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Old 12-16-2017, 08:54 PM   #1
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Changing the filters on 4000MH transmission

I just changed the filters on my 4000MH transmission. Total time is less than an hour as this is really a pretty easy procedure.
Check your filter and fluid change interval here:
http://www.allisontransmission.com/p...or#cal-results

There are several references for this procedure, but I used this one:
https://www.quora.com/How-do-you-cha...n-transmission
The first half is a 1000 trans, skip down to the 4000 tutorial.

I purchased the Allison filter kit #29558118 (same as #29548988) here:
https://www.ebay.com/itm/Allison-Hig...051729?vxp=mtr

Pretty simple really. It is not necessary to drain the fluid before changing filters. Just unbolt six 15mm bolts for each filter. I did one filter a time starting with the Main filter (passenger side) as less fluid drains from it. Place a drain pan under the filter cap before removing it to catch the fluid. I lost less than 4 quarts total. Replace the o-rings and gasket for each filter and place the new filter down onto the cap. There is also an internal o-ring inside each filter that fits down onto the cap. Lube all three o-rings and the gasket with clean ATF. Re install the filter and cap and torque to spec in a cross pattern. Then do the second filter the same way.

My trans dipstick is accessed from inside the coach. It had a yellow plastic tag saying to use Allison Transynd only. I added 1 gallon of liquid gold.

I started the engine and selected D, then R, then N and ran the engine for a few min. I then pressed both the up and down arrows simultaneously to check the fluid level. All is well again.
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Old 12-17-2017, 05:09 AM   #2
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Quote:
Originally Posted by vito.a View Post
My trans dipstick is accessed from inside the coach. It had a yellow plastic tag saying to use Allison Transynd only. I added 1 gallon of liquid gold.

I started the engine and selected D, then R, then N and ran the engine for a few min. I then pressed both the up and down arrows simultaneously to check the fluid level. All is well again.
Did you need to do a " Transmission Stall" (you put transmission in Drive with brakes On and increase rpm to 1000-1100 for 30 seconds or so) to heat up oil enough for the Fluid Level test to work?

I had to do this for about 40 seconds to get the oil temp up to 145 degrees. First I check fluid level cold using the dip stick just be sure I close to the full level, then do the "Allison fluid level test".
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Old 12-18-2017, 01:58 PM   #3
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Yes I did. I ran on fast idle it for about 20 min and then cycled through D and R.
The manual says it needs to be warmed up for a quantity reading, but later on while checking the leveling system I was able to get a reading just after I started it up.
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