Old loader, arms only go up, not down

I don't know all the details. I stopped by one day (40 miles away), and had about 5 minutes to look at it, and I was in my "good" clothes.

My uncle bought an 8n with a loader. He got it home, and replaced a couple hoses, one at a time he said (he's not a farmer/rancher, lives in the village). He raised the loader, and that's it, won't go down. I looked it over when I was there, I don't see anything obvious externally. The hoses go to Ts/couplers to split between the two cylinders. Unless I'm missing something simple, it looks plumbed right. Bucket works correctly, two way cylinder, arms, one way. Best of my recollection is the attached rough drawing. I've not... had this issue myself.

Is there possibly a back/down pressure adjustment that's off? Maybe under the cap? Otherwise I was thinking a blockage, or somehow the cylinders are binding up?

I suggested propping up the bucket/arms carefully and loosening the pressured hose to see if it was at the valve. I had all my weight on the bucket, it did not budge in the slightest. Moving the control, you can see the hose when it's getting a bit more pressure, but it doesn't seem to lose that much when the lever is moved the other way, but it does seem to lose some, hose is very stiff so it's hard to tell without loosening it....

He's not getting to it, and has mentioned having someone work on it. I really don't have time to head back over there to work on it during haying. Just wondering if I missed something obvious, or other suggestions. Thanks.

You say the loader lift cylinders are one way, but you show two hydraulic hoses to them?

That is odd, doesn’t seem right to me.

Paul

Does he have quick connectors? Sometimes they hang up. Worst can scene is if he use elbows that were wrapped in plastic the plastic is jammed in the opening not letting the fluid back. Your diagram
shows one way lift and two bucket control to me if the bucket works normal it is only in the lines to the lift.

it goes back to the tank. I think it may be mechanical rather than a hydraulic problem

Surely with single acting rams, when the lever is moved to the down position to depressurize the ram, the oil flows back out of the ram the
way it came in, back through the same pipe and back to the tank from the other side of the actuating valve? Can't see how moving the lever on
a single acting ram can allow the oil to flow out another pipe -----? All rams I have seen with two pipes from them have been double acting -
something wrong there? Or am I misunderstanding something altogether? Jim

(quoted from post at 09:06:18 07/17/20) You say the loader lift cylinders are one way, but you show two hydraulic hoses to them?

That is odd, doesn t seem right to me.

Paul

Click to expand...

Drawing, there are two of each cylinder depicted. Top depicts bucket cylinders. Both hoses go to valve. Bucket cylinders, only the lift/extend side goes to the only connector on the valve. The other side is "open", to air, just a return line back to the top of the reservoir, assuming that's for any leakage, doesn't pull back any oil.

(quoted from post at 09:17:47 07/17/20) Does he have quick connectors? Sometimes they hang up. Worst can scene is if he use elbows that were wrapped in plastic the plastic is jammed in the opening not letting the fluid back. Your diagram
shows one way lift and two bucket control to me if the bucket works normal it is only in the lines to the lift.

Click to expand...

Not quick connectors. Yes, I just mentioned the bucket so for sure everything is right concerning that "side", hydraulics working, etc.

(quoted from post at 09:21:00 07/17/20) it goes back to the tank. I think it may be mechanical rather than a hydraulic problem

Click to expand...

I'm thinking that, bucket works strong. Main thing I didn't know if that type of valve had an adjustment for the "not power/release", like a flow control for the release, other than not pulling the lever all the way, if anyone understands what I'm saying.

We don't know what loader or valve it is. You do not show a return to the tank from the valve. Is there a hose for return from the valve? Or is it one of the loaders that the valve return is through its mount on the loader frame?

That's actually fairly common, then if there is any leakage past the piston the oil goes to the tank rather than blowing out a vent.

(quoted from post at 09:41:24 07/17/20) Surely with single acting rams, when the lever is moved to the down position to depressurize the ram, the oil flows back out of the ram the
way it came in, back through the same pipe and back to the tank from the other side of the actuating valve? Can't see how moving the lever on
a single acting ram can allow the oil to flow out another pipe -----? All rams I have seen with two pipes from them have been double acting -
something wrong there? Or am I misunderstanding something altogether? Jim

Click to expand...

Same line, yes, tried to explain in the drawing, and other post.

(quoted from post at 09:56:51 07/17/20) We don't know what loader or valve it is. You do not show a return to the tank from the valve. Is there a hose for return from the valve? Or is it one of the loaders that the valve return is through its mount on the loader frame?

Click to expand...

The return was missed, don't recall seeing it, since the bucket was working correctly I guess I assumed the valve plumbing itself was ok and just looked at the cylinder plumbing mostly. It was mounted very close to the tank, might have been mounted to it. And I didn't see an obvious name on the loader. Didn't look like any I've seen.

The side of the valve is set up roughly like the drawing, close, didn't know if it was common and ... easily recognized.... I've never had a one way valve myself. Should have taken a picture, I just assumed he'd work on it himself, didn't think about posting here, I should get back over there myself if I could. Hard to guess by just looking at it.

I enjoy puzzles and learning from stuff like this, so if you learn more or a solution please keep us updated. This is the kind of thing this place is for, I enjoy!

I’m kinda dumb on hydraulics and electrical stuff, so I tend to just read, not try to confuse things with my lack of knowledge.

I have a combine hyd issue myself going on, haven’t figured it out. I’ll have to dig the machine out soon and start puzzling on it, you all might get some questions from
me at that time.....

Paul

Did you figure this out? I have an Allis D17 with a loader, same set up as you describe. One hose to the loader, and a hose that connects the two loader arms - but no return. When I drop the loader the oil is supposed to flow back the way it came (single acting cylinder). But the loader goes up and stays up - it won't come back down.

Is this a loader that has been on this tractor and working properly before this, or is it a loader you just installed on the tractor and doesn't work properly?

It might help if you made a new post of your own and gave all the background. This site uses two different views. People using Modern view will see your post and the original post you are tagged onto, so they see the "back" story related to your post. People using the Classic view only see your post as "Re" to the original post, none of that original post since Classic does not bring old posts to the top like Modern does; they stay in the list where they were posted in time where your post shows as current. People can swap over to Modern to see the original post, but likely many will not bother to do that.

Thanks for your reply...I'll do that. It's a loader that was buried in the grass for a while in a tractor salvage yard. I installed the loader, replaced the hoses with new ones, and pushed the loader up (it was about half way up when I installed it and didn't come down all the way when I installed it without the hoses connected). I jacked it up in order to connect it in the first place. So I pushed it up once I connected the hoses (it jerked and stuck a bit and then went up) and now the cylinders are fully extended but gravity is not pushing it down. Should I put some oil/grease/bolt loosener on seal? thanks for any advice.