Komatsu WA250PT-5H, Operation & Maintenance Manual

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Precautions for maintenance
SAFETY
Safety instructions
2-32
Working under the raised boom 0.
WARNING
Danger of injury! The raised boom may suddenly fall! For
safety reasons, a raised boom must be secured against
dropping before you pass or stand under it.
The boom must be secured against moving if any work is to
be carried out under it when it is in a raised position. For this
purpose you should use a supporting prop (1) which is to be
positioned below the boom.
Park the machine on level, solid ground.
Apply the parking brake.
Place wheel chocks in front of the wheels to prevent the
machine from inadvertently rolling away.
Lift the arm far enough to allow the supporting prop to be
placed beneath the boom.
Switch off the engine.
With the engine switched off, lower the boom slowly until it
rests on the supporting prop.
Set the control lever to "NEUTRAL" and secure it with the
safety lever (2) (locked).
9EA04401A
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