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  1. #1
    Member
    Join Date
    May 2012
    Posts
    35
    Location
    Shelbyville, ky
    Tractor
    Massey 35

    Default Yanmar1720d

    Hey gang
    My 1720d is working out great but I have a problem that requires your collective wisdom and guidance .
    I have an output seal in the drop box that is leaking slightly so yesterday, before ordering the seal, I raised the unit up and realized that the pto was not turning when engaging the shifter. It sounds like/feels when I move the shifter it's engaging a slide gear or something but nothing happens...no noise but PTO is dead.
    I disconnected PTO at drop box and when I spin the front wheels turn and the diff seems to be working under no load.
    I could use your guidance as to what to check, possible issues and even what to disassemble systematically to locate the issue. I have ordered a parts manual from Hoyte
    and plan to see of they have

  2. #2
    Member
    Join Date
    May 2012
    Posts
    35
    Location
    Shelbyville, ky
    Tractor
    Massey 35

    Default Re: Yanmar1720d

    Meant to end with...to order a shop manual...

  3. #3
    Elite Member
    Join Date
    Dec 2009
    Posts
    2,703
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Yanmar1720d

    Sounds to me like you are going to have to remove the drop box. I have no manual but am guessing it will come off in one piece.

  4. #4
    Super Member kenmac's Avatar
    Join Date
    Feb 2005
    Posts
    5,741
    Location
    The Heart of Dixie
    Tractor
    yanmar 3110D

    Default Re: Yanmar1720d

    Are you talking about PTO or, drop box for front wheel drive ? I don't know of a drop box for PTO
    Yanmar 3110D
    07 Dodge 2500 5.9 Cummins
    Husky 372xp
    Husky 55 Rancher
    Maruyama trimmer
    Husky trimmer
    Redmax BP blower
    Toro zero turn
    North Star 4 K PSI pressure washer
    Honda 300 4 trax
    Yamaha Timberwolf
    liquid logic coupe kayak
    16' Tow Master Dump Trailer ,20' Yanmar Hauler

  5. #5
    Member
    Join Date
    May 2012
    Posts
    35
    Location
    Shelbyville, ky
    Tractor
    Massey 35

    Default

    Talking about drop box for 4wd. The front seal is leaking where drive shaft comes out(around yoke) of drop box...slightly but enough to be replaced. When preparing to disassemble I set on four jack stands and engaged 4wd lever but drive shaft was not moving. Read original post for further details. Looking for ideas, things to look for, things to try etc from those who have worked on these. I am a mechanic by trade and have worked a lot on old fords for years but this is a new detention for me so I need some guidance so that I don't do work that is not necessary or tear off stuff I don't need to.......any guidance would be helpful... Thanks

  6. #6
    Super Member kenmac's Avatar
    Join Date
    Feb 2005
    Posts
    5,741
    Location
    The Heart of Dixie
    Tractor
    yanmar 3110D

    Default Re: Yanmar1720d

    there should be (4 ?) steel balls at the front drive shaft coupling. are they there ? On my tractor ,the front drivr shaft turns inside a tube. If yours is like mine you have to remove the tube to see the drive shaft
    Yanmar 3110D
    07 Dodge 2500 5.9 Cummins
    Husky 372xp
    Husky 55 Rancher
    Maruyama trimmer
    Husky trimmer
    Redmax BP blower
    Toro zero turn
    North Star 4 K PSI pressure washer
    Honda 300 4 trax
    Yamaha Timberwolf
    liquid logic coupe kayak
    16' Tow Master Dump Trailer ,20' Yanmar Hauler

  7. #7
    Member
    Join Date
    May 2012
    Posts
    35
    Location
    Shelbyville, ky
    Tractor
    Massey 35

    Default

    Quote Originally Posted by kenmac
    there should be (4 ?) steel balls at the front drive shaft coupling. are they there ? On my tractor ,the front drivr shaft turns inside a tube. If yours is like mine you have to remove the tube to see the drive shaft
    I'll have to look In the morning. It's inside a plastic sleeve that I removed the boot and slid together yesterday to see if the shaft was turning. I'll look in the morning and let you know

  8. #8
    Super Member kenmac's Avatar
    Join Date
    Feb 2005
    Posts
    5,741
    Location
    The Heart of Dixie
    Tractor
    yanmar 3110D

    Default Re: Yanmar1720d

    check for the steel balls in the front coupler if the shaft is turning. if the shaft isn't turning ,your problen may be where you enguage the 4 wd shifter or drop box
    Yanmar 3110D
    07 Dodge 2500 5.9 Cummins
    Husky 372xp
    Husky 55 Rancher
    Maruyama trimmer
    Husky trimmer
    Redmax BP blower
    Toro zero turn
    North Star 4 K PSI pressure washer
    Honda 300 4 trax
    Yamaha Timberwolf
    liquid logic coupe kayak
    16' Tow Master Dump Trailer ,20' Yanmar Hauler

  9. #9
    Elite Member
    Join Date
    Dec 2009
    Posts
    2,703
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Yanmar1720d

    Steel balls are #34 in this parts drawing. Yanmar Tractor Parts: 4WD INTERNAL

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