Hyundai HX145LCR Manual page 169

3. BOOM PRIORITY SYSTEM
(2)
Pb1
SWING T ARM
P
(1) (3) (2) (4)
SH
A c B e1 D E PS
Pc3
d1
a
PS b d
e e2
PS
Pd2 Pc2
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.
TURNING
JOINT
Puo
DR5
Po5
C4
D4
DR3
Pc41
Pc40
Pd40
DR2
Pa21
C2
D2
Pd2
DR4
P03
C1
D1
P T TRAVEL
DR0
(1) (4) (3)
Pc1
Pa1 Pd1
BUCKET T BOOM
P
P1
Dr4
T1
(3) (1) (2) (4)
Dr3
F G H PS J
P03
h1 h2
(MCV)
g h j
f
Pa5 Pb5
Pb20 Pb21
T
P04 Pa20 Pa21
BOOM PRIORITY
EPPR VALVE
C6
D6
Pc6
OPTION C
Pd6
(DOZER)
C5
D5
Pc5
OPTION B
Pd5
ARM 1
V3
Pc3
BOOM 2
Pc2
SWING
Pc1
Pd1
TRAVEL
RIGHT
P0
PS TRAVEL
Ai STRAIGHT
Pd0 P1
P3
PG(S/Motor)
P0(MCV)
P2 P3 P4
P02(MCV)
P5
T5
T2 T3 T4
Pa4
Po5
Pb4 P Pu
(MCV) (T/Joint) (MCV)
A1 A1
A4 A3 A2
P3
P2
P1
3-8
Pi1(Pump)
Rs
Pn2
BUCKET
ARM
REGEN
ARM 2
BOOM 1
P2
Dr#, dr#
P(F/CNTL
EPPR)
P1(T/S SOL)
Pi2(Pump)
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
T1
145ZF3HC04