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Open Roads Forum  >  Tech Issues

 > 2004 differential goes out

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n4hwl

Murfreesboro,TN

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Posted: 09/09/17 10:22pm Link  |  Quote  |  Print  |  Notify Moderator

I had a differential Failure at 90,000 miles on a 2004 Tiffin Phaeton Freightliner X Chassis
Oil was changed at 50,000 with synthetic oil.
Left carrier bearing completely failed and came apart.
Differential was made by Mercedes model R190-2N
Replaced with a Weller rebuilt differential # RS21.0-2
Some questions I have ....
Has anyone else had this type of failure ?
Any ideas on probable cause?
Could I have done anything to prevent this?
Has anyone heard of warranty claims on this type of failure in Mercedes differentials put into Freightliner chassis in and around 2004 models?
Video of of differential below.

https://youtu.be/z2wZAoRp9JY


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MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 09/10/17 03:49am Link  |  Quote  |  Print  |  Notify Moderator

"Oil was changed at 50,000 with synthetic oil"

Is/was the synthetic oil specifically approved by brand name and weight, by Mercedes?

Quicksilver, has a Fuller 10/5/13 Transmission, auxiliary, and OD.

If ANYTHING other than fifty weight mineral oil is used, the transmission and auxiliary will fail. Not a mere chance of failing - a 100% guaranteed burnout. Even super-magic 101% ultra synthetic lubricants will fail this powertrain device. I am not aware of any Fuller approved alternative for 50 weight mineral oil. I learned how to, and rebuilt several of these turkeys including my own and for a fact the needle bearings of the twin countershafts will seize. Fuller countershafts are so sensitive they have to be "timed" to each other.

Captain_Happy

Pahrump, Nevada

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Posted: 09/10/17 06:29am Link  |  Quote  |  Print  |  Notify Moderator

I was told once by a mechanic to never put syn oil in a rear diff because the oil wouldn't stay on the axle long enough to get out to the bearings.

SidecarFlip

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Posted: 09/10/17 07:30am Link  |  Quote  |  Print  |  Notify Moderator

Been our experience at the shop to never switch from the OEM approved lubricant for any powertrain related component.


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fj12ryder

Platte City, MO

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Posted: 09/10/17 09:02am Link  |  Quote  |  Print  |  Notify Moderator

Captain_Happy wrote:

I was told once by a mechanic to never put syn oil in a rear diff because the oil wouldn't stay on the axle long enough to get out to the bearings.
You need to find another mechanic.


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ScottG

Bothell Wa.

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Posted: 09/10/17 10:08am Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Captain_Happy wrote:

I was told once by a mechanic to never put syn oil in a rear diff because the oil wouldn't stay on the axle long enough to get out to the bearings.
You need to find another mechanic.


Yep, that one was an idiot.


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OH48Lt

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Posted: 09/10/17 10:12am Link  |  Quote  |  Print  |  Notify Moderator

Many Ford trucks come OEM with synthetic oil in the diffs.


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drsteve

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Posted: 09/10/17 10:18am Link  |  Quote  |  Print  |  Notify Moderator

SidecarFlip wrote:

Been our experience at the shop to never switch from the OEM approved lubricant for any powertrain related component.


What he said.


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Kayteg1

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Posted: 09/10/17 10:25am Link  |  Quote  |  Print  |  Notify Moderator

Mercedes operating fluids

Been buying Mercedes cars for whole family for over 20 years and never heard about differential failure, even few of them passed 300k miles.
Commercial MB vehicles put US mechanics to skill test as for example Sprinter vans, making 2-3 millions km in Europe without major repair - are falling apart on US ground.
MB USA is known for goodwill repairs on items that should last lifetime, so why don't you call 800 FOR MERC

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 09/10/17 10:30am Link  |  Quote  |  Print  |  Notify Moderator

.............The Key (Repeated)........................

Is/was the synthetic oil specifically approved by brand name and weight, by Mercedes?

Mechanics, Snake Oil advertising, and bad advice abound. After digging HARD AND LONG into whether or not MoPar approved synthetic transmission lube is mandatory for my toad, facts finally emerged. Sourced at MoPar

Synthetic lube is NOT mandatory, however the transmission life will be greatly enhanced because the "MoPar approved synthetic fluid does not decompose at elevated temperatures, and offers a better level of lubricity compared to proper grade of petroleum ATF".

I elected to stay with the much more costly MoPar approved ATF.

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