Komatsu ecot3 PC300LC-8 Shop Manual page 148

SEN01994-01
Introduction of LS pressure
1. Hydraulic pump
2. Main spool
3. Pressure compensation valve
4. Valve
5. Check valve
6. LS circuit
7. LS shuttle valve
Function
Introduces the upstream pressure (down-
q
stream pressure of the spool meter-in) of pres-
sure compensation valve (3) and leads to LS
shuttle valve (7) as the LS pressure.
q Connected to actuator port (B) via valve (4),
and makes LS pressure
sure.
Inlet pore (a) inside main spool (2) has a small
q
diameter concurrently serving as a throttle.
Operation
q When main spool (2) is operated, the pump
pressure enters port (c) via inlet pore (a) and is
led to the LS circuit.
q When the pump pressures rises to reach the
load pressure of port (B), check valve (5)
opens.
22
C
actuator load pres-
10 Structure, function and maintenance standard
PC300, 350-8