PDF DOWNLOAD Linkbelt Sumitomo 380X4-MH A3 Assembly Diagrams SERVICE MANUAL

380X4-MH A3 Assembly Diagrams

SERVICE MANUAL

Feb. 2017

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

Contents Travel Circuit ........................................................................................................................................................................... 2 Travel Low-speed Circuit ........................................................................................................................................................ 2 Travel High-speed Circuit ........................................................................................................................................................ 4 Straight Travel Circuit (with HBCV) .............................................................................................................................. 6 Swing Circuit ........................................................................................................................................................................... 8

J Explanation of Hydraulic Circuit and Operations (standard model)

.............................................................................................................................. 8 Swing Speed Limit Control Circuit ............................................................................................................................ 10 Swing Relief Cut Control Circuit Swing Brake Circuit ............................................................................................................................................................... 12 ............................................................................................................................ 14 Free Swing Circuit (when starting) ............................................................................................................................ 16 Free Swing Circuit (when stopping) ............................................................................................................................ 18 Swing Parking Circuit (lever in neutral) ............................................................................................................................ 20 Swing Parking Circuit (brake release) ............................................................................................................................ 22 Swing Parking Circuit (machine stop) Boom Circuit .......................................................................................................................................................................... 24 Boom-up Circuit (for independent operation) (with HBCV) Boom-down Regenerative Circuit (with HBCV) Boom-down Load Holding Valve Circuit Boom-up Interference Prevention Circuit (with HBCV) Boom-up End Shock Reduction Circuit (with HBCV)

............................................................................................................................ 24 ............................................................................................................................ 26 ............................................................................................................................ 28 ............................................................................................................................ 30 ............................................................................................................................ 32

Arm Circuit ............................................................................................................................................................................. 34 Arm-in Circuit (with HBCV) .................................................................................................................................................... 34 Arm Semi-parallel 1 Circuit (with HBCV) ............................................................................................................................ 36 Arm Semi-parallel 1 Circuit (for ............................................................................................................................ 38 compound operation) (ex.: arm-out + right swing operations) (with HBCV) Arm Semi-parallel 2 Circuit (for ............................................................................................................................ 40 independent operation) (with HBCV) Arm Semi-parallel 2 Circuit (for ............................................................................................................................ 42 compound operation) (ex.: arm-out + boom-up operations) (with HBCV) Arm-out Regenerative Circuit (with ............................................................................................................................ 44 HBCV) Arm-in Interference Prevention Circuit ............................................................................................................................ 46 (with HBCV) Arm-in Shock Reduction Circuit (with ............................................................................................................................ 48 HBCV) Arm-out End Shock Reduction Circuit ............................................................................................................................ 50 (with HBCV) Negative Control Circuit ....................................................................................................................................................... 52 Negative Control Circuit ........................................................................................................................................................ 52 Other Circuits ........................................................................................................................................................................ 54

Cushion Circuit (ex.: when stopping arm- ............................................................................................................................ 56 out operation) Heat Circuit (lever in neutral) ................................................................................................................................................ 58 Auto Pressure Boost Circuit (arm in) (with ............................................................................................................................ 60 HBCV) Elevator Cab Up/Down Circuit .............................................................................................................................................. 62 LM Circuit .............................................................................................................................................................................. 64

model)

(standard

Operations

and

Circuit

Hydraulic

of

Explanation

1

2

Travel Circuit Travel Low-speed Circuit

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2 CCW par2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1 DOWN par1

P

P

MA

MB

ps1

T3

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

VB

P3 ps2

2.55MPa at 30L/min

11

12

CENTER CUT pcc

pga1

35.8-37.8MPa at 50L/min

VA

VA

REG

VB

REG

35.8-37.8MPa at 50L/min

pga2

pdp A5

TRAVEL(L)

39.2MPa at 20L/min 39.2MPa at 20L/min

B5

TRAVEL(R)

ARM(2)

ARM(1) pb5 OUT

OUT pb9

pa5 IN

IN pa9

BACKWARD

BACKWARD

par ARM REGENERATIVE D

MB

MA

D

ARM 2 SUB CONTROL

13

pap pgb

pc3 ARM 1 SUB CONTROL

13

10

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

BOOM(2)

B8

T

BOOM(1)

pb4 DOWN

DOWN pb8

P

UP pa8

pa4 UP

1

9

39.2MPa at 20L/min 39.2MPa at 20L/min

B3 A3 SWING

5

B7

2

4

6

3

A7

BUCKET

pb3 LEFT

CLOSE pb7

pa3 RIGHT

OPEN pa7

B2 A2

B6

39.2MPa at 20L/min 39.2MPa at 20L/min

OPTION pb2 GRAPPLE OPEN

BACKWARD

pa2 GRAPPLE CLOSE

FORWARD

A6 pb6

pa6

P4

B1 A1 BACKWARD

DR3p

pb1 FORWARD

TRAVEL STRAIGHT

pst

pa1

15 MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

14

P1

P2

PH

6 6 P1

16

C2

SWING BRAKE

C3

2-STAGE RELIEF

D1

4

5

CENTER CUT

A1

C12

C1

8 3 1

17 P0 1932BC5D

7

A2

A3

3 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

7

Oil cooler

13

Swash plate

2

Control valve

8

Main computer

14

Left travel spool

3

5-stack solenoid valve

9

Travel motor

15

Right travel spool

4

Lever lock solenoid valve

10

Travel remote control valve

16

Travel high-speed select switch

5

Console lever lock switch

11

Forward left

17

Travel high-speed solenoid valve

6

Check valve

12

Forward right

The machine travels at high speed when the angle of the travel motor (9) swash plate (13) is small.

The machine travels at low speed when the angle of the travel motor (9) swash plate (13) is large.

As an example, this section explains the case in which the forward travel operation is carried out.

When the travel remote control valve (10) is operated to the forward side, the pilot pressure oil is fed to Port pa1 of the control valve (2) and switches the left travel spool (14) to the forward side.

At the same time, the pressure oil is also fed to Port pa6 of the control valve (2) and switches the right travel spool (15) to the forward side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and the discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2).

Switching the left travel spool (14) and right travel spool (15) lets each discharge oil flow to the travel motor (9) and causes forward travel.

When the travel high-speed select switch (16) is set to low-speed travel, the travel high-speed solenoid valve (17) is turned OFF and the pilot pressure oil from Port P of the travel motor (9) returns to the hydraulic tank through Port C1 of the 5-stack solenoid valve (3).

As a result, the angle of the travel motor (9) swash plate (13) becomes larger and the machine travels at low speed.

Even if the travel high-speed select switch (16) is set to high-speed travel, when the key switch is turned OFF and then ON again, the swash plate (13) angle becomes larger and the low-speed travel is resumed.

The return oil from the travel motor (9) returns to the hydraulic tank through the left and right travel spools.

4

Travel High-speed Circuit

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2 CCW par2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1 DOWN par1

P

MB

P

MA

T3

ps1

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

VB

P3 ps2

2.55MPa at 30L/min

11

12

CENTER CUT pcc

pga1

35.8-37.8MPa at 50L/min

VA

VA

REG

VB

REG

35.8-37.8MPa at 50L/min

pga2

pdp A5

TRAVEL(L)

TRAVEL(R)

BACKWARD

BACKWARD

39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(1)

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE

D

MB

MA

D

ARM 2 SUB CONTROL

13

pap pgb

pc3 ARM 1 SUB CONTROL

13

10

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

BOOM(2)

B8

T

BOOM(1)

pb4 DOWN

DOWN pb8

pa4 UP

P

UP pa8

1

9

39.2MPa at 20L/min 39.2MPa at 20L/min

B3 A3 SWING

5

B7

2

4

6

3

A7

BUCKET

pb3 LEFT

CLOSE pb7

pa3 RIGHT

OPEN pa7

B2 A2

B6

39.2MPa at 20L/min 39.2MPa at 20L/min

OPTION pb2 GRAPPLE OPEN

BACKWARD

pa2 GRAPPLE CLOSE

FORWARD

A6 pb6

pa6

P4

B1 A1 BACKWARD

DR3p

pb1 FORWARD

TRAVEL STRAIGHT

pst

pa1

15 MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

14

P1

P2

PH

6 P1

16

C2

SWING BRAKE

C3

2-STAGE RELIEF

6 D1

4

5 7

CENTER CUT

C12

A1

C1

19 8 3 1

17 P0 53662675

A2

A3

5 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

7

Oil cooler

13

Swash plate

2

Control valve

8

Main computer

14

Left travel spool

3

5-stack solenoid valve

9

Travel motor

15

Right travel spool

4

Lever lock solenoid valve

10

Travel remote control valve

16

Travel high-speed select switch

5

Console lever lock switch

11

Forward left

17

Travel high-speed solenoid valve

6

Check valve

12

Forward right

The machine travels at high speed when the angle of the travel motor (9) swash plate (13) is small.

The machine travels at low speed when the angle of the travel motor (9) swash plate (13) is large.

As an example, this section explains the case in which the forward travel operation is carried out.

When the travel remote control valve (10) is operated to the forward side, the pilot pressure oil is fed to Port pa1 of the control valve (2) and switches the left travel spool (14) to the forward side.

At the same time, the pressure oil is also fed to Port pa6 of the control valve (2) and switches the right travel spool (15) to the forward side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and the discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2).

Switching the left travel spool (14) and right travel spool (15) lets each discharge oil flow to the travel motor (9) and causes forward travel.

When the travel high-speed select switch (16) is set to high-speed travel, the travel high-speed solenoid valve (17) is turned ON and the pilot pressure oil from Port C1 of the 5-stack solenoid valve (3) flows into Port P of the travel motor (9).

As a result, the angle of the travel motor (9) swash plate (13) becomes smaller and the machine travels at high speed.

Even if the travel high-speed select switch (16) is set to high-speed travel, when the key switch is turned OFF and then ON again, the swash plate (13) angle becomes larger and the low-speed travel is resumed.

The return oil from the travel motor (9) returns to the hydraulic tank through the left and right travel spools.

