Komatsu PC290LC-11 Operation & Maintenance Manual page 443

ATTACHMENTS AND OPTIONS
ACCUMULATOR
The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an ex-
plosion, which will lead to serious injury or death. For handling, always observe the following.
• 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.
• 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.
These accumulators (6) and (7) are installed to reduce the
peak pressure in the hydraulic circuit when the breaker is being
used. Do not touch it usually.
When inspecting the accumulator, see "METHOD FOR
CHECKING AND RELEASING NITROGEN GAS CHARGE
PRESSURE IN ACCUMULATOR (FOR BREAKER) (4-61)".
1ST-LINE ATTACHMENT PROPORTIONAL SWITCH
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.
2ND-LINE ATTACHMENT PROPORTIONAL SWITCH
(if equipped)
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
k k
WARNING
k k
WARNING
6-17