DEF Dosing Unit Filter
The DEF dosing unit lter prevents foreign objects that
may be suspended in the DEF from entering the dosing
system, which draws DEF from the tank, pressurizes
it, and delivers the DEF through a dosing valve. Any
unused DEF is then routed back to the tank. The DEF
dosing unit lter should be replaced every 4500 hours
or three years, whichever comes rst. It is located on
the left inside the rear access panel on the driver’s side.
Follow these procedures to replace the dosing unit lter:
1. Follow Steps 1 - 4 on Page 5-18 to prepare machine
for DEF system maintenance.
2. Place a container under the DEF dosing unit as a
small amount of DEF may drain from the lines when
disconnected. (Dispose of the uid in accordance
with environmental regulations.)
3. Use a clean, damp cloth to wipe the unit to reduce
the risk of contamination entering the DEF system.
Debris can cause permanent damage and
premature failure in the DEF dosing unit.
4. Unscrew the DEF lter cap and remove the
equalizing element and lter element. (Figure 5-17)
Figure 5-17. DEF Dosing Unit Filter
1 - Filter Cap
2 - Filter Equalizing Element
3 - Filter Element
5. Discard both the lter element and equalizing
element in accordance with environmental
regulations.
6. Reinstall the new lter and equalizing element.
7. Reinstall and tighten the cap.
NOTE: Lubrication on the DEF lter O-ring is not
required.
FUEL SYSTEM
The fuel level is indicated on the PV485 digital
display component on the steering column. Proper
maintenance of the fuel system ensures top
performance and prevents damage to internal engine
components. The fuel ller cap and fuel lter are located
just inside the right engine access panel. (Figure 5-18)
The fuel water separator component is also located at
the right engine access door.
Figure 5-18. Fuel Filler Cap and Fuel Filter
NOTE: Fill the tank to FULL before storing the
motor grader overnight to reduce moisture
accumulation from condensation in the tank. Fuel
contaminated by water promotes the growth of
microbes that can clog fuel lters and lines over
time.
The operator should NEVER be on or
near the motor grader while fuel is being added. NO
SMOKING while lling the fuel tank as all fuels for
internal combustion engines are ammable. Fill the
fuel tank only in a designated area where there is
good ventilation and a re extinguisher available.
NEVER ll the tank, check fuel level
or check for fuel leaks near an open ame or near
equipment that can create sparks.
Diesel fuel is very ammable. Use
extra caution and DO NOT spill fuel. DO NOT change
the fuel lter while the motor grader is running. DO
NOT change the fuel lter in an area near an open
ame. DO NOT smoke while changing the fuel lter.
NEVER loosen a fuel injector line as
contents are under high pressure. DO NOT try to
bleed air by loosening injector lines.
5
Maintenance
LeeBoy 685D Motor Grader 5-19
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