Komatsu ecot3 PC300LC-8 Shop Manual page 181

10 Structure, function and maintenance standard
2. If pilot pressure is ON (low-pressure set-
ting)
q If the pilot pressure (P) is ON, the pilot pres-
sure is led to section (A) via passage (B).
q Piston (2) works on the pressure-receiving
bore portion [(d2) – (d1)] of section A.
q This pilot pressure contracts spring (3), and
piston (2) moves to the right until making con-
tact with holder (4).
q Spring (1) stretches, installed load is reduced,
and the set pressure lowers.
q Pressurized oil proportionate to the piston
stroke is drained via passage (C) and chamber
(D).
PC300, 350-8
SEN01994-01
55