WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
477
2007 W Series Chassis
WSM082106
LOW LUBRICATION PRESSURE
Condition
Action
Incorrect fluid level
Correct the fluid level. Refer to Transmission Fluid Checking Procedure.
Plugged suction filter
Clean or replace the oil suction filter. Refer to Oil Pan Replacement.
Plugged control main filter
Replace the filter.
Excessive internal fluid leakage
• Inspect other pressures. Refer to Low Main Line Pressure in All Ranges
and Low Main Line Pressure in specifi c Ranges, Normal Pressure in
Other Ranges.
• Inspect the control module mounting bolts.
• Inspect the lubrication valve and spring.
• Inspect the converter housing to separator plate gasket.
Cooler lines restricted or leaking
Inspect for kinks and leakage. Reroute or replace lines as necessary.
Lubrication regulator valve sticking
Clean or replace the regulator valve.
Converter relief valve sticking
Clean or replace the converter relief valve.
Cooler plugged
Clean or replace the cooler.
Faulty gage
Repair or replace the gage.
CONTAMINATED TRANSMISSION FLUID
Condition
Action
Failure to change fluid and filters
Change the fluid and install new filters. Refer to Automatic Transmission
Fluid/Filter Replacement.
Excessive heat
Inspect the cooling system for restrictions and proper capacity.
Substandard fluid
Use recommended fluid. Refer to Transmission General Specifications.
Clutch/transmission failure
Overhaul the transmission.