6

Straight Travel Circuit (with HBCV)

Tr1

P

MB

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

P

MA

2ND OPTION CW pbr2 CCW par2

REG

VA VB

VA

35.8-37.8MPa at 50L/min

VB

REG

35.8-37.8MPa at 50L/min

26 BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1 DOWN par1

T3

ps1

T4

DR2h

T1

T2

DR1h 2.55MPa at 30L/min

pga2

D

MB

MA

13

D

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

G1

(G3)

C 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

9

B A

B A

pdp

13

A5

(G3)

G1 C

ARM(2)

ARM(1) pb5 OUT

OUT pb9

pa5 IN

IN pa9

PL PL

par ARM REGENERATIVE

I

K

Q

A

E

C

M

G

PN

DR

O ARM 2 SUB CONTROL

T

20

pc3 ARM 1 SUB CONTROL

pgb

A8 B8

39.2MPa at 20L/min 27.4MPa at 280L/min

pb4 DOWN

DOWN pb8

pa4 UP

R J

L

RIGHT

PB

LEFT

D

B

IN

PD

PF

OUT

UP

F

H

PH

N

PP

P

UP 39.2MPa at 20L/min 39.2MPa at 20L/min

B3 A3

DOWN

SWING

CLOSE

A7

pa3 RIGHT

OPEN pa7

B2 A2

B6

39.2MPa at 20L/min 39.2MPa at 20L/min

OPTION

23

pb2 GRAPPLE OPEN

12

BACKWARD

P1

FORWARD

pa6

TRAVEL(L)

TRAVEL(R)

B1

BACKWARD

BACKWARD

A1 BACKWARD

15 TRAVEL STRAIGHT

FORWARD

pst

pa1

P3

T

ARM A2

P1

EV

C

BUCKET CLOSE-CONT

D

ARM 2 SUB-CONT

E

ARM REGENE

F

BOOM REGENE

ARM 1 SUB-CONT

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

T

A1

B

A

22

14 BOOM

21

DR3p

pb1

10 P2

A6 pb6

pa2 GRAPPLE CLOSE P4

27

19

CLOSE pb7

18 11

pa8 B7

BUCKET

pb3 LEFT

OPEN

DR

pap

P1

P2

PH

A3

A1

P 5

1

2

4

6

T1

3

6 P1 P

D1

5

4

C2 SWING BRAKE T

7

24

C3

2-STAGE RELIEF

CENTER CUT

A1

C12

BOOM 2

4

3

GRAPPLE DOWN

CLOSE 1

OPEN 3

C1

16 8

25 F4AA6DA9

1 17 P0

A2

A3

6

7 Pressure line (P1 side)

Pilot pressure line

Pressure line (P2 side)

Pilot tank line

Tank line

Electric line

1

Hydraulic pump

10

Travel remote control valve

19

Boom [1] spool

2

Control valve

11

Forward left

20

Boom [2] spool

3

5-stack solenoid valve

12

Forward right

21

Straight travel spool control

4

Lever lock solenoid valve

13

Swash plate

22

Straight travel spool

5

Console lever lock switch

14

Left travel spool

23

Check valve with travel merge orifice

6

Check valve

15

Right travel spool

24

Remote control valve (boom, bucket)

7

Oil cooler

16

Travel high-speed select switch

25

Boom up

8

Main computer

17

Travel high-speed solenoid valve

26

Boom cylinder

9

Travel motor

18

Cushion valve

27

3-stack pressure reducing valve

As an example, this section explains the case in which forward travel and boom-up operation are carried out simultaneously.

When the travel remote control valve (10) is operated to the forward side, the pilot pressure oil is fed to Port pa1 of the control valve (2) and switches the left travel spool (14) to the forward side.

In the same way, the oil is also fed to Port Pa6 of the control valve (2) and switches the right travel spool (15) to the forward side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and the discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2).

Switching the left travel spool (14) and right travel spool (15) lets each discharge oil flow to the travel motor (9) and causes forward travel.

If a boom-up operation is carried out during travel, the pilot pressure oil is fed to Port pa8 and Port pa4 of the control valve (2) via the cushion valve (18) and switches the boom [1] spool (19) and boom [2] spool (20) to the up side.

When a compound operation (it is a boom-up operation and forward travel operation this time) is detected by the sensors, the main computer (8) turns ON the straight travel spool control (21) and the pilot pressure oil is fed to Port pst of the control valve (2) and switches the straight travel spool (22).

The amount of switching of the straight travel spool (22) varies with the upper pilot pressure. (The pilot pressure is low for slight upper operation. As a result, the amount of switching of the straight travel spool (22) is reduced and the travel speed is stabilized.)

Switching the straight travel spool (22) allows the pressure oil from Port P1 of the control valve (2) to drive the left and right travel motors (9) and the pressure oil from Port P2 of the control valve (2) to drive the boom.

Because the left and right motors are driven by 1 pump, the left and right motors have the same pressure and straight travel is possible.

Furthermore, the excess oil from P2 of the control valve (2) is fed to the travel side via the check valve with travel merge orifice (23) to minimize the drop in speed.

The same operations are carried out when travel and an upper actuator other than for the boom are operated simultaneously.

8

Swing Circuit Swing Speed Limit Control Circuit

Tr1

LEFT

A

RIGHT

MU

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2

9

B

CCW par2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

ELEVATOR UP pbr1

2

GB

29.4MPa at 350L/min

GA

DOWN par1

T3

ps1

T4

DR2h

T1 T2

DR1h

13

Dr

2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(1)

250.0cm 3/rev

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

Au

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

17

BOOM(2)

P

B8

BOOM(1)

pb4 DOWN

DOWN pb8 UP pa8

pa4 UP

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A3 LEFT

B7 A7

BUCKET

CLOSE pb7

pb3

RIGHT

6

OPEN pa7

pa3

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

6

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

7

P4

14

B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

pst

10 Q

I

K

C

A

E

G

M

PN

O

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

T

PH

P2

15

R

J RIGHT

L

PB

LEFT

IN

D

B

PD

PF

OUT

UP

F

H

PH

N

PP

P

(FRONT)

Psv1

a1

DOWN CLOSE

OPEN

A1

A2

a2

Psv2

(REAR)

8 3

11

P1

5

D1

C2 P

T

18 C3 2-STAGE RELIEF

CENTER CUT C12

ARM IN

SWING OUT

2

4

LEFT 3

C1

16

M

a5

A3 a3

Dr

2-STAGE TRAVEL

1

RIGHT

B1

1

B3 OUT

12 38C9C112

4

P0

IN

Dr3

9 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

7

Oil cooler

13

Swing motor relief valve

2

Control valve

8

Main computer

14

Swing pilot pressure sensor

3

5-stack solenoid valve

9

Swing motor

15

P1 pressure sensor

4

Lever lock solenoid valve

10

Cushion valve

16

P1 flow control proportional valve

5

Console lever lock switch

11

Remote control valve (arm, swing)

17

Swing spool

6

Check valve

12

Right swing

18

Swing brake solenoid

This control suppresses swing speed increase caused by increased pump flow. (Only in H and SP modes) When an independent swing operation is carried out, the main computer (8) receives electrical signals from the swing pilot pressure sensor (14) and P1 pressure sensor (15) and outputs an electrical signal to the P1 flow control proportional valve (16).

The discharge oil from A3 of the hydraulic pump (1) is fed to the P1 flow control proportional valve (16).

The electrical signal output from the main computer (8) to the P1 flow control proportional valve (16) reduces the discharge flow on A1 of the hydraulic pump (1).

The control is canceled when a compound operation is performed.

10

Swing Relief Cut Control Circuit

Tr1

LEFT

A

RIGHT

MU

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2

9

B

CCW par2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

ELEVATOR UP pbr1

2

GB

29.4MPa at 350L/min

GA

DOWN par1

T3

ps1

T4

DR2h

T1 T2

DR1h

13

Dr

2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(1)

250.0cm 3/rev

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

Au

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

17

BOOM(2)

P

B8

BOOM(1)

pb4 DOWN

DOWN pb8 UP pa8

pa4 UP

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A3 LEFT

B7 A7

BUCKET

CLOSE pb7

pb3

RIGHT

6

OPEN pa7

pa3

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

6

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

7

P4

14

B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

pst

10 Q

I

K

C

A

E

G

M

PN

O

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

T

PH

P2

15

R

J RIGHT

L

PB

LEFT

IN

D

B

PD

PF

OUT

UP

F

H

PH

N

PP

P

(FRONT)

Psv1

a1

DOWN CLOSE

OPEN

A1

A2

a2

Psv2

(REAR)

8 3

11

P1

5

D1

C2 P

T

18 C3 2-STAGE RELIEF

CENTER CUT C12

ARM IN

SWING OUT

2

4

LEFT 3

C1

16

M

a5

A3 a3

Dr

2-STAGE TRAVEL

1

RIGHT

B1

1

B3 OUT

12 38C9C112

4

P0

IN

Dr3

11 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

7

Oil cooler

13

Swing motor relief valve

2

Control valve

8

Main computer

14

Swing pilot pressure sensor

3

5-stack solenoid valve

9

Swing motor

15

P1 pressure sensor

4

Lever lock solenoid valve

10

Cushion valve

16

P1 flow control proportional valve

5

Console lever lock switch

11

Remote control valve (arm, swing)

17

Swing spool

6

Check valve

12

Right swing

18

Swing brake solenoid

When an independent abrupt swing operation is carried out, the starting pressure is boosted and the excess oil is ejected from the swing motor relief valve (13) to the tank line.

This control provides an energy-saving effect by controlling the pump in such a way as to minimize the excess oil.

As an example, this section explains the case in which the right swing operation is carried out.

When a right swing operation starts, the main computer (8) receives electrical signals from the swing pilot pressure sensor (14) and P1 pressure sensor (15) and outputs an electrical signal to the P1 flow control proportional valve (16).

The P1 flow control proportional valve (16) is controlled by the electrical signal output from the main computer (8) and the discharge flow on A1 of the hydraulic pump (1) is reduced.

Also, the pilot pressure is controlled by an electrical signal input from the P1 pressure sensor (15) and the discharge flow on A1 of the hydraulic pump (1) increases gradually.

The control is canceled when a compound operation is performed.

12

Swing Brake Circuit

LEFT

A

RIGHT

MU

B

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2

GB

29.4MPa at 350L/min

GA

CCW par2

19

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

13

ELEVATOR

2 Dr

UP pbr1

9

DOWN par1

T3

ps1

T4

DR2h

T1

T2

DR1h 2.55MPa at 30L/min

pga2

250.0cm3/rev

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp A5

Au

39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(1)

P

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

11

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

B8

BOOM(1)

BOOM(2)

P

pb4 DOWN

T

DOWN pb8

pa4 UP

UP pa8

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

A3 LEFT

CLOSE pb7 OPEN pa7

pa3 B2 A2

17

SWING

2

4

1

3

7

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

LEFT

OUT

6

A7

BUCKET

RIGHT

ARM

6

B7

pb3

IN

pap pgb

pc3 ARM 1 SUB CONTROL

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

pst

12 8

14

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

10

PH

P1

3 I

Q

K

A

C

E

G

M

PN

O

5

15

16 (FRONT)

T

P1

P2

1

Psv1

a1

A1

A2

a2

Psv2

(REAR)

D1

C2 R

J RIGHT

L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

H

N

PH

PP

P

DOWN CLOSE

OPEN

C3

2-STAGE RELIEF

4

CENTER CUT

18

C12

C1

M

2-STAGE TRAVEL

a5

A3 a3

Dr

B1

B3 OUT

P0 IN 54EC05D5

Dr3

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

13 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

P1 pressure sensor

2

Control valve

9

Swing motor

16

P1 flow control proportional valve

3

5-stack solenoid valve

10

Cushion valve

17

Swing spool

4

Lever lock solenoid valve

11

Remote control valve (arm, swing)

18

Swing brake solenoid

5

Console lever lock switch

12

Right swing

19

Make-up check valve

6

Check valve

13

Swing motor relief valve

7

Oil cooler

14

Swing pilot pressure sensor

As an example, this section explains the case in which the brake circuit operation is carried out after the end of a right swing operation.

When the remote control valve (11) is returned to neutral from the right swing side, the pilot pressure oil is cut off and the control valve (2) swing spool (17) returns to neutral.

The pressure oil fed from Port A3 of the control valve (2) to Port B of the swing motor (9) is cut off.

At the same time, the destination location is eliminated for the pressure oil flowing from Port A of the swing motor (9) to Port B3 of the control valve (2), so the pressure rises to the set pressure of the swing motor relief valve (13).

The pressure generated here becomes a brake force and stops the swing motor (9).

When the swing operation is stopped, since the swing motor (9) continues to rotate for a while due to inertia, the oil in the swing motor (9) falls short.

In order to make up this shortfall, pressure oil is supplied from Port T3 of the control valve (2) through Port MU of the swing motor (9) and make-up check valve (19) to prevent cavitation.

