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  1. #1
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default JD 4300: opening up the gearbox to repair broken PTO and range shift

    I am starting this as a new thread, but it is really just one chapter in my
    concurrent thread,
    2001 John Deere 4300 HST tractor extensive repairs and refurbishment:
    http://www.tractorbynet.com/forums/p...-4300-hst.html

    This is my 2001 JD 4300, and I need to repair the PTO, which turns,
    but makes noise, and does not brake when turned off. Also, the range
    shift shaft is broken off flush with the gearbox housing, leaving the
    transmission in LOW range.

    I had both of these problems with my 2000 4300 tractor, so I am not
    expecting any big surprises here.

    Pix are before and after cleaning in prep for lifting off the 3-pt cylinder
    housing.
    Attached Thumbnails Attached Thumbnails -before_clng-jpg   -after_clng-jpg  

  2. #2
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    First I drained all the hydraulic oil and removed the inlet filter screen.
    That leaves about a cup of oil in the bottom of the sump, so I
    removed the PTO cover to clean that out and see what's in there.

    It does not look good. I recognize the 4 brake engagement levers
    on the right side of the first photo, apparently attracted to the
    magnetic drain plug. Also broken pieces of the brake friction discs
    are evident.

    I lifted off the 3-pt housing and see why: the brake basket has
    broken in half! All the engagement levers and their pins fell out
    (second photo). One of the brake friction discs seems to have broken
    up, but the others and the plates remain in place. The PTO clutch
    looks OK.
    Attached Thumbnails Attached Thumbnails -gearbox_1-jpg   -gearbox_2-jpg  

  3. #3
    Elite Member Ductape's Avatar
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    Central New Hampshire
    Tractor
    Kubota B3030HSDC

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    Wow !

    I always enjoy your threads going deep into the bowels of your tractors. I consider myself very mechanically inclined, but would never attempt half the repairs you do on tractors. I learn quite a bit from your threads on repairs.

  4. #4
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    After cleaning up all the innards, here is my collection of parts.
    The hyd fluid suction filter was quite covered with small metal
    fragments, mostly from the clutch and brake.

    All the gearbox gears and bearings seem OK.

    My plan is to eliminate the PTO brake instead of fixing it. The
    downside to that is the PTO shaft will spin even when the lever
    that mechanically engages it is OFF. That's due to the inherent
    nature of these motorcycle-type wet clutches. There is a lot
    of drag when disengaged, especially when the fluid is cold. This
    tractor's PTO engagement lever is very smooth and easy to
    operate, much more so than the last 4300 I had.

    The third photo shows the PTO brake with broken parts removed
    and the large rear aluminum bulkhead about to be reinstalled.
    If you look closely, you can see that there is only one PTO brake
    friction disc remaining.

    So is everyone with a 4x00 or 4x10 tractor doomed to eventually
    breaking their PTO clutch or brake? My guess is not if
    you don't turn on or off the PTO at high RPM when running a rotary
    mower or worse, a chipper. Be gentle, and don't lend out your
    tractor.

    JPINCA also bought one of the 4300s from the same local rental company,
    and his also had a broken PTO brake basket. And range shift shaft.
    http://www.tractorbynet.com/forums/j...ft-repair.html
    Attached Thumbnails Attached Thumbnails -gearbox_3-jpg   -gearbox_4-jpg   -gearbox_5-jpg  

  5. #5
    Member
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    Location
    South San Francisco Bay, CA
    Tractor
    JD 2000 4300 HST 4WD

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    After being inside one of these, I'm now very careful to gently shift between the ranges and minimize the stress on the PTO brake.

    I idle the engine and then disengage the PTO slowly rather than move directly from engage to disengaged. I suspect the breakages are due to operator ignorance or indifference- mostly engaging/disengaging the PTO at full speed. I think these rental tractors only ever had a tiller attached, so the brake breakage seems kinda strange. My mower or chipper seem to put WAY more stress on the brake, even when done gently.
    Ex-rental 2000 John Deere 4300 HST 4WD with 420 loader, Deere tiller, and Land Pride box scrapper. 2500 hours

  6. #6
    Veteran Member kebo's Avatar
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    Lexington, SC
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    2001 John Deere 790 4x4, bar tires

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    Quote Originally Posted by dfkrug View Post

    My plan is to eliminate the PTO brake instead of fixing it. The
    downside to that is the PTO shaft will spin even when the lever
    that mechanically engages it is OFF. That's due to the inherent
    nature of these motorcycle-type wet clutches. There is a lot
    of drag when disengaged, especially when the fluid is cold. This
    tractor's PTO engagement lever is very smooth and easy to
    operate, much more so than the last 4300 I had.


    http://www.tractorbynet.com/forums/j...ft-repair.html
    Just curious, but can you tell us why you decided to not replace the broken/damaged parts? Is this just a cost savings move??
    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....

  7. #7
    Elite Member rekees4300's Avatar
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    Indiana
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    JD 4300, JD X500

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    Quote Originally Posted by dfkrug View Post

    So is everyone with a 4x00 or 4x10 tractor doomed to eventually
    breaking their PTO clutch or brake? My guess is not if
    you don't turn on or off the PTO at high RPM when running a rotary
    mower or worse, a chipper. Be gentle, and don't lend out your
    tractor.
    For rotary mower I always raise it then idle engine before engaging or disengaging the PTO. So far no problems for 12 years. The PTO level is sometimes hard to move but think that's just a characteristic of a 4300? I have only loaned my tractor to a neighbor once. When he bought it back he apologized for not filling it with gas! When I told him that wouldn't have been a good idea since it's a diesel engine his face became a tad red!

  8. #8
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    Quote Originally Posted by kebo View Post
    Just curious, but can you tell us why you decided to not replace the
    broken/damaged parts? Is this just a cost savings move??
    No doubt the parts are expensive, but that is not the primary reason I
    am going without a PTO brake. I don't think you need one and it makes
    the PTO lever harder to operate.

    I did not have to do much to fix the last 4300's brake, tho one friction disc
    had cracked. I replaced one friction disc on that unit's PTO clutch. You have
    to buy clutch packs as a set and 2 y ago that was $400. I was fortunate to
    find a single disc in a pile of spares.

  9. #9
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    Quote Originally Posted by jpinca View Post
    I think these rental tractors only ever had a tiller attached, so the
    brake breakage seems kinda strange. My mower or chipper seem to put WAY more stress
    on the brake, even when done gently.
    Most of the 4300s were rented with tillers, but when they were first purchased the
    rental yard still offered 3-pt mowers and box blades. Those were sold off years
    ago.

    Breaking the PTO brake running a tiller just shows that turning the PTO on and
    off at full RPM was often done by renters. The previous group of tractors also
    suffered many PTO breakdowns (JD 955).

  10. #10
    Super Star Member RoyJackson's Avatar
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    Bethel, Vermont
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    John Deere 4400 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: JD 4300: opening up the gearbox to repair broken PTO and range shift

    Quote Originally Posted by dfkrug View Post
    So is everyone with a 4x00 or 4x10 tractor doomed to eventually
    breaking their PTO clutch or brake? My guess is not if
    you don't turn on or off the PTO at high RPM when running a rotary
    mower or worse, a chipper. Be gentle
    , and don't lend out your
    tractor.
    I go a bit further...when I idle down, I let it continue to idle for a short time (15-20 seconds) to let the implement spin down completely. This works for my finishing mower (Frontier, but made by Woods) and chipper/shredder (also Woods). Rotary cutters (mine is a Land Pride) can take quite a while to spin down completely.
    Roy Jackson

    "Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
    -Joseph P. Martino

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