Komatsu PC490-11, Installation And Instruction Manual

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ACCUMULATOR
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WARNING
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an ex-
plosion, which will lead to serious injury or death or damage. For handling, always observe the follow-
ing.
• The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic
equipment, do not stand in the direction that the oil spurts out when performing the operation. In
addition, loosen the bolts slowly when performing the work.
• Do not disassemble it.
• Do not bring open flame close to it or do not dispose of it in fire.
• Do not perform drilling, welding or flame-cutting.
• Do not hit or roll it, or subject it to any impact.
• When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.
NOTICE
To the machine equipped with a breaker you need to install an accumulator whose model number
matches to that of the breaker manufacturer to the breaker piping . If breaker operation is performed
without having an accumulator installed, the service life of the machine will be reduced. Contact your
Komatsu distributor for further information regarding the breaker.
This accumulator is installed to reduce the peak pressure in the
hydraulic circuit when the breaker is used. Do not touch it usu-
ally.
When inspecting the accumulator, see “METHOD FOR
CHECKING AND RELEASING NITROGEN GAS CHARGE
PRESSURE IN ACCUMULATOR (FOR BREAKER) (4-63)”.
1ST-LINE ATTACHMENT PROPORTIONAL SWITCH
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WARNING
When operating attachment using rolling switch, lock the pedal with the lock pin to avoid accidental op-
eration.
The 1st-line attachment proportional switch operates the 1st attachment circuit (e.g. crusher).
The 1st-line attachment proportional switch is a roller propor-
tional control switch. Rolling the switch up produces movement
of the attachment, rolling down produces opposite movement.
Slight movement of the roller will give slight movement of the
attachment; full movement of the roller will give faster move-
ment of the attachment.
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
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