ter in the hydraulic system may cause undue wear of
transmission parts, make valves stick, and clog pas-
sages.
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.
1. Park the vehicle on a flat, level surface.
2. Apply the parking brakes and chock the rear
tires.
3. Run the engine for at least one minute.
4. Shift from DRIVE to NEUTRAL, and then shift to
REVERSE to fill the hydraulic system.
5. Shift to NEUTRAL and allow the engine to idle at
500 to 800 rpm.
6. With the engine running at idle, remove the dip-
stick from the tube and wipe it clean.
7. Insert the dipstick into the tube and remove the
dipstick.
8. 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 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. 5.
CAUTION
As the fluid temperature increases, so does the
fluid level. Do not fill above the COLD RUN band if
the transmission fluid is below normal operating
temperature.
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.
Hot Check
1. Park the vehicle on a flat, level surface. Apply
the parking brakes and chock the rear tires.
2. Shift the transmission to NEUTRAL.
3. Operate the engine at idle (500 to 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 temperature
is 180 to 220°F (82 to 104°C).
4. With the engine idling, remove the dipstick from
the tube and wipe it clean.
5. Insert the dipstick into the tube and remove the
dipstick.
6. 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. 5.
Eaton Fuller and Meritor
CAUTION
Operating a transmission with the fluid level
higher or lower than recommended can result in
transmission damage. Do not overfill the transmis-
sion. Overfilling will force fluid out of the case
through the main shaft openings. Fluid overflow
may also drain onto the clutch or clutch brake,
causing additional problems.
Do not mix types and brands of fluid, because of
possible incompatibility. Do not use fluid addi-
tives, friction modifiers, extreme-pressure gear
fluids, or multiviscosity lubricants.
With the transmission at operating temperature, and
the vehicle on a level surface, check the fluid level in
the transmission.
12/01/97
A
B
f270002a
A. Cold Run Band B. Hot Run Band
Fig. 5, Dipstick Markings
Transmission26
Century Class Trucks Maintenance Manual, April 200526/6
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