Komatsu WA250PT-5H, Operation & Maintenance Manual

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SAFETY
Precautions for maintenance
Safety instructions
2-33
Precautions when using hammer 0.
When using a hammer, pins may fly out or metal particles may
be scattered. This may lead to serious injury. Always do as
follows.
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.
When hitting pins or bucket teeth, there is a hazard that bro-
ken pieces might be sent flying and injure people in the sur-
rounding area. Always check that there is no one in the
surrounding area.
There is a hazard that the pin hit with strong force may fly
out and injure people in the surrounding area.
Repair welding 0.
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 0.
When repairing the electrical system or when carrying out electrical welding, remove the negative (-) terminal of
the battery to prevent the flow of current.
Precautions with high-pressure oil 0.
The hydraulic system is always under internal pressure. When inspecting or replacing piping or hoses, always
check that the pressure in the hydraulic circuit has been released. If the circuit is still under pressure, it will lead to
serious injury, so always do as follows.
When carrying out inspection and maintenance of the pressure, release the pressure before starting. For
details, see “Maintenance with engine running on page 2-29“. Do not carry out inspection or replacement work
with the circuit under pressure.
If there is any leakage from the piping or hoses, the surrounding area will be wet, so check for cracks in the pip-
ing and hoses and for swelling in the hoses.
When carry out inspection, wear safety glasses and leather gloves.
There is a hazard that high-pressure oil leaking from small
holes may penetrate your skin or cause blindness if it con-
tacts your eyes directly. If you are hit by a jet of high-pres-
sure oil and suffer injury to your skin or eyes, wash the
place with clean water, and consult a doctor immediately for
medical attention.
Precautions for high-pressure fuel 0.
High pressure is generated inside the engine fuel piping when the engine is running. When carrying out inspection
or maintenance of the fuel piping system, wait for at least 30 seconds after stopping the engine to let the internal
pressure go down before starting inspection or maintenance.