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Hydraulic Oil Change

S

stone7

Well-Known Member
Joined
Dec 15, 2012
Messages
65
Location
Midwest
This is a basic question, but I'm going to see if anyone
has any wisdom on this.

I replaced a blown hydraulic line and am in the process of
trying to return this machine to full working status.

When the hydraulic line blew much of the hydraulic
oil leaked out. The sight tube only shows about 4 inches.
Well under the add mark. I was surprised how pretty much
everything worked except driving, with so little hyd fluid.

I was planning on draining out this old hydraulic oil,
and replacing it with fresh new hydraulic oil. I've found
a new filter cartridge.

I'm just wondering if there is any more to a hydraulic oil
change. The SM doesn't say much. And I can't think of any
way to purge the individual cylinders of hyd fluid. I'm not
going to tear anything down for this.

Anyway, thanks.


JLG40HA, dual fuel, 2wd, proportional controls
 
VoodooMojo

VoodooMojo

Senior Member
Joined
Jan 18, 2012
Messages
344
Location
Baltimore, East Coast USA
Occupation
Sr Technical Service Representative
Just have all the cylinders retracted when the oil is drained from the tank.
This will get all but about 7 gallons out.
The machine holds 50 gallons in the tank and the rest in the hoses and actuators.

Don't forget to clean out the hydraulic oil tank and filter housing when you have it emptied.
There can be a ton of muck lying about.

JLG used either Kendall Hyken 052 or Mobilfluid 424 depending on the vintage of the mahine. Kendall for the earlier versions and Mobilfluid for the later.
 
S

stone7

Well-Known Member
Joined
Dec 15, 2012
Messages
65
Location
Midwest
It never crossed my mind to clean the tank. Thanks.

I've got a few gallons of mineral spirits I could dump
in the tank and swirl it around with a yard stick. I don't think
mineral spirits would hurt anything if I got it all back out.

I've got a 55 gallon drum of Mobil NUTO H32, it was
painfully expensive, and I guess there won't be much
left over. The shop where I got this machine told me
they used mobil AW32, and my local bulk oil place
told me this NUTO H32 replaced this.

Correct or not, that's what it's going to be.

Thanks.
 
V

vikashshinge

New Member
Joined
Aug 24, 2012
Messages
2
Location
India
Occupation
Magazine Editor
Be careful

It is better you perform hydraulic oil change from someone professional.. new people do not attempt. If you do not want to pay you can take some tips from EPC Oils Updates and this can help you with the procedure.
 
S

steveman1

Member
Joined
Jan 8, 2013
Messages
6
Location
Houston
Cleaning is probably important. You want to make sure no metal debris is floating around. Probably too late now that the change is done.
 
S

stone7

Well-Known Member
Joined
Dec 15, 2012
Messages
65
Location
Midwest
Looking over the very helpful thread above, I
found my similar tank diagram.

tank.jpg

I didn't want to remove all those bolts, leave
well enough alone and so on. But I see there
are two filters inside the tank.

The cartridge filter bowel was pristine, and the
sight gage was nice and clear so I just filled the
tank with fresh fluid. Atleast next time I'll
know to locate all the diagrams and look them
over carefully.

The machine seems to work fine so far,
I'll keep my fingers crossed.

I thought there should be at least one other filter.
I didn't notice anything in the service manual.

Anyway, Thanks.
 
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