14

Free Swing Circuit (when starting)

Tr1

20

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2

21

A

LEFT

A

RIGHT

MU

CCW par2

9

B

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1

T

P

DOWN par1

GB

29.4MPa at 350L/min

GA

T3

ps1

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

13

Dr

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(2)

ARM(1)

250.0cm3/rev

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE

Au

ARM 2 SUB CONTROL

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

P

BOOM(2)

B8

BOOM(1)

pb4 DOWN

DOWN pb8 UP pa8

pa4 UP

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A3 LEFT pb3

B7

CLOSE pb7

RIGHT

OPEN pa7

pa3 B2 A2

6

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

17

6

A7

BUCKET

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

7

P4

14

B1 A1

TRAVEL(L)

pb1 BACKWARD

10 Q

I

A

K

DR3p

pa1 FORWARD

C

G

E

M

PN

TRAVEL STRAIGHT

O

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

T

pst

P2

PH

15

16

1

R

J RIGHT

8 L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

H

N

PH

PP

19

(FRONT)

Psv1

a1

P

A1

A2

a2

Psv2

(REAR)

DOWN CLOSE

OPEN

3

5

11 P1 P

D1

C2 T

18

C3

2-STAGE RELIEF

M

CENTER CUT C12

a5

A3 a3

4 Dr

ARM IN 2

B1

SWING OUT

LEFT

RIGHT

4

3

1

C1

B3 OUT

2-STAGE TRAVEL

IN

12 P0 8019AACE

Dr3

15 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

P1 pressure sensor

2

Control valve

9

Swing motor

16

P1 flow control proportional valve

3

5-stack solenoid valve

10

Cushion valve

17

Swing spool

4

Lever lock solenoid valve

11

Remote control valve (arm, swing)

18

Swing brake solenoid

5

Console lever lock switch

12

Right swing

19

Free swing switch

6

Check valve

13

Swing motor relief valve

20

Free swing solenoid valve

7

Oil cooler

14

Swing pilot pressure sensor

21

Orifice

Purpose Reduces the shock generated when a swing operation is started or stopped.

Caution When the free swing is turned ON, the acceleration performance when starting a swing operation deteriorates.

Also, the swing flow continues to increase even after the swing operation is stopped, therefore it takes longer to stop.

Operation explanation When the free swing switch (19) is turned ON, the free swing solenoid valve (20) is switched by the electrical signal output from the main computer (8), connecting Port GA and Port GB of the swing motor (9) via the orifice (21).

When the remote control valve (11) is operated to the right swing side, the pilot pressure oil is fed to Port Pa3 of the control valve (2) and switches the swing spool (17) to the right swing side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the swing spool (17) via the parallel oil path.

Switching the swing spool (17) lets the pressure oil flow into Port B of the swing motor (9) and the right swing operation is carried out.

The pressure oil branched off inside the swing motor (9) flows into Port GA of the swing motor (9) through Port GB of the swing motor (9), the free swing solenoid valve (20), and the orifice (21) to reduce the shock generated when the swing operation starts.

The return oil from Port GA of the swing motor (9) returns to the hydraulic tank through Port A of the swing motor (9) and the swing spool (17).

16

Free Swing Circuit (when stopping)

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

20

2ND OPTION CW pbr2

13 LEFT

21

A

A

RIGHT

MU

9

CCW par2

B

T

P

ELEVATOR UP pbr1 DOWN par1

GB

29.4MPa at 350L/min

GA

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2 ps1

T3

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

Dr

CENTER CUT pcc

pga1

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(2)

ARM(1) pb5 OUT

OUT pb9

pa5 IN

IN pa9

250.0cm3/rev

par ARM REGENERATIVE

Au

ARM 2 SUB CONTROL

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

P

BOOM(2)

B8

BOOM(1)

pb4 DOWN

DOWN pb8 UP pa8

pa4 UP

B3 A3 LEFT

39.2MPa at 20L/min 39.2MPa at 20L/min

B7

CLOSE pb7

pb3 RIGHT

OPEN pa7

pa3 B2 A2

6

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

17

6

A7

BUCKET

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

7

P4

14

B1 A1

TRAVEL(L)

pb1 BACKWARD

10 Q

I

A

K

DR3p

pa1 FORWARD

C

G

E

M

PN

TRAVEL STRAIGHT

O

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

PH

P1

T

pst

P2

1

15

16 R

J RIGHT

8 L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

H

N

PH

PP

19

(FRONT)

Psv1

a1

P

A1

A2

a2

Psv2

(REAR)

DOWN CLOSE

OPEN

3

5

11 P1 P

D1

C2 T

18

C3

2-STAGE RELIEF

M

CENTER CUT C12

a5

A3 a3

4 Dr

ARM IN 2

B1

SWING OUT

LEFT

RIGHT

4

3

1

C1

B3 OUT

2-STAGE TRAVEL

IN

12 P0 5778D685

Dr3

17 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

P1 pressure sensor

2

Control valve

9

Swing motor

16

P1 flow control proportional valve

3

5-stack solenoid valve

10

Cushion valve

17

Swing spool

4

Lever lock solenoid valve

11

Remote control valve (arm, swing)

18

Swing brake solenoid

5

Console lever lock switch

12

Right swing

19

Free swing switch

6

Check valve

13

Swing motor relief valve

20

Free swing solenoid valve

7

Oil cooler

14

Swing pilot pressure sensor

21

Orifice

Purpose Reduces the shock generated when a swing operation is started or stopped.

Caution When the free swing is turned ON, the acceleration performance when starting a swing operation deteriorates.

Also, the swing flow continues to increase even after the swing operation is stopped, therefore it takes longer to stop.

Operation explanation When the free swing switch (19) is turned ON, the free swing solenoid valve (20) is switched by the electrical signal output from the main computer (8), connecting Port GA and Port GB of the swing motor (9) via the orifice (21).

When the remote control valve (11) is returned to neutral from the right swing side, the pilot pressure oil is cut off and the control valve (2) swing spool (17) returns to neutral.

The pressure oil fed from Port A3 of the control valve (2) to Port B of the swing motor (9) is cut off.

At the same time, the destination location is eliminated for the pressure oil flowing from Port A of the swing motor (9) to Port B3 of the control valve (2), so the pressure rises to the set pressure of the swing motor relief valve (13) in the swing motor (9).

The pressure oil that reached the set pressure opens the swing motor relief valve (13) and flows into Port B of the swing motor (9).

Also, the pressure oil flows into Port GB through Port GA of the swing motor (9), the orifice (21), and the free swing solenoid valve (20) to reduce the shock generated when the swing operation is stopped.

When the swing operation is stopped, since the swing motor (9) continues to rotate for a while due to inertia, the oil in the swing motor (9) falls short.

In order to make up this shortfall, the pressure oil is supplied from Port T3 of the control valve (2) to Port MU of the swing motor (9) to prevent cavitation.

18

Swing Parking Circuit (lever in neutral)

LEFT

A

9

RIGHT

MU

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

B

2ND OPTION CW pbr2 CCW par2

GB

29.4MPa at 350L/min

GA

11

ELEVATOR UP pbr1 DOWN par1

13

Dr

P

19

T

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2 ps1

T3

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

250.0cm3/rev

pdp A5

ARM

ARM(1)

SWING

IN

OUT 2

LEFT

4

RIGHT

P

1

3

39.2MPa at 20L/min 39.2MPa at 20L/min

B5

Au

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

12

B8

BOOM(1)

BOOM(2) pb4 DOWN

DOWN pb8

pa4 UP

14

UP pa8

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

Q

RIGHT

OPEN pa7

pa3 B2 A2

K

A7 CLOSE pb7

pb3

10 I

B7

BUCKET

A3 LEFT

A

C

G

E

M

PN

O

TRAVEL(R)

OPTION

17

T

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

R

J RIGHT

L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

PH

H

N

PP

TRAVEL STRAIGHT

P

DOWN CLOSE

OPEN

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

3 P1

D1

5

16

6

PH

P1

P2

6 1

15 (FRONT)

Psv1

a1

A1

A2

a2

Psv2

(REAR)

C2

8 18

C3

2-STAGE RELIEF

CENTER CUT C12

20 C1

2-STAGE TRAVEL

4

M

a5

A3 a3

Dr

P0

B1

B3 OUT

IN 2BA86E16

pst

Dr3

7

19 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

P1 pressure sensor

2

Control valve

9

Swing motor

16

P1 flow control proportional valve

3

5-stack solenoid valve

10

Cushion valve

17

Swing spool

4

Lever lock solenoid valve

11

Remote control valve (arm, swing)

18

Swing brake solenoid

5

Console lever lock switch

12

Right swing

19

Make-up check valve

6

Check valve

13

Swing motor relief valve

20

Key switch

7

Oil cooler

14

Swing pilot pressure sensor

When the key switch (20) is turned ON, the swing brake solenoid (18) is switched by the electrical signal from the main computer (8).

The pressure oil from Port P of the swing motor (9) returns to the hydraulic tank through Port C2 of the 5-stack solenoid valve (3) and the swing brake solenoid (18) to hold the swing parking brake.

20

Swing Parking Circuit (brake release)

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2 CCW par2

LEFT

A

RIGHT

MU

9

B

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1 DOWN par1

GB

29.4MPa at 350L/min

GA

T3

ps1

T4

DR2h

T1

T2

DR1h 2.55MPa at 30L/min

pga2

13

Dr

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(2)

ARM(1)

250.0cm3/rev

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

Au

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

P

B8

BOOM(1)

BOOM(2) pb4 DOWN

DOWN pb8 UP pa8

pa4 UP

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

B7

CLOSE pb7

pb3

RIGHT

OPEN pa7

pa3 B2 A2

6

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

17

6

A7

BUCKET

A3 LEFT

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

7

P4

14

B1 A1

TRAVEL(L)

pb1 BACKWARD

10 Q

I

A

K

DR3p

pa1 FORWARD

C

G

E

M

PN

TRAVEL STRAIGHT

O

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

PH

P1

T

pst

P2

R

RIGHT

L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

H

N

PH

PP

P

DOWN

(FRONT)

CLOSE

1

15

16 J

Psv1

a1

A1

A2

a2

Psv2

(REAR)

OPEN

3 P1

11

5

D1

C2 P

8

T

18

C3

2-STAGE RELIEF

CENTER CUT C12

ARM IN 2

C1

SWING OUT

LEFT

RIGHT

4

3

1

M

a5

A3 a3

Dr

2-STAGE TRAVEL

B1

B3 OUT

12 63AFB779

4

P0

IN

Dr3

21 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

7

Oil cooler

13

Swing motor relief valve

2

Control valve

8

Main computer

14

Swing pilot pressure sensor

3

5-stack solenoid valve

9

Swing motor

15

P1 pressure sensor

4

Lever lock solenoid valve

10

Cushion valve

16

P1 flow control proportional valve

5

Console lever lock switch

11

Remote control valve (arm, swing)

17

Swing spool

6

Check valve

12

Right swing

18

Swing brake solenoid

As an example, this section explains the case in which the right swing operation is carried out.

When the swing lever is in neutral after the engine is started, the swing brake solenoid (18) comes ON and the pressure oil to Port P of the swing motor (9) is cut off. The swing parking brake is being applied.

When the remote control valve (11) is operated to the right swing side, the pilot pressure oil is fed to Port pa3 of the control valve (2) via the cushion valve (10) and switches the swing spool (17) to the right swing side.

At the same time, the main computer (8) detects the electrical signal from the swing pilot pressure sensor (14) and judges that a swing operation is being performed. The electrical signal output from the main computer (8) goes OFF to switch the swing brake solenoid (18).

The pilot pressure oil is fed to Port P of the swing motor (9) via Port C2 of the 5-stack solenoid valve (3) to release the swing parking brake.

The discharge oil from A1 of the hydraulic pump (1) flows into Port B of the swing motor (9) through Port P1 of the control valve (2), the parallel oil path, and the swing spool (17), and the right swing operation is carried out.

The pressure oil that passed through the swing motor (9) returns to the hydraulic tank through Port A and swing spool (17).

