Komatsu PC1250-11 Original Instructions Manual page 238

MACHINE OPERATIONS AND CONTROLS
Restart the engine after stopping according to the following procedure.
1.
Turn the top of the engine emergency shut down switch
(S) clockwise.
The switch protrudes a little and it returns to OFF (normal
operation) position (b). At this time, check that the indicator
lamp (L) in cab is not lit.
2.
Turn the starting switch key to ON position (B).
3.
Start the engine.
REMARK
If the engine is stopped by the operation of engine emergency shut down switch, air bleeding from fuel circuit is
not necessary.
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OPERATION