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Explained Hydraulics Please.....Newbie

Posted: Wed Feb 08, 2012 7:28 pm
by jimbobjames125
I have a david brown 885, we run a small sheep farm. I am unsure about the hydraulics on the tractor, to the left of the seat there is the output selector? Which positions do what? to the right of the seat is obviously the up and down! and there is a 3 point selector, depth, height, tcu/external, what does what?
Mainly i ask this because i have a tipping trialer comming and not a clue as to how to tip her, also, im using a tractor box to level some ground, at the moment all its doing is lifting the tractor box up as i reverse, how do you make te hydraulics 'stiff' ? please me, ! cheer James :oops:

RE: Explained Hydraulics Please.....Newbie

Posted: Wed Feb 08, 2012 7:56 pm
by colin6224
Hi James
On the left is the 3-Way output selector which has four positions from left to right.
1. Output 1 - Usually tipper outlet for cart.
2. Output 2 - Usually available for loader.
3. Lift Arms
4. Output 1 / Lift arms together (ie whichever operates mostl easily)

On the right is the Up and down lever, the lift handle. Basically pull the lever back (against the top spring in necessary) to tip a cart and push forward to lower.

The 3 point selection can generally be left in the middle Hieght position although some prefer to change positions depending on task. To shift the selector push lift handle (up down lever) fully back against the spring and then move selector tp required position.
From now on the lift handle will move the lift arms up or down if lift arms are selected by 3 way valve. If tipper outlet is selected the cart will tip when the lift handle is up and lower when the lift handle is down.
As for leveling ground etc. The hydraulics can raise the lift arms but only gravity lowers them. They are never forced down. If you want to use the tractor box to level ground you will need to add weight to the box.

Best adivice is to buy a tractor operators manual from the club shop. These contain all the operation and service information that you will need to maintain your tractor and are well worth having.

Colin

RE: Explained Hydraulics Please.....Newbie

Posted: Wed Feb 08, 2012 8:05 pm
by jimbobjames125
Thanks so much? I understand now,! What do the 3 positions actually do? Tcu etc? as for keeping the arms stiff, on fords you can make the arms stiff, so they dont lift up unless the lever is pulled, ?

Posted: Wed Feb 08, 2012 8:14 pm
by Scooby

RE: Explained Hydraulics Please.....Newbie

Posted: Wed Feb 08, 2012 8:24 pm
by colin6224
Hieght position sets the height for the arms. Usually used with things like transport boxes, buck rakes and anything that isn't in the ground.
Draft is designed for implements pulled through the ground. There is a sensing link on the top link attachment point which reacts to the load, ie how hard the ground is. The lift arms are then lifted or lowered to even out the load. A cultivator would lift out of the ground if the ground was harder and drop further in with soft ground.
TCU is described in the operators manual as being for "Implements with depth wheel ( gauge wheel)" I think the idea is that with a towed plough you can try to lift the plough just enough to give the tractor extra grip by moving the lift arm forward (its marked on quadrant scale). More commonly it is used for external tipper functions where lift handle fully back is to tip, a bit forward will hold while further forward will let it fall. When you get your cart try it. You won't break anything unless you really try.
As I said for most of the time it can remain in height.
I have never heard of a way to make the arms go stiff but it has never been a problem. Most cultivating implements will pull themselves down and a scraper or leveller usually has enough wieght to do the job.

Colin

RE: Explained Hydraulics Please.....Newbie

Posted: Thu Feb 09, 2012 5:13 pm
by jimbobjames125
Thanks so much people :-D its all understood now.... Cheers

RE: Explained Hydraulics Please.....Newbie

Posted: Fri Feb 10, 2012 6:51 am
by tdickson
As an after thought... has anyone recorded a video of the proper usage of DB hydraulics? Using different implements like: plough, cultivator, FEL, jib, tipping trailer, log splitter, etc. Could be a handy campanion for the 'Service Day' DVD. A picture tells a thousands words...but a movie tells the story.

TD

RE: Explained Hydraulics Please.....Newbie

Posted: Fri Feb 10, 2012 8:25 am
by tdickson
Ok... just had a closer look at the DTBC DVDs in the shop. Is it Vol #2 that includes "switch to selectamatic' archive footage?