Komatsu GD555-5 Operation & Maintenance Manual page 89

OPERATION
EXPLANATION OF COMPONENTS
STARTING SWITCH
Starting switch (1) is used to start or stop the engine.
(A): OFF position
The key can be inserted or withdrawn. Switches for the electrical
system (except room lamp), are all turned off and the engine is
stopped.
(B): ON position
Electric current flows through the charging and lamp circuits. Keep
starting switch key in ON position while the engine is running.
In cold weather, if the starting switch is turned to the ON position (B), preheating is automatically started and the
engine preheating pilot lamp lights up. After the preheating is completed, the engine preheating pilot lamp goes out.
The time that the engine preheating pilot lamp stays lighted up depends on the ambient temperature as shown in
the table below.
Ambient temperature Lighting time
Above -4 ° C
0 seconds
5 seconds to 30
-4 ° C to -15 ° C
seconds
Below -15 ° C
30 seconds
(C): START position
This is the engine-start position. Keep the key at this position during cranking. Immediately after starting the engine,
release the key. It will automatically return to the ON position (B).
(D): HEAT position
Set to this position when starting the engine manually in cold weather.
When turning the key to the HEAT position (D), the engine preheating pilot lamp lights up. As the key returns
automatically to the OFF position (A) when released, immediately turn to the START position (C) to start the engine.
Hold the key in the HEAT position (D) within 5 to 30 seconds only.
REMARK
When turning the key to B (ON) position at cold seasons, engine pre-heating starts automatically. As the necessity
of automatic pre-heating is judged by the outdoor air temperature, starting the engine is sometimes difficult if the
engine is colder than the outdoor temperature. Only in such case, turn the key to D (HEAT) position and manually
preheat.
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