880 hydraulic problem

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Superpuma165
Posts: 7
Joined: Sun Feb 03, 2019 8:19 pm
Location: Ayrshire

880 hydraulic problem

Post by Superpuma165 » Mon May 06, 2019 5:45 pm

Hi
I have recently got a DB 880 1966.
The hydraulics didn't work when it came. I have changed the hyd oil (milky) and filter .
Cleaned and polished the bypass valve and dump valve with brasso , both are free now.
The arms will lift when the selector is in the right position (external & TCU) and the lever is pushed forward. But nothing in height or depth settings .
Any idea what could be the problem ?
Last edited by Superpuma165 on Mon May 06, 2019 8:56 pm, edited 1 time in total.

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ollek
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Re: 880 hydraulic problem

Post by ollek » Mon May 06, 2019 6:51 pm

You are describing the Selecrtamatic hydraulic system, but the 880 Selectamatic was produced from 1965 to 1971. There is no Selectamatic tractors made in 1960. Your description shows that the TCU system is working as the pressure will rise when the lever is pushed forward with the selector in TCU position. Is sound like the spool valve is stuck in the up position. There is two nuts on top of the spool valve and a washer below the nuts. The washer has to tight on the valve chest body when the main control lever is fully back in the quadrant.
Very important!! DO NOT touch the nuts as you then will have to adjust the movement of the spool valve if you undo the nuts. The adjustment can only be made using special tools and with the valve chest removed from the tractor.

Superpuma165
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Joined: Sun Feb 03, 2019 8:19 pm
Location: Ayrshire

Re: 880 hydraulic problem

Post by Superpuma165 » Mon May 06, 2019 9:03 pm

Sorry it's a 1966 selectamatic.
My mistake
is there anything I can do without removing the spool valve?

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ollek
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Re: 880 hydraulic problem

Post by ollek » Tue May 07, 2019 5:32 am

Check that the washer is tight on the valve chest body when the control lever is fully back, and if not, carefully pry or knock the valve down. Milky oil is a result of water getting mixed into the oil. Water will make hydraulic valves rust and size and in the end the valves will become completely stuck and in some cases damaged to the degree that the valve plungers will no longer seal in the borings. Because of this, you can have to remove the valve chest if some of the valves have seized, as not all valves can be reached with the valve chest in place. The only valves you can clean are the by-pass and hold valves. You can also get to the top of the spool valve and try to make the spool moving by moving the spool up and down mechanically from the outside using a small pry bar or a screw driver. The following link to a page from the parts catalö0ogue shows all valves you can find in the valve chest https://partstore.caseih.com/us/parts-s ... 85ar297525 And by the way, the dump valve sits on top of the hold valve and is hand operated via a stud sticking up from the rear axle. This valve is not fitted to all tractors and it only, when used, makes the linkage lowering faster in cold weather. A faulty (leaking) dump valve has nothing to do with the lifting, but will result in a leak down of the lower links when the engine is shut off. A leak hare will also lead to "hick up" of the lower links, that is a constant lift and lowering when the engine is running and the selector is in middle position (height control).

Superpuma165
Posts: 7
Joined: Sun Feb 03, 2019 8:19 pm
Location: Ayrshire

Re: 880 hydraulic problem

Post by Superpuma165 » Tue May 07, 2019 9:42 pm

Thanks for your help.
I will let you know how I get on.

byronFriek
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880 hydraulic problem

Post by byronFriek » Wed May 15, 2019 1:02 am

the hydraulic rear trunk lid works well up and down, but it doesnt lock anymore when closed.
it seems the soft close metal hook in the lid to close the lid doesnt work anymore.
so i have to drive around with an unlocked rear trunk lid.
waht could cause the problem ? cable in the trunk lid or machanism ? any other idea ?

