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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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  #21  
Old 01-16-2020
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Quote:
Originally Posted by kunzelj View Post
I have 75w90 in mine for 3 years and 10,000 miles with no problems.
Synthetic or conventional ?

Isn’t the conventional recommendation to change every two years ?
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  #22  
Old 01-16-2020
pauleburgess pauleburgess is offline
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Originally Posted by Steelwheels View Post
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.”
Nothing quantified-- maybe quieter, but then again, that's to be expected compared to running darn near empty.
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  #23  
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.
Well, I don't know the circumstances and I don't have access to the records right now, but the original owner of my 86 PT38 (Hemmings Motor News guy) had the rear end rebuilt twice and then had it replaced around 300K miles if I remember right. Based on the notes that came with it, he had it serviced routinely along with the oil changes, etc. But it also has a beefed up 2 1/2" Class 5 receiver hitch and came with a very heavy solid 2 5/16" ball drawbar implying that he towed a heavy trailer which would explain extra wear on the differential.
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'82 FC35 (sold)
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  #24  
Old 01-17-2020
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Originally Posted by skywalker6582 View Post
Well, I don't know the circumstances and I don't have access to the records right now, but the original owner of my 86 PT38 (Hemmings Motor News guy) had the rear end rebuilt twice and then had it replaced around 300K miles if I remember right. Based on the notes that came with it, he had it serviced routinely along with the oil changes, etc. But it also has a beefed up 2 1/2" Class 5 receiver hitch and came with a very heavy solid 2 5/16" ball drawbar implying that he towed a heavy trailer which would explain extra wear on the differential.
My PT40 rear end was replaced in the 90s, but I don't know much more of the story. Something just wasn't right with it. That owner put on 200k miles, from my research.
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  #25  
Old 01-17-2020
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Everyone of them had a broken ring gear or pinion,i would bet money on it.
All you need to do is park on ice overnight and be a little heavy on the go pedal in the morning and you too will be putting in a rebuilt pig.
Or,park on wet grass and spin a wheel in the morning and let the wheel grab the hard ground,snap!
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  #26  
Old 01-17-2020
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Originally Posted by Randy Dupree View Post
Everyone of them had a broken ring gear or pinion,i would bet money on it.
All you need to do is park on ice overnight and be a little heavy on the go pedal in the morning and you too will be putting in a rebuilt pig.
Or,park on wet grass and spin a wheel in the morning and let the wheel grab the hard ground,snap!
especially an 8V92, similar rear gear as a 6V and FC with much less HP/Torque
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  #27  
Old 01-17-2020
badandy badandy is offline
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The book says they were available with diff locks or no-spins. I wonder how rare/expensive those are? Would Blue Bird have optioned any that way? I think a diff lock would be nice to have.
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  #28  
Old 01-17-2020
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Originally Posted by Bill Pape View Post
especially an 8V92, similar rear gear as a 6V and FC with much less HP/Torque
Hey Bill and Randy, what’s your recommendation on gear oil and the change interval ?
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  #29  
Old 01-17-2020
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Use the best oil you can buy/afford.
The cheap stuff will not hold up.
Use name brand oil,not some no-name stuff from the flea market.
As an example,i use Hygard hydraulic fluid from John Deere,i can buy cheapo brand hyd. fluid for $30 for 5 gal.
The Hygard cost $100 or so.
But,the fan motor and the pto pump cost ig money,why take a chance on cheap beer? err,fluid!
Same thing with tube grease,i use the Lucas red sticky stuff (i like red).
In my rearend i would use Lucas,i like Lucas,i think its a name you can trust.
I'm not sure if John Deere has rearend lube like we need,but i bet Cat does.
Lucas,Cat or John Deere has to be good stuff.
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  #30  
Old 1 Week Ago
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I ended up going with 80w-90w I think Bill had recommended that the last time I changed it out. Napa sells a 80w-90w that Valvoline makes its about 70$ with the AITA discount. From the Rockwell manual it says change it every 2 years.
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