420 D.pdf

FLUID POWER SYMBOLS

RENR3569-04 July 2005

DESCRIPTION It em No .

Rear Steering Cylinder(IfEquipped)

2 3

A l l Wh ee l S e t er i ngV a l ve( I fE q ui p pe d) SteeringCylinderAllWheelDrive(If Equipped)

4

Se t er n i gC yl in de r

5

Multipur i purpos p ose Bucket k et Cylinder(If Equipped)

6

B r oo mM o o t r( I fE q ui p pe d )

7

T li tC yl n i de r Inl et Cov er A ux i il a yr R eile fV al v e LineRelief Valve for Head End of Tilt Cylinder

16 17

S t ee rni gP roi rtiy V avl e T w oB an k Va l ve f or L oa de r

18

T h er e Ba nk V al v ef o rL oa de r

19

L oa de rL i tf Co nt r ol V a vl e L oa de rT i tl Co nt r ol V a vl e

21

L fi t C yl in de r L oa de r

22 23

R i de C on t or l S ol e no i dV avl e P re ss ur eS wi c t h

24

R i de Co nt r ol A c cu mu l at or

25

S t ee rni gM e e t ri n gP u mp

26

A l l Wh ee l S e t er P r es s ur e S wi t ch

27

BackPressure Check Valve Retu R ( eturn Oil)

28

H yd ra ul ic O li F il te r

29 30

H yd ra ul ic O i l Co ol er H yd a r ul ci T an k

31

Pi ston Pum p

32

O ir if ce C on ne ct or

33

Pilot Valve (Hydraulic Hand Controlfor the Loader)

34

O ir if ce C on ne ct or

35

R et ur nM an fi ol d

36 37

Solenoid Valve (Pilot Shutoff) o ff) for Hydraulic Lock Control ol Stabilizer ControlValve(TwoBank)

38

P r es s ur eR ed u ci n gV avl e

39

P iol t Tw o Ba nk C on t or l V al v e

40

P li otO i l Ac cu mu a l o t r

41

S t ab iilz er C o nt r ol V a vl e Sa t bi li ze rC yl in de r Sa t bi li ze rC yl in de r S t ab iilz er C o nt r ol V a vl e

45

S hu t e l V al ve

46

Inl et Cov er

47

F l ow C o nt r ol V a vl e ( I f Eq upi pe d)

48

B oo mC yl n i de r

49 50

LineRelief Valve for RodEnd of Boom Cylinder Line Relief Valve for Rod End on Swing Cylinder

51

S wi ng C yl n i de r

52

S wi ng C yl n i de r

53

Crossover ReliefValve (If Equipped)

54

Line Relief Valve for Head End of Bucket Cylinder

55

Backhoe h oeBucket e tCylinder(HighRotation)ExtendableStick

56 57

Backhoe h oe Bucket Cylinder(High Rotatio a tion) S it ck C yl n i de r

58

Line Relief Valve for Head End of Stick Cylinder

59

Extendable StickCylinder(If Equipped) Line Relief (If Equipped) for the Rod End of the Extendable Stick Cylinder (If Equipped)

61

ExtendableStick/AuxiliaryControlValve(IfEquipped)

62

Val ve Cov er Check Valve (If Equipped) for the Rod End of the

FOUR-WAY

THREE-WAY

BASIC SYMBOL

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

ROTATINGSHAFTS

FLOW

TEMPERATURE

UNIDIRECTIONAL

BIDIRECTIONAL

FLUIDSTORAGERESERVOIRS

420D, 430D, 432D, and 442D Backhoe Hydraulic System Volume 1: Parallel 420D: BKC1-919 BMC1-1059 BLN1-UP

