WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
475
2007 W Series Chassis
WSM082106
FLUID LEAKS FROM TRANSMISSION OUTPUT
Condition
Action
Faulty or missing seal at output flange/yoke
Install a new seal assembly in the transmission rear cover. Refer to Seal
Replacement - Rear Propshaft
Machine lead on output flange/yoke seal surface
Replace the flange/yoke. Refer to Output Flange/Yoke Replacement.
Rear cover porosity
Repair or replace the cover.
Flange/yoke worn at seal surface
Replace the flange/yoke. Refer to Output Flange/Yoke Replacement.
Insufficient sealant around seal OD
Install a new seal assembly in the transmission rear cover. Refer to Seal
Replacement - Rear Propshaft.
Damaged or missing output bolt washer seal
Replace the output bolt sealing washer. Refer to Output Flange/Yoke
Replacement.
Damaged, missing, or loose output flange bolt
Replace and/or torque the output flange bolt. Refer to Output Flange/Yoke
Replacement.
INTERMITTENT BUZZING NOISE
Condition
Action
Low fluid level
Add fluid to the proper level. Refer to Transmission Fluid Checking
Procedure.
Air leak in oil suction filter canister
Replace the oil suction filter. Refer to Oil Pan Replacement .
Clogged suction filter
Replace the filter. Refer to Oil Pan Replacement .
Aerated fluid causes noisy pump
Correct the fluid level. Refer to Transmission Fluid Checking Procedure .
Low main pressure causes main regulator valve to oscillate
Refer to Low Main Line Pressure in All Ranges and Low Main Line Pressure
in specific Ranges, Normal Pressure in Other Ranges .
