Changing the fluid in the cylinders of FEL

[AlanB]

So I do my standard Xmsn, Hydro filter changes on my NH 1925, predecessor to TC 33, and think, sure, there is always some residual left behind in the hydraulic cylinders etc that does not drain out, but it blends with the fresh and is good enough.

Then I blew a line or two on the FEL, and changed a couple others, and the oil out of those cylinders was bad. Milky, creamy, watery looking, and thinking about it, that oil really does not cycle out of there, it kind of reaches a volume that shifts left than right, but not really out to the sump.

So now I am going to go through and change that oil, and have thought of various ways from pulling the cylinders and draining to making up some t fittings with valves and all sorts of different out there ideas to where at this point, I think I am going to loosen a fitting, wrap in rags, put a large catch pan under the general area, and cycle it repeatedly to get some fresh up out of the sump and into the cylinders and hoses. Top off and clean as I go using the external lubrication system

Anyone have a better cleaner thought?

 

[Wacky]

Good question. I thought it all cycled through the system so it would not cause this problem???

 

[daman1]

How i have done it in the pass witch seems to work but you will use extra oil so have some on hand.

Retract all cyls(draw them in)change oil/filters,have extra oil on hand,when fresh oil is in start with one cyl, remove piston side hose stick in bucket operate lever to flush hose with new oil then replace line,then remove rod end supply hose and stick in bucket with rpm's low slowly extend the cyl the old oil will be pushed out the hose and into the catch bucket,once fully extended then place rod end(will need to remove from cyl and attach to valve block or etc) hose in bucket flush with new oil then reattach that hose and when cyl is retracted(pulled in)again it's get new fresh oil on both sides.

kind of hard to explain on the computer but doing it like that gets most old oil out.

 

[kennyd]

Good question. I thought it all cycled through the system so it would not cause this problem???

Nope, some oil will always stay in there...there is just no place for it to go.

 

[kennyd]

So I do my standard Xmsn, Hydro filter changes on my NH 1925, predecessor to TC 33, and think, sure, there is always some residual left behind in the hydraulic cylinders etc that does not drain out, but it blends with the fresh and is good enough.

Then I blew a line or two on the FEL, and changed a couple others, and the oil out of those cylinders was bad. Milky, creamy, watery looking, and thinking about it, that oil really does not cycle out of there, it kind of reaches a volume that shifts left than right, but not really out to the sump.

So now I am going to go through and change that oil, and have thought of various ways from pulling the cylinders and draining to making up some t fittings with valves and all sorts of different out there ideas to where at this point, I think I am going to loosen a fitting, wrap in rags, put a large catch pan under the general area, and cycle it repeatedly to get some fresh up out of the sump and into the cylinders and hoses. Top off and clean as I go using the external lubrication system

Anyone have a better cleaner thought?

How i have done it in the pass witch seems to work but you will use extra oil so have some on hand.

Retract all cyls(draw them in)change oil/filters,have extra oil on hand,when fresh oil is in start with one cyl, remove piston side hose stick in bucket operate lever to flush hose with new oil then replace line,then remove rod end supply hose and stick in bucket with rpm's low slowly extend the cyl the old oil will be pushed out the hose and into the catch bucket,once fully extended then place rod end(will need to remove from cyl and attach to valve block or etc) hose in bucket flush with new oil then reattach that hose and when cyl is retracted(pulled in)again it's get new fresh oil on both sides.

kind of hard to explain on the computer but doing it like that gets most old oil out.

Alan, Daman1 idea is good-but messy. There is no "great" way to get the comtaminated fluid out, flushing the lines and manually cycling the cylinder is best.

 

[daman1]

Right messy and consumes extra oil but if you have contaminated dirty oil it's worth the work.

 

[Wacky]

Man, I learn something new everyday on here:thumbsup:!

 

[magicheater]

I have often thought of this especially on 3PT equipment with hydraulics that can sit for long periods of time.