Lift, Side Shift 430D: BNK1-UP BML1-UP

V E N E T D

442D: BRG1-UP BRY1-UP

RETURNBELOWFLUIDLEVEL

COMBINATIONCONTROLS

SOLE NOID

432D: BLD1-UP

RETURNABOVEFLUIDLEVEL

P R E S S U R ZI E D

SOLENOID or MANUAL

SOLENOID and PILOT

SERVO

SOLENOIDand PILOT or MANUAL

THERMA L

DETE NT

MANUALCONTROLSYMBOLS

PUSH-PULL LEV ER

MANUALSHUTOFF

GE NERAL MA MANUAL

PUSH B UTTO N

PEDAL

SP RING

PILOTCONTROLSYMBOLS RELEASEDPRESSURE

Volume 2: Single Tilt, Center Pivot 420D: 430D: BKC1-919 BNK1-UP BMC1-1059 BML1-UP BLN1-UP FDP1-UP

EXTERNALRETURN

REMOTESUPPLY PRESSURE

INTERNALRETURN

SIMPLIFIED

CROSSINGANDJOININGLINES

ACCUMULATORS

SPRING LOADED

GASCHARGED

LIN ESCR O SS I NG

FIXED DISPLACEMENT

FIXED DISPLACEMENT

SINGLEACTING

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLEACTING

INTERNALPASSAGEWAYS

VARIABLEDISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

INTERNAL SUPPLYPRESSURE

COMPLETE

HYDRAULICANDPNEUMATICCYLINDERS

LIN ESJO I NNI G

HYDRAULICMOTORS


INFINITE POSITIONING

CROSS FLOW

PARALLEL FLOW

FLOWINONE DIRECTION

TWO POSITION

THREE POSITION

©2005 Caterpillar AllRights Reserved

57

25

32 3 3 3 4

Printed in U.S.A.

30

Electrical Symbols Table

55 56

Hydraulic Symbols (Electrical)

Extendable Stick Cylinder (If Equipped)

Check Valve (If Equipped) for the Rod End of the StickCylinder

68

B ac k ho e Bu c ke t C on t or l V al v e

69

Line Relief Valve for Rod End of Bucket Cylinder

70

Backhoe h oe ControlValve (Four Bank Valve) (If Equipped)

71

Backhoe h oe ControlValve (Five Bank Valve) (If Equipped)

72 73

Backhoe h oe ControlValve (Six Bank Valve) (If Equipped) S wi ng Co nt ro l Va vl e

74

B oo mC on rt ol V al ve

M

G


LineRelief Valve for Head End of Boom Cylinder

11

29 Transducer (Fluid)

Transducer (Gas / Air)

Generator

Electric Motor

59 Pressure Switch (Adjustable)

Pressure Switch

ElectricalWire

Temperature Switch

Check Valve (If Equipped) for the Rod End of the Boom Cylinder

ElectricalSymbols(Electrical)

LineRelief Valve for RodEnd of Stick Cylinder

77


78 79

Pilot ValvefortheBackhoeJoystick Selector Valve (Joyst o ystick i ck Pattern t ern) (If Equipped)

80

Pilot ValvefortheBackhoeJoystick

T

Pressure Symbol

Temperature Symbol

Flow Symbol

Level Symbol

48 Wire Number Identification Codes 39

Electrical Schematic Example

AA

50 49 47 46 45

Wire Circuit Number Identification

Description PUMPPRESSURE TEST PORT

BB

P U MP S I G NA L P R ES S U RE T E S TP O RT

CC

P IL OT P RE SS U RE T ES T P OR T

DD

Harness identification code This example indicates wire 135 in harness "AG".

