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Freightliner Cargo Maintenance Manual - part 12

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Transmission Housing

Transmission Oil Pan Gasket

5/16–18 Washer-Head
Capscrew

Plug

Transmission Oil Pan

Magnet

Drain Plug Gasket

Drain Plug

5/16–18 x 5/8 Capscrew

10. Flatwasher

11. Transmission Oil Filter
12. Oil-Filter Spacer
13. O-Ring
14. Oil-Filter Tube
15. Plug

Fig. 9, Allison MT Series Transmission, Filter Removal

Transmission

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Place a suitable container under the transmis-
sion. Remove the drain plug and gasket from the
transmission oil pan. Allow the fluid to drain.

Remove the nut that secures the oil filler tube to
the transmission pan.

Remove the 21 capscrews that secure the trans-
mission oil pan to the transmission housing. Re-
move the transmission oil pan and gasket from
the transmission. Discard the gasket.

Clean the oil pan of any debris and residual fluid
in an approved cleaning tank.

Remove the washer-head capscrew that secures
the filter to the transmission. Remove the filter
and the filter intake pipe from the transmission.

Separate the filter intake pipe from the filter. Dis-
card the O-ring. Clean the tube.

Install the filter intake pipe on the new filter. In-
stall a new O-ring on the filter intake tube. Lubri-
cate the O-ring with a light coat of transmission
fluid.

10. Insert the filter intake pipe into the orifice on the

bottom of the transmission. Secure the filter with
the 5/16–18 x 5/8-inch washer-head capscrew.
Tighten the capscrew 10 to 15 lbf·ft (14 to 20
N·m).

11. Place a new oil pan gasket on the oil pan. If de-

sired, a sealant may be used on the gasket, but
it must be applied carefully. Sealant must be pre-
vented from contacting areas of the oil pan
flange that are inside the raised bead of the
flange.

NOTE: Do not use gasket-type sealing com-
pounds or cement anywhere inside the trans-
mission or where they might get washed into
the transmission. Non-soluble vegetable-base
cooking compounds or fibrous grease must not
be used inside the transmission.

12. Install the oil pan and gasket onto the transmis-

sion. Check that no dirt or debris enters the pan.
Secure the pan to the transmission housing with
four 5/16–18 washer-head capscrews installed
into the corners of the oil pan, but do not tighten.

13. Install the remaining 17 washer-head capscrews

by hand. Check that all of the capscrews are
hand tight.

14. Tighten each capscrew with a click-type torque

wrench 60 lbf·in (700 N·cm). Use the torque pat-
tern shown in

Fig. 10

to distribute the torque

evenly. Repeat this procedure and torque the
capscrews with a click-type torque wrench 15 to
20 lbf·ft (20 to 27 N·m).

15. Install the oil filler tube on the oil pan. Tighten

the tube fitting 90 to 100 lbf·ft (122 to 136 N·m).
Install the drain plug and gasket. Tighten the
drain plug 15 to 20 lbf·ft (20 to 27 N·m).

16. Pour approximately 15 quarts (14 liters) of

Dexron

IIE transmission fluid into the transmis-

sion. Start the engine and allow the transmission
fluid to circulate. With the transmission in NEU-
TRAL, check the fluid level. Check for fluid leaks.
Correct any leak with the engine OFF.

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NOTE: Torque the oil pan bolts with a click-type torque
wrench following this torque pattern. Tighten the bolts
60 lbf·in (700 N·cm). Repeat the torque pattern with a
click-type torque wrench 15 to 20 lbf·ft (20 to 27 N·m).

Fig. 10, Allison MT Series Transmssion, Oil Pan Torque

Pattern

Transmission

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Checking the Fluid Level

Cold Check

Clean all dirt away from around the end of the fluid
fill tube before removing the dipstick.

CAUTION

Do not allow foreign matter to enter the transmis-
sion. Dirt or foreign matter in the hydraulic system
may cause undue wear of transmission parts,
make valves stick, and clog passages.

It is important to check the fluid level cold to deter-
mine if the transmission has a sufficient amount of
fluid to be safely operated until a hot check can be
performed.

Park the vehicle on a flat surface.

Apply the parking brake and chock the tires.

Run the engine for at least one minute.

Shift from DRIVE to NEUTRAL, and then shift to
REVERSE to fill the hydraulic system.

Shift to NEUTRAL and allow the engine to idle at
500 to 800 rpm.

With the engine running at idle, remove the dip-
stick from the tube and wipe clean.

Insert the dipstick into the tube and remove the
dipstick.

Check the fluid level reading and repeat the
check procedure to verify the reading.

If the fluid level is within the COLD RUN band,
the transmission may be operated until the fluid
is hot enough to perform a HOT RUN check.

If the fluid level is not within the COLD RUN
band, add or drain fluid as needed to adjust the
fluid level to the middle of the COLD RUN band.
See

Fig. 11

for the AT and MD Series, and

Fig. 12

for the MT Series.

CAUTION

Do not fill above the COLD RUN band if the trans-
mission fluid is below normal operating tempera-
ture. As fluid temperature increases, so does the
fluid level. Filling above the COLD RUN band
when the transmission is below normal operating

temperature may result in an overfilled transmis-
sion, which causes fluid foaming and aeration.
Fluid foaming and aeration cause transmission
overheating and erratic shifting.

NOTE: Perform a hot check at the first opportu-
nity after the normal operating temperature,
160° to 200°F (71° to 93°C) has been reached.

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A. Cold Run Band

B. Hot Run Band

Fig. 11, AT and MD Series Dipstick Markings

CHECK IN NEUTRAL AT IDLE

HOT RUN

FILL

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A. Transmission Housing/Oil Pan Split Line
B. Hot Run Band
C. Cold Run Band

Fig. 12, MT Series Dipstick Markings, 5.1-Inch Depth

Oil Pan

Transmission

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Hot Check

Park the vehicle on a flat, level surface. Apply
the parking brake and chock the tires.

Shift the transmission to NEUTRAL.

Operate the engine at idle (500–800 rpm) until
normal operating temperature is reached. Check
that the sump temperature is 160° to 200°F (71°
to 93°C). Check that the converter-out tempera-
ture is 180° to 220°F (82° to 104°C).

With the engine idling, remove the dipstick from
the tube and wipe it clean.

Insert the dipstick into the tube and remove it.

Check the fluid level reading and repeat the
check procedure to verify the reading. Safe oper-
ating level is within the HOT RUN band on the
dipstick. The HOT RUN band is between the
HOT FULL and HOT ADD marks.

If the fluid level is not within the HOT RUN band,
add or drain fluid as needed to bring the fluid
level within the HOT RUN band. See

Fig. 11

for

the AT and MD Series, and

Fig. 12

for the MT

Series.

Transmission

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