Community Forums

bneiva · 08-28-2021, 07:53 PM

I've read some posts in the past couple of days where questions were raised about changing the filters on a Allison 3000 transmission. Being I Just completed doing just that today, I thought I would cover the questions/concerns raised in those posts, as I remember them.

First, the filters kit for this transmission is now 29558329. This number superseded the original number 29540494. The kit includes both filters, the filter cover gaskets and the o-rings for both the filter covers and the drain plug. But please note: YOU DO NOT NEED TO DRAIN THE OIL IN ORDER TO CHANGE FILTERS! I had a difficult time finding the filters at a reasonable cost but was able to order the kit for $54.00, on the internet

It took me 1.5 hours to complete the task and was able to do it with the air bags deflated.

The only special tool needed is a torque wrench for the 12 fasteners which get torqued to 38-45 ft lbs.

Lastly, I only lost a total of 2 quarts of oil.

Sadly, I couldn't remember the posts where these questions were raised but hopefully those who were seeking answers will see this.

Bill,
03 American Tradition ISC 350

Twomed · 08-28-2021, 09:30 PM

Try 38-45 INCH pounds or you will be in big trouble. [emoji26][emoji26]

bneiva · 08-28-2021, 09:35 PM

No sir, I stated it correctly: 38-45 ft lbs.

Bill

RichKimball · 08-29-2021, 04:24 AM

Quote:

Originally Posted by Twomed

Try 38-45 INCH pounds or you will be in big trouble. [emoji26][emoji26]

That is incorrect Twomed, the spec is in FT LBS. The drain plug is listed at 18-24 ft lbs in my notes, with Bill's listed spec for the filter bolts.

I'm just getting ready to replace my fluid and filters so thanks Bill for the info.

Twomed · 08-29-2021, 05:03 AM

Quote:

Originally Posted by Twomed

Try 38-45 INCH pounds or you will be in big trouble. [emoji26][emoji26]

Mea culpa guys

...too much Ida stuff

allison_tech · 09-03-2021, 05:14 AM

Quote:

Originally Posted by Twomed

Try 38-45 INCH pounds or you will be in big trouble. [emoji26][emoji26]

its definitely ft lbs, if you used inch pounds you will have leaking filters, depending on the miles on the coach I would torque them to 40. Older the trans is and the more times the filters have been replaced. The better chance you have of pulling the threads out trying to achieve 45 ft lbs of torque.

bneiva · 09-03-2021, 05:43 PM

Quote:

Originally Posted by allison_tech

its definitely ft lbs, if you used inch pounds you will have leaking filters, depending on the miles on the coach I would torque them to 40. Older the trans is and the more times the filters have been replaced. The better chance you have of pulling the threads out trying to achieve 45 ft lbs of torque.

I've changed the filters 6 times now in the past 20 years and still set the torque for minimal (38 ft lbs) and never had a leak yet. I don't know when my trans qualifies as being "old" but I sure do hope I'm around to see it!

Tha_Rooster · 09-04-2021, 04:50 PM

Quote:

Originally Posted by bneiva

I've read some posts in the past couple of days where questions were raised about changing the filters on a Allison 3000 transmission. Being I Just completed doing just that today, I thought I would cover the questions/concerns raised in those posts, as I remember them.

First, the filters kit for this transmission is now 29558329. This number superseded the original number 29540494. The kit includes both filters, the filter cover gaskets and the o-rings for both the filter covers and the drain plug. But please note: YOU DO NOT NEED TO DRAIN THE OIL IN ORDER TO CHANGE FILTERS! I had a difficult time finding the filters at a reasonable cost but was able to order the kit for $54.00, on the internet

It took me 1.5 hours to complete the task and was able to do it with the air bags deflated.

The only special tool needed is a torque wrench for the 12 fasteners which get torqued to 38-45 ft lbs.

Lastly, I only lost a total of 2 quarts of oil.

Sadly, I couldn't remember the posts where these questions were raised but hopefully those who were seeking answers will see this.

Bill,

03 American Tradition ISC 350

If this is first time changing should the fluid been changed also?

bneiva · 09-04-2021, 05:53 PM

Quote:

Originally Posted by Tha_Rooster

If this is first time changing should the fluid been changed also?

After 20 years of ownership, this was my 6th filter change. But yes, had this been the first filter change, the oil would have also been changed.

allison_tech · 09-05-2021, 09:39 AM

You should be able to see it get very old with routine maintenance. I've worked on some very old transmissions that were in perfect working order.

wolfe10 · 09-05-2021, 09:44 AM

Quote:

Originally Posted by bneiva

I've changed the filters 6 times now in the past 20 years and still set the torque for minimal (38 ft lbs) and never had a leak yet. I don't know when my trans qualifies as being "old" but I sure do hope I'm around to see it!

I agree. I stay at the very minimum torque spec window for the filter cover bolts. They are steel into aluminum.

Like you, never had a leak. And, were there to be one, no problem upping torque a little.