. If this did happen would I be able to get my hand down in there or does the tractor have to be split for thi

  8. #8
    Elite Member JC-jetro's Avatar
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    Kansas
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    Ford 1700, Kubota MX-4700

    Default Re: PTO disengaging while in use

    Below you see a typical geometry of the detent mechanism. in this case it is for the gear shifter mechanism. The ball can not fall in the transmission unless you take it out and just drop it in there. in the case of the shifter you can lose the spring if you do not withdraw the spring before taking the cover off. It is ball and then spring in a horizontal layout for your pto. Can't see how You can can lose it. No split is necessary or needed. Simply loosen the round cover (#53,54,55) that pto shaft handle goes thru and the the spring is right behind it. Did you look at the diagram I previously posted?

    JC,





    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  9. #9
    New Member
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    Central MS
    Tractor
    Ford 1900

    Default Re: PTO disengaging while in use

    JC, your pictures and diagrams should help a lot. Looks like its time for me to get my hands dirty. In the last picture, what do all the springs go to? Are they just extras you have or do they all go in the tractor? What are the 4 things in the bottom of the picture?
    Thanks

  10. #10
    Elite Member JC-jetro's Avatar
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    Kansas
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    Ford 1700, Kubota MX-4700

    Default Re: PTO disengaging while in use

    Quote Originally Posted by whistling dixie View Post
    JC, your pictures and diagrams should help a lot. Looks like its time for me to get my hands dirty. In the last picture, what do all the springs go to? Are they just extras you have or do they all go in the tractor? What are the 4 things in the bottom of the picture?
    Thanks
    There are for shifter Boss's along with their associated shifter fork and the 4 spindles. Spindles have concave holes with about the same dia of the the steel detent balls. so each spindle /shifter combination gets one ball and one spring and the bolt on top. On mine one of them had 2 spring , one inside another and never figured out why.The original factory diagram don't show that. I reckon it was added by the previous owner to make it a bit stiffer to avoid jumping out. obviously my pics show the transmission but the concept is exactly the same. Do look up at the file I attached a few posts ago. you have one ball and spring for your pto. it is not a difficult job to inspect. can you keep it from jumping by a piece of bailing wire?

    JC,
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

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