SAFETY High-Pressure Precautions 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. Do not carry out any inspection or replacement work when the hydraulic system is under pressure. Always release the pressure before starting. For details, see “Stopping Engine During Inspection and Maintenance” on page 1-42.
On machines equipped with an ECSS system, 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 them, ask your Komatsu distributor to carry out the removal operation. Precautions for High-Pressure Oil 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 danger that high-pressure oil leaking from small holes may penetrate your skin or cause blindness if it contacts your eyes directly.
If you are hit by a jet of high-pressure oil and suffer injury to your skin or eyes, wash the area with clean water and consult a doctor immediately for medical attention. Safe Handling of High-Pressure Hoses If oil or fuel leaks from high-pressure hoses, it may cause fire or defective operation which may lead to serious injury or death. If hose or piping mounts are loose or fuel is leaking from the mount, stop operations and tighten to the specified torque. If any damaged or deformed hoses or piping are found, stop operations immediately and contact your Komatsu distributor. Replace the hose if any of the following problems are found:
Damaged hose or deformed hydraulic fitting Frayed or cut covering or exposed reinforcement wire layer Covering swollen in places Twisted or crushed movable portion Foreign material embedded in covering Precautions for High-Pressure Fuel When the engine is running, high pressure is generated in the engine fuel piping. When carrying out inspection or maintenance of the fuel piping system, stop the engine and wait for at least 30 seconds to allow the internal pressure to 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. 1-48 WA430-6