U S E D WI T H P AR A LL E LL I FT L O AD E R

EE

U S ED W T I H A LL WH EE LS TE E R

FF

U S ED W T I H NO N- AL LW HE E LS TE E R

GG

U S ED W T I H A LL W HE EL S TE E R

HH

N O TU S ED W I T H AL L W H EE L S T EE R

JJ

WR I E D TO TH E C ON TR OL LE R

61 60 58 54 53 66 65 64 63 62 71 70 69 68 67 76 75 74 73 72

Wire Color

325-AG135 PK-14 325-PK

43 42

40

37 38

79

22 23 24

80 78

41 44

21 27

3

4

5

6

8

9

10

Circuit Identification Number

W ri eC ol or

Wire Color

Wire

36 35 26

1

2

7

12

W ri eG au g e

Previous Standard

31 28

77 51 52

Hydraulic Schematic Example Current Standard

Current Standard Tap Locations Pressure, Sampling, and Sensor Tap Number

FLOWALLOWE DIN EITHERDIRECTIO N

Volume 1

Head End Relief Valve (If Equipped) for the

67

76

PRESSURE

S it ck Co nt ro l Va vl e

66

75

TWO-WAY

I N FN I I T E P O STI I O N

HYDRAULICPUMPS

42 43 44

ATTACHMENT

CHECKVALVES

PT SHIFE T D P O S I TO IN

MEASUREMENT

20

65

THR EEPOS I TO I N

LINERESTRICTION VARIABLEand PRESSURE COMPENSATED

VALVE PORTS

AB

PT NORMAL POSITION

LineRelief Valve for RodEnd of Tilt Cylinder

15

64

HYDR A U LCI PNEU MATIC ENERGYTRI ANGLES

VALVES

CONTROLVALVES

13

MAINAUX. PUMP: VARIABLEand 2-SECTIONPUMP PRESSURECOMPENSAT ED

LINERESTRICTION (FIXED)

RESTRICTION

PRESSURE COMPENSATION

LINERESTRICTION (VARIABLE)

T W OP O SI TO I N

ONEPOSITION

AB

14

63

CO NTR O LV A LVS E

VALVE ENVELOPES

A ux il ia yrC o nt ro l Va vl e Coup el rV al ve D vi er et r Va vl e

11

60

SPRING (ADJUSTABLE)

VARIABILITY

C ou pl er C yl n i de r

9 10 12

SP RIN G

FLUIDCONDITIONER

Co m p o nen t

1

8

BASICCOMPONENTSYMBOLS

PUMPorMOTOR

325-PK-14

13 14 1 5 1 6 17 18 19 20

B Circuit Number Identification

A

Wire Gauge (EXAMPLEVALVE )

1 L O V 4 e 0 - g a 9 P 0 6 2 5 3 R N E R

43 44 42 7 1

39

6

2

3

4

41

13

5 8

40 14 9 A

C

B

CC

D

10 35

GG HH 12 11 15

36

DD 27

22

EE

21 25

37 38

FF

20

24

51

28 26

45

53

52

5556

46

57 48

19

60

59

49

61

62

75

47

50

58

54

23

16 17 18

29

1 L O V 2 4 l r o o 0 - C , 9 e g 6 P a 5 0 3 2 R N E R

30

31

32

BB

34 77

73

74

76

72 7 1 7 0

69

67

68

66

65

64

63

LINES

GROUP

COLOR

DESCRIPTIONS

MAIN PUMP OUTPUT TILT CYLINDER CIRCUIT

JJ

STABILIZER CIRCUIT (LEFT AND RIGHT) LIFT CYLINDER CIRCUIT

80 AA

E

F

G

STICK CYLINDER CIRCUIT BOOM CYLINDER CIRCUIT SWING CYLINDER CIRCUIT

H

SUPPLY LINE DRAIN / RETURN LINE STEERING CIRCUIT LOAD SENSING (RESOLVER CIRCUIT) BUCKET CYLINDER (MULTIPURPOSE) - (IF EQUIPPED) COUPLER CYLINDER CIRCUIT EXTENDABLE STICK CYLINDER CIRCUIT (IF EQUIPPED)

33

AUX CON TROL VA LVE (EX TENDABL E STICK ) - (IFEQUIPPE D)

78

BUCKET CYLINDER CIRCUIT (BACKHOE) (HIGH ROTATION)

E

F

G

H

79

J

K

L

M LINE PATTERNS

Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines ComponentGroup Attachment Air Line

RearSteeringCylinder(IfEquipped)

2 3

A l l Wh ee l S e t e r Va l ve ( fI E q uip pe d) SteeringCylinderAllWheelDrive(If Equipped)

