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10 Structure, function and maintenance standard
Function
q
When a breaker is installed, the return oil from
the breaker does not pass through the main
valve, but returns directly to the hydraulic tank.
When other attachments (crusher, etc.) are
q
installed, the attachment and the main valve
are interconnected.
Operation
1.
When attachment other than breaker is
installed
q
Spool (1) is pressed to the left by the force of
spring (2).
q
Ports (ATT) and (V) are interconnected and
ports (ATT) and (T) are shut off. Attachment is
thus interconnected to the control valve.
PC300, 350-8
2.
When breaker is installed
q
Pilot pressure from the attachment circuit
selector solenoid valve contracts spring (2),
and spool (1) moves to the right to the stroke
end.
q
Ports (ATT) and (V) are shut off and ports
(ATT) and (T) are interconnected.
q
Pressurized oil returning from the breaker
returns directly to the hydraulic tank via port (T)
without passing through the control valve.
SEN01994-01
59
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Table of Contents
Troubleshooting
