Komatsu F30791, Shop Manual

Page: 162 / 298

REGULATION OF THE PC VALVE (PC20R-8)
20-46
TESTING AND ADJUSTMENTS REGULATION OF THE PC VALVE (PC20R-8)
H If the engine speed decreases when an increase in
pressure or delivery is requested, or when the speed
of the working equipment is low, even though the en-
gine speed, the delivery pressure and the LS differen-
tial pressure are all normal, the PC valve (1) should be
regulated as follows:
1 - Loosen the check-nut (2).
2 - Turn the adjustment screw (3).
. If the working equipment speed is low, turn the
screw (3) in a CLOCKWISE direction to INCREASE
the torque absorption of the pump.
.
If the engine rpm suffer an abnormal drop, turn
the screw (3) in a COUNTER-CLOCKWISE direc-
tion to DECREASE the torque absorption.
H Turn the adjusting screw (3) within an adjustment
range of 90ë either to the right or to the left.
3 - After adjustment, tighten the check-nut (2).
PC20R-8 PC27R-8
RKPA2350
1
2
RKP04960
90
°
90
°
3
2