Filter
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fected component must be thoroughly drained.
Switching to a synthetic lubricant, when a
petroleum-based lubricant has been used for
50,000 miles (80 000 km) or longer, may affect
transmission performance. Monitor all seal
areas for the first 10,000 miles (16 000 km)
after changing to a synthetic from a petroleum-
based lubricant.
NOTE: The correct fluid capacity is established
by the fill plug opening.
2. Clean the fill plug, then install it in the transmis-
sion. Tighten the plug as follows:
• 25 to 35 lbf·ft (34 to 48 N·m) for Eaton
Fuller transmissions with 3/4-inch pipe
threads.
• 60 to 75 lbf·ft (81 to 102 N·m) for Eaton
Fuller transmissions with 1-1/4-inch pipe
threads.
26–03 Allison Transmission
Breather Checking
Transmission housing breathers must remain clear. A
plugged breather could result in pressure build-up,
which could cause fluid leakage.
If the breather is plugged, clean or replace it. See
Fig. 2. Check more often if the vehicle is operating
under very dusty conditions.
26–04 Allison Transmission
Fluid and Filter
Changing
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.
CAUTION
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.
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.
5. Remove the magnet from the filter attachment
tube or from the top of the filter element.
6. Clean any metal debris from the magnet. Then,
install the magnet on the filter attachment tube.
7. Using transmission fluid, lubricate the gasket on
the filter.
8. Using your hand, install the filter by turning it
clockwise until the filter gasket contacts the con-
verter housing or cooler manifold. Then, turn the
filter one more complete turn.
9. Install the drain plug and sealing washer. Tighten
the plug 22 to 30 lbf·ft (30 to 40 N·m).
10. Clean the area around the fill tube and remove
the dipstick. Using a clean funnel in the fill tube,
add transmission fluid. See Table 3 for approved
transmission lubricants, and Table 4 for lubricant
capacities.
f260007a
05/27/93
Fig. 2, Transmission Breather
Transmission 26
Acterra Maintenance Manual, March 2005 26/3