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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #11  
Old 01-15-2020
pauleburgess pauleburgess is offline
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My old rockwell manual for my drive (86PT-40,8v92) called for 80w90, so thats what she got. Gallons of it. I used a Lucas oil that meets GL-4 and GL-5, which I believe is dino.
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  #12  
Old 01-15-2020
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Steelwheels Steelwheels is offline
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Quote:
Originally Posted by pauleburgess View Post
My old rockwell manual for my drive (86PT-40,8v92) called for 80w90, so thats what she got. Gallons of it. I used a Lucas oil that meets GL-4 and GL-5, which I believe is dino.
Did you see any performance improvement with the Lucas, lower temp, anything?

On page 6 of the Rockwell Field Maintenance Manual No.1 it says “experience has shown use of SAE 140 viscosity grade will result in longer gear life.”
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Last edited by Steelwheels; 01-15-2020 at 08:17 PM.
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  #13  
Old 01-16-2020
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gcyeaw gcyeaw is offline
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Just curious, has anyone worn out a rear end on a bird? My guess is NO. Seals go bad, but the only mechanical issue I know of is broken gears due to wheel spin or trying to 'rock' the coach when stuck in mud,snow, etc.
Wheel bearings are another issue, they do sometimes fail, but would changing to a synthetic really make a difference? Most bird owners just don't put enough miles on a coach to gain anything in my opinion.
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  #14  
Old 01-16-2020
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Originally Posted by gcyeaw View Post
Just curious, has anyone worn out a rear end on a bird? My guess is NO. Seals go bad, but the only mechanical issue I know of is broken gears due to wheel spin or trying to 'rock' the coach when stuck in mud,snow, etc.
Wheel bearings are another issue, they do sometimes fail, but would changing to a synthetic really make a difference? Most bird owners just don't put enough miles on a coach to gain anything in my opinion.
I think you are right Gardner, but my coach was synthetic via the PO and my mechanic recommended that I stay with it so I have and for no other reason
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  #15  
Old 01-16-2020
MRPutz MRPutz is offline
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Quote:
Originally Posted by gcyeaw View Post
Just curious, has anyone worn out a rear end on a bird? My guess is NO. Seals go bad, but the only mechanical issue I know of is broken gears due to wheel spin or trying to 'rock' the coach when stuck in mud,snow, etc.
Wheel bearings are another issue, they do sometimes fail, but would changing to a synthetic really make a difference? Most bird owners just don't put enough miles on a coach to gain anything in my opinion.
Good point... also on my old VW sand rails they say not to go synthetic not just because of the leak issue but they say the old dino oil conducts heat better than synthetic? Besides, my common sense says use the oils the engine was designed to run. Putting synthetic in my 67 VW or 78 Bus just doesn't make sense.
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  #16  
Old 01-16-2020
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Quote:
Originally Posted by MRPutz View Post
Good point... also on my old VW sand rails they say not to go synthetic not just because of the leak issue but they say the old dino oil conducts heat better than synthetic? Besides, my common sense says use the oils the engine was designed to run. Putting synthetic in my 67 VW or 78 Bus just doesn't make sense.
Internet hooey.
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  #17  
Old 01-16-2020
MRPutz MRPutz is offline
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Originally Posted by badandy View Post
Internet hooey.
But I read it on the internet so i KNOW it's true!

https://www.urbandictionary.com/define.php?term=Hooey
I was going to paste the definition of "hooey" but would have been moderated.
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  #18  
Old 01-16-2020
badandy badandy is offline
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Well Meritor has a PDF that shows the approved oils for their axles. Pretty much any gear lube of any kind is approved, synthetic or otherwise.

meritor-approved-rear-drive-axle-lubricants-amalie-synthetic-gear-lubricant-75w90-80w140(2).pdf
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  #19  
Old 01-16-2020
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I have 75w90 in mine for 3 years and 10,000 miles with no problems.
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  #20  
Old 01-16-2020
MRPutz MRPutz is offline
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Quote:
Originally Posted by badandy View Post
Well Meritor has a PDF that shows the approved oils for their axles. Pretty much any gear lube of any kind is approved, synthetic or otherwise.

Attachment 65888
Good stuff.. Thanx for sharing.
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