DEF Tank
Filler Cap
Figure 5-15. DEF Tank
NOTE: Check the ttings around the DEF tank
header for leaks or any signs of damage
regularly. DEF leaks will leave a white
deposit around the ttings.
Typically, machines will consume DEF uid equal to
2 - 10 percent of the fuel you burn. Temperature and
humidity affect DEF consumption, with hot and dry
climates resulting in greater DEF consumption. DEF
freezes at 12° F (-11° C), and should be stored 40 - 80°
F (5 - 27° C) to maintain shelf life. Temperatures above
86°F (30° C) causes DEF to break down into ammonia,
reducing shelf life considerably.
DEF may be stored in the machine’s tank up to four
months at the recommended temperature. Keep
container tightly closed and sealed until ready for use.
Always keep the DEF tank full.
DO NOT use DEF after its expiration
date. Always dispose of DEF in compliance with
federal and local environmental laws.
• Store DEF in a well-sealed container in a well-
ventilated location away from dust and direct sunlight.
• Keep DEF containers away from fuel and lubricant
containers, and any other source of contamination.
• Store DEF in a dedicated container that has not been
used with other fluids, including funnels and hoses. If
using pumps, ensure the seals, O-rings and fittings on
the dispenser is DEF-compatible.
• Always clean around the fill neck and dispensing
nozzle when refilling the DEF tank. If you’re refilling
the DEF tank often, the opportunity for airborne dust
and dirt ingestion is high.
• Be especially careful handling DEF at the job site.
While it’s a good idea to have DEF on hand, especially
in rural areas, the risk of contamination is higher. Be
sure the ambient temperature is within the correct
storage range if bringing DEF to the work site.
A sensor on the DEF tank header monitors the level,
temperature and quality of DEF in the tank. The header
is mounted on top of the DEF tank and provides ltered
DEF supply from the tank to the after treatment DEF
dosing unit. Both the DEF tank header and dosing
unit have serviceable lters that require cleaning or
replacement. (Figure 5-16)
1
2
3
4
Figure 5-16. DEF Tank Header Assembly
1 - Suction DEF Connector
2 - DEF Connector
3 - Coolant Connectors
4 - Electrical Connector
5
Maintenance
LeeBoy 685D Motor Grader 5-17
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