4

Se t er n i gC yl in de r

5

Multipurp oseBucket Cylinder (If Equipped)

6

A ux li ia yr R el ie f Va vl e

7

A ux li ia yr C o nt ro l Va vl e

8

LineRelief Valve o f r Rod End ofTilt Cylinder

9 10

LineRelief Valve for Head Endof Tilt Cylinder T li tC ylni de r

11

L oa d er Ti l tC on t or l V al v e

12

Pressure Reducing Valve o f r theTilt ControlValve

13

L i tf C yiln de rL oa de r

14

L oa d er Li f tC on t or l V al v e

15 16

R i de C on rt o l So l en odi V al v e R i de Co nrt o l Ac c um ual t or

17

S t ee rni gM eet rni gP u mp

18

BackPressureCheck Valve Retu ( rn Oil)

19

H yd a r ul ci O il F itl er

20

H yd a r ul ci O i l Co ol er

21

H yd ar ulci T an k

22 23

P si o t n Pum p P re ss ur eS wi tc h S t ee rni gP roi rti yV avl e T w oB a nk V alv ef o rL oa de r

26

T h er e Ba nk V al v ef o rL oa d er

27

P iol t Tw o Ba n kC on t or l V al v e

28

R et ur nM an fi ol d

29 30

P li otO i l Ac cu mu a l o t r Solenoid Valve (Pilot Shutoff) for Hydraulic Lock Contr ol

31

P r es s ur e Re du cni g va l ve

32

Stabilizer ControlValve(TwoBank)

33

S t ab iilz er C on t or l V al v e

34

Sa t bi il ze rC yl in de r

35

Sa t bi il ze rC yl in de r

36 37

S t ab iilz er C on t or l V al v e S hu t el Va vl e

38

I nl et Cov er

39

F l ow C o nt ro l V al v e (I f E q uip pe d )

40

B oo mC yl n i de r

41

LineRelief Valve for RodEnd of Boom Cylinder

42 43

Line Relief Valvefor Rod End on Swing Cylinder S wi ng C yl ni de r

44

S wi ng C yl ni de r

45

Cross over ReliefValve (If Equipped)

46

Line Relief Valvefor Head End of Bucket Cylinder

47

BackhoeBucketCylinder(HighRotation)ExtendableStick

48

Backhoe Bucket Cylinder(High Rota tion)

49 50

S it ck C yln i de r Line Relief Valvefor Head End of Stick Cylinder

51


54

V al ve Cov er

LINERESTRICTION (VARIABLE)

T W OP O SI TO I N

ONEPOSITION

PT SHIFE T D P O S I TO IN

I N FN I I T E P O STI I O N

BASIC SYMBOL

SPRING LOADED

MEASUREMENT

63

Backhoe ControlValve (Five Bank Valve) (If Equipped)

64

Backhoe ControlValve (Six Bank Valve) (If Equipped)

65 66

S wi ng C on rt ol V al ve B oo mC on rt ol V al ve

420D and 430D Backhoe Hydraulic System Volume 1: Parallel 420D: BKC1-919 BMC1-1059 BLN1-UP

FLOW

PILOT CONTROLLED

UNIDIRECTIONAL

BIDIRECTIONAL

Lift, Side Shift 430D: BNK1-UP BML1-UP

V E N E T D

RETURNBELOWFLUIDLEVEL

COMBINATIONCONTROLS

SOLE NOID

432D: BLD1-UP

RETURNABOVEFLUIDLEVEL

P R E S S U R ZI E D

442D: BRG1-UP BRY1-UP

SOLENOID or MANUAL

SOLENOID and PILOT

SERVO

SOLENOIDand PILOT or MANUAL

Volume 2: Single Tilt, Center Pivot 420D: 430D: BKC1-919 BNK1-UP BMC1-1059 BML1-UP BLN1-UP FDP1-UP

