![background image](http://html.mh-extra.com/html/hyundai/hx140l/hx140l_manual_2196330175.webp)
3-10
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
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
2
to
380 kgf/cm
2
for increasing the digging power.
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
2
as working condition by the MCU. It is
operated max 8 seconds.
5. MAIN RELIEF PRESSURE CHANGE SYSTEM
5. MAIN RELIEF PRESSURE CHANGE SYSTEM
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
POWER BOOST
SOLENOID VALVE
MAIN RELIEF
VALVE
Auto power boost
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
140L3HC06
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...