freightliner M2 Plus Maintenance Manual page 61

Transmission
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1. Air Regulator
2. Housing
3. Large O-Ring
4. Filter Element
Fig. 7, Eaton Fuller Transmission Air Filter/Regulator
Components
NOTE: Do not remove, disassemble, or adjust
the air regulator. If the air regulator is not
keeping the air pressure between 57 to 62 psi
(393 to 427 kPa), replace the air filter/regulator.
It cannot be repaired.
4. Clean the filter element.
4.1 Dip the filter element in alcohol or other
cleaning solvent. Blow compressed air
through the filter element (inside to
outside) to loosen surface dirt and to dry
the element. The sintered metallic filter
element will last the life of the vehicle,
provided it is not damaged.
4.2 Wipe out the filter housing with a clean,
dry, lint-free rag.
5. Clean and inspect the O-rings and the end cap.
Replace any parts that are damaged.
6. Install the large O-ring, then the filter element
(small end first) into the filter housing.
7. Install the small O-ring in the end cap, then
install the end cap on the filter housing. Tighten
the end cap until firm.
8. Start the engine, and build pressure in the air
system. Check for air leaks at the filter housing
and air line connections, and repair any leaks.
Business Class M2 Plus Maintenance Manual, 02/10/2023
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5. Small O-Ring
6. End Cap
7. Plug
NOTICE
Repair any air leaks. A leaking air filter or air lines
can cause slow or hard shifting of the
transmission, and eventual transmission damage.
26–07 Allison Transmission
Fluid and Filter
Changing
When draining transmission fluid, check for evidence
of dirt or water contamination. 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; replace leaking
transmission coolers.
1000/2000/2400 Series
1. Park the vehicle on a level surface and apply the
parking brakes.
2. Run the engine until the transmission fluid
reaches the operating temperature of 160 to
200°F (71 to 93°C). Shift the transmission to
neutral (N) and shut down the engine.
NOTICE
To prevent dirt from entering the transmission,
use only clean containers and fillers for the
transmission fluid. Do not use fillers or containers
that have been used for water or antifreeze. Dirt,
water, or antifreeze could damage the
transmission.
3. Clean the area around the drain plug. Place a
drain pan under the transmission and remove the
drain plug. Examine the fluid while it drains. If
only the filter is being changed, do not drain the
fluid.
NOTE: A lot of fluid will drain when the filter is
removed.
4. Using a standard strap-type filter wrench, remove
the filter by turning it counterclockwise.
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