When this is followed by an attachment operation, the pilot pressure is detected by respective pressure sensors and the swing parking brake continues to be released.

After the swing operation ends, if about 5 sec. pass with no upper operation, the electrical signal output from the main computer (8) to the swing brake solenoid (18) turns ON and the swing parking brake is applied again.

When an upper operation is carried out after the swing operation, the swing parking brake is applied again about 1 sec. after the end of the upper operation. When an independent upper operation is carried out, the swing parking brake is released.

Also, the swing parking brake is applied again about 1 sec. after the end of the upper operation.

KEY SWITCH OFF ON ON

Swing pilot pressure sensor OFF OFF Higher than specified pressure

ON

OFF

ON

Higher than specified pressure

Attachment pilot pressure sensors OFF OFF

Swing brake solenoid valve OFF ON

Swing motor mechanical brake ON ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF

Higher than specified pressure Higher than specified pressure

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

22

Swing Parking Circuit (machine stop)

LEFT

A

9

RIGHT

MU

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

B

2ND OPTION CW pbr2 CCW par2

GB

29.4MPa at 350L/min

GA

11

ELEVATOR UP pbr1 DOWN par1

13

Dr

P

19

T

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2 ps1

T3

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

250.0cm3/rev

pdp A5

ARM

ARM(1)

SWING

IN

OUT 2

LEFT

4

RIGHT

P

1

3

39.2MPa at 20L/min 39.2MPa at 20L/min

B5

Au

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

pap pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

12

B8

BOOM(1)

BOOM(2) pb4 DOWN

DOWN pb8

pa4 UP

14

UP pa8

B3

39.2MPa at 20L/min 39.2MPa at 20L/min

Q

RIGHT

OPEN pa7

pa3 B2 A2

K

A7 CLOSE pb7

pb3

10 I

B7

BUCKET

A3 LEFT

A

C

G

E

M

PN

O

TRAVEL(R)

OPTION

17

T

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

R

J RIGHT

L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

PH

H

N

PP

TRAVEL STRAIGHT

P

DOWN CLOSE

OPEN

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

3 P1

D1

5

16

6

PH

P1

P2

6 1

15 (FRONT)

Psv1

a1

A1

A2

a2

Psv2

(REAR)

C2

8 18

C3

2-STAGE RELIEF

CENTER CUT C12

20 C1

2-STAGE TRAVEL

4

M

a5

A3 a3

Dr

P0

B1

B3 OUT

IN 2BA86E16

pst

Dr3

7

23 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

P1 pressure sensor

2

Control valve

9

Swing motor

16

P1 flow control proportional valve

3

5-stack solenoid valve

10

Cushion valve

17

Swing spool

4

Lever lock solenoid valve

11

Remote control valve (arm, swing)

18

Swing brake solenoid

5

Console lever lock switch

12

Right swing

19

Make-up check valve

6

Check valve

13

Swing motor relief valve

20

Key switch

7

Oil cooler

14

Swing pilot pressure sensor

When the machine is stopped (with the key switch OFF), the pressure oil from Port P of the swing motor (9) returns to the hydraulic tank through the swing brake solenoid (18). The swing parking brake stays applied.

24

Boom Circuit Boom-up Circuit (for independent operation) (with HBCV)

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2

10

CCW par2

2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

ELEVATOR UP pbr1 DOWN par1

ps1

T3

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

9

P3 ps2

2.55MPa at 30L/min

G1

pga1

(G3)

B A

C

CENTER CUT pcc

B A

(G3)

G1 C

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

PL ARM(2)

ARM(1)

I

K

Q

A

E

C

G

M PN

O

PL

pb5 OUT

OUT pb9

pa5 IN

IN pa9

DR

DR

T par ARM REGENERATIVE ARM 2 SUB CONTROL

12

R J

RIGHT

L

PB

LEFT

IN

B

D

PF

PD

F

H

N

PH

PP

A8 B8

39.2MPa at 20L/min 27.4MPa at 280L/min

P

OUT

pb4 DOWN

CLOSE

OPEN

DOWN pb8

pa4 UP

UP

B3 A3

19

CLOSE pb7

pa3 RIGHT

OPEN pa7

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4

P1

P2

P3 B1 A1

T

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

BOOM

A1

11

A7

BUCKET

pb3 LEFT

B2 A2

20

pa8 B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

18

pap pgb

pc3 ARM 1 SUB CONTROL

ARM A2

TRAVEL STRAIGHT

pst

EV A3 MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

PH

P1

P2

13

6 P1

P

T

C2

4

D1

SWING BRAKE

5 C3

2-STAGE RELIEF

16

7

17

CENTER CUT C12

A1 BOOM

GRAPPLE CLOSE

4

2

1

OPEN C1

3

2-STAGE TRAVEL

1 14 C68D10D6

15

3

P0

A2

A3

6

25 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

Boom (down)

2

Control valve

9

Cushion valve

16

P1 pressure sensor

3

5-stack solenoid valve

10

Boom cylinder

17

P2 pressure sensor

4

Lever lock solenoid valve

11

Boom [1] spool

18

Boom-up pilot pressure sensor

5

Console lever lock switch

12

Boom [2] spool

19

Boom-down pilot pressure sensor

6

Check valve

13

Remote control valve (boom, bucket)

20

3-stack proportional valve

7

Oil cooler

14

Boom (up)

When the remote control valve (13) is operated to the boom-up side, the pilot pressure oil is fed to Port pa8 and Port pa4 of the control valve (2) via the cushion valve (9) and 3-stack proportional valve (20), and switches the boom [1] spool (11) and boom [2] spool (12) to the up side.

The pressure oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the boom [2] spool (12) via the parallel oil path. The pressure oil from A2 of the hydraulic pump (1) is fed to the boom [1] spool (11) via the parallel oil path.

The pressure oil that passed through the boom [1] spool (11) merges with the pressure oil that passed through the boom [2] spool (12) downstream of the spool and flows into the boom cylinder (10) bottom side, and the boom-up operation is carried out.

The return oil on the boom cylinder (10) rod side returns to the hydraulic tank through the boom [1] spool (11).

26

Boom-down Regenerative Circuit (with HBCV)

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

10

10

2ND OPTION CW pbr2 CCW par2

2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

ELEVATOR UP pbr1 DOWN par1

ps1

13

T3

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

G1

CENTER CUT pcc

pga1

P

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

PL PL

20

DR

par ARM REGENERATIVE ARM 2 SUB CONTROL

4

CLOSE

2

1

pgb

pc3 ARM 1 SUB CONTROL

OPEN 3

A8 B8 DOWN pb8

39.2MPa at 20L/min 27.4MPa at 280L/min

pa4 UP

14

UP pa8

15 39.2MPa at 20L/min 39.2MPa at 20L/min

B3 A3 SWING

9 12 Q

K

C

A

DR

pap

GRAPPLE DOWN

pb4 DOWN

I

C

39.2MPa at 20L/min 39.2MPa at 20L/min

ARM(1)

BOOM

G1

B A

B A

A5 B5

UP

(G3)

(G3)

C

pdp

T

OPEN pa7

11

A8

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

O

TRAVEL(R)

OPTION

T

A7 CLOSE pb7

pa3 RIGHT B2 A2

G M PN

E

B7

BUCKET

pb3 LEFT

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

B8

P4 B1 A1

DOWN

TRAVEL(L)

pb1 BACKWARD

R

pa1 FORWARD

J

RIGHT

L

PB

LEFT

IN

B

D

PD

PF

F

H

PH

N

PP

TRAVEL STRAIGHT

pst

P

OUT CLOSE

21

OPEN

PH

P2

6

19

7

5 P1 C2

SWING BRAKE

C3

2-STAGE RELIEF

D1

17

16

1 4

CENTER CUT C12

C1

2-STAGE TRAVEL

3 P0 524B3509

22

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

18

pb8

DR3p

A1

A2

A3

6

27 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

9

Cushion valve

17

P2 pressure sensor

2

Control valve

10

Boom cylinder

18

Boom-up pilot pressure sensor

3

5-stack solenoid valve

11

Boom [1] spool

19

Boom-down pilot pressure sensor

4

Lever lock solenoid valve

12

Boom [2] spool

20

Boom load holding valve check valve

5

Console lever lock switch

13

Remote control valve (boom, bucket)

21

Regeneration orifice

6

Check valve

14

Boom (up)

22

Check valve

7

Oil cooler

15

Boom (down)

8

Main computer

16

P1 pressure sensor

When the remote control valve (13) is operated to the boom-down side, the pilot pressure oil is fed to Port pb8 of the control valve (2) via the cushion valve (9) and switches the boom [1] spool (11).

The pressure oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the boom [1] spool (11) via the parallel oil path.

The pressure oil fed to the boom [1] spool (11) flows into the boom cylinder (10) rod side, and the boom-down operation is carried out.

The pressure oil on the boom cylinder (10) bottom side returns to the hydraulic tank through the boom load holding valve check valve (20) and boom [1] spool (11).

At that time, the pressure oil is metered by the boom [1] spool (11) regeneration orifice (21) and pushes open the check valve (22) and is regenerated on the boom cylinder (10) rod side.

The lower the load pressure on the boom cylinder (10) rod side, the greater the volume of regeneration.

When the load pressure on the boom cylinder (10) rod side becomes high, the check valve (22) is closed and the return oil on the boom cylinder (10) bottom side returns to the hydraulic tank through the boom [1] spool (11) without regeneration.

28

Boom-down Load Holding Valve Circuit

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

10

10

2ND OPTION CW pbr2 CCW par2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1 DOWN par1

T3

ps1

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(1)

20

ARM(2)

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

pgb

pc3 ARM 1 SUB CONTROL

9

A8 B8 DOWN pb8

39.2MPa at 20L/min 27.4MPa at 280L/min

pb4 DOWN I

K

Q

A

C

G M PN

E

pa4 UP

O

UP pa8 39.2MPa at 20L/min 39.2MPa at 20L/min

B3 A3

T

12

pap

SWING

B7

11

A7 CLOSE pb7

BUCKET

pb3 LEFT pa3 RIGHT

OPEN pa7

R J

RIGHT

L

PB

LEFT

IN

B

D

PD

PF

OUT

UP

F

H PH

N

DOWN CLOSE

B2 A2

PP P

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

OPEN

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD

18

19

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

PH

P1

pst

P2

6 13 6 P1 P

T

C2

4

D1

5

SWING BRAKE

16

17

7 1

C3

2-STAGE RELIEF

CENTER CUT C12

A1 BOOM 4

2

14 E1456DA3

GRAPPLE CLOSE

OPEN

1

3

15

C1

2-STAGE TRAVEL

3

P0

A2

A3

29 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

8

Main computer

15

Boom (down)

2

Control valve

9

Cushion valve

16

P1 pressure sensor

3

5-stack solenoid valve

10

Boom cylinder

17

P2 pressure sensor

4

Lever lock solenoid valve

11

Boom [1] spool

18

Boom-up pilot pressure sensor

5

Console lever lock switch

12

Boom [2] spool

19

Boom-down pilot pressure sensor

6

Check valve

13

Remote control valve (boom, bucket)

20

Boom load holding valve check valve

7

Oil cooler

14

Boom (up)

When the remote control valve (13) boom operation lever is in neutral, the pressure oil on the boom cylinder (10) bottom side is sealed by the boom load holding valve check valve (20), reducing internal leakage from the boom [1] spool (11) to reduce the hydraulic drift of the boom.

