freightliner Custom Classic MT45 2022, Maintenance Manual

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26–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine or motor, set the parking brake, and chock
the tires. Before working under the vehicle, always
place jack stands under the frame rails to ensure
the vehicle cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
26–01 Transmission Breather
Checking
Transmission housing breathers must remain clear. A
plugged breather could result in pressure build-up,
which could cause lubricant leakage.
If the breather is plugged, clean or replace it. See
Fig. 1 . Check more often if the vehicle is operating
under very dusty conditions.
26–02 Allison Transmission
Fluid Level Checking
NOTICE
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.
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.
IMPORTANT: For oil and filter change intervals,
see the applicable Allison Operator’s Manual.
Cold Check
IMPORTANT: After replacing the transmission
fluid or changing the filter(s), it is important to
check the fluid level cold to determine if the
transmission has a sufficient amount of fluid to
be safely operated until a hot check can be
performed.
1. A cold check may be made when the sump tem-
perature is 60 to 104°F (15 to 40°C).
2. Run the engine for at least one minute to clear
the fluid system of air.
NOTICE
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.
3. Clean all dirt away from around the end of the
fluid fill tube before removing the dipstick. With
the engine running, wipe the dipstick clean and
check the fluid level. Any level within the COLD
RUN (lower) band is satisfactory for operating
the vehicle. If the level is not within the COLD
RUN band, add or drain fluid until it reaches the
middle of the COLD RUN band. See
Fig. 2 .
4. Perform a hot check at the first opportunity after
normal operating temperature, 160 to 200°F (71
to 93°C), is reached.
f260007a 05/27/93
Fig. 1, Transmission Breather
Transmission
26
Walk-In Van Chassis Maintenance Manual, 06/15/2022
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