4
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 necessary to bring the
level to the middle of the COLD RUN band.
•
Perform a hot check at the first opportunity after the normal operating sump
temperature 160–200°F (71–93°C) is reached.
b.
Hot Check
•
Park the vehicle on a level surface and shift to
N
(Neutral) or
P
(Park). Set the
parking brake and/or emergency brakes and chock the vehicle wheels. Allow
the engine to idle (500–800 rpm).
•
Wipe the dipstick clean and check the fluid level. The safe operating range is
any level within the HOT RUN band on the dipstick. If the level is not within
this band, add or drain fluid as necessary to bring the level to the top of the
HOT RUN band. Approximately 1 quart (1 liter) of fluid is required to raise
the level from the bottom to the top of the band.
1–5. KEEPING FLUID CLEAN
It is absolutely necessary that the fluid put into the transmission be clean. Fluid
must be handled in clean containers, fillers, etc., to prevent foreign material from
entering the transmission. Lay dipstick in a clean place while filling the
transmission.
1–6. RECOMMENDED AUTOMATIC TRANSMISSION FLUID
AND VISCOSITY GRADE
•
Hydraulic fluids (oils) used in the transmission are important influences on
transmission performance, reliability, and durability. DEXRON
®
-III fluids are
recommended for on-highway applications. Type C-4 fluids are recommended
for severe duty and off-highway applications.
NOTE:
The fluid level rises as the temperature increases. To ensure
an accurate check, operate the transmission until the sump fluid
temperature is 160–200°F (71–93°C); converter-out temperature is
180–220°F (82–104°C).
˙
CAUTION
: Containers or fillers that have been used to handle any
antifreeze or engine coolant solution must not be used for
transmission fluid. Antifreeze and coolant solutions contain ethylene
glycol which, if introduced into the transmission, can cause the clutch
plates to fail.
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