JD400 Cessna Loader Valve
Results 1 to 9 of 9
Like Tree1Likes
  • 1 Post By Chilliwack Murray

Thread: JD400 Cessna Loader Valve

  1. Top | #1

    Join Date
    Aug 2017
    Last Online
    Today @ 01:14 AM
    Location
    Chilliwack BC, Canada
    Posts
    12
    Thanks
    1
    Thanked 1 Time in 1 Post

    JD400 Cessna Loader Valve

    Iíve had a 1969 400 with the 7400 loader for a couple years and recently pulled the loader valve apart to reseal it and the pressure relief valve on the inlet port came came out in pieces. The brass insert in the spool was unthreaded and sitting sideways.

    It seemed apparent how it should go back together, I got my thread file out and cleaned up the brass insert so it would thread all the way down, inserted the orfice and spring (there was no shim at the bottom of the port) and put it back on the machine.

    The loader operates extremely slow however it has full lifting capacity so it seems like the pressure relief is assembled wrong but I donít see another way to assemble it. Does anyone have any info on these old valves? The JD parts manual seems to agree with my assembly but itís not a very good drawing.

    The backhoe works normally so I know the pump is fine.


  2. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  3. Top | #2

    Join Date
    Oct 2014
    Last Online
    Yesterday @ 04:48 PM
    Location
    Coyote Flats,Texas
    Posts
    1,606
    Thanks
    15
    Thanked 272 Times in 244 Posts
    Welcome to GTT
    Have you considered viewing the parts schematics on JD Parts on line? Do I have correct portion of valve you referred to in photo?
    Attached Thumbnails Attached Thumbnails Capture.PNG

  4. Top | #3
    Zebrafive's Avatar
    Join Date
    Apr 2012
    Last Online
    Yesterday @ 10:54 PM
    Location
    South West Michigan
    Posts
    6,942
    Thanks
    1,485
    Thanked 574 Times in 504 Posts
    Quote Originally Posted by Tx Jim View Post
    Welcome to GTT
    Have you considered viewing the parts schematics on JD Parts on line? Do I have correct portion of valve you referred to in photo?
    I think you have the correct drawing TxJim.

    Chilliwack, that is a flow control valve, not a relief valve. Later serial numbers only had a plug.
    J
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader
    John Deere 285 50" deck Stolen May 2017
    John Deere x485 62" deck AWS
    Kawasaki Mule 2510 4x4 bought new 1996
    Ford F250 4x4 bought new 1978

  5. The Following User Says Thank You to Zebrafive For This Useful Post:

    Chilliwack Murray†(05-14-2019)

  6. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  7. Top | #4

    Join Date
    Aug 2017
    Last Online
    Today @ 01:14 AM
    Location
    Chilliwack BC, Canada
    Posts
    12
    Thanks
    1
    Thanked 1 Time in 1 Post

    JD400 Cessna Loader Valve

    Thanks, that is the drawing I was using. It seems the spool can only go in one way as the orfice plate seems to need to seat on a surface above the brass insert and the spring on top of that.

    The only thing I see a little unusual is the orfice plate is dished so I reinstalled the way the wear marks indicated and there was no shim at the bottom of the bore. The second time around I tried a .030 shim as well with no change. I canít see the direction of the dish should make this significant a difference to the function.

    Flow control as opposed to pressure relief makes sense with the symptoms. I have full pressure eventually, just very little flow. If later models didnít have this, can it be left out or modified to stay in the full flow position?

    Thanks for the welcome by the way, I poured over everything 400 I could find on this site when I got the machine and really appreciated the info from TxJim and others to figure out the closed center system and find the additional filter. Iíve been lurking a couple years now so I donít feel that new.
    Last edited by Chilliwack Murray; 02-07-2019 at 09:47 AM.

  8. Top | #5

    Join Date
    Dec 2015
    Last Online
    Yesterday @ 04:50 AM
    Location
    North Carolina
    Posts
    1,252
    Thanks
    71
    Thanked 172 Times in 159 Posts
    Quote Originally Posted by Chilliwack Murray View Post
    Thanks, that is the drawing I was using. It seems the spool can only go in one way as the orfice plate seems to need to seat on a surface above the brass insert and the spring on top of that.

    The only thing I see a little unusual is the orfice plate is dished so I reinstalled the way the wear marks indicated and there was no shim at the bottom of the bore. The second time around I tried a .030 shim as well with no change. I canít see the direction of the dish should make this significant a difference to the function.

    Flow control as opposed to pressure relief makes sense with the symptoms. I have full pressure eventually, just very little flow. If later models didnít have this, can it be left out or modified to stay in the full flow position?

