Page 1 of 3 123 LastLast
Results 1 to 10 of 21
  1. #1
    New Member
    Join Date
    Jun 2010
    Posts
    13
    Tractor
    John Deere F935

    Default Yanmar/F935 rubber coupler/isolator

    Hi, thanks for a great forum.







    As you can see the new coupler is under stress when installed. Part of this is lack of clearance between the drive shaft and the flywheel and part is because the drive shaft connects at an angle rather than being perfectly straight. I am considering grinding off maybe .030 - .035 inch of the pads on one side. Will installing this way lead to premature failure? Looking for any suggestions or input on this situation.
    Thanks again.

  2. #2
    Super Star Member kennyd's Avatar
    Join Date
    Jul 2003
    Posts
    11,470
    Location
    Westminster, MD
    Tractor
    John Deere 4110

    Default Re: Yanmar/F935 rubber coupler/isolator

    Welcome to TBN

    I think you need to find the root cause of the mis-alignment, such as worn motor mounts or driveshaft supports.
    John Deere 4110HST
    FEL, MMM, Artillian 42" Forks, I-Match, Ballast Box, #380 plow (modified to fit), Markham LD-48 Grapple, Trac-Vac 854 and lots of other STUFF.

    John Deere 4x2 Turf Gator

    View some of my projects/adventures in my Picasa Album

    Simple JDParts Tutorial HERE

  3. #3
    Veteran Member
    Join Date
    Mar 2008
    Posts
    1,499
    Location
    Maine
    Tractor
    Deere 3520 Cab, Deere F935

    Default Re: Yanmar/F935 rubber coupler/isolator

    Quote Originally Posted by kennyd View Post
    I think you need to find the root cause of the mis-alignment, such as worn motor mounts or driveshaft supports.
    Common "problem"...but those isolators arent really a problem, its more of a wear/consumable part.

    That being said...mine isnt as tight as yours is...its not loose, but not tight enough to deflect the rubber like yours.

  4. #4
    Veteran Member zzvyb6's Avatar
    Join Date
    Dec 2006
    Posts
    2,493
    Location
    michigan
    Tractor
    jd 1070

    Default Re: Yanmar/F935 rubber coupler/isolator

    Check for a broken or sagged enging mount. Mine is as straight as you could want but wore out anyways (F935).
    There is no "I" in team, but there is a "Me" if you want to jumble it up a bit...

  5. #5
    Veteran Member
    Join Date
    Mar 2008
    Posts
    1,499
    Location
    Maine
    Tractor
    Deere 3520 Cab, Deere F935

    Default Re: Yanmar/F935 rubber coupler/isolator

    Quote Originally Posted by zzvyb6 View Post
    Check for a broken or sagged enging mount. Mine is as straight as you could want but wore out anyways (F935).
    zzvyb6 is right, it SHOULD be perfectly straight...I bet thats where your misalignment comes from.

  6. #6
    New Member
    Join Date
    Jun 2010
    Posts
    13
    Tractor
    John Deere F935

    Default Re: Yanmar/F935 rubber coupler/isolator

    Thanks for the input.
    I shaved .020 off each pad. That helped a lot. I can't believe how much smoother the mower is. That old coupler must have really let the drive shaft wobble around. I will try to get it straight when I have time. I have a lot of grass I need to mow and I have to spend a lot of time on this machine to keep it going.
    I was lucky to find the condition of the old coupler before it completely let go. I was under the machine installing the PTO clutch.

  7. #7
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
    Posts
    2,018
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: Yanmar/F935 rubber coupler/isolator

    You will find that the motor mounts have sagged. Mostly the rear ones. I had this problem with mine and it was the rear mounts. Having the alignment out that much also puts a strain on the input shaft to the transmission and it will eventually fail causing catastrophic failure. Big mess.

  8. #8
    Gold Member
    Join Date
    Nov 2006
    Posts
    250
    Location
    frozen Canada
    Tractor
    1962 IH B414

    Default Re: Yanmar/F935 rubber coupler/isolator

    what should the isolator bolts be torqued to, both the bolts to the driveshaft, and the mounting bolts to the pulley? do you also need blue loctite?

    thanks

  9. #9
    Gold Member
    Join Date
    Nov 2006
    Posts
    250
    Location
    frozen Canada
    Tractor
    1962 IH B414

    Default Re: Yanmar/F935 rubber coupler/isolator

    another question...there is a raised "shoulder" on the isolator. does the shoulder go against the driveshaft flange and pulley (like in Bogarts pic), or does the flush edge of the isolator go against driveshaft & pulley. It could be put in either way, so which way is correct?

  10. #10
    Veteran Member Mechanos's Avatar
    Join Date
    Aug 2010
    Posts
    1,042
    Location
    Roosterville, MO
    Tractor
    JD 955/70A/7 TLB

    Default Re: Yanmar/F935 rubber coupler/isolator

    Quote Originally Posted by Bogart View Post
    Hi, thanks for a great forum.







    As you can see the new coupler is under stress when installed. Part of this is lack of clearance between the drive shaft and the flywheel and part is because the drive shaft connects at an angle rather than being perfectly straight. I am considering grinding off maybe .030 - .035 inch of the pads on one side. Will installing this way lead to premature failure? Looking for any suggestions or input on this situation.
    Thanks again.
    You are off by one bolt hole on the installation of your new coupler. Remove all the bolts, rotate the coupler 60 degrees and reinstall all the bolts. Of course, now that you've shaved some material off the new coupler, that might cause "new" alignment issues.

Page 1 of 3 123 LastLast

Similar Threads

  1. BH76 Rubber Inserts
    By devildog1 in forum Kubota Owning/Operating
    Replies: 9
    Last Post: 02-25-2010, 03:04 PM
  2. Bobcat T300 rubber tracks vs steel tracks
    By ims in forum Rubber Tracks & Equipment
    Replies: 0
    Last Post: 09-11-2009, 11:55 AM
  3. Stunning find on Kubota 161 BUT is rubber ok..?
    By millpond in forum Rubber Tracks & Equipment
    Replies: 13
    Last Post: 08-23-2009, 07:49 PM
  4. Kubota KH-191 excavator track questions.
    By cheezomlet in forum Rubber Tracks & Equipment
    Replies: 17
    Last Post: 06-14-2009, 05:19 AM
  5. Rubber ISO mounts VS Steel ISO Mounts
    By gdechatham in forum Cub Cadet Tractors
    Replies: 13
    Last Post: 09-06-2008, 04:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.