.
MAINTENANCE
OUTLINE OF SERVICE
HANDLING HYDRAULIC SYSTEM
The hydraulic equipment is at high temperature during operations and after operations. In addition, during
operations, it is also under high pressure, so when carrying out inspection or maintenance of the hydraulic related
equipment, be careful of the following when carrying out the operation.
Stop the machine on flat ground, lower the work equipment completely to the ground, and set so there is no
pressure on the cylinder circuit.
Always stop the engine.
Immediately after operations, the hydraulic oil and lubricating oil are at high temperature and high pressure,
so wait for the temperature of the oil at all parts to go down before starting maintenance.
Even when the temperature goes down, the system may be under internal pressure, so when loosening plugs
or screws or when loosening hose joints, do not stand right in front. Loosen the parts slowly to release the
internal pressure before removing.
When carrying out inspection and maintenance of the hydraulic circuit always release the air from the
hydraulic tank to remove the internal pressure.
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.
The accumulator is charged with high-pressure nitrogen gas, and it is extremely dangerous if it is handled
incorrectly. For details of the method of handling, see "CHECK ACCUMULATOR (FOR CONTROL CIRCUIT)
(PAGE 4-78)".
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