30

Boom-up Interference Prevention Circuit (with HBCV)

13 P

Tr1

T

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2 CCW par2

BOOM 2

4

UP pbr1

3

1

DOWN par1

ps1

14

15

K

T4

DR2h

T1 T2

2.55MPa at 30L/min

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

E

C

A

T3

DR1h pga2

Q

10

ELEVATOR

9

I

10

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

GRAPPLE CLOSE OPEN

G

M PN

pdp

O

A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

T

ARM(1)

ARM(2)

G1 OUT pb9

pb5 OUT

(G3)

B A

C

IN pa9

pa5 IN

B A

(G3)

G1 C

par ARM REGENERATIVE

R J

RIGHT

L

PB

LEFT

IN

B

D

PF

PD

PL ARM 2 SUB CONTROL

F

H

PH

N

PP

P

OUT

pb4 DOWN

DOWN pb8

pa4 UP

19

UP

B3 A3

pa3 RIGHT

OPEN pa7

B2 A2

P1

P2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

P3

TRAVEL(R)

OPTION

T

11

A7 CLOSE pb7

BUCKET

pb3 LEFT

12

pa8 B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

20

DR

A8 B8

OPEN 39.2MPa at 20L/min 27.4MPa at 280L/min

18

DR

pgb

pc3 ARM 1 SUB CONTROL

CLOSE

PL

pap

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD

BOOM

ARM A2

A1

EV

DR3p

pa1 FORWARD

A3

TRAVEL STRAIGHT

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

26 22 23

P1 C2

4

D1

PH

P1

6 P2

5

SWING BRAKE

7 16

8 C3

2-STAGE RELIEF

17 1

CENTER CUT C12

24 25

C1

A1

2-STAGE TRAVEL

21 3 P0

91F73584

pst

A2

A3

6

31 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

10

Boom cylinder

19

Boom-down pilot pressure sensor

2

Control valve

11

Boom [1] spool

20

3-stack proportional valve

3

5-stack solenoid valve

12

Boom [2] spool

21

Computer C

4

Lever lock solenoid valve

13

Remote control valve (boom, bucket)

22

Angle sensor (bucket)

5

Console lever lock switch

14

Boom (up)

23

Angle sensor (arm)

6

Check valve

15

Boom (down)

24

Angle sensor (boom)

7

Oil cooler

16

P1 pressure sensor

25

Angle sensor (EV)

8

Main computer

17

P2 pressure sensor

26

Monitor display

9

Cushion valve

18

Boom-up pilot pressure sensor

Boom up When the remote control valve (13) is operated to the boom-up side, the pilot pressure oil is fed to Port pa8 and Port pa4 of the control valve (2) via the cushion valve (9) and 3-stack proportional valve (20), and switches the boom [1] spool (11) and boom [2] spool (12) to the up side.

The pressure oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the boom [2] spool (12) via the parallel oil path. The pressure oil from A2 of the hydraulic pump (1) is fed to the boom [1] spool (11) via the parallel oil path.

The pressure oil that passed through the boom [1] spool (11) merges with the pressure oil that passed through the boom [2] spool (12) downstream of the spool and flows into the boom cylinder (10) bottom side, and the boom-up operation is carried out.

The return oil on the boom cylinder (10) rod side returns to the hydraulic tank through the boom [1] spool (11).

Interference prevention Computer C (21) detects the positions of the attachment and elevator cab by electrical signals from the angle sensors (22) (23) (24) (25).

When the cab and end attachment come closer to each other during a boom-up operation, the main computer (8) stops the boom by closing the opening of the 3-stack proportional valve (20).

When a sensor abnormality or electrical circuit abnormality occurs, computer C (21) sends an electrical signal to the main computer (8) to operate the lever lock solenoid valve (4) and stop all the operations.

Also, a message is displayed on the monitor display (26) and the warning buzzer sounds at the same time.

Note that cushioning performance can be adjusted by adjusting the output current or control angle on the service support screen.

32

Boom-up End Shock Reduction Circuit (with HBCV)

13 P

Tr1

T

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2 CCW par2

BOOM 2

4

UP pbr1

3

1

DOWN par1

ps1

14

15

K

T4

DR2h

T1 T2

2.55MPa at 30L/min

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

E

C

A

T3

DR1h pga2

Q

10

ELEVATOR

9

I

10

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

GRAPPLE CLOSE OPEN

G

M PN

pdp

O

A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

T

ARM(1)

ARM(2)

G1 OUT pb9

pb5 OUT

(G3)

B A

C

IN pa9

pa5 IN

B A

(G3)

G1 C

par ARM REGENERATIVE

R J

RIGHT

L

PB

LEFT

IN

B

D

PF

PD

PL ARM 2 SUB CONTROL

F

H

PH

N

PP

P

OUT

pb4 DOWN

DOWN pb8

pa4 UP

19

UP

B3 A3

pa3 RIGHT

OPEN pa7

B2 A2

P1

P2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

P3

TRAVEL(R)

OPTION

T

11

A7 CLOSE pb7

BUCKET

pb3 LEFT

12

pa8 B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

20

DR

A8 B8

OPEN 39.2MPa at 20L/min 27.4MPa at 280L/min

18

DR

pgb

pc3 ARM 1 SUB CONTROL

CLOSE

PL

pap

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD

BOOM

ARM A2

A1

EV

DR3p

pa1 FORWARD

A3

TRAVEL STRAIGHT

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

26 22 23

P1 C2

4

D1

PH

P1

6 P2

5

SWING BRAKE

7 16

8 C3

2-STAGE RELIEF

17 1

CENTER CUT C12

24 25

C1

A1

2-STAGE TRAVEL

21 3 P0

91F73584

pst

A2

A3

6

33 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

10

Boom cylinder

19

Boom-down pilot pressure sensor

2

Control valve

11

Boom [1] spool

20

3-stack proportional valve

3

5-stack solenoid valve

12

Boom [2] spool

21

Computer C

4

Lever lock solenoid valve

13

Remote control valve (boom, bucket)

22

Angle sensor (bucket)

5

Console lever lock switch

14

Boom (up)

23

Angle sensor (arm)

6

Check valve

15

Boom (down)

24

Angle sensor (boom)

7

Oil cooler

16

P1 pressure sensor

25

Angle sensor (EV)

8

Main computer

17

P2 pressure sensor

26

Monitor display

9

Cushion valve

18

Boom-up pilot pressure sensor

Boom up When the remote control valve (13) is operated to the boom-up side, the pilot pressure oil is fed to Port pa8 and Port pa4 of the control valve (2) via the cushion valve (9) and 3-stack proportional valve (20), and switches the boom [1] spool (11) and boom [2] spool (12) to the up side.

The pressure oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the boom [2] spool (12) via the parallel oil path. The pressure oil from A2 of the hydraulic pump (1) is fed to the boom [1] spool (11) via the parallel oil path.

The pressure oil that passed through the boom [1] spool (11) merges with the pressure oil that passed through the boom [2] spool (12) downstream of the spool and flows into the boom cylinder (10) bottom side, and the boom-up operation is carried out.

The return oil on the boom cylinder (10) rod side returns to the hydraulic tank through the boom [1] spool (11).

End shock reduction Computer C (21) detects the boom angle by electrical signals from the angle sensor (24).

When the boom is raised close to the boom-up end, the main computer (8) gradually closes the opening of the 3-stack proportional valve (20).

This decreases the boom-up speed and reduces the shock on the boom-up stroke end.

34

Arm Circuit Arm-in Circuit (with HBCV)

19

19

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION CW pbr2 CCW par2

G1

(G3)

B

(G3)

B

G1

C

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

20

2

C

ELEVATOR UP pbr1

A

A

21

PL

PL

DOWN par1

T3

ps1 DR

T4

DR2h

T1 T2

DR1h

DR

2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp

A5 B5

39.2MPa at 20L/min 39.2MPa at 20L/min

OUT pb9

pb5 OUT

pa5 IN

IN

pa9

par ARM REGENERATIVE

9

17

ARM 2 SUB CONTROL

Q

I

A

K

C

G

E

M PN

39.2MPa at 20L/min 27.4MPa at 280L/min

T

B8

BOOM(1)

pb4 DOWN

DOWN pb8

pa4 UP

UP pa8

B3 A3

R

RIGHT

PB

LEFT

B

A7

BUCKET

pb3 LEFT D

PF

PD

UP

F

H

PH

N

DOWN CLOSE

CLOSE pb7

PP P

pa3 RIGHT

OPEN pa7

OPEN B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

22

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING L

15

18

A8

O

BOOM(2)

J

pap pgb

pc3 ARM 1 SUB CONTROL

16

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4

P2

P1

B1 A1

P3

TRAVEL(L)

pb1 BACKWARD

T

DR3p

pa1 FORWARD

BOOM

ARM

A1

TRAVEL STRAIGHT

EV

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

A3

A2

BOOST

PH

P1

pst

P2

12 4 P1 P

T

C2

SWING BRAKE

C3

2-STAGE RELIEF

5

D1

6

11

10

7 CENTER CUT

1

C12

ARM

2

LEFT

RIGHT

3

1

A1 C1

2-STAGE TRAVEL

3

13 F7FD1461

SWING 4

14

P0

A2

A3

6

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

35 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

9

Cushion valve

17

Arm [1] spool

2

Control valve

10

P1 pressure sensor

18

Arm [2] spool

3

5-stack solenoid valve

11

P2 pressure sensor

19

Arm cylinder

4

Lever lock solenoid valve

12

Remote control valve (arm, swing)

20

Arm load holding valve check valve

5

Console lever lock switch

13

Arm (in)

21

Arm-in pressure sensor

6

Check valve

14

Arm (out)

22

3-stack proportional valve

7

Oil cooler

15

Arm-in pilot pressure sensor

8

Main computer

16

Arm-out pilot pressure sensor

When the remote control valve (12) is operated to the arm-in side, the pilot pressure oil is fed to Port pa5 and Port pa9 of the control valve (2) via the cushion valve (9) and 3-stack proportional valve (22) and switches the arm [1] spool (17) and arm [2] spool (18) to the in side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the arm [1] spool (17) via the center bypass oil path.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the arm [2] spool (18) via the center bypass oil path.

The merged pressure oil merges downstream of the spool and then flows into the arm cylinder (19) rod side through the arm load holding valve check valve (20), and the arm-in operation is carried out.

The return oil on the arm cylinder (19) bottom side returns to the hydraulic tank through the arm [1] spool (17).

36

Arm Semi-parallel 1 Circuit (with HBCV)

19

19 Tr1

12

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION G1

P

(G3)

B

(G3)

B

G1

C

T

CW pbr2 CCW par2

C

A

A

ELEVATOR

2

UP pbr1

20

DR

DR

ps1

ARM

21

SWING LEFT

RIGHT

3

1

4

2

DOWN par1

T3

T4

DR2h

T1

T2

DR1h 2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

pdp

A5 B5 pb5 OUT

14

13

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

PL

PL

39.2MPa at 20L/min 39.2MPa at 20L/min

OUT

pb9

IN pa9

pa5 IN par ARM REGENERATIVE

9 17 I

Q

C

A

K

E

G

M PN

ARM 2 SUB CONTROL

pc3 ARM 1 SUB CONTROL

O

pap

18

pgb A8 39.2MPa at 20L/min 27.4MPa at 280L/min

T

B8

BOOM(1)

BOOM(2) pb4 DOWN

DOWN pb8

24

UP pa8

pa4 UP R

B3 A3 J

RIGHT

L

PB

D

B

LEFT

PD

PF

F

H

UP

PH

N

PP

CLOSE pb7

pa3 RIGHT

OPEN

OPEN pa7

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

15

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4

8

16

A7

BUCKET

pb3 LEFT

DOWN CLOSE

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

P

B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

A

B

BUCKET CLOSE-CONT

C

TRAVEL STRAIGHT

D

ARM 2 SUB-CONT

pst

22

F

E

ARM REGENE

TRAVEL STRAIGHT

BOOM REGENE MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

PH

P1

P2

6

A1 T1

P1

23 C2

SWING BRAKE

C3

2-STAGE RELIEF

D1

11

10

5

4

7

CENTER CUT C12

A1

3 C1

2-STAGE TRAVEL

1 P0 585C2883

A2

A3

6

37 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

9

Cushion valve

17

Arm [1] spool

2

Control valve

10

P1 pressure sensor

18

Arm [2] spool

3

5-stack solenoid valve

11

P2 pressure sensor

19

Arm cylinder

4

Lever lock solenoid valve

12

Remote control valve (arm, swing)

20

Arm load holding valve check valve

5

Console lever lock switch

13

Arm (in)

21

Arm-out pressure sensor

6

Check valve

14

Arm (out)

22

6-stack pressure reducing valve

7

Oil cooler

15

Arm-in pilot pressure sensor

23

Arm semi-parallel [1] spool control

8

Main computer

16

Arm-out pilot pressure sensor

24

Arm semi-parallel [1] spool

Purpose Reduces the pressure drops while the oil flows into the arm via the P1 parallel path (mainly during a compound operation).

