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Flushing hydraulic fluid?

B

Brent in IA

Member
Not strictly Farmall related except I pull it with a Farmall...
I recently acquired a hydraulic dump trailer that my uncle no longer needed - and I did.... It hasn"t been used for quite a few years and I want to change the hydro fluid. It has both a DC-powered hydro powerpack as well as the ability to connect to hoses to a tractor"s hydraulics if desired. I know I can drain and refill the resevoir but how do I get the cylinder and hoses cleared out - do I have to remove the hoses from the cylinder and drain it like that? It is a heavy version of a normal barge-wagon hoist but is a 2-way cylinder.
 
Photo
a124897.jpg
 
Look at color & consistency of the oil, it may be clear or caramel color, not ok if black or creamy yellow, its contaminated with dirt/grit or water. The oil doesn't ever wear out it just gets contaminated. If its a single action system ( most are) 1 hose hookup, lower the hoist, this will leave the least amount to change but know that the tractor system may need to be checked.
 
By the time you run the hoist up and down a half dozen times with the tractor it will be flushed out with the tractor hydraulic oil.
 
I was trying to avoid contaminating the tractor fluid as I
recently changed it...I may hook it up to another one that
needs to be changed yet. Thanks
 
It is milky and yellow, likely full of moisture from years of condensation, etc.

This one is a 2-way cylinder, not 1-way like most.

Thanks
 
You'll never get 100% of the old oil out. Most people don't even bother trying.

Draining and refilling the reservoir is more than good enough. What little oil remains in the cylinder and lines will get diluted in the new oil and you won't even notice.

The only way to do it without contaminating other oil is to pull the lines and cylinder(s) and drain them completely. Then you will need to bleed out all the air to get things working again. It's a LOT of work for limited benefit.
 
Thanks....that is what I thought too but if there was another
way that I didn't think of I wanted the experts on this board to
weigh in. Thank you!
 
I don't know if this would work or not but could you take the down side hose off the tractor and take the quick coupler off and put the hose in a empty pail and raise the wagon up and when you get it all the way up put the quick coupler back on and hook it back up and let the wagon down and you should have clean oil in the cylinder. I don't know if it will work or not but you could try.

Bob
 
I bet it would....I am going to give that a shot! I assume I will have to add fluid to the tractor as I go to replace the old stuff I am flushing out but other than that sounds like a great idea. Thanks!
 
That'll get some of it but not all. There will still be some contaminated oil in the hose.

Also, as soon as you let it back down, some of the contaminated oil that was in the hose connected to the tractor will get into the tractor.

The amount of contaminated oil that enters the system will amount to a few cupfuls, and will be VERY diluted at that point, but it will still be there. It is still no big deal, IMHO. I'm just pointing out that this isn't a foolproof method either.
 
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