Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1
    Silver Member Rockin' G Ranch's Avatar
    Join Date
    Apr 2008
    Posts
    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default Agric Tiller Problem

    I have an Agric AL50. The bolts holding the gearbox to the tiller keep either backing out or shearing off. I drilled and tapped the 2 holes in the gearbox to a size larger bolt, installed larger hardened bolts and a plate to prevent the bolts from backing out. Well, they don't back out - they now shear off. Have any of you had this happen and what did you do to remendy it?
    I am considering installing a U bolt around the shaft carrier pipe and secure it to the top of the tiller housing between the gear box and the top chain sproket.

  2. #2
    Elite Member wushaw's Avatar
    Join Date
    Mar 2005
    Posts
    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: Agric Tiller Problem

    I have the 45" gear driven model, it is only a year old and no shearing of the bolts on mine....atleast not yet.

    Have you tried grade 8 bolts?

  3. #3
    Silver Member Rockin' G Ranch's Avatar
    Join Date
    Apr 2008
    Posts
    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default Re: Agric Tiller Problem

    Quote Originally Posted by wushaw
    I have the 45" gear driven model, it is only a year old and no shearing of the bolts on mine....atleast not yet.

    Have you tried grade 8 bolts?
    Yes. The larger new bolts I installed are grade 8. The only support for the gear box and drive carrier to the top chain sproket is the 2 bolts. Most other tiller manufacturers have other supports between the gear box and chain housing or support pipe to the other side of the tiller. That's why I thought the additional U bolt support would help.

  4. #4
    Elite Member wushaw's Avatar
    Join Date
    Mar 2005
    Posts
    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: Agric Tiller Problem

    Ok are you talking about the two bolts holding the top/angled gearbox in place there on the R/H side of the gearbox?

    http://www.tractorbynet.com/forums/a...d-dsc00352.jpg

  5. #5
    Silver Member Rockin' G Ranch's Avatar
    Join Date
    Apr 2008
    Posts
    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default Re: Agric Tiller Problem

    Quote Originally Posted by wushaw
    Ok are you talking about the two bolts holding the top/angled gearbox in place there on the R/H side of the gearbox?

    http://www.tractorbynet.com/forums/a...d-dsc00352.jpg
    Yes. The 2 bolts (that you can't see in the picture) on the RH side of the gear box in your picture. The bolts go through a piece of angle iron welded to the top of the tiller housing in to threads in the tiller gear box.
    Bolts marked #11 in attached picture.
    Last edited by Rockin' G Ranch; 04-20-2008 at 08:46 PM.

  6. #6
    Elite Member wushaw's Avatar
    Join Date
    Mar 2005
    Posts
    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: Agric Tiller Problem

    Well that is interesting. The only thing I can think of is something is causing alot of torque to sheer them bolts off.

    Does everything else operate smooth, nothing binding up or anything like that.

    If all else fails then you could add another bracket to pick up the bolts on the back side to assist in holding the gearbox in place.

  7. #7
    Silver Member Rockin' G Ranch's Avatar
    Join Date
    Apr 2008
    Posts
    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default Re: Agric Tiller Problem

    Quote Originally Posted by wushaw
    Well that is interesting. The only thing I can think of is something is causing alot of torque to sheer them bolts off.

    Does everything else operate smooth, nothing binding up or anything like that.

    If all else fails then you could add another bracket to pick up the bolts on the back side to assist in holding the gearbox in place.
    The tiller vibrates a lot when working and that shaft has a lot of torque in it. Those 2 bolts take the brunt of the vibration and torque. I figure the combination of vibration and torque back-out or shear the 2 bolts. That's why I thought a U bolt between the right-angle tiller gear box and the chain cover would help.

  8. #8
    Elite Member wushaw's Avatar
    Join Date
    Mar 2005
    Posts
    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: Agric Tiller Problem

    U bolt with a spacer would help.

  9. #9
    Veteran Member
    Join Date
    Oct 2006
    Posts
    1,212

    Default Re: Agric Tiller Problem

    something si wrong
    it shouldn't vibrate like that
    and those bolts shouldn't shear
    I probably have a 100 acres or more of tilling on my 5' agric over the last couple years and those bolts are still fine.

    you're fixing the sympton, not the problem. something is torqued down below.

  10. #10
    Silver Member Rockin' G Ranch's Avatar
    Join Date
    Apr 2008
    Posts
    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default Re: Agric Tiller Problem

    Quote Originally Posted by LoneCowboy
    something si wrong
    it shouldn't vibrate like that
    and those bolts shouldn't shear
    I probably have a 100 acres or more of tilling on my 5' agric over the last couple years and those bolts are still fine.

    you're fixing the sympton, not the problem. something is torqued down below.
    Thanks for the responses. Any ideas what could be causing the over torqueing problem?????? The tines rotate freely by hand when the PTO is not attached to the tractor. The only thing I can think of is very hard clay undercoating the bottom of the tiller housing causing very little if any clearance for the tines. This happens after tilling for a while in some of my more loamy fields. the bolts have backed out or sheared off at least a dozen times.
    By the way, I don't have a clutch or shear bolt on the PTO drive to the tiller. Could this be part of my problem? I know I should have one but I wouldn't think it would solve this problem.
    If anyone has anymore ideas I would appreciate the help. Thanks.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.