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Old 05-28-2020, 07:24 AM   #1
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Question on tranny filter change

Good Morning everyone.

We have the Allison 3000MH 6 speed tranny in our new to us 2007 Fleetwood Revolution LE. Its a diesel pusher with a Cat C-9 engine. I always do all my own fluid and filter changes and as the coach is new to us, I dumped engine oil and changed filter, fuel filters, Hydraulic filters.

This way I know everything has been done and I can manage service levels going forward.
Regardless of what dealer or previous said they did.

Last thing for my consideration is the Allison transmission. Should I dump the fluid and change filters or just the filters. It has 70,000 original miles on the coach. If I go with a filter change only, do I change the Primary and the Lube both or just the primary?

Thank you everyone for the advise and opinions.
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Old 05-28-2020, 09:08 AM   #2
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With 70,000 miles it's time to change fluid, not by mileage but time.
Here's an Allison Service manual https://kwds.at/fileadmin//user_uplo...ls-Allison.pdf

If you can document that the oil has been changed (use Castrol Transynd) then just change the filters.

An Allison mechanic gave me a great tip. When changing trans filters, only remove one of the filter covers, replace the filter, seal it up then do the other. By doing it this way, you only lose about 3/4 of a gallon. If you remove both covers at the same time you lose a lot more oil. Transynd isn't cheap so this helps in cutting your cost.
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Old 05-28-2020, 09:14 AM   #3
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I would dump the fluid and change both filters. Then you will be good for a long time.
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Old 05-29-2020, 04:49 AM   #4
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Quote:
Originally Posted by LJowdy View Post
With 70,000 miles it's time to change fluid, not by mileage but time.
Here's an Allison Service manual https://kwds.at/fileadmin//user_uplo...ls-Allison.pdf

If you can document that the oil has been changed (use Castrol Transynd) then just change the filters.

An Allison mechanic gave me a great tip. When changing trans filters, only remove one of the filter covers, replace the filter, seal it up then do the other. By doing it this way, you only lose about 3/4 of a gallon. If you remove both covers at the same time you lose a lot more oil. Transynd isn't cheap so this helps in cutting your cost.

Thank you LJ. I was thinking that way as well. Filters now and complete fluid change end of season.
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Old 05-29-2020, 04:52 AM   #5
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Quote:
Originally Posted by becks View Post
I would dump the fluid and change both filters. Then you will be good for a long time.

Thank you Becks for responding.

. I am thinking of changing the filters now and the fluid in the fall. Iíve already spent quite a bit on engine oil, all filters and hydraulic oil. The tranny oil will be quite pricey. Thank you.
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Old 05-29-2020, 03:42 PM   #6
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Do you know what oil the xmsn has now?

I would pull a sample and have it analyzed before I did anything.
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Old 05-29-2020, 04:09 PM   #7
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Sampling and analysis of the tranny fluid would be good....if this is the OEM fluid, 13 years is a long time to run any fluid, regardless of miles....if you change filters now you will then run old [dirty?] fluid thru the new filters.... then this fall, you put new fluid thru potentially dirty filters....If I were you, do both now and set a baseline for all the critical fluids in your rig????????
PS--how about the generator????lots of time -sensitive oil, coolant and fuel issues?
PSS-- how about Cummins coolant--DCA/SCA, long-life and freeze point?
PSSS--don't necessarily need to change differential oil but check for level--oil level in front axle hubs too......
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Old 05-29-2020, 04:27 PM   #8
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I agree with OldScout. I would do everything or nothing at this point. I did my 4000 series at approx. 65k and mine looked and smelled like it was on the way out. I was glad I did it then and possibly avoided further degradation and transmission issues down the road. I do believe in sampling also and will do that in the future but like you I wanted to start out with everything fresh so I clearly knew where I stood. I did do all fluids and filters on the generator also and would recommend it.
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Old 05-30-2020, 09:06 AM   #9
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Great advise everyone. I will do fluid and filter change so I know what I have. I will get old fluid tested as well just to see the condition of it.

Thank you Everyone. By the way, I did change coolant and oil and fuel and oil filters as well as air in the generator.
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Old 05-30-2020, 10:16 PM   #10
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Don't forget the air brake dryer filter
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Old 05-31-2020, 05:57 AM   #11
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Why wouldnít he change the dryer filter. Certainly not needed to change on a regular basis but on a coach of that age I would change it once. Iíve seen one fail internally and puke the silicate beads into the air system. Not fun to clean out.
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Old 05-31-2020, 06:31 AM   #12
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Chargerman,

I never said to ignore the air dryer filter. I only reminded him about it.

I've had way too many friends who have ignored the air dryer filter for as little as 3 years who ended up with desiccant balls flowing through their air dryer system. It costs big money to have the air brakes system purged of the desiccant material from the exploded filter.

I change my air dryer filter every 2 years. May be overkill but it's peace of mind.
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Old 06-01-2020, 05:22 AM   #13
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Quote:
Originally Posted by LJowdy View Post
Don't forget the air brake dryer filter
Done LJ! Forgot to include in list of whatís done. Thank you.
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Old 06-01-2020, 09:29 AM   #14
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Quote:
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Chargerman,

I never said to ignore the air dryer filter. I only reminded him about it.

I've had way too many friends who have ignored the air dryer filter for as little as 3 years who ended up with desiccant balls flowing through their air dryer system. It costs big money to have the air brakes system purged of the desiccant material from the exploded filter.

I change my air dryer filter every 2 years. May be overkill but it's peace of mind.


Sorry about that I misread your post. I had someone experience a similar issue.
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