Komatsu D475A-5E0 Operation & Maintenance Manual page 43

PRECAUTIONS FOR MAINTENANCE
STOP ENGINE BEFORE PERFORMING INSPECTION AND MAINTENANCE
Lower the work equipment completely to the ground and stop
the engine before performing any inspection and maintenance.
Turn the starting switch to ON position, operate the blade control
lever to RAISE and LOWER position 2 or 3 times repeatedly to
release the remaining pressure in the hydraulic circuit, then set
parking brake lever (1) and work equipment lock lever (2) to
LOCK position (L).
Check that the battery relay is off and main power is not
conducted. (Wait for approximately 1 minute after turning off the
engine starting switch key and press the horn switch. If the horn
does not sound, it is not activated.)
Put blocks under the track to prevent the machine from moving.
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SAFETY