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  1. #11
    Veteran Member
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    Apr 2000
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    1,431
    Location
    North Central Arkansas
    Tractor
    John Deere 4520,

    Default Re: John Deere LX5 rotary cutter squealing

    Quote Originally Posted by jrlogan View Post
    Thanks Ken. Will give it a try. You're right about the ridiculous prices of JD. I have a larger howse bush hog and I ordered the whole gear box for $320. This gear box is $872, and it's smaller and lighter duty... I'm kind wondering I could put a howse gear box in there and make it work...
    When the metal is gone from my bush hog brand rotory cutter . the gear box will be put in the carcus of the Mx6 I have. unless sitting so long it to will be rusted out.
    Think my next event with farm equipment will be a Pre-Estate sale.
    when the J.D. 4520 is worn out still have a A/C WD-45 being patient in the tractor shed.The old girl is gas likes to drink it also. but is all there.
    ken

    $872 is this a 40 hp gear box .

  2. #12
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default Re: John Deere LX5 rotary cutter squealing

    John Deere Gear Case - DE18961

    I can't find a HP rating on it, but it's probably 75ish. JD markets it for their smaller tractors, 50hp and down.

  3. #13
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default

    Quote Originally Posted by Ken
    jrlogan I had mentioned the shaft is tapored and looseing the nut allows the shaft to release quickly when struck with sledge hammer.
    The last thing you want done is the rotory cutter to fall on you doing this. I secure the cutter shell by chains attached to over head beam in shop.
    After secure place I use 4x4 x12" block between stump jumper and frame the blocks near the bolts holding the knives loosen the nut and I use large sockets 3/4 " brake over bar and about 4' cheater bar.
    Back the nut off until flush with end of shaft. then hit solid.
    I have used this on bush hog, busy bee and J.D. brand of bush hogs some use heat or other methods of freeing the knife bar.
    My comment of output shaft like glass is that there is a forum where the MX4-5-6-7 have broken output shafts.
    Mine may of had 40 hours on it mowing right of way grass when came apart.
    Almost new of another brand was cheaper than repair.
    ken
    Ken. Still can't get it off. I realized re-reading your post that we have different setups. Mine doesn't have a nut in the bottom but a bolt, as pictured. I have hit it quite hard with a sledge to no effect. Take a look at the pic. How do I get this thing apart?

    -image-3062847518-jpg

  4. #14
    Gold Member idaho2's Avatar
    Join Date
    Aug 2009
    Posts
    353
    Location
    SW WA / North Idaho
    Tractor
    Mahindra 5530 4WD Turbo - Gear,

    Default Re: John Deere LX5 rotary cutter squealing

    jrlogan,

    Put equally spaced wedges of 2x4 or similar wedges of wood between the jumper and the underside of the mower. Hammer these wedges in equally as far as you can. Now, resecure the bolt, but just allowing enough clearance for the stump jumper to drop when you hit the nut of the bolt with a large sledge hammer. May take a couple of swings but keep the pressure on from the wedges above the stump jumper. It should drop safely on the bolt and easily removed. Now you can access the gear box bolts.

    I can see why JD has had problems with the output shaft. No meat in the shaft with the bolt in it. Lousy design. Can you replace the output shaft but with a solid shaft and secured by a nut and cotter pin lock?

    Idaho2

  5. #15
    Veteran Member
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    Apr 2000
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    1,431
    Location
    North Central Arkansas
    Tractor
    John Deere 4520,

    Default Re: John Deere LX5 rotary cutter squealing

    Sometimes it just takes a bigger hammer.
    if it real rusted some blaster or type of break it loose sprayed on shaft will help there is several brands
    still takes a solid hammer blow.
    This is a 5' rotory cutter. maybe I'm thinking wrong. That bolt is about the size my lawn mower would have.
    ken

  6. #16
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default

    I've got steel wedges between the blade holder and the frame, I've hit the bolt so hard the bolt bent. I've heated it with a propane torch. There's got to be something different to do.

  7. #17
    Veteran Member Dutch445's Avatar
    Join Date
    Aug 2001
    Posts
    2,255
    Location
    Upstate NY
    Tractor
    JD X585

    Default Re: John Deere LX5 rotary cutter squealing

    time to use that thermonuclear separator!

    you should also notice on the top side of the pan that the blade holder is a heavy
    steel bar. i would make sure your wedges are above that bar area and not just the
    sides of the pan or stump jumper. that will give you pressure on the blade holder
    and not just the pan. (maybe you already have this covered)

    more heat may be required, keeping in mind you are heating thru the pan first
    then into that blade holder which is probably 1" thick, and it's hub that is surrounding
    the shaft.
    JD X585 with 45 loader, 3ph, 62C deck, 47SB, 54 blade, Soft Cab. JD F620 with 60". JD HPX gator. JD T23 trimmer
    JD CS56 and CS36 saws. JS35 WB mower.

  8. #18
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default

    Finally got it. I flipped the cutter over so I could take a full swing with a sledge. Took 2 direct hits to get it. Crazy. After tearing into the gear box I've learned that I have to do a complete rebuild to get to the lower bearings. The parts alone will be almost $200, not to mention all the time. I'm thinking about putting a howse gear box on it and welding in a new splined receiver to match in the blade holder. I can get a new gear box for $320 from howse. What do you guys think? Is there a different brand gear box I should look at?

    I also have a howse cutter that I tore into today and I was able to tear it apart and replace the gear box in just a couple hours. Much better design and easier to work on. No thermonuclear separator required!

  9. #19
    Gold Member
    Join Date
    May 2012
    Posts
    486
    Location
    NW Louisiana
    Tractor
    MF 35, Mahindra 4035

    Default Re: John Deere LX5 rotary cutter squealing

    Quote Originally Posted by jrlogan View Post
    Finally got it. I flipped the cutter over so I could take a full swing with a sledge. Took 2 direct hits to get it. Crazy. After tearing into the gear box I've learned that I have to do a complete rebuild to get to the lower bearings. The parts alone will be almost $200, not to mention all the time. I'm thinking about putting a howse gear box on it and welding in a new splined receiver to match in the blade holder. I can get a new gear box for $320 from howse. What do you guys think? Is there a different brand gear box I should look at?

    I also have a howse cutter that I tore into today and I was able to tear it apart and replace the gear box in just a couple hours. Much better design and easier to work on. No thermonuclear separator required!
    Just personal opinion, you've already got the gear box apart...."almost $200" is still cheaper than $320...if it were me, pure stuborness would lead me to the rebuild and reinstall option...I mean, after all you've got the time in it regardless of rebuilding or using a different gearbox...

    Rich

  10. #20
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default Re: John Deere LX5 rotary cutter squealing

    Rich. I can be pretty stubborn myself, so I get it. But my stubbornness is directed at rebelling against John Deere and their ridiculous prices. If I stick with this gear box by rebuilding it, then I have to deal with it again next time I have problems. Turns out I found a replacement gear box on ebay for $175 delivered. I think the design of the JD is actually inferior, as the new one is a more standard type box with a nut and cotter pin holding the blade holder rather than the silly bolt that I had so much trouble with above. Plus, though I haven't rebuilt one of these gearboxes before, looking at this one, I think it would be quite a chore. I have the gear box removed, but not apart. I think the bearings are pressed in place, and I would have to remove the input shaft to get the output shaft and bearings out. The $200 assumes that I don't break anything taking it apart, which I'm not at all confident of being able to do.

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