Komatsu WA270-3H Operation & Maintenance Manual page 48

Wheel loader
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Safety Measures During Maintenance
PRIOR TO START OF INSPECTION AND MAINTENANCE
Prior to start of inspection and maintenance operations, park the machine
on solid, even ground. Lower the work unit. Switch off the engine (start
switch to position '0') and safeguard the machine.
If the engine has to be running during maintenance, e.g. for pressure
checks of the hydraulic system, proceed with particular care. Carry out
such measures with two persons with whom you have arranged clear
hand signs beforehand.
One person must be seated on the driver's seat to ensure that the engine
can be immediately switched off, if required. This person must always
ask the second person before actuating the control levers.
The person performing the maintenance measures must take care not
to touch or get caught by moving parts.
SECURING THE ARTICULATED STEERING
Before starting maintenance, secure the articulated steering against
accidental movement using the locking bar (position '2').
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