Air in loader system

[zrtext]

On my Case ih compact tractor I seem to have gotten air into the loader and bucket cylinders. The cylinders have slop in them and I can move the bucket 4" by hand. Causes problems when I back drag to level of material.
What's the best way to bleed out the air without a big mess? I think it might have ran low on fluid one time after I purchased a new backhoe. I bad I know.

 

[WinterDeere]

The usual method of bleeding is to crack the nut loose on the cylinder fitting on the side of the cylinder being compressed. But yeah, it makes a big mess.

Others just run the cylinders through many full cycles, hoping it eventually works all of the air back through the line, but I’ve never had much luck with this. Loader lines are very long, so it’s easy for air to get trapped out at the end of what is basically i
a dead end system.

 

[JimRB]

I have rebuilt hydraulic cylinders on my JD. I just work the cylinders both directions to purge the air.

 

[WinterDeere]

I have rebuilt hydraulic cylinders on my JD. I just work the cylinders both directions to purge the air.

I'd bet there's 35 feet of line between the tilt cylinder on my snow plow and the hydraulic reservoir on the tractor, because JD routes their 3rd function from the end of the loader arms to a solenoid and ports on the rear of the tractor, where it's then routed forward again to tie into the main loader hydraulic manifold.

I'd guess you could eventually work all the air from that little cylinder thru all of that line. But given the volume in the lines is many times greater than the volume of the cylinder, it's going to take an awful lot of cycles!

 

[RayIN]

I'd bet there's 35 feet of line between the tilt cylinder on my snow plow and the hydraulic reservoir on the tractor, because JD routes their 3rd function from the end of the loader arms to a solenoid and ports on the rear of the tractor, where it's then routed forward again to tie into the main loader hydraulic manifold.

I'd guess you could eventually work all the air from that little cylinder thru all of that line. But given the volume in the lines is many times greater than the volume of the cylinder, it's going to take an awful lot of cycles!

Wonder how workers on the assembly line accomplish the task? Time is money on an assembly line.

 

[TMGT]

I'd bet there's 35 feet of line between the tilt cylinder on my snow plow and the hydraulic reservoir on the tractor, because JD routes their 3rd function from the end of the loader arms to a solenoid and ports on the rear of the tractor, where it's then routed forward again to tie into the main loader hydraulic manifold.

I'd guess you could eventually work all the air from that little cylinder thru all of that line. But given the volume in the lines is many times greater than the volume of the cylinder, it's going to take an awful lot of cycles!

I've done it on my backhoe and loader after cylinder rebuilds, that's fairly large cylinders and a lot of line. Only takes a few cycles to remove the air.
It sounds like the op either has a problem thats introducing air into the system, or there are some seals going out, if its a persistent problem.



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[TMGT]

Wonder how workers on the assembly line accomplish the task? Time is money on an assembly line.

The system in that video has a small reservoir that can't handle the volume of fluid the cylinder requires, thats why it has to be done in stages.

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[RayIN]

The system in that video has a small reservoir that can't handle the volume of fluid the cylinder requires, thats why it has to be done in stages.

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That applies to the vast majority of hyd. systems. HWH builds closed hyd systems for RV's, they say it can take up to 3x to remove all air from a system that has been opened.

 

[TMGT]

That applies to the vast majority of hyd. systems. HWH builds closed hyd systems for RV's, they say it can take up to 3x to remove all air from a system that has been opened.

I wouldn't say majority, most systems used on equipment have extra capacity for cooling.
The only systems I've really seen with small reservoirs are limited use systems, like you might find in electric over hyd leveling jacks that maybe see a minute or two of cycle time for the day.

Tractors, construction equipment, log splitter etc. have enough capacity that you can fill the reservoir, and cycle empty cylinders and then just top off.



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[Bentrim]

As has been stated before work the cylinder thru a few cycles, that will work the air out of the cylinders. It may help if you can level the cylinder or raise each end as you cycle the cylinder so the air goes out of the cylinder first.
I used to work with farm equipment and installed a lot of new cylinders and loaders and found just cycling the cylinders a few times removed all the air, be sure to check the oil level in the resourvoir after bleeding.