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OPERATION
5-24.3 Diesel Exhaust Fluid (DEF) - 2010 EPA Engines and Beyond
NOTE: Refer to “Diesel Exhaust Fluid (DEF)”, Group 0360-P-008 in the vehicle service manual for
additional information on DEF fluid handling and storage.
Acceptable DEF fluid used shall meet ISO 22241-1 or DIN 70700 specifications. DEF fluid should be stored at
temperatures between 10°F - 90°F and should have a minimum shelf life of 12 months when stored and handled in
proper conditions.
Figure 5-2: Typical DEF Reservoir Location
The Diesel Exhaust Fluid reservoir is typically located in the driver's side rear wheel fender behind the forward air
bottle storage door. The DEF reservoir location on your apparatus may be different, depending on the rear body
design. The reservoir has a blue cap and is accompanied by a DEF fluid only label.
In the event that the incorrect fluid has been added to the DEF tank, such as, but not limited to:
•Water
• Diesel Fuel
• Hydraulic Fluid
• Coolant
• Windshield Washer Fluid
Contact Pierce Customer Service to determine the appropriate repair action.
If only water has been added to the DEF tank, drain the DEF tank, flush with distilled water and refill with new and/
or known good DEF.
DEF will freeze around 11°F (-12°C). The DEF system on the vehicle is designed to accommodate this and does
not require any intervention from the operator.
Filling the DEF tank with other liquids can result in premature failure of the engine and/or emissions
components.
Do NOT add any chemicals/additives to the DEF in an effort to prevent freezing. If chemicals/additives
are added to the DEF, the aftertreatment system may be damaged.
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