Precautions for High-Pressure Liquids SAFETY When you stop the machine at the end of a job, remember that the engine coolant, oil, all engine parts, exhaust stack, and the hydraulic system are still hot and under pressure. If you attempt to drain hydraulic fluid or engine oil under these conditions, you expose yourself to various dangers, including the risk of serious burns. Perform maintenance procedures described in this manual only when the machine has had time to cool down. 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. Never loosen a fuel injector line while the engine is running. Severe injury may result from the high-pressure fuel spray. Precautions for 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 replacement 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 or death. Always do the follows actions: Do not carry out inspection or replacement work with the circuit under pressure. Always release the pressure before starting. For details, see “Stopping Machine During Maintenance” on page 1-36. If there is any leakage from the piping or hoses, the surrounding area will be wet. Check for cracks in the piping and hoses and for swelling in the hoses. When carrying 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 loss of sight if it contacts your skin or eyes directly.
If you are hit by a jet of high-pressure oil and suffer injury to your skin or eyes, wash the place with clean water and consult a doctor immediately for medical attention. The pressure in the ECSS circuit is stored by an accumulator. Do not remove the ECSS piping or components. If it is necessary to remove these, ask your Komatsu distributor to carry out the removal operation. WA380-6 1-43