Komatsu F30791, Shop Manual

Page: 55 / 298

. The force of the spring is adjusted so that
P
P
± P
LS
= D P
LS
=16 bar (16 kg/cm
2
) at the point
where piston (6) is balanced.
. In other words, when the area of opening of control
valve is 1/2, the pump swash plate angle is also 1/2,
and when the area of opening of control valve is 1/4,
the pump swash plate angle is also 1/4. LS differen-
tial pressure D P
LS
is always held at 16 bar (16 kg/
cm
2
), so the pump discharge amount is in accor-
dance with the area of opening of the control valve.
. For example, after balancing at an area of opening
1/4 of the control valve, if the system is operated to
3/4 of the area of opening of the control valve, LS
differential pressure D P
LS
will drop momentarily.
As a result, the LS valve is actuated and the pump
discharge amount is increased, but when the pump
swash plate angle rises to 3/4 the LS differential
pressure D P
LS
rises to 16 bar (16 kg /cm
2
), so it
is balanced in this position.
10-37
PC20R-8 PC27R-8