Komatsu Galeo BR380JG-1E0 Shop Manual page 100

10 Structure, function and maintenance standard
3) Action for the direction of minimizing the pump delivery
When LS differential
q
becomes larger (for example, when the area of
opening of the control valve becomes smaller
and pump pressure (PP) rises) because of the
rightward move (it reduces discharge amount)
of servo piston (12), pump pressure (PP)
pushes spool (6) to the right.
When spool (6) moves, pump pressure (PP)
q
flows from port (C) to port (D) and from port
(K), it enters the large diameter end of the pis-
ton.
Pump pressure (PP) also enters port (J) of the
q
small diameter end of the piston, but because
of the difference in area between the large
diameter end and the small diameter end on
servo piston (12), it is pushed to the right. As
the result, the servo piston (12) moves into the
direction of reducing the swash plate angle.
As LS selector pressure (PSIG) is input to port
q
(G), setting force of spring (4) is reduced.
BR380JG-1E0
pressure (dPLS)
SEN01351-00
13