Hyundai HX130LCR Manual page 140

3. BOOM PRIORITY SYSTEM
TURNING
JOINT
(2)
Pb1
SWING P T ARM BUCKET
(1) (3) (2) (4)
SH
c B e1 D E PS
A
Pc3
d1
a d
PS b e
e2
PS
Pd2 Pc2 Pa5
Pd40 Pd41
Pb3 Pc40 Pc41 Pc42
When carrying out the combined operation of swing and boom up, the boom up operating speed is
lowered then normal operation.
To increase working efficiency, swing speed reducing system is used.
The pilot oil from pilot pump flow into P03 port in main control valve through boom priority EPPR
valve. P03 oil pressure moves swing reducing spool to lower position and oil flow rate to the swing
motor decreased.
Then, the boom up speed is increased. This is called the boom priority system.
The boom up speed can be adjusted by the cluster. Refer to page 3-20 of the operator's manual.
C6
D6
Pc6
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
T TRAVEL
P
DR0
P0
PS
Ai
(3)
(1) (4)
Pa1 Pd1 Pc1
T BOOM
P
P2
P1
Dr4
T1
(3) (1) (2) (4)
T2
Po5
Dr3
Dr5
F G H PS J
P03 Pb4
h1 h2
(MCV) (MCV)
g
h j
f
A4
Pb5
Pb20 Pb21
T
P04 Pa20 Pa21
BOOM PRIORITY
EPPR VALVE
Rs
OPTION C
(DOZER)
OPTION B
ARM 1
BOOM 2
SWING
TRAVEL
RIGHT
TRAVEL
STRAIGHT
Pd0 P2
P3 P1
PG(S/Motor)
P0(MCV)
P3 P4
P02(MCV)
P5
T5
T3 T4
Pa4
P Pu
(T/Joint) (MCV)
A1
A3 A2 A1
P(F/CNTL
P3
EPPR)
P2
P1
3-8
Pi1(Pump) Pi2(Pump)
Pn2 Pn1
B5
A5
Pb5
Pa5
BUCKET
P04
B4
Pb4
Pa4
ARM
Pc42
REGEN
Pb3
ARM 2
Pd41
Pb21
DR1
Pb20
Pa20
BOOM 1
P02
Patt
Pb1
Pa1
TRAVEL
LEFT
T1
Dr#, dr#
130ZF3HC04
B2
A2
PS
B1
A1