The HEST Lamp will illuminate and ash during the
regeneration process. (Table 4-3, Page 4-9) When
regeneration is complete, the engine will return to
normal idle speed and the HEST lamp will disappear.
DO NOT TURN OFF THE ENGINE,
ATTEMPT TO OPERATE THE UNIT, CHANGE ENGINE
RPM OR MOVE FROM PARK TO NEUTRAL WHILE
REGENERATION IS OCCURRING. This will abort the
regeneration process and require you to start the
process over.
EXHAUST TEMPERATURES WILL BE
EXTREMELY HIGH. BE SURE EXHAUST WILL NOT
COME INTO CONTACT WITH ANY FLAMMABLE OR
COMBUSTIBLE MATERIALS.
Regeneration Auto
The Regen Auto screen is the default screen
when navigating the Tier 4 as the system is set to
automatically regenerate when needed. (Figure 4-20)
Figure 4-20. Regen Auto Screen
Regen Request
To initiate the regeneration process, use the DOWN soft
key to select Regen Request and follow the procedure
below. (Figure 4-21)
Figure 4-21. Regen Request
BEFORE initiating the regeneration process:
1. Park the machine in a safe location where
the exhaust pipe does not face ammable or
combustible materials.
2. Engage the park brake and place the transmission
in either Park or Neutral.
3. With the engine running at IDLE speed, press the
Request Regen soft key to initiate the regeneration
process. (Figure 4-21) The HEST lamp will
illuminate.
4. Allow the regeneration process to proceed,
monitoring the machine and surrounding area for
safety.
NOTE: If you must stop the regeneration process,
DO NOT turn the engine off while
regeneration is in process. The Request
Regen soft key changes to Cancel Regen
once regeneration begins. Simply push
the (fourth) button under “Cancel Regen”
to communicate with the engine that
regeneration is unwanted or unsafe at this
time. Perform the regeneration process as
soon as possible.
4
Operation
LeeBoy 685D Motor Grader 4-15
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