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Old 05-22-2022, 10:25 AM   #15
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Alright, more confused then ever…

From the pics below I have a 2inch pan, correct? Not a 4 inch…
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Old 05-22-2022, 10:30 AM   #16
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I ask, as I did drain the fluid and got 14.5 quarts out… that’s without removing the filters which I understand drains another 1/2 to 1 quart.

So, thats low oil for a 4 inch sump…

But waaaay over for a 2 inch sump, right? A 2 inch sump is 10.5 quarts, right?

Looking at the prior owners notes about 10,000 miles ago he called out a mechanic as it was shifting “funny.”

Mechanic said it was really low on oil, and added 9 quarts???

It’s run perfectly fine since…

Thoughts?

I will be replacing the oil with new transynd too…
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Old 05-22-2022, 03:03 PM   #17
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Can you find a part number stamped on the pan, if so confirm it is a 2" pan.



The internal oil level sensor doesn't care if it is a 2" or 4" pan, it just measures for the correct level. These sensors can fail, I remember a recent post of someone having to replace. Same with the oil temp sensor.



Take a deep breath and don't make any changes yet.



Confirm whether you have a 2" or 4" pan. You might have to pull a filter and check the part number as they are different for a 2 and 4" pan. If it is a 2" pan I'd change the fluid and filters and add back the correct amount for a 2" pan.

Then check your fluid level again via the shift pad, does it read OK.

Then check check your dipstick, does it correspond?


Since you are doing some fluid check/changes consider getting an oil analysis. I use JG Lubrication, pack of 3 sample kits is ~$100.
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Old 05-22-2022, 03:19 PM   #18
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Watched the YouTube video by adept ape. He shows a 4 inch pan and it’s 3.5 inches deep. The 2inch pan is 1.5 inches deep.

Seems I have the 2 inch pan. Will check for a part number just in case.

Ordered 5 gallons of transynd from Amazon, only $180… filters from a truck store for a 2 inch pan were $60 for genuine Allison.

Will take out the filters next weekend make sure it’s a match.

If so, it seems the last mechanic overfilled by a bunch. If there’s 14.5 quarts so far, and another 1 quart from the filters… that’s 15.5 quarts in there, as opposed to what seems to be the recommended 10.5 for a fluid and filter change.

The only concern I have is I did see some posts on the internet that sometimes the oil cooler isn’t taken into account???

If we assume the last mechanic added 9 quarts, which is what he billed for… and there’s 15.5 quarts in there now… then there was 6 quarts in there when he added. So, it was in fact low. Just not sure where he came up with 9 quarts as the amount.

Again, the dipstick level was 3-4 inches over the full mark… cold…


Plan so far is to put in the recommended 10.5 quarts, and see if everything works, and check on the keypad. If it’s not working right, we go back to 15.5 quarts

Either way, no way it was 7 quarts low… I must have mis read that, and the oil temp was low despite a 3 hour drive…
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Old 05-22-2022, 03:41 PM   #19
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Over the 18 years and 200k miles, I change fluid in my MH3000 [2inch] sump several times. Almost always got 16 qrts in with filter change. Always check when tranny is at ops temp with engine at idle. When cold and not running, some fluid will drain back from converter giving the appearance of being over filled, if checked on the stick.
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Old 05-22-2022, 05:00 PM   #20
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Quote:
Originally Posted by Old Scout View Post
Over the 18 years and 200k miles, I change fluid in my MH3000 [2inch] sump several times. Almost always got 16 qrts in with filter change. Always check when tranny is at ops temp with engine at idle. When cold and not running, some fluid will drain back from converter giving the appearance of being over filled, if checked on the stick.
That’s a good data point to know. Is the 16q based on dipstick or on the readout? How long did you let it drain?



I’m lost now. Allison website states 10.5 q on oil change with 2 inch pan…

My MH ran flawlessly for over 10,000 miles “overfilled.” No leaks, no issues…

Argh!
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Old 05-22-2022, 06:50 PM   #21
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Hmmm… so, most every Allison chart I see states 10.5 quarts to refill the 2 inch pan…

Then found this chart in thread on here, states 17 quarts on refill on 2 inch pan!!!

Why 2 totally different recommendations?

https://www.irv2.com/forums/f125/hel...-351167-2.html
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Old 05-22-2022, 08:46 PM   #22
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Been awhile since my last change MH3000 fluid change--2" vs 4" sump is the question. But 10.5 qtrs seems very low for any 3000 tranny. Again, I used 16 qtrs with fluid and filter change. Would lose about 1-2 qtrs when doing the 36k miles filter change [Transynd]. Often drained the 3000 at ambient temps and didn't really wait for the converter to drain. Recently change fluid/filter on my 4000--waited overnight for converter to drain--expected to use 8 gal of fluid on refill but ended up using 9 gal. After a similar situation to yours, I basically ignored the stick on the 3000, in favor of using the display on the keypad.
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Old 05-22-2022, 09:01 PM   #23
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You might want to take it to an Allison distributor's shop, not an ordinary dealer, and ask them to set it and you straight. They will certainly know fluid level for your sump etc.
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Old 05-23-2022, 07:05 AM   #24
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You might want to take it to an Allison distributor's shop,.


And have the keypad checked out to verify it is working.
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Old 05-23-2022, 12:50 PM   #25
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Ref your post #16 pciture of your tranny, get the serial number off the ID plate in the pic. Any Allison or Steward Stevenson shop can tell you everything you need to know about you unit.
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Old 05-23-2022, 02:20 PM   #26
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Thanks guys, will do.
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Old 05-27-2022, 02:10 PM   #27
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Updates…

Called Allison, they simply had voice messaging that directed me to the nearest dealer…

Dealer looked in their Allison brochure, which was the pic above, and said it’s 16-17 quarts.

So, as that’s what I got out, that’s what’s going back in. Dipstick seems waaaaayyyyy off…

The literature on most every site states it’s 10.5 quarts. I wonder if that’s what happened to the PO, someone put in 10.5 quarts and the tranny worked poorly…

I wish to thank everyone for their help, and I hope this helps someone down the road….

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Old 06-17-2022, 02:04 PM   #28
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Just wanted to close out the info for this thread…

Went to a local freightliner, they verified 17 quarts of fluid in a 2 inch pan.

Put that much in, as that’s about what I got out.

Now checked on the dipstick, and it was at the full mark.. very odd. The trans was empty for a week or so, so all the residual oil off the fill tube must have drained down completely. I think before I was reading the “splatter oil” all over the fill conduit, which made the dipstick inaccurate.

Drove it up to temp, which was darn near impossible. Trans temps don’t exceed 170 unless it’s 95 degrees outside.

The tranny shift much better with the transynd. Seems to shift earlier, and smoother.

So in case this comes up again: 17quarts for 2 inch sump. 19 quarts for 4 inch.
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