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  1. #1
    New Member
    Join Date
    Jun 2012
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    3
    Location
    El Dorado Springs,Mo.
    Tractor
    185 AC

    Default 617 disc mower

    Have a NH 617 disc mower that mowed about 10 feet and all discs quit rotating. Belts are intact and driving gearbox. Individual discs turn when moved by hand. Mower made no noise, just quit. Drive module was found with no oil level. Did something shear? Any help appreciated.

  2. #2
    Gold Member
    Join Date
    Jan 2012
    Posts
    341
    Location
    Winchester Ky
    Tractor
    Allis Chalmers ED 40

    Default Re: 617 disc mower

    What do you mean by "drive module was found with no oil level"? Are you referring to the module directly below the gearbox, and do you mean you found that it contained no oil? When you rotate the blade units by hand, do all of them rotate, or just some of them? Does the gearbox have oil to the level plug? If the drive module itself has run low enough on oil, it may have failed a bearing and allowed the pinion gear to move away from the drive gear from the gearbox. I just went through the gearbox on a 617 a few weeks ago. This problem was within the gearbox but the module below was OK. If your problem is in the module, and the gear from the gearbox is undamaged, it will be far less work and expense.

  3. #3
    New Member
    Join Date
    Jun 2012
    Posts
    3
    Location
    El Dorado Springs,Mo.
    Tractor
    185 AC

    Default Re: 617 disc mower

    Yes, I mean the module directly below the gearbox. It contained no oil level when I removed the lower plug. All of the units rotate when turned by hand.

  4. #4
    Gold Member
    Join Date
    Jan 2012
    Posts
    341
    Location
    Winchester Ky
    Tractor
    Allis Chalmers ED 40

    Default Re: 617 disc mower

    These things are a bit awkward to work on, but this repair is rather straight forward. Raise the unit up to the transport position to relieve tension on the assist spring and disconnect the spring. Let the unit back down to the ground, and remove the six bolts securing the gearbox to the drive module. When you raise the three point the cutter bar will remain on the floor with the drive module exposed.

  5. #5
    New Member
    Join Date
    Jun 2012
    Posts
    3
    Location
    El Dorado Springs,Mo.
    Tractor
    185 AC

    Default Re: 617 disc mower

    Thanks for the input.

  6. #6
    Veteran Member whodat526's Avatar
    Join Date
    Apr 2010
    Posts
    1,529
    Location
    deridder louisiana
    Tractor
    fords

    Default Re: 617 disc mower

    also check the bottom gear and shaft in the main gear box my 616 did the same thing last year and the problem was the bearings in the lower module went out and when it did it also knocked the lower bearing out the bottom gear in the gear box

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