Db990 Lift arms wont suddently move

Netherfield · Apr 7, 2024

Now I would be putting a pressure gauge on the camels hump, just to check what pressure the pump is delivering, chances are the hydraulic pump has blown the O ring off the spigot it sits on, you could be hearing oil escaping behind the pump.
At tick over if you pull the lever fully rearwards does it drop the engine revs any, a good pump could drop them 50 rpm or so.

The other problem you have is not uncommon, I could marvel at how someone had managed to tighten it so much, our local dealers made a tool to bolt on the top holding a screwdriver bit which fitted on the socket set forcing it well in to the slot.

Exfarmer · Apr 7, 2024

I have know the pipe carrying the pressure feed into the camels hump fracture immediately below, it left just enough flow to lift the linkage very slowly but any weight on top pushed them back down

JacobJ · Apr 7, 2024

Okay now an update. Got the cap off after some serious talk with it..

Cleaned it out (it wasnt dirty at all, but there was a bit off dirt in the small filter in the buttom of the valve), and startet it, and the lift did work as it should. I tried the dump valve, but it didnt dropped the linkage as I would expect. I thought it would just drop them fast? The lift lowered very slow, so I tried to adjust it on the lowering control nub, but then it suddently didnt work again. Turning the nub back again didnt work. Tried to disassemble it all again and cleaned it again, but it doesnt work.

Is it possible that the fault is related to the lowering control valve?

Bald n Grumpy · Apr 7, 2024

JacobJ said:
Okay now an update. Got the cap off after some serious talk with it..

Cleaned it out (it wasnt dirty at all, but there was a bit off dirt in the small filter in the buttom of the valve), and startet it, and the lift did work as it should. I tried the dump valve, but it didnt dropped the linkage as I would expect. I thought it would just drop them fast? The lift lowered very slow, so I tried to adjust it on the lowering control nub, but then it suddently didnt work again. Turning the nub back again didnt work. Tried to disassemble it all again and cleaned it again, but it doesnt work.

Is it possible that the fault is related to the lowering control valve?

First of you wouldn't see if that valve was dirty it's such a small hole that your hydraulics have stopped before you could see anything ,
You mentioned previously that your oil was "whitish" . That's water in it and probably most of your problem, change the oil and the filter and clean the valve again, and possibly again until the problem stops.
I personally wouldn't touch anything else until you've done this.
It's a very common problem hence the mangled screw plug as when it happens away from home you usually manage to fix it with whatever you can find in the tractor toolbox which isn't always ideal.

Alchad · Apr 8, 2024

Bald n Grumpy said:
You mentioned previously that your oil was "whitish" . That's water in it and probably most of your problem, change the oil and the filter and clean the valve again, and possibly again until the problem stops.
I personally wouldn't touch anything else until you've done this.

Absolutely

JacobJ · Apr 9, 2024

Have now ordered a new filter and gasket for the hydraulics. But I can't seem to find any info on, what type of transmission oil I have to get. 23 liters seems to be the volume, but the grade the oil has to have I can't find. Would and iso 32 or 46 work? What would be best? David brown et19/et33 ive found, which is also an iso 46 oil I have found. Would that be suitable?

Exfarmer · Apr 9, 2024

JacobJ said:
Have now ordered a new filter and gasket for the hydraulics. But I can't seem to find any info on, what type of transmission oil I have to get. 23 liters seems to be the volume, but the grade the oil has to have I can't find. Would and iso 32 or 46 work? What would be best? David brown et19/et33 ive found, which is also an iso 46 oil I have found. Would that be suitable?

Definitely not any of those, should be a UTO or SUTO ,

JacobJ · Apr 9, 2024

Exfarmer said:
Definitely not any of those, should be a UTO or SUTO ,

Is that sold by any other definition? Can't find any hydraulic oils on Google here in Denmark with uto or suto in the name/specs..?

Alchad · Apr 9, 2024

This is what I use in my 1390

Smith & Allan Super Tractor Universal Oil 15W-30 - STOU

www.smithandallan.com

JacobJ · Apr 9, 2024

Arh okay, so it is STOU and not suto? Don't know what it stands for, but that I remember I have seen.

Alchad · Apr 9, 2024

Didn’t realise you were in Denmark

Try Googling this

STOU 15W-30 Universal Farm Oil

JacobJ · Apr 9, 2024

Does it have to be 15w-30? Is 10w-30 to fluid?

Mur Huwcun · Apr 9, 2024

JacobJ said:
Does it have to be 15w-30? Is 10w-30 to fluid?

Either will do in a DB

Bald n Grumpy · Apr 9, 2024

SUTO super universal tractor oil. It's not hydraulic oil and never put hydraulic oil in a DB backend but 10w 30 SUTO is ok for the engine and backend.
Used to be able to get universal tractor oil but haven't been able to for a long time here in UK

JacobJ · Apr 10, 2024

Mur Huwcun said:
Either will do in a DB

Super. Ive found 10w-30 stou, so that it will be then. Thanks for the help.

Alchad · Apr 10, 2024

Bald n Grumpy said:
SUTO super universal tractor oil. It's not hydraulic oil and never put hydraulic oil in a DB backend but 10w 30 SUTO is ok for the engine and backend.
Used to be able to get universal tractor oil but haven't been able to for a long time here in UK

Smith and Allen do it - see link above, also Morris Lubricants

Agrimax Super Farm 10W-30 Universal Tractor Oil

Morris Lubricants Agrimax Super Farm Universal 10W-30 offers versatility, performance and grade rationalisation opportunities in one product formulation.

www.morrislubricantsonline.co.uk

They also do 15-30, price seems very steep online, sure my local agricultural dealer is cheaper although last two lots I’ve bought have been Smith & Allen (good virtually next day service BTW)

Bald n Grumpy · Apr 10, 2024

Alchad said:
Smith and Allen do it - see link above, also Morris Lubricants

Agrimax Super Farm 10W-30 Universal Tractor Oil

Morris Lubricants Agrimax Super Farm Universal 10W-30 offers versatility, performance and grade rationalisation opportunities in one product formulation.

www.morrislubricantsonline.co.uk

They also do 15-30, price seems very steep online, sure my local agricultural dealer is cheaper although last two lots I’ve bought have been Smith & Allen (good virtually next day service BTW)

Thanks
I buy a barrel of a local companies own brand SUTO when I need to, iirc correctly and I expect to be corrected if I'm wrong but isn't the only difference between UTO and SUTO is an additive in the SUTO for tractors with wet brakes ?????

JacobJ · Apr 14, 2024

Gasket, filter and oil was put in today and now it works. The oil was dirty and there was some water in it. Filter was very dirty. Cleaned it all, and now it is working. Don't know how it can be, that that was the cause. It must be very sensitive as you also mentioned.

Thanks for all your help. Now its back to the cooling problem..

Db990 Lift arms wont suddently move

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