WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
471
2007 W Series Chassis
WSM082106
FLOW CHECK
1. Disconnect both hoses from the oil cooler pipes.
Connect the oil cooler feed pipe, bottom connector,
to the transmission. Connect the return pipe, top
connector, to the discharge hose (5). This will require
the use of J-44835-1 . Clip the discharge hose (5) onto
an empty oil drain container.
2. Confi rm the transmission is fi lled with automatic
transmission fl uid.
3. Start the engine with the transmission in PARK range
and run for 5 seconds at 2,400 RPM. A minimum of 2.2
L (2.3 quarts) must be discharged during this 5 second
run time.
• If fl uid fl ow is greater than 2.2 L (2.3 quarts) in 5
seconds at 2,400 RPM, go to step 4.
• If fl uid fl ow is less than 2.2 L (2.3 quarts) in 5
seconds at 2,400 RPM, perform the following
diagnosis: Disconnect the oil cooler feed line at
the radiator. Connect the discharge hose (5) to the
cooler feed line. Clip the discharge hose (5) to the
empty oil drain container. Start the engine with the
transmission in PARK range and run for 5 seconds
at 2,400 RPM. A minimum of 2.2 L (2.3 quarts) must
be discharged during this 5 second run time at 2,400
RPM. Do the following according to the fl ow rate:
• Insuffi cient feed fl ow: Inspect the transmission.
• Suffi cient feed fl ow: Inspect the oil cooler return
pipe, the oil cooler located in the radiator, and the
auxiliary oil cooler.
4. Remove the discharge hose (5), connect the cooler
feed and return pipes to the transmission and fi ll the
unit to the proper fl uid level. Inspect the transmission
oil cooler pipe connections at the radiator, the auxiliary
cooler and the transmission for leaks.
CLEAN-UP
1. Disconnect the water supply hose (7) from the J
35944-A and bleed any remaining air pressure from
the fl usher tank (4).
2. Remove the fi ll cap (9) from the J 35944-A and return
any unused fl ushing solution to its container. Rinse the
J 35944-A with water. Do not store the J 35944-A with
fl ushing solution in it.
3. After every third use, clean the J 35944-A as described
in the instructions included with the tool.
