Hitachi ZW 550-6 Operator's Manual page 70

Repeated Inhibiting of Aftertreatment Device Cleaning
IMPORTANT: When the machine is operated without
performing manual regeneration, the aftertreatment
device may be damaged. Immediately move
the machine to a safe area and perform manual
regeneration.
 If auto-regeneration is inhibited or interrupted, the
following auto-regeneration will be accompanied by the
aftertreatment device manual regeneration request. It
is required to perform manual regeneration as soon as
requested.
f
NOTE: The manual regeneration request indicator remains
ON until a regeneration process completes successfully.
 When leaving machine without running aftertreatment
device regeneration, gradual derate will be applied to the
engine (refer to 1-36).
If manual regeneration does not work, call your local
authorized dealer to repair the aftertreatment device.
 When SCR system errors are accompanied, take required
action immediately (refer to 1-33).
OPERATOR'S STATION
1-6