Hyundai HX145LCR Manual page 171

5. MAIN RELIEF PRESSURE CHANGE SYSTEM
(2)
Pb1
SWING ARM BUCKET
P T
(1) (3) (2) (4)
SH
c B e1 D E PS
A
Pc3
d1
a d
PS b e
e2
PS
Pd2 Pc2
Pd40 Pd41
Pb3 Pc40 Pc41 Pc42
When the power boost switch on the left control lever is pushed ON, the power boost solenoid valve
is actuated, the discharged oil from the pilot pump flows into Pu port of the main relief valve of main
control valve; then the setting pressure of the main relief valve is raised from 350 kgf/cm
380 kgf/cm (5400 psi) for increasing the digging power.
2
And even when pressed continuously, it is canceled after 8 seconds.
When the auto power boost function is selected to enable on the cluster, the pressure of the main
relief pressure is automatically increased to 380 kgf/cm
It is operated max 8 seconds.
C6
D6
Pc6
TURNING
JOINT
Pd6
Puo
C5
D5
Pc5
Pd5
DR5
Po5
C4
D4
DR3
Pc41
Pc40
Pd40
V3
Pc3
DR2
Pa21
C2
D2
Pc2
Pd2
DR4
P03
C1
D1
Pc1
Pd1
P T TRAVEL
DR0
P0
PS
(1) (4) (3)
Pa1 Pd1 Pc1
BOOM
P T
P1 P1
Dr4 Dr4
T1 T1
(3) (1) (2) (4)
Dr3 Dr3
F G H PS J
P03 P03
h1 h2
(MCV) (MCV)
g
h j
f
Pa5 Pb5
Pb20 Pb21
T T
P04 Pa20 Pa21
BOOM PRIORITY
EPPR VALVE
OPTION C
(DOZER)
OPTION B
ARM 1
BOOM 2
SWING
TRAVEL
RIGHT
TRAVEL
Ai STRAIGHT
Pd0
P3 P1
PG(S/Motor) PG(S/Motor)
P0(MCV) P0(MCV)
P2 P2 P3 P3 P4 P4
P02(MCV) P02(MCV)
P5 P5
T5 T5
T2 T2 T3 T3 T4 T4
Pa4 Pa4
Po5 Po5
Pb4 Pb4 P P Pu Pu
(MCV) (MCV) (T/Joint) (T/Joint) (MCV) (MCV)
A1 A1
A4 A4 A3 A3 A2 A2 A1 A1
P3 P3
P2 P2
P1 P1
POWER BOOST
SOLENOID VALVE
(5400 psi) as working condition by the MCU.
2
3-10
Pi1(Pump) Pi2(Pump)
Rs
Pn2
BUCKET
ARM
REGEN
ARM 2
BOOM 1
P2
Dr#, dr#
P(F/CNTL P(F/CNTL
EPPR) EPPR)
P1(T/S SOL) P1(T/S SOL)
Pn1
B5
A5
Pb5
Pa5
P04
B4
Pb4
Pa4
Pc42
Pb3
Pd41
B2
A2
Pb21
DR1
Pb20
Pa20
P02
PS
Patt
B1
A1
Pb1
Pa1
TRAVEL
LEFT
MAIN RELIEF
VALVE
T1
145ZF3HC06
(4980 psi) to
2