Precautions For Maintenance - Hitachi ZAXIS 210LC-3 Operator's Manual

PRECAUTIONS FOR MAINTENANCE

CAUTION:
• Never allow anyone to enter below the machine during maintenance.
• When aligning pin holes, never insert fingers into the pin holes.
• When using a hammer, wear protective equipment such as safety glasses and a hard hat. If flying debris
come in contact with eyes or any other part of the body, serious injury may result.
• Never enter under the machine when installing a pin.
• Service the hydraulic system only after the residual pressure in the system has been released and the tem-
perature of each component has cooled.
1. Operate each control lever several times to release the residual pressure from the boom, arm, grapple open/close,
swing, and pilot control (incl. the accumulator) circuits.
2. Bleed air from the hydraulic oil tank.
3. Immediately after operation, each component, hydraulic oil, and lubricants are hot and under pressure. Start
maintenance only after the oil and components have sufficiently cooled down. If the maintenance work is started
without allowing the oil and components to cool down, burns due to contact with hot component and/or escap-
ing oil, or injury due to contact with flying plugs or screws may result. Be careful that even after the temperature
has lowered, the residual pressure may still be remaining. When loosening the plugs or screws, do not stand di-
rectly in front of them. Slowly loosen and remove them after the residual pressure has been completely released.
4. Even after air is bled from the hydraulic oil tank, when the machine is on a slope, the machine weight will be ap-
plied to the travel and swing circuits so that the oil pressure in the swing and travel circuit increases. Therefore,
never service the machine on a slope.
IMPORTANT:
1. Be careful not to damage the mating surfaces of any hydraulic component, or do not allow foreign matter
such as dust to enter the hydraulic components.
1. Before installing hydraulic pipe lines, hoses, and oil tank, clean not only the mating surfaces but also their sur-
rounding areas. After completely removing the cleaning solvent, install them. Check that O-rings are completely
seated in the grooves without projecting outward.
2. Use an O-ring with no flaw. Be careful not to file the mating surface unintentionally. Do not twist a high pressure
hose when connecting it. If the hose is connected without correcting twisting, the service life of the hose will be-
come extremely short.
3. Tighten the hose connector fittings to the specified torque values. Refer to the Hydraulic Excavator Operator's
Manual for the specified tightening torque values.
2. Do not use hydraulic oil other than specified in the lubricant table.
1. Do not mix to use the hydraulic oil with other manufacturer's oil. If required to use another manufacturer's oil, be
sure to completely replace the full amount of oil.
2. Super EX46 HN (Change interval: 4000 hours of operation) hydraulic oil is used on new machine. When additions
or changes are required, using Super EX46 HN is recommended. In case unavoidable, Super Hydro 46 WRHO
should be used, oil change interval becomes to 2500 hours. In case Bartran HV 46 is used, oil change interval be-
comes to 1500 hours.
3. In case the hydraulic oil change interval of 400 hours is used, always use the same brand oil when add or change
the oil. If unavoidably changed to the 2500 hour change-interval oil, shorten the change interval to 2500 hours.
When changing to 1500 hour change-interval oil is used, shorten the change interval to 1500 hours
3. Never start the engine without hydraulic oil in the system.
4. Be sure to coat pins with grease before installing them.
MAINTENANCE
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