re: Total replacement of hydraulic oil - problem (JD1050)

e,baxter · Nov 21, 2019

I recently replaced the water fowled hydraulic oil in my JD1050 and Allied 390 front end bucket cylinders (disconnecting all lines and fully evacuating the oil out of the 4 hydraulic cylinders, and elsewhere).

Now, after cleaning the stainless steel filter, and replacing the oil and filter - the rear rocker tilt works fine, but the front end bucket system started to work, but then stopped working....

Do I need to "bleed" air out of the front bucket cylinders (4), to allow the oil to fully fill all cylinders and lines ?

If, yes, how would I best do this ?

(Notes: The front lift started to go up, but then stopped and will not go further up, nor down. The bucket curling, does not work at all...it curled down when I was lifting, but I think it was just falling due to gravity. ) E,Baxter

DeltaRed · Nov 21, 2019

One thing comes to mind.The tractor simply ran out of oil. You filled it to the fill mark. Fine for a 'naked' tractor. The added loader requires additional oil. Check the level with all cylinders extended and full. add more if indicated.Also,did you change the hydralic filter? It may be plugged. Even a new filter can get plugged . "Bleeding" should not be necessary. Simply working the cylinders in/out a few times will purge the air.

Steve in VA · Nov 21, 2019

Here is another possible culprit based on
bleeding the cylinders. Did you disconnect
any of the lines? If so, if these lines use
a disconnect, one or more may not be
completely seated. I've experienced this
on one of my tractors as well as a hyd
driver chipper. The line looks good but
isn't fully seated. Its possible the
supply is good, pressed up the cylinder
for initial movement but then dead headed
and stopped. This would also explain why
only the loader is inop. Just a thought.

DeltaRed · Nov 21, 2019

I,m wondering if a poppet has stuck.However I'm not familiar with that tractor to venture any more guesses.

e,baxter · Nov 21, 2019

Yes, I changed the filter. All connections are fully seated.

Key issue: You know bleeding is not necessary, correct ?

E,Baxter

Thank you.

e,baxter · Nov 21, 2019

And yes, I put 6.8 gallons of oil in system, as spec'ed, and checked it again after first tries, and yes it is still full.

E,Baxter

Steve@Advance · Nov 21, 2019

Though the cylinders don't need bleeding, sometimes the pump does.

If the pump is higher than the tank, it may not be able to draw the oil up.

Does the engine load when you try to move any cylinder? If no, then the pump isn't building pressure.

Try carefully loosening a line from the pressure side of the pump with the engine running. Be ready to quickly close the connection, because once it catches it will move a lot of oil. Best have an assistant ready to shut it down just in case.

re: Total replacement of hydraulic oil - problem (JD1050)

e,baxter

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DeltaRed

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Steve in VA

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DeltaRed

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e,baxter

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e,baxter

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Steve@Advance

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