    Thanks for the welcome by the way, I poured over everything 400 I could find on this site when I got the machine and really appreciated the info from TxJim and others to figure out the closed center system and find the additional filter. Iíve been lurking a couple years now so I donít feel that new.
    Cessna is still around, maybe they might have some further information.
    3025e, D160 loader, Artillian Grapple, Forks, Hoe Bucket, Frontier Land Plane, Rotomec PDH300, Redline Systems 54 inch rock bucket, Heavy Hitch
    400 Garden Tractor, 35a Tiller, 54 inch plow, 60 inch deck

  9. Top | #6

    Join Date
    Aug 2017
    Last Online
    Today @ 01:14 AM
    Location
    Chilliwack BC, Canada
    Posts
    12
    Thanks
    1
    Thanked 1 Time in 1 Post
    From what I could gather from the hydraulic places around here, Eaton took over Cessna hydraulic motors but the valve division is defunct.

    I will pull the spool out on the weekend and get a look at the port locations to try to get a better idea of how the valve is supposed to work. Maybe it will either become more obvious or I will be able to run it without the spool.

  10. Top | #7
    Zebrafive's Avatar
    Join Date
    Apr 2012
    Last Online
    Yesterday @ 10:54 PM
    Location
    South West Michigan
    Posts
    6,942
    Thanks
    1,485
    Thanked 574 Times in 504 Posts
    The "block" that has the flow control is P/N AU40989. The block with only a plug is P/N U15577
    So there may be internal differences
    J
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader
    John Deere 285 50" deck Stolen May 2017
    John Deere x485 62" deck AWS
    Kawasaki Mule 2510 4x4 bought new 1996
    Ford F250 4x4 bought new 1978

  11. Top | #8

    Join Date
    Dec 2015
    Last Online
    Yesterday @ 04:50 AM
    Location
    North Carolina
    Posts
    1,252
    Thanks
    71
    Thanked 172 Times in 159 Posts
    Quote Originally Posted by Chilliwack Murray View Post
    From what I could gather from the hydraulic places around here, Eaton took over Cessna hydraulic motors but the valve division is defunct.

    I will pull the spool out on the weekend and get a look at the port locations to try to get a better idea of how the valve is supposed to work. Maybe it will either become more obvious or I will be able to run it without the spool.
    Well bummer. Good luck with the discovery learning technique. Sometimes just taking something apart and reassembling will fix it.
    3025e, D160 loader, Artillian Grapple, Forks, Hoe Bucket, Frontier Land Plane, Rotomec PDH300, Redline Systems 54 inch rock bucket, Heavy Hitch
    400 Garden Tractor, 35a Tiller, 54 inch plow, 60 inch deck

  12. Top | #9

    Join Date
    Aug 2017
    Last Online
    Today @ 01:14 AM
    Location
    Chilliwack BC, Canada
    Posts
    12
    Thanks
    1
    Thanked 1 Time in 1 Post

    JD400 Cessna Loader Valve

    Well, been cold and snowy for the past couple weeks here and not going to attempt to take the 15,000 sled down the snow covered driveway to the shop.



    Sun came out today so dropped the valve assy far enough to get the flow limiter apart and see how it should work. What I see is the brass orifice inside the spool provides a path from the main supply to the valve stack supply passage.




    More flow through the brass orifice would cause more pressure on the orifice until it blocks off the supply port. I know I took it apart the same way I assembled it but the brass orifice was laying loose and the threads damaged so Iím pretty sure the spool shouldíve been in the other way round so pressure isnít pushing against the open end of the threads. This would also increase the static compression of the spring from about 1/4Ē to 3/4Ē.




    I assume this is to protect power steering supply while using the loader but I donít drive this thing at any speed, and the newer block doesnít have this so I put it back together without the pieces and the loader is back to full speed. Iíll keeps the parts around in case it causes issues in the summer heat when pressures are lower.

    Thanks again to everyone who helped , realizing it was a flow limiter helped me figure it out and maybe someone else googling 400 slow loader will stumble across this.
    Last edited by Chilliwack Murray; 02-16-2019 at 07:20 PM.
    Zebrafive likes this.

  13. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

Similar Threads

  1. John Deere 855 loader valve and hydraulics
    By Skidoojunky in forum Large Frame Compact Utility Tractors (LCUT)
    Replies: 10
    Last Post: 12-05-2018, 02:24 PM
  2. Need help finding tri-rib tires for my jd400
    By dbtechnicalserv in forum Vintage Lawn & Garden Tractors
    Replies: 5
    Last Post: 01-05-2016, 06:51 PM
  3. Cessna 150L
    By jasonkendall in forum For Sale
    Replies: 13
    Last Post: 04-03-2015, 06:49 AM
  4. 3rd function loader valve for 1-series
    By Green Man in forum Sub Compact Utility Tractors (SCUT)
    Replies: 20
    Last Post: 10-10-2014, 10:18 AM
  5. 3rd function valve on 3038e JD with 305 loader
    By rick causey in forum Hydraulics
    Replies: 20
    Last Post: 12-16-2011, 01:20 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts