Dexta hyd question

I would like to know how much pressure I should get at my auxiliary output with the 3 pt lever past the stop position. Is it the same as a super dexta around 2200 psi (just got this from an old archive from Brian). And also I have difficulty to get my front loader working some time I have to bring the 3 pt lever to the hupper position a couple of time and or play with my auxiliary transfert switch to get my front bucket working(not sure which one does the trick). I notice that there was a lock nut for holding the 3 pt lever is that an adjustment?? could that be the answer to my small problem.

thanks in advance
Jack.C

To get the lift to work correctly with a loader, the lift arms must be locked slightly down from the maximum lift height. Usually about 13mm. This is because there is a "knock off" pin in the lift to prevent the lift constantly lifting.

When you lower the lift slightly, this clears the pin and by pulling out the auxillary service control, the oil from the control valve is diverted to your loader.

If the loader works under load and the pressure in the system is high, then a slight leak from the auxillary service valve causes oil to flow to the ram cylinder and over a period of time, causes the lift arms to raise and the "knock off" pin cuts off the oil supply.

The answer to your problem is to lock the lift arms slightly down. Grey Ferguson's had bars that ran from the ends of the lift arms to a solid pin just below the 3rd link piviot. The arms must NOT be connected to the 3rd link position.

Always use your loader, or anything else that you use on the auxillary service port, in Draft (Qualitrol). If you use Position Control, if the lift arms sink, the lift will try and bring them up. As you are diverting the oil to the outside systems via the aux. ser. port, the loader/trailer etc. will start to raise. If you try to lower it you will find that you have no control at all.
regards
Brian

On a Dexta the pressure when initially cranked and running at 1550 rpms should be 2100-2300 PSI, the pressure relief valve will open and the pressure will drop to 600 PSI.

After the pressure relief valve has opened you should have a constant pressure of 600PSI at this port.

On the Dexta and Super Dexta both here is the only way I've found to operate the auxillary line.

Pull the diverter lever on the auxillary control valve all the way out to it's outter position, raise the 3 point lift lever to it's highest position.

The 3 point lever and the aux lever both have to be in the fully engaged position for the pressure to be diverted through the auxillary port.

If it's still slow to operate or does'nt prime up right away, your screen on the pump is dirty or your diff is low on oil.

You'r Always here to help my friend ! I don't know if this will help to resolve my problem but
sometime it seem's that when it doesn't engage like that, I just have to hit the 3 point lever to have the front loader going, I don't know how to explain this but when I have the auxiliary tranfert switch fully out and the 3 point lever at the highest (it can't go farther than that until I would cut the lever guide) position the loader doesn't work until I knock the lever with my hand like I want to go farther than the physical stop, but once it is engage the front loader if perfect (not tho slow)

The reason you have to do the extra jiggle is this.

At the far end of the linkage under the differential cover there is a spring and an adjustment nut on the linkage rod end.

Over time and through normal wear the spring either becomes weak or the end of the linkage wears down and lets the linkage slip when it should be pushing the internal valve control.

On my Super Dexta I sometimes have to let the 3 point control back about 2" then take it back to the top for 2-3 times before it will completely load the valve.

If you don't mind the agravation there is nothing that this will hurt.

You have to take the differential top off and adjust the linkage, and it's not too hard to do, but it's easier for me to run mine like it is.

If you decide to fix yours I will get the books out and tell you the torques and length of the linkage when you need to know.

I like to help someone like you who is excited and energetic to get it working right.

There are too many people who ask for info and never even try to work on their tractor, they just take it to a shop anyways.

I would email you a copy of the book but it has gotten old and yellow. When you try to scan or photocopy it the pages all look black or dark brown and you can't see anything.

I guest I will fix the principal part like the fuel pump (found one for $45 just for the membrane) for now and change all the lubricant because I don't know since when it is there and if the old owner was doing all the normal maintenance .Then if I got the time before the snow I will probably do it. But for now it is not to bad like it is and you just gave me the confirmation that it won't hurt this beauty.

Thanks for the tought of the scanning, but I will definitly buy the i&t book. For now I am shopping for it because the lowest price I have found so far is around $55 dollars canadian shipping and handling included.And this is from the link that you gave me.

P.S: As soon as I got time I will send you the picture of my beauty by email (have to borrow a digital camera first)

Regards
Jack.C

Maybe I can purchase them here and ship them to you to save some money.

I don't see where it's worth and additional $25 for them to ship to Canada.

When my wife sends a package to our nephew in Toronto it does'nt cost anymore than when we send a package to Georgia. This makes me curious so I'll check it out.

Brian is 100% right about the system, I just was trying to explain the quickest and easiest way I have found for me to do.

I use my Dexta just about everyday. Bushhog, pto driven pumps and generaters, or sometimes I just let the grandbabies drive it to hay ride or go fishing.

The tractor has to work if it stays at my house, but we have to use it for fun too.

I just won the ebay bid for a manual so it is close to the price of a new one but I still saved about $10 canadian.I just hope that it is a good manual it is i&t fo-18

Regards
Jack.C

très bon français!my problem appear only when I whant to go from the lift arm to the front loader but once it is working it is fine until I
have to work with the back blade and then come back to the front loader. I Dont know if I got your explaination wright but it seems buy the way I understand it that you are talking about a problem that would occure during the use of the front loader which is not the case here but maybe I didn't translate your explanation correctly in my head (I am not fully bilingual).But while I got you Thanks for all the posted you did so far I learned a lots and I am sure I am not the only one .

regards
Jack.c

Thank for your time brian it is very appreciated and know you and burrhead are the best mecanic that we have on this site (I've read about all 6 pages of this forum + the archived one)

P.S : be patient I will surly understand your explanation one day this year or next year.

Regards
Jack.C