Komatsu ecot3 PC300LC-8 Shop Manual page 149

10 Structure, function and maintenance standard
LS bypass plug
1. Hydraulic pump
2. Main spool
3. Pressure compensation valve
4. LS shuttle valve
5. LS bypass plug
6. LS circuit
Function
q Releases the residual pressure in LS pressure
circuit (6) from orifices (a) and (b).
q Slows down the rising rate of LS pressure to
prevent a sudden change of hydraulic pres-
sure.
q Bypass flow from LS bypass plug (5) causes a
pressure loss to be generated due to the circuit
resistance between throttle (c) of main spool
(2) and LS shuttle valve (4).
q Effective LS differential pressure drops to
improve a dynamic stability of the actuator.
PC300, 350-8
SEN01994-01
23