LeeBoy 685D - DEF Tank Filter

The DEF system will automatically purge the uid
from the system after shutting down the machine and
requires no intervention from the operator.
Before servicing any component in the DEF system,
allow the DEF system to purge. You will hear the
pumping noise as the system completes the purge cycle
automatically after shutting down the engine.
1. Shift transmission into neutral.
2. Apply the parking brake.
3. Shut off the engine. Wait at least ve minutes after
shutting down the engine for the after treatment DEF
dosing unit to complete its automatic purge cycle.
DO NOT disconnect battery until the
purge cycle has completed to prevent damage to the
unit.
4. Place battery master switch in the OFF position.
(Page 5-21)
It’s important to service the DEF
system in a clean, dust-free environment to prevent
contamination in the DEF tank that can damage the
after treatment DEF dosing unit.
DEF Tank Filter
The DEF tank lter should be cleaned or replaced every
2000 hours, or every two years, whichever is rst. The
lter is the rst point of contact with foreign elements.
To clean or replace the DEF tank lter, remove the DEF
header tank assembly using the following procedures.
The DEF lines are connected using quick-release
ttings and must be disconnected in the order
described below. (Figure 5-16)
Wear eye protection, gloves and
appropriate protective clothing to avoid injury. The
coolant lines connect to the after treatment dosing
unit are hot and under pressure. DO NOT disconnect
while the engine is running or before the system has
purged and cooled down after shutting down the
engine. Disconnecting the coolant lines before the
system cools down may cause coolant to spray and
burn skin on contact.
NOTE: It is imperative that you disconnect the
plumbing from the header in the exact order
described below to prevent accidental DEF
contamination of the electrical connector.
To service the DEF tank lter inside the header (Figure
5-16):
1. Complete Steps 1 - 4 to prepare machine for DEF
system maintenance.
2. Place a container under the DEF tank as a small
amount of DEF may drain from the coolant lines
when disconnected. (Dispose of the uid in
accordance with environmental regulations.) DO
NOT ush the coolant.
3. Use a clean, damp cloth to wipe the unit to reduce
the risk of contamination entering the DEF tank.
Wipe away any spilled DEF while servicing the DEF
tank lter.
4. Disconnect the coolant connectors and cap the
lines to prevent contamination or DEF leakage.
Figure 5-16) (You can also use a pair of coolant
hose pinch-off pliers to clamp the lines. Make sure
the tank coolant hose material is exible enough.)
DO NOT drain the cooling system. DO NOT spill any
coolant into the DEF tank.
5. Disconnect the DEF connector.
6. Disconnect the suction DEF connector.
7. Disconnect the back-ow DEF connector.
8. Disconnect the electrical connector by pressing the
top of the tting.
9. Remove the header from the tank by removing the
six bolts on the metal ring separating the header
from the tank. Slowly and carefully lift the header
out of the DEF tank, exposing the lter unit, to avoid
damaging the lter or other components.
10. Remove the clip, pull the lter cartridge out and
inspect for cracks, damage and contamination
or debris. Clean the lter and reinsert, unless
replacing the lter at service interval or if debris or
damage is evident:
• Discard the lter element and O-ring in
accordance with environmental regulations and
replace with a new lter element.
• Also inspect the after-treatment DEF dosing unit
lter after replacing the tank lter. (Figure 5-17)
11. Lubricate the O-rings with clean DEF uid and install
the new lter element (O-ring side facing outward) in
its seated notch location.
12. Reinstall the lter cartridge into the DEF tank.
13. Reinstall the tank lter header in reverse order
Maintenance
LeeBoy 685D Motor Grader5-18