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  1. #1

    Default 3 pt. Disc harrow axle nut

    After discing for awhile today I noticed between two of the disc blades I was plugged up. After clearing the mess I noticed that the disc blades are now loose on the axle. There are two nuts on the ended of the axle. I loosened the lock nut and attempted to tighten the inner nut. It seems tight. Plus I can't seem to figure out how to hold the axle and tighten the nut. The axle seems to be inside some spacers. I had a pipe wrench on one of the spacers and tightened the nut as tight as I could and the discs are still loose. Any ideas on how to hold the axle from turning so I can jump on the wrench to try to tighten the nut tighter? It was getting dark so I couldn't see exactly what I am up against. Is it possible that I've bottomed out on the threads and need to put a washer on for a spacer?
    I suppose I could lower the entire disc down on a block of wood under one of the disc plates on that axle to see if that would keep it from turning while I attempt to tighten the nut.
    Attached Thumbnails Attached Thumbnails -img_0199-jpg  
    Last edited by Couple of Achers; 03-29-2010 at 11:09 PM.

  2. #2
    Elite Member Mace Canute's Avatar
    Join Date
    Nov 2006
    Saskatoon, Saskatchewan

    Default Re: 3 pt. Disc harrow axle nut

    Yes, you may have ran out of thread and need a spacer. Drop the disc down completely and the friction between the ground and the discs should be more than enough to keep it from rotating. I'd back the nut off completely to inspect the threads, they may need a tad of touch up with a triangular file.

  3. #3
    Veteran Member
    Join Date
    Aug 2001
    michigan thumb
    jd 970, JD GT235

    Default Re: 3 pt. Disc harrow axle nut

    Just consider yourself lucky you are not trying tighten a round axle like my leinbach disk had

  4. #4
    Silver Member emmy71's Avatar
    Join Date
    Nov 2005
    North Carolina Piedmont
    Kubota L3400 HST

    Default Re: 3 pt. Disc harrow axle nut

    I fought this exact same problem last Saturday except with a round shaft that kept turning inside the discs. I finally tack welded the end of the shaft to the disc and wedged a pipe in the disc to keep it form spinning. Dropping it on the ground did not work because I had a pipe wrench with a pipe on the end for leverage and it just spun the disc sitting on the ground. Finally got everything tightened up and hit the tack welds with the grinder. If yours has a square shaft I would think you should be able to wedge a pipe or something in the discs to keep them from spinning. This is all assuming you have some threads left to tighten.

    2006 Kubota L3400 HST, R4's, LA 463 loader.
    Landpride FDR1672 mower, Hawkline 5' rotary cutter, 5' United boxblade, 6' scrape blade, Woods 5000 chipper/shredder

  5. #5
    Veteran Member
    Join Date
    Sep 2005
    Case DX55, Ford 850

    Default Re: 3 pt. Disc harrow axle nut

    I have a round shaft disk and used a pipe wrench between the disks to hold it while tightening as you described. Lowering it onto wood blocks did not hold mine since the round shaft still turns inside the bearings. Yours does look like it has quite a bit of exposed threads so you might be right about needing a spacer. When I tightened mine last time, I removed the nuts and washers and coated the threads with never-seize. That made it easier to tighten them up snug.

  6. #6

    Default Re: 3 pt. Disc harrow axle nut

    Thanks everybody. Problem solved. I was at the end of the threads on the axle. I put a couple of 1" washers on first, then the nut. It tightened right up. I have to believe it was probably never snugged up properly from day one and that is why that gang loosened up and the other three have not. I wish all the fixes where that easy.

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