04IMPL

(1)

The hydraulic system main control valve is similar to the 300A control valve

arrangement that includes the attachment control valve as standard equipment.

The control valve group has two negative flow control valves, a straight travel

valve, a parallel tandem logic valve and a selector valve.

Service Training

MALAGA

320B/330B

Francis

June 97

IV. IMPLEMENT & TRAVEL SYSTEM

(2)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

1. Stick 2 Control Valve 2. Boom 1 Control Valve 3. Bucket Control Valve 4. Attachment Control Valve 5. Right Travel Control Valve 6. Left travel Control Valve 7. Swing Control Valve 8. Stick 1 Control Valve 9. Boom 2 Control Valve

10. Upper Pump 11. Lower Pump 12. Pilot Pump

13. Straight Travel Valve 14. Main Control Valves a. Center Bypass Passage b. Center Bypass Passage c. NFC Orifice d. NFC Orifice e. Return Passage

4 ₃

₂

5

6

7

8

9

11

10

12

13

1 d

b

a

14 (IN NEUTRAL)

MAIN CONTROL VALVE FLOW ILLUSTRATION

c

2

(3)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

3

19

16

20

15 g

f

10

18

17

11 e

INDIVIDUAL CONTROL VALVE OPERATION

( Bucket Cylinder Operation As A Typical Example )

14 a

15. Combined Check Valve 16. Main Relief Valve

17. Line Relief Valve (Rod End) 18. Line relief Valve (Head End) 19. Load Check Valve

20. Bucket Cylinder. f. Parallel Feed Passage g. Return Line

(4)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

c

a

b

h

d

21 i

22

11

10

14 NEGATIVE FLOW CONTROL OPERATION

21. NFC Relief Valve (Lower Pump) 22. NFC Relief Valve (Upper Pump) h. NFC Passage

i. NFC Passage

4

(5)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

4

3

2 c

b

5

6

7

8 a

9

12

11

10

13

26

1

24

25

14 f

j

d

k

l

k

27

24. Logic Valve.

25. Pressure Control Valve. 26. Check valve.

27. Check Valve

j. Parallel Feed Passage. k. Combined Flow Passage. l. Combined Flow Passage.

COMBINED FLOW OPERATION

CIRCUIT FLOW ILLUSTRATION )

(6)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

17

18

4

2

3

16

5

6

7

8

9

29

28

1

32

30

31 e

l

14

33

34 m

35 MAIN

CONTROL

VALVE

( Outside View )

1. Stick 2 Control Valve

2. Boom 1 Control Valve 3. Bucket Control Valve 4. Attachment Control Valve 5. Right Travel Control Valve 6. Left travel Control Valve 7. Swing Control Valve 8. Stick 1 Control Valve 9. Boom 2 Control Valve

14. Main Control Valve (Left Section) 16. Main Relief Valve

17. Line Relief Valve (Bkt rod end).

18. Line Relief Valve (Bkt head end) 28. Line Relief Valve (stk head end) 29. Line Relief Valve (Stk rod end) 30. Inlet Port (Upper pump) 31. Inlet Port (Lower pump) 32. Boom Drift Reduction Valve 33. Stick Combination Flow Port. 34. PTL Signal Port

35. MCV (Right Section0

37. Stick Line Relief Valve (Rod End) 38. Stick Drift Reduction Valve 39. Line Relief Valve (Bm head end)

37

38

e. Return Port l. Return Port

m. Outlet Combination Port

39

6

(7)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

6 j

c

f

4

2

3

5

13

7

8

9

1 e

_l

30

31 b

d

a

35

14

19

36

1. Stick-2 Spool 14. Left MCV Section 19. Load Check Valve 35. Right MCV Section 36. Logic Circuit

a. Center Bypass Passage (Lft Sec) b. Center Bypass Passage (Rgh Sec)

(CROSS SECTION)

MAIN CONTROL VALVE

(8)

8 Page:

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

1. Stick 2 Control Valve

2. Boom 1 Control Valve

3. Bucket Control Valve

4. Attachment Control Valve

5. Right Travel Control Valve

6. Left travel Control Valve

7. Swing Control Valve

8. Stick 1 Control Valve

9. Boom 2 Control Valve

10. Upper Pump

11. Lower Pump

12. Pilot Pump

13. Straight Travel Valve

14. Main Control Valves

15. Combined Check Valve

16. Main Relief Valve

17. Line Relief Valve (Rod End)

18. Line relief Valve (Head End)

19. Load Check Valve

20. Bucket Cylinder.

21. NFC Relief Valve (Lower Pump)

22. NFC Relief Valve (Upper Pump)

23. Selector Valve.

24. Logic Valve.

25. Pressure Control Valve.

26. Check valve.

27. Check Valve.

28. Line Relief Valve (stk head end)

29. Line Relief Valve (Stk rod end)

30. Inlet Port (Upper pump)

31. Inlet Port (Lower pump)

32. Line Relief Valve (Boom rod end)

33. Stick Combination Flow Port.

34. PTL Signal Port

35. MCV (Right Section

a. Center Bypass Passage

b. Center Bypass Passage

c. NFC Orifice

d. NFC Orifice.

