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  1. #1
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    Belarus 825 & 8345, NH TS110, JD 4010 LP & Dsl, White 2-105, Oliver 1850, Ford 5000 dsl, MF 65 LP x 2 , JD 410 BACKHOE, CAT 112B Hoe, CAT 944 Loader, CAT 613 scraper, Cat D6 Dozer, Case 1150 Dozer, Case 930 Dsl, Case 930 LP,

    Default NH 617 Disc Mower short Gearbox life

    My NH 617 was not used much by the previous owner. He only mowed about 120 acres or less a year. The gears between the right angle drive box and the cutterbar were replaced by the previous owner because there was not any grease in the box. I ran it about 200 acres and the gearbox fails and it is dry. I did not know where to check this box for lube, and thought it was lubricated by the upper gearbox. I replaced the box with a new module and cut approximately 200 acres of prairie hay last year, and then changed all bearbox oil this spring and filled them with Mystic JT-7. I made sure the replaced module had lubricant. I cut less than 120 acres and it failed again. a friend that works on hay equipment for a large dealer and delivers hay equip all over the West. He said that they do not send a mower out without Lucas oil additive in the gearboxes. This box is $350 to replace. Does anyone have any ideas? I cannot afford to keep this up.... The bearings appeared to be good on the other shafts. Is the lack of Lucas oil the problem???

    This is in Oklahoma if it makes any difference.

  2. #2
    Elite Member
    Join Date
    Sep 2008
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    3,214
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    NE USA
    Tractor
    JD LA115, WH 244, WH 525 hydro-pops,Original Troy Built Horse 8 HP

    Default Re: NH 617 Disc Mower short Gearbox life

    Quote Originally Posted by crbearden View Post
    My NH 617 was not used much by the previous owner. He only mowed about 120 acres or less a year. The gears between the right angle drive box and the cutterbar were replaced by the previous owner because there was not any grease in the box. I ran it about 200 acres and the gearbox fails and it is dry. I did not know where to check this box for lube, and thought it was lubricated by the upper gearbox. I replaced the box with a new module and cut approximately 200 acres of prairie hay last year, and then changed all bearbox oil this spring and filled them with Mystic JT-7. I made sure the replaced module had lubricant. I cut less than 120 acres and it failed again. a friend that works on hay equipment for a large dealer and delivers hay equip all over the West. He said that they do not send a mower out without Lucas oil additive in the gearboxes. This box is $350 to replace. Does anyone have any ideas? I cannot afford to keep this up.... The bearings appeared to be good on the other shafts. Is the lack of Lucas oil the problem???

    This is in Oklahoma if it makes any difference.
    I wonder if the previous owner replaced the seals on the geearbox?


    Were the gear box seals replaced as well? its sounds as if the seals failed on you.
    New seals last long time as long as the shafts are good-they do wear because of
    the rotating shafts.

    If you cannot find the fill or level plugs they must be buried under paint or dirt.
    It sounds as if the gearbox has either a very heavy coat of paint on it hiding the
    fill and drain plugs or a lot of dirt hiding the fill and drain plugs.

    NOW the plugs may be oil plugs that require an allen wrench to remove them to
    add lubricant or to check the oil levels which may explain why you cannot find the plugs.

    Edit: if the bearings were bad and the original owner did not repalce them that would
    shorten the seal life signifigantly also .

  3. #3
    Elite Member
    Join Date
    Dec 2007
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    3,072
    Location
    texas
    Tractor
    7040 HDC 1153 fel

    Default Re: NH 617 Disc Mower short Gearbox life

    bottomline its time for you to get a new cutter.that cutter has major probs.

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