Handling Hydraulic System - Komatsu PC18MR-3 Operation & Maintenance Manual

OUTLINE OF SERVICE

HANDLING HYDRAULIC SYSTEM

Hydraulic equipment is at a high temperature during operations and immediately after operations. During
operations, it is also under high pressure, so be careful of the following points when carrying out inspection and
maintenance of hydraulic-related equipment.
Stop the machine on level ground, lower the bucket completely to the ground, and set so that there is no
pressure on the cylinder circuits.
Always stop the engine.
Immediately after the engine is stopped, the hydraulic oil and lubricants are at a high temperature and high
pressure. Wait for the temperature to go down before starting the maintenance operation.
Even when the temperature goes down, the circuits may be under internal pressure, so when loosening plugs,
screws, or hose connections, do not stand directly in front. Loosen gradually to release the internal pressure
before removing.
Always release the air in the hydraulic tank to remove the internal pressure before carrying out inspection and
maintenance of the hydraulic circuit.
Inspection and maintenance include checking the hydraulic system for oil level, replacement of filter elements
and replacement of hydraulic oil.
If high-pressure hoses have been removed, check that there is no damage to the O-rings. If any damage is found,
replace the O-ring.
It is necessary to bleed the air from the circuits when the hydraulic filter element or strainer have been replaced
or washed, or when hydraulic equipment has been repaired or replaced, or when the hydraulic piping has been
removed.
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MAINTENANCE