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Old 03-16-2016, 07:42 PM   #1
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The third oil filter on Allison MD3060

I am the new owner of an 1995 Allegro Bus with 12 valve Cummins and Allison MD3060 transmission. I researched for hours fluid information and filter replacement procedure. I already have the Transynd fluid and went today to Stewart and Stevenson to buy the filters. To my surprise the parts girl shows three filters...the regular filters

Allison Filter Kit 29548987

and another filter called a suction filter

29544785-DF - FILTERS & FILTER KITS

It looks like the lower part of the transmission must be disassembled to access this suction filter. Research has been unsuccessful other than finding places that sell the filter.

Is anyone familiar with this filter and the procedure to replace it? I don't like the idea of running on a 21 year old filter. Thanks in advance.
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Old 03-16-2016, 07:59 PM   #2
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3rd Allison Filter

A couple of years ago we Had a presentation by Allison Transmission engineers at our annual meeting of volunteers. They indicated that the internal "filter" is not really a filter but simply a Device to catch big pieces if the tranny fails. No need to ever change it.
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Old 03-17-2016, 08:35 AM   #3
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The internal "filter" is only changed during a transmission overhaul. It is not a routine maintenance part. You only need to change the two externally accessible filters.

That's straight from Allison. The internal filter is referred to as the "main" filter, while the other two are called "lube" filters. Page 12 of the Allison service documents describes them and their change interval. See http://www.allisontransmission.com/d...s.pdf?sfvrsn=2
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Old 03-17-2016, 01:40 PM   #4
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Terrific! I appreciate your help. Now to do the fluid and "lube" filter change.
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Old 03-17-2016, 10:16 PM   #5
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You would think the parts person would have known that it wasnt serviceable.
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Old 03-17-2016, 10:20 PM   #6
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Quote:
Originally Posted by Gary RVRoamer View Post
The internal "filter" is only changed during a transmission overhaul. It is not a routine maintenance part. You only need to change the two externally accessible filters.

That's straight from Allison. The internal filter is referred to as the "main" filter, while the other two are called "lube" filters. Page 12 of the Allison service documents describes them and their change interval. See http://www.allisontransmission.com/d...s.pdf?sfvrsn=2
Have had three MH's with Allison trans and it's as Gary says. Just change the two lube filters when needed.
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