WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
445
2007 W Series Chassis
WSM082106
ocedure
Yes
No
?
Go to Torque
Converter
Diagnosis
Procedure
System OK
TRANSMISSION FLUID CHECKING
Cold Fluid Check
The purpose of the cold check is to determine if the
transmission has enough fl uid to be operated safely until
a hot check can be made.
IMPORTANT:
The fluid level rises as fluid temperature increases. DO
The fluid level rises as fluid temperature increases. DO
NOT fill above the COLD CHECK band if the transmis-
NOT fill above the COLD CHECK band if the transmis-
sion fluid is below normal operating temperatures.
sion fluid is below normal operating temperatures.
Bring the vehicle to a complete stop on a level surface
using the service brakes.
1. Ensure that the engine is at low idle RPM (500-800
RPM).
2. With the service brakes applied, put the transmission
in the P, PARK, position.
3. Engage the park pawl by slowly releasing the service
brakes. The vehicle may move slightly as the pawl
engages.
4. Apply the parking brake and ensure it is properly
engaged.
5. Run the engine for at least one minute. Apply the
service brakes and shift to D, DRIVE, then to N,
NEUTRAL, and then shift to R, REVERSE, in order to
fi ll the hydraulic system.
6. Ensure that the engine is at low idle RPM (500-800
RPM).
7. With the service brakes applied, put the transmission
in the P, PARK, position.
8. Engage the park pawl by slowly releasing the service
brakes. The vehicle may move slightly as the pawl
engages.
9. With the engine running, remove the fl uid level
indicator from the fi ll tube and wipe the indicator clean.
IMPORTANT:
• If the fl uid level is within the COLD CHECK
band, the transmission may be operated
until the fl uid is hot enough to perform a
HOT RUN check. If the fl uid level is not
within the COLD CHECK band, add or
drain as necessary to bring it to the middle
of the COLD CHECK band.
• Always check the fl uid level at least twice
using the procedure described above.
Consistent readings are important in
order to maintaining proper fl uid level. If
inconsistent readings persist, inspect the
transmission vent assembly to be sure
that it is clean and unclogged. If readings
are still inconsistent, contact your nearest
Allison distribution or dealer.
Insert the fl uid level indicator into the fi ll tube and
remove. Check the fl uid level reading. Repeat the check
procedure to verify the reading.
10. Perform a hot check at the fi rst opportunity after the
normal operating sump temperature of 71-93°C (160-
200°F) is reached.
