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3-8
RIGHT
LEFT
Pc42
Pb3
Pd41
B2
A2
Pb1
A1
B1
Pa1
T1
V3
Pd2
Pc2
D2
C2
Pc1
D1
C1
P0
DR0
Pd1
Ai
B4
B5
A5
Pa5
Pb5
Pa4
Pb4
C5
D5
D4
C4
Pc41
Pc5
Pd5
Rs
C6
Pd6
Pc6
D6
DR4
P03
Patt
P02
Pn2
Pn1
Po5
Puo
P04
DR2
Pc3
Pa21
Pb21
Pb20
Pa20
DR1
DR5
DR3
Pc40
Pd40
PS
PS
Pi1(Pump)
HYDRAULIC TANK
PILOT
PUMP
Dr#, dr#
Pi2(Pump)
A5
P4
P3
P1
A4
A3
A2
A1
(MCV)
PG(S/Motor)
P02(MCV)
P03
(MCV)
Pb4
(MCV)
Pu
(T/Joint)
P
P0(MCV)
T
(3)
(1)
(2)
(4)
(3)
(1)
P
T
P
T
(2)
(4)
a
b
d
f
h
j
c
d1
B e1 D
A
E
F
G
H
J
g
e
e2
SWING
ARM
BUCKET
BOOM
PS
PS
PS
PS
PS
h1
h2
Pd40 Pd41
Pc2
Pd2
SH
Pc3
(3)
(4)
(1)
(2)
P
T
TRAVEL
Pc1
Pd1
Pa1
Pb1
Pb5
Pa5
Pb3
Pc40
Pc41
Pc42
P04
Pa20 Pa21
Pb20 Pb21
LINE FILTER
ARM
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDER
TURNING
JOINT
TRAVEL MOTOR
SWING MOTOR
P2
BOOM PRIORITY
EPPR VALVE
Boom speed
A1
PUMP
A2
PUMP
TRAVEL
STRAIGHT
TRAVEL
TRAVEL
BOOM 1
SWING
BOOM 2
ARM 1
OPTION B
OPTION C
(DOZER)
ARM
BUCKET
ARM 2
REGEN
Pu
P1
P2
P3
Pd0
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
P03 port in main control valve through boom priority EPPR
valve. P03
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.
140L3HC04
3. BOOM PRIORITY SYSTEM
3. BOOM PRIORITY SYSTEM
Summary of Contents for HX140L
Page 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 209: ...4 5 MEMORANDUM...
Page 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Page 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...