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ollek
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Re: 880 hydraulic problem

Post by ollek » Wed May 15, 2019 4:29 am

byronFriek, do not use other individuals postings for your problem. You must open a new topic for your problem. And then, I can not understand what you mean when you say "hydraulic rear trunk lid works well up and down, but it doesnt lock anymore when closed". Please open a new topic and attach a picture showing the problem area. Can you also try to explain your problem in a better way as the complete explanation you have been given, does not really make any sense. The whole text looks to be a so called "Google translation", and this will never work with technical texts.

Superpuma165
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Joined: Sun Feb 03, 2019 8:19 pm
Location: Ayrshire

Re: 880 hydraulic problem

Post by Superpuma165 » Wed Jun 05, 2019 10:10 pm

Hi ollek
Finally got back to the 880 at the weekend
We located the 2 nuts on top of the spool valve and they were slack !!!! Somebody been there before us I think !!!
So anyway it was stuck fast ... So out came the control valve and we got the spool valve freed off .
We decided to clean all the valves but the non return valve and the rate of lowering valves are stuck
We have left it in a tub of diesel .... Is there anything else we can do to free them ?

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ollek
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Re: 880 hydraulic problem

Post by ollek » Thu Jun 06, 2019 8:04 am

It can be difficult to free the valves if they are really stuck. Please remember to do all adjustments correctly and in the correct order when you put everything back together. And be precise, all measurements and adjustments must be absolutely correct, or the system will not work. The following is a link the settings you have to make. http://dbtc.co.uk/index.php/information ... lic-system

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cobbadog
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Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: 880 hydraulic problem

Post by cobbadog » Thu Jun 06, 2019 8:19 am

Auto transmission fluid and accetone mixed 50/50 is a good penetrator for freeing things up.

Molassis and water is another.

Superpuma165
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Joined: Sun Feb 03, 2019 8:19 pm
Location: Ayrshire

Re: 880 hydraulic problem

Post by Superpuma165 » Sun Aug 18, 2019 8:44 pm

UPDATE
We have cleaned all the valves on the control valve and they are all moving freely now .
We did all the adjustments with the dial gauge and special tool
We refitted the control valve to the tractor and when the tractor is started the arms lift straight away and don’t lower until the engine is switched off
When we removed the cover on the right hand side of the tractor the height control rod roller was broken we repaired it but it’s not perfect could this have anything to do with it lifting when it’s started ?

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ollek
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Re: 880 hydraulic problem

Post by ollek » Mon Aug 19, 2019 12:02 pm

What was the figure written on the flat bottom face of the spool valve and to what movement did you set the spool valve? Is the spool valve moving up about 2,5 mm when you move the control lever from full lift to full lower? Was the hole in the small restrictor in the by-pass valve untouched and not enlarged and is the brass plug tightened correctly? The hole diameter in the restrictor should be around 0,7 to 0,8 mm.

Superpuma165
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Location: Ayrshire

Re: 880 hydraulic problem

Post by Superpuma165 » Mon Aug 19, 2019 6:38 pm

99 was the number stamped on the bottom of the spool valve we set it to 100!
The spool valve is moving when we move the control lever
From memory the hole in the restrictor was untouched but we will check it later.
Do you think this is a problem in the control valve ?

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ollek
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Re: 880 hydraulic problem

Post by ollek » Tue Aug 20, 2019 5:31 am

What is the pressure in the lift cylinder when the hitch is at full lift height and the engine is running? If the pressure is 50 bar or a little less, then the TCU valve adjustment is wrong. If the pressure is the full pressure (around 150 bar) then it is possible that the latching valve is stuck or the plunger is turned the wrong way around. There is also a possibility that the ball in the TCU valve is stuck against the seat.

Superpuma165
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Joined: Sun Feb 03, 2019 8:19 pm
Location: Ayrshire

Re: 880 hydraulic problem

Post by Superpuma165 » Sun Sep 15, 2019 9:31 pm

Update
Finally got the hydraulic lift working properly today
It was the sleeve that the latching valve slides into that had moved. The snap ring had come off the top off the sleeve and it had moved down. Got it pulled out and stuck it in the correct position with loctite .
Refitted the control valve to tractor and it works correctly.
Thank you ollek for your assistance 👍

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