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95 Allison MD3060R leaking fluid

February 16, 2018, 08:54:51 pm

yesterday I discovered that my 95 u240 with a MD3060R allison transmission was 2 gals low on fluid.  I have not had any leaks in the past.  The fluid would not touch the stick.  I put 2 gals of fluid in and checked the level and it was in between the run hot marks.  Today I discovered that all of the fluid had ran out on the ground.  I looked and found a 1" hole just above the ID plate on the drivers side.  Something must have been in it.  The hole is smooth no threaded.  Here is a pic.  any ideas what was in it?  why did it come out, and many other questions.

Pat,

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Re: 95 Allison MD3060R leaking fluid

Reply #1 – February 16, 2018, 09:00:35 pm

forgot the pics.

Pat,

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Re: 95 Allison MD3060R leaking fluid

Reply #2 – February 16, 2018, 09:06:11 pm

If I remember right, it is just a rubber plug that you tighten and it expands, should be able to pick one up at a Allison dealer, I think it allows the dip/fill tube to be installed on either side of the case.

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Re: 95 Allison MD3060R leaking fluid

Reply #3 – February 16, 2018, 09:24:55 pm

John is correct, if you are not close to an Allison dealer you can get a rubber expansion plug fro any NAPA store. That would get you to the Allison store.

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Re: 95 Allison MD3060R leaking fluid

Reply #4 – February 16, 2018, 11:26:27 pm

Thanks for posting that info. I will put that on my to do list to make sure that mine has not gotten old and hard. If Napa fails you you may be able to get a cork at Ace Hardware.

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Re: 95 Allison MD3060R leaking fluid

Reply #5 – February 17, 2018, 01:00:50 am

Not trying to flame you 48 but it looks like your trans has a thick coating of grease ,oil and dirt,to the extent it may be causing
the trans to run hotter,every degree towards cool helps.You may have to take a scraper to get it off then degreaser.

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Re: 95 Allison MD3060R leaking fluid

Reply #6 – February 17, 2018, 06:05:20 am

Since the alternate dip stick location hole (that is what it is) has been open for awhile, I would change fluid and filters after driving a few more miles.  No way dirt did not get in there.

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Re: 95 Allison MD3060R leaking fluid

Reply #7 – February 17, 2018, 10:27:05 am

Thanks for all the replies. 
This is a story for doing some of the maint. on the MH yourself.  I am going on a little 4 day run and was changing the oil and filter on the engine,  when I also checked the tranny fuild level. Nothing touched the stick DRY. 
Allison dealer in Lufkin,TX was told by Allison about the dip stick location issue and now I have got an Allison replacement part on the way, be here on monday.  Yes Wolfe,  I don't even know when the problem happened.  I look all the time for leaks under the MH and I never have even a drip anywhere.  Yes John I agree with you about the grease and dirt.  Like I said I never have any drips, but for a long time, around the big hoses at the back of the retarder, it is always wet looking.  I watch the tranny temp and engine temp all the time(a lot since the new engine rebuild) .  My tranny has never ran over 200 deg.  It goes up when the retarder is being used, but never over 200.  Amazing if I had not checked the dip stick level, I would not have know that anything was wrong.  Tranny shifted and worked fine.  I was noticing that the retarder light on the console did not come on sometimes.

Pat,

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Re: 95 Allison MD3060R leaking fluid

Reply #8 – February 17, 2018, 12:37:45 pm

Likely the reason Pat does not see tranny temps over 200 is that Foretravel put the dash tranny temp gauge sender into a drilled & tapped hole in the large return line elbow FROM the tranny cooler.

We wanted to know tranny temps, so we drilled and tapped a hole into the OUTPUT elbow, plugged the original hole, and moved sender.  Now we see the quick rise on mountain descents and quick cool at the bottom of the hill.

I had occasion to tell a Foretravel tech about our sender relocation and his reply was 'you will be frightened by what you see'.  I guess he figured it better to hide the true temps.

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