Komatsu Galeo PC800-8 Shop Manual page 139

10 Structure, function and maintenance standard
Move of servo piston to the minimum side
• As the EPC valve output pressure decreases,
sleeve (2) elongates spring (1) to move down-
ward.
• Port (B) of sleeve (2) and spool (3) is opened and
port (A) is closed.
• Since the port on the large diameter side is con-
nected to the output pressure of the shuttle valve
[= small diameter pressure (PH)], servo piston
(4) is moved toward the MIN side by the force dif-
ference caused by the pressure receiving area
difference.
• Move of servo piston (4) toward the minimum
side is stopped at a position where it contacts
against the MIN adjustment screw (6).
PC800, 850-8
SEN00383-03
17