Komatsu PC45MR-30403, Operation And Maintenance Manual, Page: 319 / 475

HANDLE HYDRAULIC COMPONENTS
• The hydraulic system is at high temperature during and just after operation. During operations, it is also un-
der high pressure, so when performing inspection and maintenance of hydraulic related equipment, be
careful of the following points.
• Stop the machine on a flat ground, lower the bucket to the ground, and perform the work so that there is no
pressure on the cylinder circuits.
• Always stop the engine.
• Immediately after stopping operations, the hydraulic oil and lubricating oil is at high temperature and high
pressure, so wait for the oil temperature to go down before starting maintenance.
• Even after the temperature has gone down, some parts may still be under internal pressure, so when loos-
ening plugs, bolts, or hose connections, do not stand directly in front of the parts, and loosen slowly to re-
lease the internal pressure before removing.
• When performing inspection and maintenance of the hydraulic circuit, always release the air in the hydraulic
tank to remove the internal pressure.
• The inspection and maintenance include check of the hydraulic oil level, replacement of filters, changing of
the hydraulic oil.
• When high-pressure hoses have been removed, check that there is no damage to O-rings. If any damage is
found, replace O-ring.
• When the hydraulic oil filter element or strainer is replaced or cleaned, or when a hydraulic component is
repaired, replaced, or its piping is removed, air in the circuit must be bled.
OUTLINE OF MAINTENANCE MAINTENANCE
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