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Has anyone on here changed their transmission fluid filters & do you have to drain allison transmission fluid?

On my list of things to do. As the filters are accessed to on the bottom of the Ally, the fluid would drain out. A cleaner job would be to use the drain plug, do the filters and pump it back in. You figure the fluid is OK still? Here is another post on that. https://www.airforums.com/forums/f159/a ... 34551.html

Yes but with fluid change
No, But why wouldn't you unless you recently changed to tran synd fluid

Fredf wrote: ↑Sun Jan 31, 2021 7:27 am Has anyone on here changed their transmission fluid filters & do you have to drain allison transmission fluid?

Fredf
No need to drain the fluid to change the Allison filters.

There are two round covers, held in place by 6 bolts each, which must be removed when replacing the 2 filters.
Removing them does not "drain" the fluid...However you will loose a quart or so when removing them.

See also: https://www.airforums.com/forums/f159/a ... 34551.html
And: https://www.youtube.com/watch?v=_5PbOg9x4qo

As Mel has stated, there's no need to drain the fluid(drain plug is 3/8" square-drive, located on the horizontal(bottom) of the control module(the MD3060 has no pan per se).
Check the cast filter covers PRIOR to removing your filters.
If the cover has the the numbers "29507434", you'll require the square-cut seals, and they're not included in the filter kit(kit has o-rings and fiber gaskets). The square-cut seals are Allison #29501469.

Robert K wrote: ↑Sun Jan 31, 2021 9:09 am Yes but with fluid change
No, But why wouldn't you unless you recently changed to tran synd fluid

YES, excellent question!

Another lesson I recently learned after my Conifer->Cortez r/t, check and/or replace the plug in the "other" dipstick hole.
I'd noticed a bit of weeping somewhere along the driver side of the MD3060. Dust does not a proper oil seal make. I finally crawled under and started laying hands along the "seep" looking for a more moist spot. I was greeted by an extremely loose duct plug(rubber sleeve over a threaded bolt held together by a captive nut(end of the threaded bolt has knurled threads to prevent the nut from falling off)). Tightening the bolt causes the draws the nut into compressing(and expanding) the rubber sleeve. The sleeve had originally been expanded into the hole that would be used if a dipstick was inserted into opposite side of the transmission. In my case, the original plug had hardened, and would not properly seal...
Here's the new/improved method of sealing the penetration into the transmission.
Plug - Allison p/n 29530328
Seal - Allison p/n 29546229

JoeyD wrote: ↑Sun Jun 20, 2021 4:40 pm Another lesson I recently learned after my Conifer->Cortez r/t, check and/or replace the plug in the "other" dipstick hole.
I'd noticed a bit of weeping somewhere along the driver side of the MD3060. Dust does not a proper oil seal make. I finally crawled under and started laying hands along the "seep" looking for a more moist spot. I was greeted by an extremely loose duct plug(rubber sleeve over a threaded bolt held together by a captive nut(end of the threaded bolt has knurled threads to prevent the nut from falling off)). Tightening the bolt causes the draws the nut into compressing(and expanding) the rubber sleeve. The sleeve had originally been expanded into the hole that would be used if a dipstick was inserted into opposite side of the transmission. In my case, the original plug had hardened, and would not properly seal...
Here's the new/improved method of sealing the penetration into the transmission.
Plug - Allison p/n 29530328
Seal - Allison p/n 29546229

JoeyD
Although I bought the Plug & Seal I found that simply tightening the bolt, (in the existing "expanding plug"), stopped the leak ai the"other" dipstick hole.

Hello Mel
I pulled the original plug to check the state of it(soft pliable or hard brittle). It was extremely stiff and very chewed up. The coach is only a '95 with 71k Mi. on it, so I have no excuse as to why the rubber was so destroyed(vibration or the PO(shop)) may have noodled with it. I do get tired of making 2-hour r/t parts runs after "oh, look, something else needs to be r/r".
As an aside, I had a new set of Toyo M170(9R22.5) mounted, and they're about the smelliest tires I've ever owned. Initially, I thought I had developed a leak in my black & gray tanks.