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  1. #11
    New Member
    Join Date
    Jan 2014
    Posts
    6
    Location
    Brush Prairie, Washington
    Tractor
    Yanmar 1820D

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Thanks

  2. #12
    Silver Member Bluest's Avatar
    Join Date
    May 2014
    Posts
    148
    Location
    Whitworth, Lancashire, UK
    Tractor
    Yanmar F14D, DR Wheeled Trimmer

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Have a look under the front of your seat. On mine there is a black wheel to adjust the rate of descent of the 3 point hitch. Turn it all the way anti clockwise should give you almost instant drop. If that doesn't work, I haven't a clue.

  3. #13
    Super Member jerrybob's Avatar
    Join Date
    Mar 2010
    Posts
    5,109
    Location
    Southwest Washington
    Tractor
    yanmar 186D....JD LT180....DR Brush Cutter

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Hey welcome from another Southwest Washington Yanmar owner........I am on the other side of the hills...towards the ocean......enjoy that Yanmar!
    I Intend to Live Forever.....So Far....So Good!

    My memory's not as sharp as it used to be.
    Also, my memory's not as sharp as it used to be.

  4. #14
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,652
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    There are likely two valves on that thing that affect drop rate.

    Bluest described the 'service valve' under the front of the seat. This valve should be closed (clockwise) when you want the implement to stay up forever, engine running or no. It chokes the return line from the 3-point. 99% of the time this valve should be left wide open, counterclockwise.

    The other valve to look for is the 'drop rate valve'. You adjust this one to get the desired drop rate, so that heavy implements don't come crashing down. This one's harder to find. Look for a tiny t-handle likely painted red. On some Yanmars it is halfway down the left side of the transmission under the left-rear of the seat. Adjust as needed.

    Here's the drop rate valve shown the manual for an older Yanmar. There is red tubing slipped over the T (L, in this case) to make it more visible.



    And Welcome!
    Last edited by California; 08-15-2014 at 04:42 PM. Reason: added diagram

  5. #15
    Member
    Join Date
    Jul 2005
    Posts
    41
    Location
    Western WA
    Tractor
    YM1820D

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Hi Rob,
    I'm up in the Yelm area, just below Ft. Lewis. My 1820D will drop my 4 ft Howse Brush Hog in a matter of seconds. It must be a pressure adjustment issue. Tractor Ernie, just south of Portland, used to deal in used Yanmars and has a wealth of experience and knowledge about them. If lucky, he may weigh in on your question. Sorry I can't be of specific help on this issue. The PTO low speed, 540 rpm, is quite sufficient for the grass, weeds and brush I have to contend with.

  6. #16
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,652
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Quote Originally Posted by FleetMan View Post
    It must be a pressure adjustment issue.
    It's not an issue of adjusting the hydraulic pressure.

    The point here is how fast the trapped hydraulic fluid is bled from the lift piston after you move the lever forward.

    If you open the slow return valve full open then move the lift lever forward ... your mower will crash down instantly.

  7. #17
    Elite Member
    Join Date
    Dec 2009
    Posts
    2,666
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    According to the parts mnaual I have for the 1820 it does not have the controls Californial has described. Rather, it has only the round knob under the seat that is called a slow/stop valve. It should be adjusted toward the closed position in order to control descent speed. Open it a little and your drop speed will increase. Yours may or may not have the looped hose shown there.
    Attached Thumbnails Attached Thumbnails -100_4959-jpg  

  8. #18
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,652
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Thanks Winston.

    Newfangled fancy tractors! All I know is the old simple ones. But I do look enviously at the modern ones once in a while.....

    Actually it makes sense that they combined the drop rate function into that stop valve since the purpose of both valves is to choke the fluid return line.

  9. #19
    Elite Member
    Join Date
    Dec 2009
    Posts
    2,666
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Yanmar 1820D Tire Adjustment & PTO Question from Washington

    Quote Originally Posted by California View Post
    Thanks Winston.

    Newfangled fancy tractors! All I know is the old simple ones. But I do look enviously at the modern ones once in a while.....

    Actually it makes sense that they combined the drop rate function into that stop valve since the purpose of both valves is to choke the fluid return line.
    Sure, mine is one of the newer 1982-83 2002D models.

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