e. Return Port

f. Parallel Feed Passage

g. Return Line

h. NFC Passage

i. NFC Passage

j. Parallel Feed Passage.

k. Combined Flow Passage.

l. Combined Flow Passage.

m. Outlet Combination Port

(9)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

a

c

d

b

1 NEGATIVE FLOW CONTROL RELIEF VALVE

( Partial Cross Section Of Stick 2 Control Valve )

b

a

1 c

1. Poppet 2. Stem a. Orifice

b. Passage (From center bypass passage) c. Return Passage

d. Negative Control Signal Pressure

c

a

b

2 d

1

9 Page:

(10)

CHAPTER : Implement & T

ravel System

320B330B HYDRAULIC

EXCA

V

A

T

ORS

1 f

3

2 e

a

_b

g

c

d

BUCKET CONTROL VALVE

( Neutral Position )

4

5

6 a

e

b

7

1. Bucket Control Valve 2. Centering Spring 3. Load Check Valve

4. Line Relief Valve (Head end) 5. Line Relief Valve (Rod end) 6. Stem

a. Pilot Port (Bucket close) b. Pilot Port (Bucket open) c. Port (To head end) d. Port (To rod end) e. Center Bypass Passage f. Return Passage

g. Parallel feeder passage

10

(11)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

W

a

2

3

2

1 d

a

b

c

BOOM 1 CONTROL VALVE

(Boom Raise Position)

5 b

c

6

4

1. Boom 1 Control Valve 2. Load Check Valve 3. Bucket Control Valve 4. Regeneration Check Valve 5. Spool

6. Regeneration Valve 7. Boom Anti-dift Valve a. Parallel Feeder Passage b. Center Bypass Passage c. Pilot Passage d. Vent Hole

7

11 Page:

(12)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

BOOM REGENERATION CIRCUIT

(Hold)

6

8

2 d

c

7 b

a

5

3

4

1 a

2 b

1

1. Boom 1 Control Valve 2. Load Check Vave 3. Boom Generation Valve 4. Spool

5. Boom Generation Valve 6. Boom Drift Reduction Valve 7. Boom Down Line Relief Valve 8. Top Pump

a. Parallel feeder Path b. Open Center flow Path c. Tank Return Orifices d. Regeneration Orifices

12 Page:

(13)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

a. Parallel feeder Path b. Open Center flow Path c. Tank Return Orifices d. Regeneration Orifices e. Regeneration Passage f. Vent Hole

BOOM REGENERATION CIRCUIT

(Boom Lower)

e

6

8

2 d

c

7 b

a

5

3

4

1 a

2 b

1 f

13 Page:

(14)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

a. Parallel feeder Path b. Open Center flow Path c. Tank Return Orifices d. Regeneration Orifices e. Regeneration Passage f. Vent Hole

BOOM REGENERATION CIRCUIT

(Boom Lower Down Pressure)

6 e

8

2 d

c

7 b

a

5

3

4

1 a

2 b

1 f

14 Page:

(15)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

1

3 b

4

2 a

5 SWING CIRCUIT SCHEMATIC

6

7

10

9 c

1. Swing Motor Rotary Group. 2. Swing Anti-reaction Valve Spool 3. Line Relief Valve

4. Main Control Valve 5. Slow Return Check Valve 6. Lower Pump 7. Upper Pump 9. Solenoid Valve 10. Swing Brake a. Port b. Port c. Makeup Port

15 Page:

(16)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

SWING MOTOR

(CROSS SECTION FRONT VIEW)

4

1 a

2 b

3 c

5

1. Stem 2. Spring 3. Piston 4. Make-Up Valve 5. Sleeve a. Inlet Port

b. Return Passage (Make-Up Port) c. Piston Chamber

16 Page:

(17)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

2

1

3

4 d

₅

a

b

1. Poppet 2. Plug 3. Sleeve 4. Spring 5. Stem

a. Inlet Port (From Hyd. Control Valve) b. Return Passage (Make-Up Port) d. Orifice e. Orifice

e

1

3 d

a

b

e

MAXIMUM RELIEF PRESSURE

MINIMUM RELIEF PRESSURE

SWING RELIEF VALVE

17 Page:

(18)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

TRAVEL MOTOR

(Cross Section)

1

2

3 ₄

5

6

7

8

9

10

11

12

13

14

15

16

20

18

19 ₁₇

21

1. Drive Shaft 2. Ball Guide 3. Spring 4. Barrel 5. Slipper 6. Retainer 7. Piston 8. Friction Plate 9. Separator Plate 10. Piston Guide 11. Spring 12. Brake Piston 13. Brake Pilot Valve 14. Check Valve 15. Check Valve 16. Piston 17. Piston 18. Spring 19. Spring 20. Ball 21. Ball

