880 hydraulic problem

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Superpuma165
Posts: 3
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
Posts: 3692
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

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
Posts: 3
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
Posts: 3692
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

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: 3
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
Posts: 6
Joined: Wed May 01, 2019 11:43 pm
Location: Norway

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
Posts: 3692
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

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.

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