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, 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 MD/MH Series
Transmission Fluid
Level Checking
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.
3. With the engine running, wipe the dipstick clean
and check the fluid level. Any level within the
COLD RUN (lower) band is satisfactory for oper-
ating the vehicle. See
Fig. 2. If the level is not
within the COLD RUN band, add or drain fluid
until it reaches the middle of the COLD RUN
band.
4. Perform a hot check at the first opportunity after
normal operating temperature, 160 to 200°F (71
to 93°C), is 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.
f260007a
05/27/93
Fig. 1, Transmission Breather
11/16/2000
f270074
Fig. 2, Transmission Dipstick
Transmission 26
Recreational Vehicle Chassis Maintenance Manual, June 2015 26/1
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