Fel losing lifting power

Jerry70 · Jul 12, 2019

Hello everyone,
I own my b6200hst for a few months now and run into a little problem. The Fel is losing its lifting ability. Started after replacing all the Lines leading from the control box to the Fel. I had a Line blow out on me and decide that all the lines needed replacing, No telling how old they were. Shortly there after the Fel started losing its lifting ability over the week. It will pick the bucket up slowly. If there any weight in the bucket it hardly moves. I can sometimes get it to lift, if I put the control lever back at center and try lifting again. Im wondering if there air in the lines, was told it should self bleed the air out? All fluid levels are good, filter's were all changed prior to this happening. Or do I have a bad control valve? and how to go about checking them out.
Thanks for listening.

Dave_eng · Jul 13, 2019

In view of the fact that you changed lines, it is likely you have two in the wrong place.

Are there 6 or 7 lines on your loader valve?

Can you see identification marked on the valve body. Letters like P or T

Daave

torch · Jul 13, 2019

Did you use teflon tape on the connections? Could be a bit of tape got into the line.

D2Cat · Jul 13, 2019

Might very well have a cylinder seal leaking internally.

bxray · Jul 13, 2019

Does the curl work?
If so try swapping lines.
If the problem moves it is in the valve, if not it is in the lift.

Another would be a quick disconnect problem.
Might not be in all the way or clogged.

Ray

tthorkil · Jul 13, 2019

If you have not already done so, I would suggest operating both the curl and lift cylinders through their full range with no load a few times to help push the air out of the cylinders.
I imagine that air could find its way around the internal cylinder seals. I have no hydraulic experience but that seems like a good place to start -
I have replaced a couple of hydraulic hoses on my FEL and that is what I found to work.

Jerry70 · Jul 13, 2019

hmmm,
I didn't use Teflon tape on the fittings, heard bad thing about it with hydraulic fluid. The Fel worked fine after replacing the lines from the control box to it, there are only 4 lines coming out of the control box to the Fel. It worked fine, but started losing lifting power over a week's worth of use. The Bucket curl's just fine, no problem there. I will try and move the lines around and see if the problem moves from the lifting to the bucket. My control Box doesn't have any identification marks on the quick connections so I marked them before replacing with a punch. So I know there in the right order and connected right. Fel would have been working in the wrong order to the way I moved the control lever.

North Idaho Wolfman · Jul 13, 2019

Everyone is hitting on points:

Type of thread sealant used, if any?
Any Quick disconnects involved?
How many lines did you change?
Is it a stock Kubota FEL and Valve?
Did it work perfectly before it blew a hose?
If it effecting roll and lift or just lift?

Jerry70 · Jul 13, 2019

North Idaho Wolfman said:
Everyone is hitting on points:

Type of thread sealant used, if any?
Any Quick disconnects involved?
How many lines did you change?
Is it a stock Kubota FEL and Valve?
Did it work perfectly before it blew a hose?
If it effecting roll and lift or just lift?

Didn't use any type of sealant, no leaks, Only replaced the 4 lines going to the Fel from control lever box, the 3 coming from tractor haven't been replaced yet, so I guess there a total of 7 lines. Only the ones going to fel replaced, worked fine and then start slowly over a period of a week losing lift. Its a Smc 64Q loader, made for Kubota. Someone said it too big for the tractor but its what came on it and worked great. Before the line blew on the Fel it was working great, had lift. The curling of the bucket seems not to be a problem.
There are 4 quick disconnects on the 4 lines I replaced, didn't replace the connector's, they seemed to be fine. No dirt just a little surface rust on the outside of them.

North Idaho Wolfman · Jul 13, 2019

Jerry70 said:
Didn't use any type of sealant, no leaks, Only replaced the 4 lines going to the Fel from control lever box, the 3 coming from tractor haven't been replaced yet, so I guess there a total of 7 lines. Only the ones going to fel replaced, worked fine and then start slowly over a period of a week losing lift. Its a Smc 64Q loader, made for Kubota. Someone said it too big for the tractor but its what came on it and worked great. Before the line blew on the Fel it was working great, had lift. The curling of the bucket seems not to be a problem.
There are 4 quick disconnects on the 4 lines I replaced, didn't replace the connector's, they seemed to be fine. No dirt just a little surface rust on the outside of them.

Pull the Quick disconnects on the line side and clean the inside of the line side of them with brake parts cleaner, I'll bet that's where it's clogged.
I've seen guys use a cut off wheel to make hoses and the debri will clog up a quick disconnect, well, quick!

Pau7220 · Jul 13, 2019

North Idaho Wolfman said:
I've seen guys use a cut off wheel to make hoses and the debri will clog up a quick disconnect, well, quick!

I have 2 local shops that make hoses, both use cut off wheels. Since I've witnessed that, all my new hoses (even pre-packaged snow plow hoses) get brakleen then blown out before install. I always get crud out.

Jerry70 · Jul 14, 2019

Wondering if there a safe way to force anything out of the lift cylinder's. Raising the fel to max height and undo one line on one cylinder and then lowering. Forcing out any junk in the cylinder? Rinse and repeat for the other lift cylinder. Also flush the connected line out at the same time? Not worried about fluid lose or air. Anyone got a suggest on if it might work or a better way?

Dave Pierson · Oct 23, 2020

Jerry70 said:
Hello everyone,
I own my b6200hst for a few months now and run into a little problem. The Fel is losing its lifting ability. Started after replacing all the Lines leading from the control box to the Fel. I had a Line blow out on me and decide that all the lines needed replacing, No telling how old they were. Shortly there after the Fel started losing its lifting ability over the week. It will pick the bucket up slowly. If there any weight in the bucket it hardly moves. I can sometimes get it to lift, if I put the control lever back at center and try lifting again. Im wondering if there air in the lines, was told it should self bleed the air out? All fluid levels are good, filter's were all changed prior to this happening. Or do I have a bad control valve? and how to go about checking them out.
Thanks for listening.

My FEL is doing exactly the same thing. Did you ever get yours working propery?

Captain13 · Oct 23, 2020

I wouldn’t remove any lines with the system under pressure to flush. North Idaho Owl man’ sad ice is what we do around here, brake cleaner through the line to remove the gunk. I have a suction system called a Green Sucker that I use to suction lines and gunk out, if needed. If you have only cycled the FEL through a few times to remove any air, I have found that if I do a cycle and then let the tractor sit for several minutes, the aerated fluid will release the air bubbles. If you continually cycle without a rest period you may be cycling aerated fluid before it has a chance to release the air Thus keeping air trapped in the system.

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Fel losing lifting power

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