ENGINE MAINTENANCE PREVENTIVE MAINTENANCE
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Regional Haul (R05/10)
Deisel Exhaust Fluid Tank
Vehicles that comply with 2010 EPA emission require-
ments will have a Deisel Exhaust Fluid (DEF) tank
mounted to the vehicle frame. During normal operating
situations, your vehicle may consume DEF at a rate of 3%
per gallon of diesel consumed. The DEF tank has been
designed to hold a minimum of 6% of the diesel fuel your
vehicle is designed to carry.
DEF filter
The DEF system has a supply pump filter and this filter
should be serviced according to the preventive mainte-
nance schedule. Follow these steps to replace the DEF
supply pump filter:
1. Turn off the vehicle and allow the vehicle to cool
down. Take special precaution with hot exhaust pip-
ing.
Aftertreat-
ment Sys-
tem
Diesel Particulate Filter Clean Filter.
Refer to the engine
maintenance manual
Diesel Exhaust Fluid Tank Check fittings for abrasion damage, leaks, tightness and fully
engaged connectors
X
Diesel Exhaust Fluid Supply
Module
Replace Filter (See following section)
X
