Komatsu ecot3 PC300LC-8 Shop Manual page 174

SEN01994-01
3. When arm IN
Operation
When the arm IN is operated, pilot spool (2) is
q
pushed under the pilot pressure from the PPC
valve.
Pressurized oil in chamber (b) inside the pop-
q
pet is drained via orifice (c).
q Pressurized oil of the arm head flows to orifice
o
(a) chamber (b)
the pressurized oil in chamber (b) lowers.
q As the pressure of chamber (b) lowers under
the pressure of port (B), poppet (5) opens.
q Pressurized oil from port (B) is led to port (A)
and then flows to the control valve.
48
o o
orifice (c) drain (T), and
10 Structure, function and maintenance standard
PC300, 350-8