WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
446
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
Hot Fluid Check
IMPORTANT:
The fluid must be hot to ensure an accurate check. The
The fluid must be hot to ensure an accurate check. The
fluid level rises as temperature increases.
fluid level rises as temperature increases.
Operate the transmission in D, DRIVE, range until
normal operating temperature is reached. Normal
operating temperature is any of the following:
• Sump temperature 71-93°C (160-200°F)
• Converter-out temperature 82-104°C (180-220°F)
• If a transmission temperature gage is not present, check
the fl uid level when the engine water temperature gage
has stabilized and the transmission has been operated
under load for at least one hour.
1. Bring the vehicle to a complete stop on a level surface
using the service brake.
2. Ensure that the engine is at low idle RPM, 500-800
RPM.
3. With the service brakes applied, place the
transmission in the P, PARK, position.
4. Engage the park pawl by slowly releasing the service
brakes. The vehicle may move slightly as the pawl
engages.
5. Apply the parking brake and ensure it is properly
engaged.
6. With the engine running, remove the fl uid level
indicator from the fi ll tube and wipe the indicator clean.
IMPORTANT:
Always check the fluid level at least twice using the
Always check the fluid level at least twice using the
procedure described above. Consistent readings are
procedure described above. Consistent readings are
important to maintaining proper fluid level. If inconsis-
important to maintaining proper fluid level. If inconsis-
tent readings persist, inspect the transmission vent
tent readings persist, inspect the transmission vent
assembly to be sure it is clean and unclogged. If read-
assembly to be sure it is clean and unclogged. If read-
ings are still inconsistent, contact your nearest Allison
ings are still inconsistent, contact your nearest Allison
distribution or dealer.
distribution or dealer.
Insert the fl uid level indicator into fi ll the tube and
remove. Check fl uid level reading. Repeat the check
procedure to verify the reading.
IMPORTANT:
Safe operating level is within the HOT RUN band on the
Safe operating level is within the HOT RUN band on the
fluid level indicator. The width of the HOT RUN band
fluid level indicator. The width of the HOT RUN band
represents approximately 1.0 liter (1.06 quarts) of fluid
represents approximately 1.0 liter (1.06 quarts) of fluid
at normal operating sump temperature.
at normal operating sump temperature.
If the fl uid level is not within the HOT RUN band, add or
drain as necessary to bring the fl uid level to within the
HOT RUN band.
Fluid Inspection
IMPORTANT
Transmission fluid must be changed whenever there is
Transmission fluid must be changed whenever there is
evidence of dirt or a high temperature condition. High
evidence of dirt or a high temperature condition. High
temperature causes the transmission fluid to be discol-
temperature causes the transmission fluid to be discol-
ored or to have a strong odor. Local conditions, severity
ored or to have a strong odor. Local conditions, severity
of operation, or duty cycle may require more or less fre-
of operation, or duty cycle may require more or less fre-
quent fluid or filter change intervals.
quent fluid or filter change intervals.
Examine the drained fl uid for evidence of dirt.
IMPORTANT:
Cooler water may be contaminated by engine oil if an
Cooler water may be contaminated by engine oil if an
engine oil cooler is present; be sure to locate the cor-
engine oil cooler is present; be sure to locate the cor-
rect source of cooler water contamination.
rect source of cooler water contamination.
