Hyundai HL930A, Operation & Maintenance Manual

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Manual exhaust system cleaning
Exhaust warning
lamp OFF HEST warning
lamp ON OFF
Exhaust warning
lamp blink HEST warning
lamp ON
Safety button
Manual exhaust system cleaning applies if the
machine is in a fireproof area.
To stop a manual exhaust system cleaning be-
fore it has completed, set to the exhaust sys-
tem cleaning switch to the inhibit position or
turn OFF the engine.
a
Stop and park the machine.
b
Pull the safety button and push the switch to posi-
tion
b
to initiate the manual exhaust system clean-
ing.
Refer to the 3-53 for the exhaust system
cleaning switch operation.
The engine speed may increase to
950~1050 rpm and exhaust system clean-
ing begins and it will take approximately
20~30 minutes.
c
The exhaust system cleaning warning lamp will
blink and HEST warning lamp will light ON during
the exhaust system cleaning is operating.
d
The exhaust system cleaning and/or HEST warn-
ing lamp will light OFF when the exhaust system
cleaning is completed.
(18) HEST (High exhaust system temperature) warning lamp
a
This warning lamp indicates, when illuminated, that exhaust tem-
peratures are high due to exhaust system cleaning.
b
The lamp will also illuminate during a manual exhaust system
cleaning.
c
When this lamp is illuminated, be sure the exhaust pipe outlet is not
directed at any surface or material that can melt, burn, or explode.
When this lamp is illuminated, the exhaust gas tempera-
ture could reach 800°C [1500°F], which is hot enough to
ignite or melt common materials, and to burn people.
The lamp does not signify the need for any kind of equip-
ment or engine service; It merely alerts the equipment
operator to high exhaust temperatures. It will be common
for the lamp to go on and off during normal equipment
operation as the engine completes exhaust system clean-
ing.
3-9