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  1. #1
    New Member
    Join Date
    Jun 2010
    Posts
    6
    Location
    Ireland, IN
    Tractor
    John Deere 3520

    Default 72d belly mower for 3520 drops

    Hello Everyone,
    I have had my new tractor back to the dealer two times and they keep telling me, John Deere says the hyd, cyl is to raise the deck and not hold it up and use the locking pin, John deere says in a service letter that if the deck bleeds off in under 7mins that something is wrong then, I think that it should hold it up for 8hrs at the min. The dealer timed it and it takes 25 mins. to bleed off. They did fix the 3pt from bleeding off and thats great, But I'm not very happy to spend all that money and the deck Bleeds off . Anyone else out there have a problem like this. Other then that I love the tractor and loader,

  2. #2
    Silver Member
    Join Date
    Oct 2004
    Posts
    112
    Location
    kingsville, maryland
    Tractor
    jd 3520 HST open station turf tires air seat jd 997 ztrak 72"

    Default Re: 72d belly mower for 3520 drops

    my 72d mower on my 3520 also bleeds off in 2 to 3 mins. the deck only uses one hyd line to the cyl. on my old 4410 with a 72" mmm it did not bleed off but it used two lines to the hyd cyl. ???????? beats me...........bud
    jd 3520 os HST-- turfs--air seat--72D mmm w/mulch kit--300CX fel--366 front snow blade--i match--ap12 forks--wr long obg2-56 grapple--ballast box w/extension-- 15KW pto generator--markham toothbar & grubbin bucket--larrys mower axels--ken's bucket hooks----jd 997 ztrak--72" w/mulch kit--suspension seat--rear bumper

  3. #3
    Veteran Member KB9UDE's Avatar
    Join Date
    Apr 2006
    Posts
    1,023
    Location
    North of Tower Hill, IL
    Tractor
    John Deere 3320

    Default Re: 72d belly mower for 3520 drops

    One way (single hyd line) cylinders are known for bleeding off over time. I have a hyd lift kit on my 2320's 62D drive over deck and it bleeds off so fast you can watch it go down like in 45 seconds...It did not make me happy but the dealer says there is nothing they can do.
    John






    John Deere 3320 - 72D Auto Connect deck



    Acts 2:38

  4. #4
    Super Member
    Join Date
    Dec 2003
    Posts
    5,546
    Location
    NC
    Tractor
    Kubota Grand L3830

    Default Re: 72d belly mower for 3520 drops

    Hydraulic cylinders without a pilot valve leak down. Adding a pilot valve would probably add 8-10 dollars to the cost of the valve. John Deere must feel the extra cost would prevent a sale.

  5. #5
    Elite Member
    Join Date
    Jul 2006
    Posts
    3,015
    Location
    midwest
    Tractor
    JD 4520, Toolcat 5610, Bobcat S300, Case-IH 125 Pro, Case-IH 245, IH 1086, IH 806

    Default Re: 72d belly mower for 3520 drops

    Quote Originally Posted by Gator6x4 View Post
    Hydraulic cylinders without a pilot valve leak down. Adding a pilot valve would probably add 8-10 dollars to the cost of the valve. John Deere must feel the extra cost would prevent a sale.
    It is a one way cylinder. Check valve won't work. As far as I know, it takes pressure from the other hose to create enough pressure to open the check valve.

  6. #6
    Elite Member
    Join Date
    Dec 2001
    Posts
    3,179

    Default Re: 72d belly mower for 3520 drops

    So we need a locking pin to keep it up? I have a 72" but I would imagine the 72d is heavier so it comes down in a lot less time than mine does. That is one of the next things I wanted to work on.
    Nuru
    JD 3520


  7. #7
    Gold Member
    Join Date
    Jun 2008
    Posts
    278
    Location
    Kentucky
    Tractor
    John Deere 3320 - gator cx

    Default Re: 72d belly mower for 3520 drops

    If you have the trird scv, why can't you put a regular cylinder on the mower deck to hydraulicly raise or lower? My 72" deck on my 3320 works that way. It stays up when raised.

  8. #8
    New Member
    Join Date
    Jun 2010
    Posts
    6
    Location
    Ireland, IN
    Tractor
    John Deere 3520

    Default Re: 72d belly mower for 3520 drops

    What I mean by locking pin is the deck height pin, if I got to get out of the seat to move it , Why just not flip the two levers and remove the gauge wheel pins and remove the deck all together, It has seem that i have anwersed my own ? . It is a Poor set up By Deere and one they need to fix. I work on coal mine equiment all day long. and if they had a cyl bleed off that quick we would have to fix it, Most of CAT spec of cyl drift is 1/4" in 3 mins. If the mower deck is so hevay that the cyl that on there won't hold it up put on a bigger cyl.. I love everything eles about the tractor but there about to get it back if they don't get fixed. Its not that i'm layz, Its that I spent $3500 on a mower deck that bleeds off My inlaws have a 445jd mower and the deck stays up on it and i dove it 4miles to my house before i got my 3520 to mow. I can't drive the 3520 back to the dealer 1 1/2 miles up the road with out the deck droping three times, thanks for everyones help

  9. #9
    Bronze Member
    Join Date
    Jun 2010
    Posts
    56
    Location
    West Virginia
    Tractor
    John Deere 3520 w/cab

    Default Re: 72d belly mower for 3520 drops

    Quote Originally Posted by jd670 View Post
    If you have the trird scv, why can't you put a regular cylinder on the mower deck to hydraulicly raise or lower? My 72" deck on my 3320 works that way. It stays up when raised.
    This sounds like what we need to look at for a solution. My 3520 uses one line off of the rear scv. Why not use the 3rd funct. ports that are closer to the deck cyl. anyhow rather than run a longer line all the way to the rear of the tractor This would make more sense IMO. Mine leaks down quickly also.

  10. #10
    Veteran Member sunnyside360's Avatar
    Join Date
    Aug 2006
    Posts
    1,382
    Location
    Central PA
    Tractor
    JD 3720 Cab, JD 4320, Kubota M110X Cab, Kubota ZD331-72, Kubota RTV-X1100C

    Default Re: 72d belly mower for 3520 drops

    Quote Originally Posted by jd670 View Post
    If you have the trird scv, why can't you put a regular cylinder on the mower deck to hydraulicly raise or lower? My 72" deck on my 3320 works that way. It stays up when raised.
    jd670, yours works like my 3 yr old 7 Iron 72" mmm on my 3720 cab tractor. It takes several hours to leak down. The cylinder which raises and lowers the deck has two lines to/from the rear scv -- not one line.

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