Secures swing pressure for arm + swing compound operation.

Independent operation (ex.: arm-out operation) When the remote control valve (12) is operated to the arm-out side, the pilot pressure oil is fed to Port pb5 and Port pb9 of the control valve (2) via the cushion valve (9) and switches the arm [1] spool (17) and arm [2] spool (18) to the out side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the arm [1] spool (17) via the center bypass oil path.

At the same time, the oil is fed to the arm [1] spool (17) via the parallel oil path and arm semi-parallel [1] spool (24).

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2), is fed to the arm [2] spool (18) via the center bypass oil path and merges downstream of the arm [1] spool (17).

The merged pressure oil flows into the arm cylinder (19) bottom side, and the arm-out operation is carried out.

The return oil on the arm cylinder (19) rod side returns to the hydraulic tank through the arm [1] spool (17).

The main computer (8) sends an electrical signal to the arm semi-parallel [1] spool control (23) and changes the opening of the arm semi-parallel [1] spool (24) according to the pilot pressure during an arm operation to control the flow volume to the arm [1] spool (17).

38

Arm Semi-parallel 1 Circuit (for compound operation) (ex.: arm-out + right swing operations) (with HBCV) 12 P

19

19 Tr1

T

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION G1

(G3)

B

B

(G3)

CW pbr2

G1

C

CCW par2

C

A

A PL

PL

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

ELEVATOR UP pbr1

ARM

SWING

20

DR

DR

4

2

1

3

21 14

25

T3

ps1

T4

DR2h

T1 T2

DR1h 2.55MPa at 30L/min

pga2

13

DOWN par1

P3 ps2

2.55MPa at 30L/min

pga1

26

CENTER CUT pcc

pdp

A5 B5 pb5 OUT

27

39.2MPa at 20L/min 39.2MPa at 20L/min

OUT

pb9

IN pa9

pa5 IN par ARM REGENERATIVE

9

17 Q

I

C

A

K

E

G

M PN

ARM 2 SUB CONTROL

pc3 ARM 1 SUB CONTROL

O

pap

18

pgb A8 39.2MPa at 20L/min 27.4MPa at 280L/min

T

RIGHT

LEFT

A

MU

pb4 DOWN

B8

BOOM(1)

BOOM(2)

B

DOWN pb8

24

pa4 UP

RIGHT

J

L

PB

B

LEFT

D

PD

PF

F

PH

H

UP

PP

29.4MPa at 350L/min

GA

P

GB

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

28

A3 LEFT

DOWN

A7

BUCKET

CLOSE pb7

pb3

CLOSE

16

15

N

UP pa8

B3

R

RIGHT

OPEN

OPEN pa7

pa3

Dr

B2 A2

29 250.0cm3/rev

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 Au

8

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

B1 A1

TRAVEL(L)

pb1 BACKWARD

22 A

B

BUCKET CLOSE-CONT

C

TRAVEL STRAIGHT

D

ARM 2 SUB-CONT

TRAVEL STRAIGHT

pst

F

E

ARM REGENE

DR3p

pa1 FORWARD

P

BOOM REGENE MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

PH

P1

P2

6

A1 T1

P1

23 C2

SWING BRAKE

C3

2-STAGE RELIEF

D1

4

11

10

5

7

CENTER CUT C12

A1 C1

3

2-STAGE TRAVEL

1 P0 67F04378

A2

A3

6

39 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

11

P2 pressure sensor

21

Arm-out pressure sensor

2

Control valve

12

Remote control valve (arm, swing)

22

6-stack pressure reducing valve

3

5-stack solenoid valve

13

Arm (in)

23

Arm semi-parallel [1] spool control

4

Lever lock solenoid valve

14

Arm (out)

24

Arm semi-parallel [1] spool

5

Console lever lock switch

15

Arm-in pilot pressure sensor

25

Left swing

6

Check valve

16

Arm-out pilot pressure sensor

26

Right swing

7

Oil cooler

17

Arm [1] spool

27

Swing pilot pressure sensor

8

Main computer

18

Arm [2] spool

28

Swing spool

9

Cushion valve

19

Arm cylinder

29

Swing motor

10

P1 pressure sensor

20

Arm load holding valve check valve

Purpose Reduces the pressure drops while the oil flows into the arm via the P1 parallel path (mainly during a compound operation).

Secures swing pressure for arm + swing compound operation.

Compound operation (ex.: arm-out + right swing operations) When the remote control valve (12) is operated to the arm-out side, the pilot pressure oil is fed to Port pb5 and Port pb9 of the control valve (2) via the cushion valve (9) and switches the arm [1] spool (17) and arm [2] spool (18) to the out side.

When the remote control valve (12) is operated to the right swing side, the pilot pressure oil is fed to Port pa3 of the control valve (2) via the cushion valve (9) and switches the swing spool (28) to the right swing side.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2), is fed to the arm [2] spool (18) via the center bypass oil path and merges with the pressure oil from A1 of the hydraulic pump (1) downstream of the arm [1] spool (17).

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the swing spool (28) via the parallel oil path.

At the same time, the oil is fed to the arm [1] spool (17) via the arm semi-parallel [1] spool (24).

The pressure oil fed to the arm [1] spool (17) merges with the pressure oil from the arm [2] spool (18) and flows into the arm cylinder (19) bottom side, and the arm-out operation is carried out.

The pressure oil fed to the swing spool (28) flows into Port B of the swing motor (29) and the right swing operation is carried out.

The main computer (8) sends an electrical signal to the arm semi-parallel [1] spool control (23) and changes the opening of the arm semi-parallel [1] spool (24) according to the pilot pressure during an arm operation to control the flow volume to the arm [1] spool (17).

When an arm operation and swing operation are carried out at the same time and the pilot pressure during the arm operation is high, swing operation pressure is secured by metering the arm semi-parallel [1] spool (24) opening to increase the flow to the swing motor (29).

Also for a swing press digging operation, pressure is secured with the same control.

40

Arm Semi-parallel 2 Circuit (for independent operation) (with HBCV)

19

19

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

12

2ND OPTION CW pbr2

(G3)

G1

P

T

B

(G3)

B

CCW par2

G1

C

C

2

PL

PL

ELEVATOR UP pbr1

20 DR

DR

ps1

21 ARM LEFT

RIGHT

pga2

3

1

pga1

4

T3

T4

DR2h

T1

T2

2.55MPa at 30L/min

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pdp

A5 B5 pb5 OUT

14

13

DOWN par1

DR1h

SWING

2

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

A

A

39.2MPa at 20L/min 39.2MPa at 20L/min

OUT

par ARM REGENERATIVE

9 Q

C

A

K

E

G

M PN

18

24

17 I

ARM 2 SUB CONTROL

pap pgb

pc3 ARM 1 SUB CONTROL

O

pb9

IN pa9

pa5 IN

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

T

B8

BOOM(1)

BOOM(2) pb4 DOWN

DOWN pb8 UP pa8

pa4 UP R

B3 A3 J

RIGHT

L

PB

D

B

PD

F

PF

LEFT

H

UP

PP

CLOSE

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

P

A7

BUCKET

pb3 LEFT

DOWN

16

15

N

PH

CLOSE pb7

pa3 RIGHT

OPEN

OPEN pa7

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

8

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4 B1 A1

TRAVEL(L)

pb1 BACKWARD A

C

B

BUCKET CLOSE-CONT

TRAVEL STRAIGHT

D

E

ARM REGENE

22

F

BOOM REGENE

ARM 1 SUB-CONT

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

6

P1 A1

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

T1

P2

PH

7

23 11

10 P1 C2

D1

4

SWING BRAKE

5 C3

2-STAGE RELIEF

CENTER CUT C12

C1

A1

3

2-STAGE TRAVEL

1 P0 F21B8980

pst

A2

A3

6

41 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

9

Cushion valve

17

Arm [1] spool

2

Control valve

10

P1 pressure sensor

18

Arm [2] spool

3

5-stack solenoid valve

11

P2 pressure sensor

19

Arm cylinder

4

Lever lock solenoid valve

12

Remote control valve (arm, swing)

20

Arm load holding valve check valve

5

Console lever lock switch

13

Arm (in)

21

Arm-out pressure sensor

6

Check valve

14

Arm (out)

22

6-stack pressure reducing valve

7

Oil cooler

15

Arm-in pilot pressure sensor

23

Arm semi-parallel [2] spool control

8

Main computer

16

Arm-out pilot pressure sensor

24

Arm semi-parallel [2] spool

Purpose Reduces the pressure drops while the oil flows into the arm via the P2 parallel path (mainly during a compound operation).

Secures pressure for arm + boom compound operation.

Independent operation (ex.: arm-out operation) When the remote control valve (12) is operated to the arm-out side, the pilot pressure oil is fed to Port pb5 and Port pb9 of the control valve (2) via the cushion valve (9) and switches the arm [1] spool (17) and arm [2] spool (18) to the out side.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the arm [2] spool (18) via the center bypass oil path.

At the same time, the oil is fed to the arm [2] spool (18) via the parallel oil path and arm semi-parallel [2] spool (24).

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2), is fed to the arm [1] spool (17) via the center bypass oil path and merges with the pressure oil from the arm [2] spool.

The merged pressure oil flows into the arm cylinder (19) bottom side, and the arm-out operation is carried out.

The return oil on the arm cylinder (19) rod side returns to the hydraulic tank through the arm [1] spool (17).

The main computer (8) sends an electrical signal to the arm semi-parallel [2] spool control (23) and changes the opening of the arm semi-parallel [2] spool (24) according to the pilot pressure during an arm operation to control the flow volume to the arm [2] spool (18).