18 Page:

(19)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

TRAVEL MOTOR

Low Speed

1. Swashplate Servo Piston 2. Speed Change Valve 3. Check Valve

4. Brake Valve

a. From Left Tavel Control Valve b. From Two Speed Solenoid c. From Right Travel Control Valve d. Center Port

a

b

c

1

2

3

3 d

19 Page:

(20)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

TRAVEL MOTOR

High Speed

1. Swashplate Servo Piston 2. Speed Change Valve 3. Check Valve

4. Brake Valve

a. From Left Tavel Control Valve b. From Two Speed Solenoid c. From Right Travel Control Valve d. Center Port

a

b

c

1

2

3

3 d

20 Page:

(21)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

1

2

3

4 a

5

7 b

8

9 c

10

11 AUTOMATIC CHANGE

TRAVEL SPEED VALVE

1. Upper Pump 2. Lower Pump 3. Pilot Pump 4. Shuttle Valve

5. Two speed solenoid valve (III) 6. Aut. Travel Speed Change Val Sensor 7. Travel Control Valve

8. Swivel

9. Speed Change Valve 10. Brake Pilot Valve 11. Crossover Relief Valve a. Pilot Line

b. To Speed Change Valves c. Speed Change Valve Port

6 (Schematic)

21 Page:

(22)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

AUTOMATIC SPEED CHANGE VALVE

Low Speed - Low System Pressure

g

5

7

5. Two speed solenoid valve

6. AutTravel Speed Change Vale Press Sensor 7. Control Valve.

9. Speed Change Valve g. To Left Travel Motor

9

6

22 Page:

(23)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

AUTOMATIC SPEED CHANGE VALVE

High Speed - Low System Pressure

g

5

7

9

6

23 Page:

(24)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

AUTOMATIC SPEED CHANGE VALVE

High Speed - High System Pressure

g

5

7

9

6

24 Page:

(25)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

5

9 i

a

3

4 e

5

6 f

2 i

5 h

6 i

8

10

11

12

2. Spool

3. Piston (Low Speed) 4. Piston (High Speed) 5. Brake Pilot Valve 6. Check Valves 9. Orifice

10. Friction Plates 11. Separator Plates a. Pilot Port

e. Port (From Travel Motor) f. Port (To Travel Motor) h. Passage (To Brake Piston) i. Port (To Pilot Valve)

PARKING BRAKE

25 Page:

(26)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

4

1

2

3 a

b

10

11 Pilot from one or

more implements

Impl.

R

L

Impl.

L+R

Travel

STRAIGHT TRAVEL VALVE

(Introduction)

1. Right Travel Control Valve 2. Straight Travel Valve 3. Left Travel Control Valve 4. Main Control Valve

10. Upper Pump 11. Lower Pump

a. Line (To the left control valve section) b. Line (To the right control valve section)

&

MAIN RELIEF VALVE

26 Page:

(27)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

SPB SPB

1

2

3

4

5

6

7

8

9

10

11 STRAIGHT TRAVEL CIRCUIT

a

b

e

d

c

f

g

h

_i

j

k

1. Boom 1 2. Bucket 3. Attach 4. Right Travel 5. Travel Press. Sw 6. Imp. Press. Sw 7. Straight Travel 8. Left Travel 9. Swing 10. Stick 1 11. Boom 2 a. To Bucket Cyl b. To right Trv Motor c. To Left Paral Feed. Path d. To Swing Park Brake e. To Left Travel Motor f. From Left Trv Pilot Ctrl g. From Pilot Manifold h. From Top Pump i. From Bottom Pump j. From Right Trv Pilot Ctrl k. From Bucket Pilot Ctrl

(Travel Position Only)

27 Page:

(28)

CHAPTER : Implement & Travel System

320B330B HYDRAULIC

EXCAVATORS

SPB SPB

1

2

3

4

5

6

7

8

9

10

11 STRAIGHT TRAVEL CIRCUIT

a

b

e

d

c

f

g

h

_i

j

k

1. Boom 1 2. Bucket 3. Attach 4. Right Travel 5. Travel Press. Sw 6. Imp. Press. Sw 7. Straight Travel 8. Left Travel 9. Swing 10. Stick 1 11. Boom 2 a. To Bucket Cyl b. To right Trv Motor c. To Left Paral Feed. Path d. To Swing Park Brake e. To Left Travel Motor f. From Left Trv Pilot Ctrl g. From Pilot Manifold h. From Top Pump i. From Bottom Pump j. From Right Trv Pilot Ctrl k. From Bucket Pilot Ctrl

(Travel/Impl Position)

28 Page: