Hyundai Excavator R210LC-7. Service and repair manual - page 11

3 - 23

The oil from the front and rear pump flows through the neutral oil passage, bypass oil passage and
confluence oil passage in the main control valve.     Then the oil goes to each actuator and operates
them.     Check valves and orifices are located on these oil passage in the main control valve.
These control the oil from the main pumps so as to correspond to the operation of each actuator and
smooth the combined operation.

STRAIGHT TRAVEL SPOOL

This straight travel spool for straight travel is provided in the main control valve.
If any actuator is operated when traveling, the straight travel spool is pushed to the left by the pilot oil
pressure.  
Consequently, the left and right travel oil supply passage are connected, and equivalent amount of
oil flows into the left and right travel motors.     This keeps the straight travel.

1. OUTLINE

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

Px

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

STRAIGHT
TRAVEL
SPOOL

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

GROUP  5   COMBINED OPERATION

3 - 24

When the swing and boom functions are operated, simultaneously the swing spool and boom spools
in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the front pump flows into the swing motor through swing spool and the boom cylinder
through boom 2 spool.
The oil from the rear pump flows into the boom cylinders through the boom 1 spool in the right
control valve.
The superstructure swings and the boom is operated.

2. COMBINED SWING AND BOOM OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

Px

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

3 - 25

When the swing and arm functions are operated, simultaneously the swing spool and arm spools in
the main control valve are moved to the functional position by the pilot oil pressure from the remote
control valve.
The oil from the front pump flows into the swing motor through swing spool and the arm cylinder
through arm 1 spool.
The oil from the rear pump flows into the arm cylinder through the arm 2 spool of the right control
valve.
The superstructure swings and the arm is operated.

3. COMBINED SWING AND ARM OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

Px

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

3 - 26

When the swing and bucket functions are operated, simultaneously the swing spool and bucket
spool in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the front pump flows into the swing motor through the swing spool in the left control
valve.
The oil from the rear pump flows into the bucket cylinder through the bucket spool in the right control
valve.

4. COMBINED SWING AND BUCKET OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

Px

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

3 - 27

When the swing, boom, arm and bucket functions are operated, simultaneously each spool in the
main control valve is moved to the functional position by the pilot oil pressure from the remote control
valve.
The oil from the front pump flows into the swing motor, boom cylinders and arm cylinder through the
swing spool, boom 2 spool, arm 1 spool, and the parallel and confluence oil passage in the left
control valve.  The oil from the rear pump flows into the boom cylinders, arm cylinder and bucket
cylinder through the boom 1 spool, arm 2 spool, bucket spool and the parallel and confluence oil
passage in the right control valve.
The superstructure swings and the boom, arm and bucket are operated.

5. COMBINED SWING, BOOM, ARM AND BUCKET OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

Px

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

3 - 28

When the swing and travel functions are operated, simultaneously the swing spool and travel spools
in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve and straight travel spool is pushed to the left by the pilot oil pressure from the
pilot pump.
The oil from the front pump flows into the swing motor through the swing spool.  The oil from the rear
pump flows into the travel motor through the RH travel spool of the right control valve and the LH
travel spool of the left control valve via the straight travel spool.
The superstructure swings and the machine travels straight.

6. COMBINED SWING AND TRAVEL OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

3 - 29

When the boom and travel functions are operated, simultaneously the boom spools and travel
spools in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve and the straight travel spool is pushed to the left by the oil pressure from pilot
pump.
The oil from the front pump flows into the boom cylinders through the boom 2 spool and boom 1
spool via the parallel and confluence oil passage in case boom up operation.   The oil from the rear
pump flows into the travel motors through the RH travel spool of the right control valve and the LH
travel spool of the left control valve via the straight travel spool.

7. COMBINED BOOM AND TRAVEL OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

3 - 30

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

When the arm and travel functions are operated, simultaneously the arm spools and travel spools in

the main control valve are moved to the functional position by the pilot oil pressure from the remote
control valve and the straight travel spool is pushed to the left by the oil pressure from pilot pump.
The oil from the front pump flows into the arm cylinders through the arm 1 spool and arm 2 spool via
the parallel and confluence oil passage.  The oil from the rear pump flows into the travel motors
through the RH travel spool of the right control valve and the LH travel spool of the left control valve
via the straight travel spool.
The arm is operated and the machine travels straight.

8. COMBINED ARM AND TRAVEL OPERATION

3 - 31

When the bucket and travel functions are operated, simultaneously the bucket spool and travel
spools in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve, and the straight travel spool is pushed to the left by the oil pressure from pilot
pump.  The oil from the front pump flows into the bucket cylinder through the bucket spool via the
confluence oil passage.  The oil from the rear pump flows into the travel motors through the RH
travel spool of the right control valve and the LH travel spool of the left control valve via the straight
travel spool of the control valve.
The bucket is operated and the machine travels straight.

9. COMBINED BUCKET AND TRAVEL OPERATION

PG

XAtl

XBs

XAs

XAb2

XBa2

Px

Pz

Dr1

XAa1

XAa2

XBa1

XBtl

(XBp1)

R2

P2

PILOT
PUMP

TRAVEL(LH)

SWING

BOOM 2

ARM 1

ARM 2

BUCKET

BOOM 1

OPTION

TRAVEL(RH)

XAtr

XA0

Atr

XB0

XBtr

Ab1

Bb1

XAb

XBb

Dr4

PbL

XAb2

XBa2

XAa2

(XBp2)

Py

Fl

Fr

PBP

PaL

Dr3

Dr2

XAk

Ak1

Bk1

XBk

Px

P1

Btr

SWING MOTOR

TRAVEL MOTOR

HYDRAULIC TANK

FRONT

PUMP

REAR
PUMP

ARM

CYLINDER

BUCKET

CYLINDER

BOOM

CYLINDER

Pns

Dr6

R1

PH

SECTION  4  ELECTRICAL SYSTEM

Group   1  Component Location

4-1

Group   2  Electrical Circuit(up to -#1000)

4-3

Group   3  Electrical Component Specification

4-23

Group   4  Connectors

4-33

Group   5  Electrical circuit(#1001 and up, Tier II)

4-53

4 - 1

SECTION  4  ELECTRICAL SYSTEM

GROUP  1  COMPONENT LOCATION

1. LOCATION 1

1

Horn switch

2

Breaker operation switch

3

Cluster  

4

Cigar lighter

5

Hour meter

6

Safety lever

7

Power max switch

8

One touch decel switch

9

Air conditioner switch

10

Master switch

11

Fuse box

12

RS232 serial connector

13

CPU controller

14

Prolix resistor

15

Prolix switch

16

Cassette radio

17

Speaker

18

Main light switch

19

Wiper switch

20

Washer switch

21

Preheat switch

22

Travel alarm switch

23

Cab light switch

24

Breaker selection switch

25

Beacon switch

26

Accel dial

27

Start switch

28

Overload switch

29

Quick clamp switch

21074EL01A

2. LOCATION 2(up to #1000)

4 - 2

1

Lamp

2

Fuel sender

3

Fuel filler pump

4

Beacon lamp

5

Horn

6

Speed sensor

7

Pressure sender

8

Heater valve

9

Start relay

10

Heater relay

11

Temp sender

12

Engine oil pressure switch

13

Alternator

14

Air cleaner switch

15

Master switch

16

Battery

17

Travel alarm buzzer

18

Battery relay

21074EL02

4 - 2-1

2. LOCATION 2(#1001 and up, TIER II)

1

Lamp

2

Fuel sender

3

Fuel filler pump

4

Beacon lamp

5

Horn

6

Speed sensor

7

Heater valve

8

Start relay

9

Heater relay

10

Temp sender

11

Engine oil pressure switch

12

Alternator

13

Air cleaner switch

14

Battery

15

Travel alarm buzzer

16

Battery relay

17

Pressure sender

21074EL02A

4-

3

GROUP

2

  ELECTRICAL CIRCUIT (up to #1000)

21074EC01

¡⁄

Machine serial no : up to #0179

4-

3

-1

21074EC01A

¡⁄

Machine serial no : #0180~#1000

4 - 4

1. POWER CIRCUIT (up to #0179)

The negative terminal of battery is grounded to the machine chassis through master switch.
When the start switch is in the OFF position, the current flows from the positive battery terminal as shown
below.

OPERATING FLOW
Battery          Battery relay           Reset button[CS-61]

Fuse box [No.1]          I/conn [CN-8(12)]          Start switch [CS-2(1)]

Power relay [CR-35(30)]

Fuse box [No.2]          I/conn [CN-10(6)]          Room lamp [CL-1(2)]         Door switch[CS-1]

Cassette radio [CN-27(11)]

Fuse box [No.3]          I/conn [CN-11(4)]          AC&Heater controller [CN-116(3,4)]
Fuse box [No.4]          I/conn [CN - 5(4)]          I/conn [CN -17(5)]           Wiper motor Controller 

[CN-141(7)]
Wiper motor [CN-21(4)]

Fuse box [No.5]          CPU controller [CN-50(7)]
Fuse box [No.6]          I/conn [CN-11(5)]          Relay(Hi, M2)

Engine

Start switch

Check point

Voltage

1)

¡

GND : Ground

OFF

OFF

- GND (Battery 1 EA)

- GND (Battery 2 EA)

- GND (Battery 2 EA)

- GND (Reset button)

10~12.5V

20~25V

20~25V

20~25V

2) CHECK POINT

I/conn : Intermediate connector