NOTICE
To prevent dirt from entering the transmission,
use only clean containers and fillers for the trans-
mission fluid. Do not use fillers or containers that
have been used for water or antifreeze. Dirt, water,
or antifreeze could damage the transmission.
Engine coolant in the transmission hydraulic sys-
tem requires immediate action to prevent malfunc-
tion and possible serious transmission damage.
For more information, see the Allison Transmis-
sion website,
www.allisontransmission.com.
IMPORTANT: When draining transmission fluid,
check for evidence of dirt or water contamina-
tion. A small amount of condensation will appear
in the fluid during operation.
Water contamination is normally characterized
as a milky discoloration of the transmission fluid.
Obvious contamination of the transmission fluid
indicates a leak between the water and fluid
areas of the transmission cooler. Inspect and
pressure-test the cooler to confirm the leak; re-
place leaking transmission coolers.
NOTE: If only the filter is being changed, do not
drain the fluid.
3. Clean the area around the drain plug and the
transmission fluid pan. Place a drain pan under
the transmission and remove the drain plug. Ex-
amine the fluid as it drains.
4. Remove the 12 mounting capscrews (six each)
from the two filter covers. See
Fig. 4.
NOTE: A lot of fluid will drain when the filter
covers are removed.
5. Remove the filter covers, gaskets, O-rings, and
filters from the transmission.
6. Lubricate the new O-rings with transmission fluid,
and install them on the covers.
7. Install the filter over the gaskets.
8. Install the fluid filters on the cover assemblies.
9. Install the filter and cover assemblies into the
filter compartment. Align each cover assembly
with the holes in the channel plate sump, and
push the cover assemblies in by hand to seat the
seals.
NOTICE
Do not use the capscrews to draw the filter covers
to the sump. This can damage the covers, seals,
or sump.
1
1
1
1
2
2
3
3
4
4
f260317c
11/30/2010
NOTE: Allison 4000 Family transmission shown. Com-
ponents and location are similar for Allison 3000 Family
transmissions.
1. Filter Cover
2. Filter
3. Filter Element O-Ring
4. Square-Cut Seal
Fig. 4, Allison Transmission Filter Locations and
Components
Transmission 26
108SD and 114SD Maintenance Manual, May 2016 26/5
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