Thomas SAF-T-LINER C2, Maintenance Manual

Page: 74 / 176

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. 5 .
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.
Hot Check
Recommended Method
With the vehicle on a level surface and the transmis-
sion in neutral at operating temperature, perform the
steps below.
1. On the transmission shift selector, press the up
and down arrow keys simultaneously. See
Fig. 6 .
2. Release the arrow keys and wait for a two-
minute countdown.
3. The transmission shift selector display screen will
display one of the following messages.
•
OL - OK indicates an acceptable oil level.
•
OL - HI followed by a number indicates the
amount that is over-filled.
•
OL - LO followed by a number indicates
the amount that is under-filled.
•
OL - 70 indicates that the transmission is
not up to operating temperature.
1
1
1
1
2
2
3
3
4
4
f260317 08/25/95
1. Filter Cover
2. Filter Element
3. Filter Element O-Ring
4. Square-Cut Seal
Fig. 4, Allison 3000 Series Transmission Filter Location
and Components
12/01/97
A
B
f270002a
A. Cold Run Band B. Hot Run Band
Fig. 5, Dipstick Markings
Transmission
26
Saf-T-Liner C2 School Bus Maintenance Manual, July 2020
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