Komatsu ecot3 PC300LC-8 Shop Manual page 182

SEN01994-01
Variable pressure compensation valve
(Installed to the service valve)
A. Pump discharge pressure (P) (From service
valve spool)
B. Cylinder port
C. Load pressure of other work equipment
1. Valve
2. Spring
3. Sleeve
4. Poppet
5. Spring
6. Screw
7. Locknut
8. Cap
56
10 Structure, function and maintenance standard
Function
q Regulates flow distribution to the service valve
when the service valve (attachment) and the
work equipment valve (boom raising, etc.) are
operated together. (Equivalent surface area
ratio variable)
q Pressurized oil from the service valve spool is
applied to the left side of valve (1) and is led to
chamber (g) via orifice (a).
q LS pressure is led to chamber (e) via orifice
(d).
Pressurized oil of cylinder port is led to cham-
q
ber (h) via passage (c) and orifice (f).
q The force of spring (2) acts on valve (1), and
the force of spring (5) acts on poppet (4).
q The force of spring (5) can be adjusted with
screw (6).
PC300, 350-8