LA650 curl cylinder will only go one way (down)

[Vagabond]

At the same time as I noticed my control valve leaking: https://www.orangetractortalks.com/forums/threads/la650-control-valve-leaking.73021/ I also lost control of the curl cylinder. At first I thought this was simply because of low fluid, but I've since cleaned the sealing surfaces and replaced an o-ring (while I wait for the seal kits) and the leak is mostly gone now.

However, the bucket refuses to curl. When I try I can hear the engine bog down and the relief valve open. I unhooked the line at the control valve to the top of the curl cylinders, and the bucket lifted fine (spraying fluid out of the unhooked hose). I reconnected the hose and the bucket was able to go back down, but when I tried to curl the bucket again, it felt like it was deadheading again.

The 3pt hitch works, and I don't have quick disconnect couplers (except on the main line to/from the loader control valve). I have not been messing with hoses (other than to connect a pressure gauge a month or two ago).

My *theory* is that the control valve is not allowing return flow from the top of the cylinder when I try to curl the bucket, but in the other direction the fluid can flow properly. However, I don't know *why* this would happen, nor what to do about it.

Any advice or suggestions are appreciated.

 

[TheOldHokie]

At the same time as I noticed my control valve leaking: https://www.orangetractortalks.com/forums/threads/la650-control-valve-leaking.73021/ I also lost control of the curl cylinder. At first I thought this was simply because of low fluid, but I've since cleaned the sealing surfaces and replaced an o-ring (while I wait for the seal kits) and the leak is mostly gone now.

However, the bucket refuses to curl. When I try I can hear the engine bog down and the relief valve open. I unhooked the line at the control valve to the top of the curl cylinders, and the bucket lifted fine (spraying fluid out of the unhooked hose). I reconnected the hose and the bucket was able to go back down, but when I tried to curl the bucket again, it felt like it was deadheading again.

The 3pt hitch works, and I don't have quick disconnect couplers (except on the main line to/from the loader control valve). I have not been messing with hoses (other than to connect a pressure gauge a month or two ago).

My *theory* is that the control valve is not allowing return flow from the top of the cylinder when I try to curl the bucket, but in the other direction the fluid can flow properly. However, I don't know *why* this would happen, nor what to do about it.

Any advice or suggestions are appreciated.

That spool is regenerative. You most likely have the bucket couplers/hoses on the valve reversed.

Dan

 

[Vagabond]

is it possible it's always been wrong, somehow? I haven't changed any hose routing since I bought the tractor in December, and I've used the bucket/loader plenty.

 

[TheOldHokie]

is it possible it's always been wrong, somehow? I haven't changed any hose routing since I bought the tractor in December, and I've used the bucket/loader plenty.

No - it will not work with the hoses reversed. The only way I know to get that behavior is to pressurize both ports simultaneously which is what regen does.

Dan

 

[Vagabond]

Is it possible something is sticking inside the valve?

 

[TheOldHokie]

Is it possible something is sticking inside the valve?

Nothing to stick - the spool moves as a unit. Personally I would reverse the hoses just to see whst happens.

Dam

 

[Vagabond]

I'll try it, although I think the bucket was moving the right direction according to what I *think* the control layout should be (the decal is long gone).

 

[TheOldHokie]

I'll try it, although I think the bucket was moving the right direction according to what I *think* the control layout should be (the decal is long gone).

Did I mosunderstabd you? I thought you said it extends in BOTH positions.

Dan

 

[TheOldHokie]

I'll try it, although I think the bucket was moving the right direction according to what I *think* the control layout should be (the decal is long gone).

OK - reread the original post. I misunderstood the behavior. Check the tank return connection. Sounds like it is not working. If it has a coupler on it make sure its fully seated.

Dan

 

[Vagabond]

Would the tank return only affect this one cylinder direction? Is this the last one on the valve body? As mentioned the 3 point does work.

 

[TheOldHokie]

Would the tank return only affect this one cylinder direction? Is this the last one on the valve body? As mentioned the 3 point does work.

Yes. Curl is the only function that uses tank return.

Dan

 

[Vagabond]

I'll be damned, that was it. I couldn't tell these were quick connects they were so filthy. This one had come loose. Thank you so much.

 

[North Idaho Wolfman]

Yea a non seated quick disconnect or a clogged/bad quick disconnect will cause all sorts of weird going on's.