THERMA L

DETE NT

MANUALCONTROLSYMBOLS

PUSH-PULL LEV ER

MANUALSHUTOFF

GE NERAL MANUAL

PUSH B UTTO N

PEDAL

SP RING

PILOTCONTROLSYMBOLS RELEASEDPRESSURE

EXTERNALRETURN

REMOTESUPPLY PRESSURE

INTERNALRETURN

SIMPLIFIED

CROSSINGANDJOININGLINES

ACCUMULATORS

SPRING LOADED

GASCHARGED

LIN ESCR O SS I NG

HYDRAULICPUMPS FIXED DISPLACEMENT

SINGLEACTING

FIXED DISPLACEMENT


UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLEACTING

INTERNALPASSAGEWAYS

HYDRAULICMOTORS


INTERNAL SUPPLYPRESSURE

COMPLETE

HYDRAULICANDPNEUMATICCYLINDERS

LIN E S J OINNI G

INFINITE POSITIONING

CROSS FLOW

PARALLEL FLOW

FLOWINONE DIRECTION

TWO POSITION

THREE POSITION

FLOWALLOWE DIN EITHERDIRECTIO N

Volume 2 ©2005 Caterpillar AllRights Reserved

Printed in U.S.A.

Electrical Symbols Table Hydraulic Symbols (Electrical)

49

4748

17

Boom Cylinder Line Relief Valvefor Head End of Boom Cylinder

69


70

PilotValve or f BackhoeJoystick

71 72

Selector Valve (Joystick Patte rn) (If Equipped) PilotValve or f BackhoeJoystick

M

G

Check Valve (If Equipped) for the Rod End of the

68

Transducer (Fluid)

21

Transducer (Gas / Air)

Generator

Electric Motor

10 Pressure Switch (Adjustable)

Pressure Switch

51

20

PILOT CONTROLS

ElectricalWire

Temperature Switch

ElectricalSymbols(Electrical)

DESCRIPTION STABILIZERDOWNPOSITION S TA BI LI ZE R UP P OS IT O I N

C

S TA BI LI ZE R DO WN P OS IT O I N

D E

S TA BI LI ZE R UP P OS IT O I N B A CK H OE B O OM D OW N P OS I TI ON

F

B AC KH OE B OO M U P PO SI TI ON

G

B A CK H OE B O OM S W N I G LE F T PO SI T O I N

H

B A CK H OE B O OM S W N I G RG I HT P O SI T O I N

T

Pressure Symbol

Temperature Symbol

B A CK H OE B U CK E TC L OS E P OS I TI ON B A CK H OE S T I CK O U TP O SIT O I N B AC KH OE S TI CK I N PO SI TI ON

Flow Symbol

Level Symbol

Wire Number Identification Codes

B A CK H OE B U CK E TD U MP P O SI T O I N

K L M

Electrical Schematic Example

Hydraulic Schematic Example Current Standard

Current Standard Harness identification code This example indicates wire 135 in harness "AG".

40

Wire Circuit Number Identification

Tap Locations Pressure, Sampling, and Sensor

AA

SHUTTLE

ROTATINGSHAFTS

TEMPERATURE

StickCylinder

Backhoe ControlValve (Four Bank Valve ) (If Equipped)

Tap Number

FOUR-WAY

THREE-WAY

CHECKVALVES

AB

PT NORMAL POSITION

Check Valve (If Equipped) for the Rod End of the

62

J

TWO-WAY

CONTROLVALVES AB


Line Relief Valvefor Rod End of Bucket Cylinder

B

ATTACHMENT

Head End Relief Valve (If Equipped) for the

61

A

THR EEPOS I TO I N

LINERESTRICTION VARIABLEand PRESSURE COMPENSATED

VALVE PORTS

Check Valve (If Equipped) for the Rod End of the Extendable Stick Cylinder (If Equipped)

LineRelief Valve for RodEnd of Stick Cylinder B a ck h oe B u ck e t Co nrt o l Va l ve

