Komatsu WA800-3E0, Operation & Maintenance Manual

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PRECAUTIONS FOR MAINTENANCE
SAFETY
2-38
PRECAUTIONS WITH HIGH-PRESSURE OIL
The hydraulic system is always under internal pressure. In addition, the fuel piping is also under internal pressure
when the engine is running and immediately after the engine is stopped. When carrying out inspection or replace-
ment of the piping or hoses, check that the internal pressure in the circuit has been released. If this is not done, it
may lead to serious personal injury. Always do as follows.
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When carrying out inspection and maintenance of the pres-
sure, release the pressure before starting. For details, see
“STOP ENGINE BEFORE CARRYING OUT MAINTE-
NANCE (2-33)“. Do not carry out inspection or replace-
ment work with the circuit under pressure.
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If there is any leakage from the piping or hoses, the sur-
rounding area will be wet, so check for cracks in the piping
and hoses and for swelling in the hoses.
When carry out inspection, wear safety glasses and leather
gloves.
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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
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.
HANDLING HIGH-PRESSURE HOSES
If oil or fuel leaks from high-pressure hoses, there is danger that it may cause fire or defective operation, which
may lead to serious injury or fire. If there are any loose hoses or piping, or any leakage of oil or fuel from the hose
or piping mount, stop operation and tighten to the specified torque.
If any hoses or pipes are damaged or deformed, please contact your Komatsu distributor.
Replace the hose if any of the following problems are found.
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Damaged or leaking hydraulic fitting.
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Frayed or cut covering or exposed reinforcement wire layer.
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Covering swollen in places.
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Twisted or crushed movable portion.
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Foreign material embedded in covering.