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What type of oil to use in Fuller 10 speed transmission?
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twswtn
Posted 9/2/2009 21:35 (#833440)
Subject: What type of oil to use in Fuller 10 speed transmission?


I am getting ready to change the transmission oil in a Mack CH613 that I just bought. It has a Fuller
FRO-15210C transmission with approx 400k miles. Oil in the transmission now appears to be red in color and I am told by Mack Service Mgr that it is probalby 50 wt synthetic. He says I can refill with either 50 wt motor oil or 80W-90 GL5 gear oil. This seems like a wide spread in the visosicity of the two oils?
I would rather use the 80W-90 since that is what is used in the rear axles. Anyone else using 80W-90?
TIA

Edited by twswtn 9/2/2009 21:36
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farmboy99
Posted 9/2/2009 21:54 (#833479 - in reply to #833440)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?


SE South Dakota
I would put the 50 wt syntheic back in. The trans will shift better when it is cold with the lighter weight oil. I use the 50 weight, no problems.
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hillfarmer
Posted 9/2/2009 21:59 (#833492 - in reply to #833479)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?



80 90 is not recommended for the Trans

if there is tag saying that there is synthetic in it I would most definitely keep

synthetic in it
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Delmarva Ag
Posted 9/2/2009 22:02 (#833500 - in reply to #833440)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?



Seaford, Delaware
Farmboy99 is correct! Put the 50 weight synthetic in. The 80w-90 gear oil is too thick of a viscosity for that particular transmission especially in colder climates.

Alan
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Delmarva Ag
Posted 9/2/2009 22:12 (#833522 - in reply to #833440)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?



Seaford, Delaware
Also if you have the extended warranty out to 500,000 or 750,000 miles make sure the gear lube is Eaton/Roadranger approved or your warranty will be voided.

Alan
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alvis
Posted 9/2/2009 22:18 (#833530 - in reply to #833440)
Subject: Re: What type of oil to use in Fuller 10 speed transmission?



southwestern,ontario
Synthetic would be your best option...may cost more but will last longer and not break down like reg 80/90...
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plowboy
Posted 9/2/2009 22:19 (#833534 - in reply to #833440)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?



Brazilton KS

SAE 50 is only slightly heavier then 85W90.  It is approximately the same viscosity as 95W140.

 

Keep the synthetic in it.   They put it in there for a reason.



 

Lubrication manual


Edited by plowboy 9/2/2009 22:27
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JohnW
Posted 9/3/2009 02:06 (#833785 - in reply to #833534)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?


NW Washington
Here is some more info on transmission lube oils. http://www.heavydutytrucking.com/2003/04/076a0304.asp
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twswtn
Posted 9/3/2009 08:19 (#833867 - in reply to #833440)
Subject: RE: What type of oil to use in Fuller 10 speed transmission?


Thanks everyone for all the info! I am going to use 50 wt.
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king cotton
Posted 9/3/2009 21:15 (#834453 - in reply to #833867)
Subject: RE: hey twswtn what model is your mack and what motor you have in it?..nt


nt
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