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Old 05-03-2013, 09:19 PM   #1
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Service Allison, should I or not?

When we bought this coach two weeks ago, the dealer did engine oil/filter change and changed the two fuel filters. They did oil/filter change on the Onan genset. I have an appointment next week at a local Cummins Coach Care shop for the remainder of what I consider good annual chassis maintenance and to just make sure all my stuff is good. On my list:

1. chassis lube
2. change hydraulic fluid filter
3. service air dryer (dessicant filter change)
4. change rear differential lube
5. full tranny service
6. check drive belt, replace if necessary
7. air filter (changed this myself yesterday)

My question. This coach has only 35K miles and, according to the tag in the engine bay, has Transynd in the Allison. While the coach is 6 years old, I believe Transynd is good for many more than 35K miles. Should I just have them change the filters and top off the fluid?

Same question for rear diff. It likely has synthetic lube in it from the factory and at 35K miles, should still be good to go.

According to a tag attached to the coolant reservoir, the coolant was changed in 2011 and replaced with Compleat Extended Life coolant so that should be fine.
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Old 05-03-2013, 09:25 PM   #2
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I would recommend getting the transmission filters changed and having a sample of transmission fluid analyzed. The chances are that you won't need a fluid change. I highly recommend Buy an Engine Oil Analysis Kit Today | Engine Oil Analysis Service
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Old 05-04-2013, 09:22 PM   #3
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Allison recommends a change of fluid and filters at 5,000 miles initially.
Then fluid and filters every 25,00 miles or 12 months if non-Transynd.
If Transynd, 100,000 miles or 48 months on the fluid and 50,000 miles or 24 months on the filters.
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Old 05-04-2013, 09:48 PM   #4
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Quote:
Originally Posted by HicksRA View Post
Allison recommends a change of fluid and filters at 5,000 miles initially.
Then fluid and filters every 25,00 miles or 12 months if non-Transynd.
If Transynd, 100,000 miles or 48 months on the fluid and 50,000 miles or 24 months on the filters.
Well, based on the 48 months, I should do both filter and fluid change (the tranny has Transynd) since it is 6 years old with only 34,000 miles.
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Old 05-04-2013, 10:55 PM   #5
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transmission is easy to service straight forward. about $150 - 180 diy depending on the size of sump.
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Old 05-04-2013, 11:08 PM   #6
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sml, what I do with any new to me purchase...service everything, that way I know for sure what I have and when it was done...this makes it an easier decision for future maintenance and gives me peace of mind knowing what I have.
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Old 05-05-2013, 12:00 AM   #7
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Change 'em

Of the things you listed the transmission is one of the simpler services. Very easy to do yourself and pretty much fool proof. Allison's web site has detailed instructions on how to do it. You need to first measure your transmission sump. It's either 2 or 4 inches deep. That will tell you how much Transynd to have on hand and also which filters to buy. Be aware that on some rigs you may need more because of the way the transmission cooler drains. Mine took almost 3 quarts more than Allison specified.

The most difficult is the air dryer, if it's a Haldex. There are several different sets of instructions for it on this site. I found it possible to change the filter without disconnecting the air lines and removing the entire assembly from the chassis. Possible, not exactly easy.

Good luck with it!
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Old 05-05-2013, 12:57 AM   #8
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Quote:
Originally Posted by HicksRA View Post
Allison recommends a change of fluid and filters at 5,000 miles initially.
Then fluid and filters every 25,00 miles or 12 months if non-Transynd.
If Transynd, 100,000 miles or 48 months on the fluid and 50,000 miles or 24 months on the filters.
The above is not necessarily true.

Transmissions with serial number 6510670912 (3000) & 6610205144 (4000) and higher no longer require the 5,000 mile service. Lower numbers still do.

Here is the link to the latest document 1099 that contains the service intervals.
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Old 05-05-2013, 06:47 AM   #9
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I agree with the above. When buying a new to you rig. I'd change all filters and fluids. If you are going to cummins they should have a check list for your chassis. They will check your front end, brakes, hight level, lube, etc.
once you have this initial investment you now know the entire status if your rig.
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Old 05-05-2013, 05:46 PM   #10
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I assume the transmission came from the factory with Transynd. If not, and the previous owner switched to Transynd, you may want to change the fluid again. Allison requires two changes of fluid if converting to Transynd before you get the benefits of extended service life.
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Old 05-05-2013, 06:09 PM   #11
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Pull the filters and look at the date stamped on them. If it is the year it was built I'd do the whole route. If it is only a year or two old, then I'd do some checking. If it's a 4000 Allison it's going to take about 38 Qts to refill.
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Old 05-05-2013, 08:35 PM   #12
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Quote:
Originally Posted by Mr_D View Post
The above is not necessarily true.

Transmissions with serial number 6510670912 (3000) & 6610205144 (4000) and higher no longer require the 5,000 mile service. Lower numbers still do.

Here is the link to the latest document 1099 that contains the service intervals.
You're right. I should have mentioned that. Being a 2007 model, it's probably right on the edge of the later serial numbers.
Thanks for the clarification.
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