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  1. #1
    Gold Member psdx's Avatar
    Join Date
    Nov 2006
    Posts
    456
    Location
    London, OH
    Tractor
    Kubota B3030

    Default ZD331 Axle Not Square With Frame

    The ZD331 has stops welded onto the frame on both sides - looks like they're meant to keep the axle tube from getting sprung backwards. The left side of the axle on mine starting banging against the stop at 60 hours. The solution was to tighten the bolt on the pivot pin - not sure how it would have loosened with a clip holding it stationary. After the tightening, the left side gap (between the axle tube and the stop) is about 1/8 inch, while the same gap on the right side is about 3/8 inch. Clearly the axle tube is not square with the frame. The service writer and I went into the shop to look at a brand new ZD331 that was just being set up for a customer. The clearances between the stops and the axle were exactly like mine. From this I assume mine is not damaged in any way, but I am wondering if others with ZD331's have a similar disparity between the right/left axle clearances. I am also interested to know if anyone can offer a suggestion on why kubota would "design" it this way. BTW - if this is the wrong forum to ask this question - please let me know. Thanks.
    Kubota B3030, LA403 FEL, Woods RB72 Back Blade, LandPride GS1560 Grading Scraper, Frontier CA2060E Aerator, Kubota ZD331-72 mower, John Deere x575 & 47" snowblower

  2. #2
    Platinum Member Berniep's Avatar
    Join Date
    May 2005
    Posts
    609
    Location
    Greensburg IN
    Tractor
    2005 BX23

    Default Re: ZD331 Axle Not Square With Frame

    Very interesting. I am really wanting a ZD326 and have wondered about the pivot strength but I figured that they had this covered. There is a farmer up the road that has a guy on a 331 running pretty much constantly Monday through Friday all summer with no problems. If I get a chanced I will have to ask about this issue.
    Bernie

  3. #3
    Gold Member psdx's Avatar
    Join Date
    Nov 2006
    Posts
    456
    Location
    London, OH
    Tractor
    Kubota B3030

    Default Re: ZD331 Axle Not Square With Frame

    A year ago (60 hours), the dealer tightened the kingpin enough to put the key in the next slot. Now (a year later at 120 hours), the axle is banging against the frame again. I grease the machine often... I did what the dealer did and the wobble is gone. It's strange to me that the new machine I saw being un-crated was the same as mine - axle closer on one side than the other, and it's strange that this bushing is apparently wearing fairly fast. If this was used commercially, the kingpin adjustment would need to be done every other week, and by now the bushing would likely be worn out completely.

    This is inconsistent with my expectation of a machine priced at the high end of what's out there. Does anyone else with a ZD mower have a similar experience? Or someone else with a mower with an articulating axle that has similar wear?
    Kubota B3030, LA403 FEL, Woods RB72 Back Blade, LandPride GS1560 Grading Scraper, Frontier CA2060E Aerator, Kubota ZD331-72 mower, John Deere x575 & 47" snowblower

  4. #4
    Super Member
    Join Date
    Apr 2000
    Posts
    6,235
    Location
    central New York
    Tractor
    all makes and models

    Default Re: ZD331 Axle Not Square With Frame

    I guess I'm going to have to go look at some of those we have out. Never had a problem here.

  5. #5
    Bronze Member rglaser's Avatar
    Join Date
    Jun 2009
    Posts
    87
    Location
    Waynesville, Ohio
    Tractor
    Kubota B2630 & ZD323

    Default Re: ZD331 Axle Not Square With Frame

    I have a ZD323 and mine rubs the body panel but not the frame yet (40 hours). It is much closer on the left than the right side.

    -Rob

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