Komatsu D31EX-21, Operation & Maintenance Manual, Page: 49 / 256

SAFETY
PRECAUTIONS FOR MAINTENANCE
2-31
WORK UNDER THE MACHINE
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If it is necessary to go under the work equipment or the
machine to carry out service and maintenance, support the
work equipment and machine securely with blocks and
stands strong enough to support the weight of the work
equipment and machine.
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It is extremely dangerous to work under the machine if the
track shoes are lifted off the ground and the machine is
supported only with the work equipment. If any of the con-
trol levers is touched by accident, or there is damage
occurring to the hydraulic piping, the work equipment or the
machine will suddenly drop. This is extremely dangerous.
Never work under the work equipment or the machine.
NOISE
If the noise from the machine is too loud, it may cause temporary or permanent hearing problems. When carrying
out maintenance of the engine and you are exposed to noise for long periods of time, wear ear covers or ear plugs
while working.
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.
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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.
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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.
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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.