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Rear Differential Oil

C

cosmaar1

Senior Member
Joined
May 14, 2020
Messages
509
Location
Ohio
Changed out the rear differential oil today on the 555E. It came out as black as used motor oil.

The manual calls for NH134D which is a hydraulic oil, but I’ve never seen hydraulic oil turn the color, consistency, and look of used motor oil. Anyone have this happen before? The machine has 4200 hours on it but I didn’t think hydraulic oil could turn this way.

With everything I’ve said, I’m assuming no one has ever changed the oil prior to me buying it and that it’s original OEM oil from the factory.
 
C

cosmaar1

Senior Member
Joined
May 14, 2020
Messages
509
Location
Ohio
I would have never thought, but changing the oil has completely eliminated my brake chatter. Ran the machine for 8 hrs today and it didn’t make a peep. Prior to, when it was warm and I used the brakes, I thought I was going to rip the rear end out.
 
JD955SC

JD955SC

Senior Member
Joined
Mar 13, 2011
Messages
1,356
Location
The South
cosmaar1 said:
I would have never thought, but changing the oil has completely eliminated my brake chatter. Ran the machine for 8 hrs today and it didn’t make a peep. Prior to, when it was warm and I used the brakes, I thought I was going to rip the rear end out.
Click to expand...
Oil has a major effect on wet brake performance both actual braking and noise.

some machines use a friction modifier additive to help the brakes as well.

do check your brake discs if possible through an inspection port or indicator. You don’t want them to wear the friction material off and start grinding into the steel discs it goes from a simple replace seals and discs to rebearing and replace damaged parts very quickly.
 
J

JLarson

Senior Member
Joined
Aug 23, 2020
Messages
656
Location
AZ
Occupation
Owner- civil and heavy repair/fab company
Dirty oil or the wrong oil definitely makes trouble for the wet brakes.

We had a place that was putting aw68 hydro in all their tractor rears, they made all kinds of noise lol.
 
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