Komatsu Utility PC12R-8 MISTRAL, Shop Manual

Page: 180 / 324

CONTROL AND REGULATION OF THE SERVO-CONTROL
POWER SUPPLY
(PC12R)
20-46
TESTING AND ADJUSTMENTS
CONTROL AND REGULATION OF THE
SERVO-CONTROL POWER SUPPLY (PC12R)
H Test conditions:
.
Engine: at working temperature.
. Hydraulic oil temperature: 45 ± 55 ëC.
Before removing the cap to measure the pressure,
release the residual pressures from the circuits
(See «ELIMINATION OF RESIDUAL PRESSURES
OF THE CIRCUIT AND THE TANK») and put the sa-
fety device engagement levers into their locked posi-
tion.
After connecting the pressure gauge, pressurise the
tank. For details see «PRESSURISATION OF THE
TANK».
1. Checking the pressure ofthe servo-controls
1 - Remove the cap (1) of pump P3 and mount a pres-
sure adapter.
2 - Connect the pressure gauge E1 (60 bar).
3 - Start the engine and bring it up to high idling with
all levers in neutral position.
4 - Check the pressure.
H Normal pressure: 29
6
3
bar (30
6
3
kg/cm
2
)
2. Regulating the servo-control valve
If the pressure value does not fall within the toleran-
ces, regulate the valve (3) as follows:
1 - Take up the flooring (2).
2 - Loosen the lock nut (4) and turn the adjusting
screw (5).
. To INCREASE pressure, rotate in a CLOCK-
WISE direction.
. To DECREASE pressure, rotate in a COUN-
TER-CLOCKWISE direction.
H Each turn of the screw (5) varies the pressure
by 56 kg/cm
2
(55 bar).
3 - Lock the nut (4).
Nut: 22 w 2.5 Nm
PC12R-8 PC15R-8
RKPA0370
1
E
1
RKPB5960
2
RKPA0390
4
RKP04910
4
5
3