David brown 885 hydraulics

Discussion in 'Classic Machinery' started by huwralph, Sep 14, 2018.

  1. huwralph

    huwralph Member

    Location:
    Abergavenny
    Hello,

    I am trying to use a David brown 885 with a loader on.

    Oil is slightly low but is still visible in the sight glass.

    But we have no hydraulics, loader won’t move nor will the 3 point linkage. Have tried the three way valve in all positions with the position leaver all the way up and nothing it doesn’t even try.

    The three way valve leaver is connected and seems to be working.

    Anyone know where to start?

    Also asking what this turning knob does and what position you need it in to use the loader it seems to turn freely as if not connected to anything? IMG_0009.JPG
     
  2. Tractortech

    Tractortech Member

    Location:
    Cumbria
    Now Then..
    Have you just fitted the loader or altered anything??
    If no to the above, I think many years ago I came across a similar thing. There was a pipe inside the back of the tractor and it cracked off around some brazing.
     
  3. Tractortech

    Tractortech Member

    Location:
    Cumbria
    IMG-20180915-WA0001.jpg Now Then..
    How good is this... The tech manual was just where I expected it to be.
    Unfortunately, the pictures I took on my phone are too big to send..
     
    Last edited: Sep 15, 2018
  4. As your stood at the back of tractor
    To right there is a little plate with 2 screws in
    Take that off and pull the valves out clean them
    I mean clean them make sure they slide freely in and out wet n dry paper to smooth them up a bit helps.

    If that doesn't help try your filter and put some oil in

    The dial in your pic should in the middle for arm to work
    And I think! No certain but the 3 way should be 1 click from mudgaurd
    I'm not expert on these by any means there's a few here that I have to look after oil cleanliness is quite important
    Try the above and let us know
     
  5. huwralph

    huwralph Member

    Location:
    Abergavenny
    Thanks guys,

    I’ve had a look under the plate, but not dismantled anything. How do I go about taking them apart?
     
  6. Remove what ever is attached there should be 2 scews/bolts holding plate in.
    You need a to remove the slot cut bungs do one at a time, you need a pair of snap ring pliers to make it easy to pull the valves out
    Then strip down wash the out taking care don't loose the ball which lies inside
    Wet n dry sand the body then refit checking it slides freely

    Hope you kind of understand what I mean
     
    huwralph likes this.
  7. Andyt880

    Andyt880 Member

    The height/depth selector shown in your photo should only be moved when the lift lever is pulled back against the spring which is the constant pump position. You should hear the pump straining when you do this.
    If you are feeding your loader from the 3 way valve you should select external on this selector. You then need to have the 3 way valve in the correct position to allow oil to flow from either port one or two. (One is usually the tipping pipe from memory and two will be the port below it which is usually blanked off if no loader fitted).
    If you are feeding a spool block to control the loader (with a return back into the gear box) then you will need to fix the lift lever back into the constant pump position again to give a constant flow of oil to your loader spool block.
    If none of this is working and the lift isn’t working either then I would say you have a valve stuck in your valve chest (item c on the diagram @Tractortech added)
    The valve that usual sticks is the one under the dump valve. It sticks open and allows the oil to flow straight past the valve chest instead of going through to operate the valves. @REStracTORATION gives a good enough description above of how to clean these valves. And as he says be careful with the ball bearing in them. If the valve is stuck the ball usual comes out stuck in the seat on the inside of the top cover that has the slot in it.
    I’m no expert by the way, just speaking from experience of operating a few browns.
    @Selectamatic might have something to add
     
    huwralph and REStracTORATION like this.
  8. Netherfield

    Netherfield Member

    Location:
    West Yorkshire
    Although @REStracTORATION is correct, don't wet and dry unless the valve is sticking, one of the valves that lift out has a brass screw inside it, undo that and make sure everything is clean, there is a little disc with three minute holes in it that can get blocked, and also somewhere among all that there should be a little plastic filter which can block up with crud. It's 20+ years since I last did one , so I cant remember the order of the bits and pieces. On top of all that it's possible the hydraulic pump has destroyed the O ring which sits behind the pump, the hydraulic filter is blocked or the pump is chuffed.

    If you're on a Q cab model I can't remember what that lever connects to under the cab, but it's possible it's come adrift.

    Parts catalogue available here

    https://partstore.caseih.com/us/parts-search.html#epc::model_find
     
    Last edited: Sep 18, 2018
    huwralph and REStracTORATION like this.
  9. Selectamatic

    Selectamatic Member

    Location:
    North Wales
    Not really.

    The Selectamatic is a dead simple system to use, genuinely, it is!

    But when you write it all down it's akin to solving the internal workings of a woman's brain!

    Whatever you do to DB hydraulics, cleanliness wins every time, cleanliness down to the last detail!
     
    Boohoo, Yazzie, Exfarmer and 3 others like this.
  10. :ROFLMAO::ROFLMAO::ROFLMAO:
     
    huwralph likes this.
  11. Selectamatic

    Selectamatic Member

    Location:
    North Wales
    Dont laugh! It's true.

    By some margin, Selectamatic was the most accurate and versatile hydraulic system in it's day.

    By the 80's it was lagging behind, but in the 60's there was little to touch it.

    It's issue was dirt, it's tolerance to shitty oil, was next to nothing. A glug of dirty oil from an unknown trailer pipe was all it took to balls the job up.
     
    Exfarmer and Ray996 like this.
  12. Andyt880

    Andyt880 Member

    I would prefer the Selectamatic system to any other hydraulic system on a 60s or 70s tractor I have ever used. It wasn’t as complicated as a lot of people think
     
    Boohoo, Ray996 and Selectamatic like this.
  13. Selectamatic

    Selectamatic Member

    Location:
    North Wales
    It's not complicated, it's dead simple, it sounds horrendous, but it's pretty straightforward and very versatile!
     
    Boohoo, Exfarmer and Andyt880 like this.
  14. Ray996

    Ray996 Member

    Location:
    North Scotland
    Easier to operate than a ferg! Time to hide i think
     
    Boohoo and Andyt880 like this.
  15. Selectamatic

    Selectamatic Member

    Location:
    North Wales
    1d1k9q.jpg
     
    Andyt880 likes this.
  16. Andyt880

    Andyt880 Member

  17. Ray996

    Ray996 Member

    Location:
    North Scotland
    someone had to say it !post that hard hat up might need it.as already said keep it clean and you have no problems,change oil on my 996 regular ,take filter underneath of and scrub gauze and clean mesh filter under dump valve,old beast 42 year old and lift doesn't drop overnight and still lift full box of stone no bother,not many left that can still do that.
     
  18. I was laughing at your metaphor :LOL:
     
    Selectamatic likes this.
  19. huwralph

    huwralph Member

    Location:
    Abergavenny
    What oil would you use in her?

    Thanks for all the replies, not got round to looking yet.
     
  20. 15/40 utto will do her
     

Share This Page