ITEM

HYDR A U LCI PNEU MATIC ENERGYTRI ANGLES

VALVES

VALVE ENVELOPES

MAINAUX. PUMP: VARIABLEand 2-SECTIONPUMP PRESSURECOMPENSAT ED

LINERESTRICTION (FIXED)

RESTRICTION

PRESSURE COMPENSATION

S it ck Co nt ro l Va vl e

59 60

67

C ON T R O LV AL V S E

Extendable Stick Cylinder (If Equipped) ExtendableStick/AuxiliaryControlValve(IfEquipped)

58

SPRING (ADJUSTABLE)

VARIABILITY

Line Relief (If Equipped) for the Rod End of the

53

57

S PR I N G

FLUIDCONDITIONER

FLUIDSTORAGERESERVOIRS

24

56

PUMPorMOTOR

PRESSURE

25

55

BASICCOMPONENTSYMBOLS

Component

1

52

FLUID POWER SYMBOLS

RENR3569-04 July 2005

Description Item No.

Description PUMPPRESSURETEST PORT

BB

P U MP S I GN AL P RE S SU RE T E ST P OR T

CC

P I LO TP R ES S UR E T ES T P O RT

DD

U S ED W I TH A L LW HE E LS T EE R

EE

U S ED W I TH N O N- A LL WH E EL S TE E R

FF

U SE D WI TH A LL W HE EL S T EE R

GG

N OT U SE D W T I H A LL W HE E LS T EE R

Wire Color

325-AG135 PK-14

3 7 3 8 3 9 41 42

325-PK Circuit Identification Number

44 43

45 4 6 5 0 5 2 5 3

71

54 55 5 6 5 7 58 59 60 61 62 63

27

29

W ri eG au g e

Previous Standard Wire Color

Wire

19 22

12 13 18

3336

64 65 6 6 6 7 68 69

15 16 23

7072

3132

35 34

W ri eC ol or

3

4

5 325-PK-14

30 28

1

2

6

7 8

9 11

13 2 4 2 5 2 6

B Circuit Number Identification

A

Wire Gauge (EXAMPLEVALVE )

2 L O V 4 e 0 - g a 9 P 0 6 2 5 3 R N E R

35 33 5 3

2

1

36

34

27

6

29

4

7

CC

A

8

B

D

C

10

FF

28

GG

9 11 13

30

15 17

18

EE

12

DD

16

32 31

43 37

45

44

4748

38

49

19

40 14

52

51

41

53

54

42

39

46

67

50

23

2 L O V 2 4 l r o o 0 - C , 9 e 6 g a 5 P 2 3 0 R N E R

24 25 26

22

69 20

21

65

66

68

64 63 62

61

59

60

58

57

56

55

BB

72

AA 70

E

G

F

H

71

J

K

L

M

LINE PATTERNS

Pressure Line LINES

GROUP

COLOR

Pilot / Load Sensing Pressure

DESCRIPTIONS

MAIN PUMP OUTPUT TILT CYLINDER CIRCUIT

Drain / Return Lines

STABILIZER CIRCUIT (LEFT AND RIGHT)

ComponentGroup

LIFT CYLINDER CIRCUIT STICK CYLINDER CIRCUIT BOOM CYLINDER CIRCUIT SWING CYLINDER CIRCUIT

Attachment

SUPPLY LINE

Air Line

DRAIN / RETURN LINE STEERING CIRCUIT LOAD SENSING (RESOLVER CIRCUIT) BUCKET CYLINDER (MULTIPURPOSE) - (IF EQUIPPED) EXTENDABLE STICK CYLINDER CIRCUIT (IF EQUIPPED) AUX CON TROL VA LVE (EX TENDABL E STICK ) - (I F EQUIP PED) BUCKET CYLINDER CIRCUIT (BACKHOE) (HIGH ROTATION)

CALLOUTS YY

Taps (Pressure,Sampling,Sensor)byletter

THIS SCHEMATIC IS FOR THE 420D and 430D BACKHOE LOADER.

52

Componentsbynumber

Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.

420 D.pdf

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