42

Arm Semi-parallel 2 Circuit (for compound operation) (ex.: arm-out + boom-up operations) (with HBCV) 19 G1

(G3)

B

(G3)

B

19 33

Tr1

G1

C

33

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

C

2ND OPTION CW pbr2

A

A

CCW par2

PL

PL

2

ELEVATOR UP pbr1

20

DOWN par1

26

12

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

DR

DR

ps1

T3

T4

DR2h

T1

T2

G1

DR1h

P

P

T

21

T

2.55MPa at 30L/min

pga2

pga1 A5 B5

2.55MPa at 30L/min

ARM

SWING

4

LEFT

RIGHT

3

1

CLOSE

4

2

DR

ARM(2) OUT

14

13

pgb

A8 B8

39.2MPa at 20L/min 27.4MPa at 280L/min

28

BOOM(2)

BOOM(1)

pb4 DOWN

DOWN pb8

pa4 UP

9

UP

B3 I

K

Q

C

A

E

G

M PN

T

SWING

CLOSE pb7

pa3 RIGHT

OPEN pa7

RIGHT

L

PB

D

B

PD

F

PF

LEFT

H

UP

PP

TRAVEL(R)

CLOSE

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4

P

DOWN

16

15

N

PH

B1 A1

OPEN

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

29

31

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

OPTION

J

A7

BUCKET

pb3 LEFT

B2 A2

R

pa8 B7

39.2MPa at 20L/min 39.2MPa at 20L/min

32 A3

O

DR

pb9

pap

ARM 2 SUB CONTROL

pc3 ARM 1 SUB CONTROL

27

C

18

25

17

3

G1

IN pa9

par ARM REGENERATIVE

OPEN

1

(G3)

PL

39.2MPa at 20L/min 39.2MPa at 20L/min

pa5 IN

2

B A

PL

pdp

ARM(1)

GRAPPLE

B A

CENTER CUT pcc

pb5 OUT BOOM

(G3)

C

P3 ps2

TRAVEL STRAIGHT

pst

30 6 22

P1

P2

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

PH

P1

P3

P2

7

T

BOOM

A1

8

ARM A2

P1

EV A3

C2

D1

11

10

4

SWING BRAKE

5 A

C

B

BUCKET CLOSE-CONT

TRAVEL STRAIGHT

D

E

ARM REGENE

C3

F

BOOM REGENE

23

ARM 1 SUB-CONT

2-STAGE RELIEF

CENTER CUT C12

A1 P1

C1

3

2-STAGE TRAVEL

A1 T1

24 F173A71C

P0

1

A2

A3

6

43 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

12

Remote control valve (arm, swing)

23

6-stack proportional valve

2

Control valve

13

Arm (in)

24

Arm semi-parallel [2] spool control

3

5-stack solenoid valve

14

Arm (out)

25

Arm semi-parallel [2] spool

4

Lever lock solenoid valve

15

Arm-in pilot pressure sensor

26

Remote control valve (boom, bucket)

5

Console lever lock switch

16

Arm-out pilot pressure sensor

27

Boom (up)

6

Check valve

17

Arm [1] spool

28

Boom (down)

7

Oil cooler

18

Arm [2] spool

29

Boom-up pilot pressure sensor

8

Main computer

19

Arm cylinder

30

Boom-down pilot pressure sensor

9

Cushion valve

20

Arm load holding valve check valve

31

Boom [1] spool

10

P1 pressure sensor

21

Arm-out pressure sensor

32

Boom [2] spool

11

P2 pressure sensor

22

3-stack proportional valve

33

Boom cylinder

Purpose Reduces the pressure drops while the oil flows into the arm via the P2 parallel path (mainly during a compound operation).

Secures pressure for arm + boom compound operation.

Compound operation (ex.: boom-up + arm-out operations) When the remote control valve (12) is operated to the arm-out side, the pilot pressure oil is fed to Port pb5 and Port pb9 of the control valve (2) and switches the arm [1] spool (17) and arm [2] spool (18).

When the remote control valve (26) is operated to the boom-up side, the pilot pressure oil is fed to Port pa8 and Port pa4 of the control valve (2) and switches the boom [1] spool (31) and boom [2] spool (32).

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the boom [2] spool (32) and arm [1] spool (17) via the parallel oil path.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the boom [1] spool (31) and arm [2] spool (18) via the parallel oil path.

The pressure oil fed to the arm [1] spool (17) merges with the pressure oil from the arm [2] spool (18) and flows into the arm cylinder (19) bottom side, and the arm-out operation is carried out.

The pressure oil fed to the boom [1] spool (31) merges with the pressure oil from the boom [2] spool (32) and flows into the boom cylinder (33) bottom side, and the boom-up operation is carried out.

The main computer (8) sends an electrical signal to the arm semi-parallel [2] spool control (24) and changes the opening of the arm semi-parallel [2] spool (25) according to the pilot pressure during an arm operation to control the flow volume to the arm [2] spool (18).

When a boom-up operation is carried out, the arm semi-parallel [2] spool (25) opening is metered to increase the flow to the boom cylinder (33) for the smooth operation of the boom.

44

Arm-out Regenerative Circuit (with HBCV) 26

20

19

A5

G1

(G3)

B

(G3)

B

19

G1

C

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

C

2ND OPTION CW pbr2

B5

A

A

CCW par2

PL

PL

pb5 OUT DR

2

DR

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

20

ELEVATOR UP pbr1

pa5 IN

DOWN par1

par

T3

ps1

21 17

17 I

Q

K

C

A

E

G

M PN

T1

T2 P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1 A5 B5 pb5 OUT

24

DR2h

2.55MPa at 30L/min

pga2

25

T4

DR1h

pdp 39.2MPa at 20L/min 39.2MPa at 20L/min

ARM(2) OUT

pb9

IN pa9

pa5 IN ARM REGENERATIVE

O

par ARM 2 SUB CONTROL

pap

18

T

pgb

24pc3 ARM 1 SUB CONTROL

A8

9

39.2MPa at 20L/min 27.4MPa at 280L/min

R J

RIGHT

L LEFT

PB IN

B

D

PD OUT

F

PF UP

H

PH N DOWN CLOSE

PP P

pb4 DOWN

DOWN pb8 UP pa8

pa4 UP

OPEN

B3 A3

16

15

B8

BOOM(1)

BOOM(2)

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A7

BUCKET

pb3 LEFT

CLOSE pb7

pa3 RIGHT

OPEN pa7

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

22

A

B

BUCKET CLOSE-CONT

D

C

TRAVEL STRAIGHT

E

ARM 2 SUB-CONT

F

BOOM REGENE

ARM 1 SUB-CONT

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

P4

8

P1

B1 A1

TRAVEL(L)

pb1 BACKWARD A1

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

pst

T1

23 12

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

PH

P1 P

P1

T C2

P2

6

4

D1

SWING BRAKE

5 C3

2-STAGE RELIEF

7

CENTER CUT C12

ARM

4

2

RIGHT

3

1 C1

A1

2-STAGE TRAVEL

3 13

14 P0

1 D8F6BFDE

11

10

SWING LEFT

A2

A3

6

45 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

10

P1 pressure sensor

19

Arm cylinder

2

Control valve

11

P2 pressure sensor

20

Arm load holding valve check valve

3

5-stack solenoid valve

12

Remote control valve (arm, swing)

21

Arm-out pressure sensor

4

Lever lock solenoid valve

13

Arm (in)

22

6-stack pressure reducing valve

5

Console lever lock switch

14

Arm (out)

23

Arm regeneration spool control

6

Check valve

15

Arm-in pilot pressure sensor

24

Arm regeneration spool

7

Oil cooler

16

Arm-out pilot pressure sensor

25

Regeneration orifice

8

Main computer

17

Arm [1] spool

26

Regeneration check valve

9

Cushion valve

18

Arm [2] spool

When the remote control valve (12) is operated to the arm-out side, the pilot pressure oil is fed to Port pb5 and Port pb9 of the control valve (2) and switches the arm [1] spool (17) and arm [2] spool (18) to the out side.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the arm [2] spool (18) via the center bypass oil path.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2), is fed to the arm [1] spool (17) via the center bypass oil path and merges with the pressure oil from the arm [2] spool (18).

The merged pressure oil flows into the arm cylinder (19) bottom side, and the arm-out operation is carried out.

The return oil on the arm cylinder (19) rod side returns to the hydraulic tank through the arm load holding valve check valve (20), arm [1] spool (17), and arm regeneration spool (24).

At this time, the return oil is metered by the regeneration orifice (25), pushes open the arm regeneration check valve (26), and is regenerated on the bottom side, securing the arm speed for leveling work, etc.

When the load pressure on the arm cylinder (19) bottom side becomes high, the arm regeneration spool (24) is switched to the right and the return opening becomes larger.

This closes the regeneration check valve (26) and the return oil on the arm cylinder (19) rod side returns to the hydraulic tank through the arm [1] spool (17) and arm regeneration spool (24) without regeneration.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

46

Arm-in Interference Prevention Circuit (with HBCV) 19

19 Tr1

9

G1

(G3)

B

B

A

A

C I

A

K

Q

C

E

G

M PN

2ND OPTION

C

O

PL

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

G1

(G3)

CW pbr2 CCW par2

PL

T DR

DR

ELEVATOR

20

R J

RIGHT

L

B

PB

LEFT

D

PD

PF

F

H

UP

PH

N

ps1

OPEN

21 15

UP pbr1 DOWN par1

PP P

DOWN CLOSE

T3

T4

DR2h

T1

T2

DR1h

pga2

16

2.55MPa at 30L/min

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

P2

P1

pdp

A5 B5

22

P3

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

T

39.2MPa at 20L/min 39.2MPa at 20L/min

OUT pb9

pb5 OUT

pa5 IN BOOM A1

ARM

EV

17

A3

A2

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

pap

18

pgb

pc3 ARM 1 SUB CONTROL

A8

24

39.2MPa at 20L/min 27.4MPa at 280L/min

28

BOOM(2)

B8

BOOM(1)

pb4 DOWN

25

DOWN pb8

pa4 UP

UP pa8

8

26

B3 A3

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A7

BUCKET

pb3 LEFT

27

CLOSE pb7

pa3 RIGHT

23

OPEN pa7

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

6

P4

12 P

P1

SWING 4

5

LEFT

RIGHT

3

1

C2

SWING BRAKE

C3

2-STAGE RELIEF

6

B1 A1

TRAVEL(L)

pb1 BACKWARD D1

DR3p

pa1 FORWARD

T

ARM

2

4

TRAVEL STRAIGHT

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

CENTER CUT BOOST

C12

P1

pst

P2

PH

3 C1

13

2-STAGE TRAVEL

14 10

11 A1

P0

504C1D9A

1

A2

A3

A4

7

47 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

11

P2 pressure sensor

21

Arm-in pressure sensor

2

Control valve

12

Remote control valve (arm, swing)

22

3-stack proportional valve

3

5-stack solenoid valve

13

Arm (in)

23

Computer C

4

Lever lock solenoid valve

14

Arm (out)

24

Angle sensor (bucket)

5

Console lever lock switch

15

Arm-in pilot pressure sensor

25

Angle sensor (arm)

6

Check valve

16

Arm-out pilot pressure sensor

26

Angle sensor (boom)

7

Oil cooler

17

Arm [1] spool

27

Angle sensor (EV)

8

Main computer

18

Arm [2] spool

28

Monitor display

9

Cushion valve

19

Arm cylinder

10

P1 pressure sensor

20

Arm load holding valve check valve

Arm in When the remote control valve (12) is operated to the arm-in side, the pilot pressure oil is fed to Port pa5 and Port pa9 of the control valve (2) via the cushion valve (9) and 3-stack proportional valve (22) and switches the arm [1] spool (17) and arm [2] spool (18) to the in side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the arm [1] spool (17) via the center bypass oil path.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the arm [2] spool (18) via the center bypass oil path.

The merged pressure oil merges downstream of the spool and then flows into the arm cylinder (19) rod side through the arm load holding valve check valve (20), and the arm-in operation is carried out.

The return oil on the arm cylinder (19) bottom side returns to the hydraulic tank through the arm [1] spool (17).

Interference prevention Computer C (23) detects the positions of the attachment and elevator cab by electrical signals from the angle sensors (24) (25) (26) (27).

When the cab and end attachment come closer to each other during an arm-in operation, the main computer (8) stops the arm by closing the opening of the 3-stack proportional valve (22).

When a sensor abnormality or electrical circuit abnormality occurs, computer C (23) sends an electrical signal to the main computer (8) to operate the lever lock solenoid valve (4) and stop all the operations.

