Komatsu WA320-5H Operation & Maintenance Manual page 56

SAFETY
WORKING UNDER THE RAISED BOOM
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.
q 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.
q Park the machine on level, solid ground.
q Apply the parking brake.
q Place wheel chocks in front of the wheels to prevent the
machine from inadvertently rolling away.
q Lift the arm far enough to allow the supporting prop to be
placed beneath the boom.
q Switch off the engine.
q With the engine switched off, lower the boom slowly until it
rests on the supporting prop.
q Set the control lever to "NEUTRAL" and secure it with the
safety lever (2) (locked).
PRECAUTIONS WHEN USING HAMMER
When using a hammer, pins may fly out or metal particles may
be scattered. This may lead to serious injury. Always do as
follows.
q If hard metal parts such as pins, bucket teeth, cutting
edges, or bearings are hit with a hammer, there is a hazard
that pieces might be scattered and cause injury. Always
wear safety goggles and gloves.
q When hitting pins or bucket teeth, there is a hazard that
broken pieces might be sent flying and injure people in the
surrounding area. Always check that there is no one in the
surrounding area.
q There is a hazard that the pin hit with strong force may fly
out and injure people in the surrounding area.
REPAIR WELDING
Welding operations must always be carried out by a qualified welder and in a place equipped with proper equip-
ment. There is a hazard of gas, fire, or electrocution when carrying out welding, so never allow any unqualified
personnel to carry out welding.
REMOVING BATTERY TERMINAL
When repairing the electrical system or when carrying out electrical welding, remove the negative (-) terminal of
the battery to prevent the flow of current.
WARNING
PRECAUTIONS FOR MAINTENANCE
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