Also, a message is displayed on the monitor display (28) and the warning buzzer sounds at the same time.

Note that cushioning performance can be adjusted by adjusting the output current or control angle on the service support screen.

48

Arm-in Shock Reduction Circuit (with HBCV) 19

9

G1

(G3)

B

B

A

K

Q

C

E

G

M PN

2ND OPTION CW pbr2

A

A

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

C

PL

O

Tr1

G1

(G3)

C

I

19

PL

CCW par2

T DR

DR

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

20

2

ELEVATOR UP pbr1

R J

RIGHT

L

B

PB

LEFT

D

PD

PF

F

H

UP

PH

N

DOWN par1

PP P

DOWN CLOSE

21

OPEN

ps1

T3

T4

DR2h

T1

T2

DR1h

15

pga2

16

2.55MPa at 30L/min

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

P2

P1 T

BOOM A1

ARM

EV

17

A3

A2

pdp

A5 B5

22

P3

39.2MPa at 20L/min 39.2MPa at 20L/min

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

pap

18

pgb

pc3 ARM 1 SUB CONTROL

A8

24

39.2MPa at 20L/min 27.4MPa at 280L/min

28

BOOM(2)

B8

BOOM(1)

pb4 DOWN

25

DOWN pb8

pa4 UP

UP pa8

8

26

B3 A3

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A7

BUCKET

pb3 LEFT

27

CLOSE pb7

pa3 RIGHT

23

OPEN pa7

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

6

P4

12 P

P1

SWING 4

5

LEFT

RIGHT

3

1

C2

SWING BRAKE

C3

2-STAGE RELIEF

6

B1 A1

TRAVEL(L)

pb1 BACKWARD D1

DR3p

pa1 FORWARD

T

ARM

2

4

TRAVEL STRAIGHT

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

CENTER CUT BOOST

C12

P1

pst

PH

P2

3 C1

13

2-STAGE TRAVEL

14 10

11 A1

P0

85D49CAD

1

A2

A3

A4

7

49 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

11

P2 pressure sensor

21

Arm-in pressure sensor

2

Control valve

12

Remote control valve (arm, swing)

22

3-stack proportional valve

3

5-stack solenoid valve

13

Arm (in)

23

Computer C

4

Lever lock solenoid valve

14

Arm (out)

24

Angle sensor (bucket)

5

Console lever lock switch

15

Arm-in pilot pressure sensor

25

Angle sensor (arm)

6

Check valve

16

Arm-out pilot pressure sensor

26

Angle sensor (boom)

7

Oil cooler

17

Arm [1] spool

27

Angle sensor (EV)

8

Main computer

18

Arm [2] spool

28

Monitor display

9

Cushion valve

19

Arm cylinder

10

P1 pressure sensor

20

Arm load holding valve check valve

Arm in When the remote control valve (12) is operated to the arm-in side, the pilot pressure oil is fed to Port pa5 and Port pa9 of the control valve (2) via the cushion valve (9) and 3-stack proportional valve (22) and switches the arm [1] spool (17) and arm [2] spool (18) to the in side.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2) and is fed to the arm [1] spool (17) via the center bypass oil path.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the arm [2] spool (18) via the center bypass oil path.

The merged pressure oil merges downstream of the spool and then flows into the arm cylinder (19) rod side through the arm load holding valve check valve (20), and the arm-in operation is carried out.

The return oil on the arm cylinder (19) bottom side returns to the hydraulic tank through the arm [1] spool (17).

Shock reduction Computer C (23) detects the arm angle by electrical signals from the angle sensor (25).

When the arm is close to the arm-out end, the main computer (8) controls the opening area of the 3stack proportional valve (22) from P2 to A2 to reduce the shock generated when an arm operation is started.

Note that cushioning performance can be adjusted by adjusting the output current or control angle on the service support screen.

50

Arm-out End Shock Reduction Circuit (with HBCV)

9

19

I

G1

C

A

K

Q

E

G

M PN

(G3)

B

O

B

19

Tr1

G1

(G3)

C

CW pbr2 C

T

A

CCW par2

A PL

PL

DR

DR J

L

PB

D PD

B

LEFT

PF

F

H

PH

UP

N

ELEVATOR

20

UP pbr1

PP P

DOWN CLOSE

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

2

R

RIGHT

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

2ND OPTION

DOWN par1

OPEN

ps1

T3

T4

DR2h

T1

T2

DR1h

15

16

21

2.55MPa at 30L/min

pga2

P3 ps2

2.55MPa at 30L/min

CENTER CUT pcc

pga1

25

pdp

A5 B5

26 17

27

39.2MPa at 20L/min 39.2MPa at 20L/min

pb5 OUT

OUT pb9

pa5 IN

IN pa9

par ARM REGENERATIVE ARM 2 SUB CONTROL

23

28 24

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

BOOM(2)

B8

BOOM(1)

pb4 DOWN

8

DOWN pb8

pa4 UP

UP pa8

B3 A3 A

B

BUCKET CLOSE-CONT

E

ARM 2 SUB-CONT

A7

BUCKET

pb3 LEFT

F

BOOM REGENE

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

D

C

TRAVEL STRAIGHT

18

pgb

pc3 ARM 1 SUB CONTROL

29

pap

ARM 1 SUB-CONT

CLOSE pb7

pa3 RIGHT

OPEN pa7

B2 A2

P1

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION

A1

pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

6

T1

P4

6

B1 A1

22

TRAVEL(L)

pb1 BACKWARD

4 P1

12 C2

P

5

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

pst

D1

SWING BRAKE

T

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST C3

2-STAGE RELIEF

P1

CENTER CUT

PH

P2

C12

ARM

2

SWING 4

LEFT

RIGHT

3

1

3 C1

2-STAGE TRAVEL

10

11 A1

13

14

1 P0

2557AD59

A2

A3

A4

7

51 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line 1

Hydraulic pump

11

P2 pressure sensor

21

Arm-out pressure sensor

2

Control valve

12

Remote control valve (arm, swing)

22

Arm regeneration spool control

3

5-stack solenoid valve

13

Arm (in)

23

Arm regeneration spool

4

Lever lock solenoid valve

14

Arm (out)

24

Computer C

5

Console lever lock switch

15

Arm-in pilot pressure sensor

25

Angle sensor (bucket)

6

Check valve

16

Arm-out pilot pressure sensor

26

Angle sensor (arm)

7

Oil cooler

17

Arm [1] spool

27

Angle sensor (boom)

8

Main computer

18

Arm [2] spool

28

Angle sensor (EV)

9

Cushion valve

19

Arm cylinder

29

Monitor display

10

P1 pressure sensor

20

Arm load holding valve check valve

Arm out When the remote control valve (12) is operated to the arm-out side, the pilot pressure oil is fed to Port pb5 and Port pb9 of the control valve (2) and switches the arm [1] spool (17) and arm [2] spool (18) to the out side.

The discharge oil from A2 of the hydraulic pump (1) flows into Port P2 of the control valve (2) and is fed to the arm [2] spool (18) via the center bypass oil path.

The discharge oil from A1 of the hydraulic pump (1) flows into Port P1 of the control valve (2), is fed to the arm [1] spool (17) via the center bypass oil path and merges with the pressure oil from the arm [2] spool (18).

The merged pressure oil flows into the arm cylinder (19) bottom side, and the arm-out operation is carried out.

The return oil on the arm cylinder (19) rod side returns to the hydraulic tank through the arm load holding valve check valve (20), arm [1] spool (17), and arm regeneration spool (23).

End shock reduction Computer C (24) detects the arm angle by electrical signals from the angle sensor (26).

When the arm is raised close to the arm-out end, the main computer (8) meters the opening of the arm regeneration spool (23).

This decreases the arm-out speed and reduces the shock on the arm-out stroke end.

Note that cushioning performance can be adjusted by adjusting the output current or control angle on the service support screen.

52

Negative Control Circuit Negative Control Circuit

Tr1

BR2 AR2

22.6MPa at 20L/min 22.6MPa at 20L/min

5

2ND OPTION

4

CW pbr2 CCW par2

P1

BR1 AR1

20.6MPa at 20L/min 20.6MPa at 20L/min

11

2

C3

2-STAGE RELIEF

D1

UP pbr1 DOWN par1

T3

SWING BRAKE

ELEVATOR

9 ps1

C2

T4

DR2h

12

T1 T2

CENTER CUT C12

DR1h

P3 2.55MPa at 30L/min

pga2 pga1

ps2

2.55MPa at 30L/min

CENTER CUT pcc

10

C1

2-STAGE TRAVEL

pdp

A5 39.2MPa at 20L/min 39.2MPa at 20L/min

B5

ARM(2)

ARM(1) pb5 OUT

OUT pb9

pa5 IN

IN pa9

3

P0

par ARM REGENERATIVE ARM 2 SUB CONTROL

pap

6

pgb

pc3 ARM 1 SUB CONTROL

A8 39.2MPa at 20L/min 27.4MPa at 280L/min

B8

BOOM(1)

BOOM(2) pb4 DOWN

7

DOWN pb8 UP pa8

pa4 UP B3 A3

B7

39.2MPa at 20L/min 39.2MPa at 20L/min

SWING

A7

BUCKET

pb3 LEFT

CLOSE pb7

pa3 RIGHT

OPEN pa7

B2 A2

B6 A6

39.2MPa at 20L/min 39.2MPa at 20L/min

TRAVEL(R)

OPTION pb2 GRAPPLE OPEN

BACKWARD pb6

pa2 GRAPPLE CLOSE

FORWARD pa6

1

13

P4 (FRONT)

B1 A1

TRAVEL(L)

pb1 BACKWARD

DR3p

pa1 FORWARD

TRAVEL STRAIGHT

a1

A1

A2

a2

Psv2

(REAR)

8

pst

MAIN RELIEF V. 34.3MPa at 230L/min 37.3MPa at 210L/min

BOOST

P1

Psv1

14

PH

P2 a5

A3

M

a3 Dr

B1

15

15 IN

4FE3A51B

B3

OUT

Dr3

6

53 Pressure line

Pilot tank line

Tank line

Electric line

Pilot pressure line

Negative control line

1

Hydraulic pump

6

Check valve

11

N1 negative control pressure sensor

2

Control valve

7

Oil cooler

12

N2 negative control pressure sensor

3

5-stack solenoid valve

8

Main computer

13

P1 flow control proportional valve

4

Lever lock solenoid valve

9

P1 negative control relief valve

14

P2 flow control proportional valve

5

Console lever lock switch

10

P2 negative control relief valve

15

Swash plate

When the remote control valve operation lever is set to neutral, the discharge oil from A1 and A2 of the hydraulic pump (1) returns to the hydraulic tank through Port P1 and Port P2 of the control valve (2), the center bypass oil path, the downmost stream P1 negative control relief valve (9) and P2 negative control relief valve (10).

The negative control pressure oil separated from the center bypass oil path is fed to the N1 negative control pressure sensor (11) through Port ps1 of the control valve (2) and to the N2 negative control pressure sensor (12) through Port ps2.

Then, the P1 flow control proportional valve (13) and P2 flow control proportional valve (14) on the hydraulic pump (1) operate. As a result, the angle of the hydraulic pump (1) swash plate (15) becomes smaller, reducing the pump discharge flow.

54

Other Circuits As an example, this section explains the following items. ･ Cushion circuit (ex.: when stopping arm-out operation) ･ Heat circuit (lever in neutral) ･ Auto pressure boost circuit (arm in) (with HBCV) ･ Elevator cab up/down circuit ･ LM circuit

55

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL

• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.

CLICK HERE TO

DOWNLOAD THE COMPLETE MANUAL