SENR1213-02 January 1999

FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN

PUMP OR MOTOR

FLUID CONDITIONER

SPRING

CONTROL VALVES

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

LINE RESTRICTION (FIXED)

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

TWO POSITION

PUMP (VARIABLE & PRESSURE COMPENSATED)

LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)

ATTACHMENT

VALVE PORTS

THREE POSITION

TWO - WAY

THREE - WAY

CONTROL VALVES AB

AUX

PUMP (2 - SECTION)

VALVES

VALVE ENVELOPES

ONE POSITION

RESTRICTION

FOUR - WAY

CHECK VALVES

A B

P T

P T

NORMAL POSITION

SHIFTED POSITION

BASIC SYMBOL

INFINITE POSITION

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

416C, 426C & 436C Backhoe Loader Hydraulic and Steering Systems

PRESSURE

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

436C: 8TN1-UP 9JN1-UP 1FR1-UP 1GR1-UP 1PR1-UP 1RR1-UP 2AR1-UP 2BR1-UP

SOLENOID

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID & PILOT OR MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

MANUAL SHUTOFF

PUSH - PULL LEVER

GENERAL MANUAL

EXTERNAL RETURN

SPRING LOADED

INTERNAL RETURN

PEDAL

SIMPLIFIED

LINES CROSSING

COMPLETE

VARIABLE DISPLACEMENT NON-COMPENSATED

FIXED DISPLACEMENT

SINGLE ACTING

LINES JOINING

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLE ACTING

INTERNAL PASSAGEWAYS INFINITE POSITIONING

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

INTERNAL SUPPLY PRESSURE

HYDRAULIC & PNEUMATIC CYLINDERS

HYDRAULIC MOTORS

HYDRAULIC PUMPS

SPRING

REMOTE SUPPLY PRESSURE

CROSSING & JOINING LINES

GAS CHARGED

FIXED DISPLACEMENT

PUSH BUTTON

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

ACCUMULATORS

3 POSITION

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

2 POSITION

FLOW IN EITHER DIRECTION

Printed in U.S.A.

ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)

G

M

TRANSDUCER (FLUID)

TRANSDUCER (GAS / AIR)

GENERATOR

ELECTRIC MOTOR

PRESSURE SWITCH

PRESSURE SWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

ELECTRICAL SYMBOLS (ELECTRICAL)

T

PRESSURE SWITCH

TEMPERATURE SWITCH

LEVEL SWITCH

FLOW SWITCH

WIRE NUMBER IDENTIFICATION CODES

ELECTRICAL SCHEMATIC EXAMPLE

HYDRAULIC SCHEMATIC EXAMPLE

CURRENT STANDARD

CURRENT STANDARD

HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE CIRCUIT NUMBER IDENTIFICATION

325-AG135 PK-14

CIRCUIT NUMBER IDENTIFICATION

WIRE COLOR

WIRE COLOR

WIRE GAUGE

325-PK

PREVIOUS STANDARD WIRE

WIRE COLOR

B

325-PK-14

CIRCUIT NUMBER IDENTIFICATION

WIRE GAUGE

A

(EXAMPLE VALVE)

(Dimensions: 34 inches x 24 inches)

© 1999 Caterpillar, All Rights Reserved

RETURN BELOW FLUID LEVEL

ROTATING SHAFTS

16 Page,

426C: 6XN1-UP 7WN1-UP 1CR1-UP 1ER1-UP 1MR1-UP 1NR1-UP 1YR1-UP 1ZR1-UP

RETURN ABOVE FLUID LEVEL

MEASUREMENT

SENR1213-02

416C: 5YN1-UP 4ZN1-UP 1AR1-UP 1BR1-UP 1KR1-UP 1LR1-UP 1WR1-UP 1XR1-UP

PRESSURIZED

VENTED

31 30 1

4

2

5

7

6

3

8 L

R

T

Item No.

P

12

13

11

14

15

16

17

18

44 45

42

43

9

24

28

1

Front Steering Cylinder

23

2

2WS Steering Metering Pump

3

AWS Steering Metering Pump

4

AWS Brake Control Valve

9

27

22

26

21

10

20

5

Multipurpose Bucket Cylinder (Optional)

6

AWS Rear Axle Brakes

7

Loader Valve Group

17

8

8

Auxillary Control Valve (Optional)

9

Lines to Auxillary Cylinders (Optional)

10

Auxillary Control Valve (Optional)

11

Boom Cylinder

12

Swing Cylinders

19

44 35

7

37 38 27

36

48

25

47

23

24

20

21

22

19

46

34 28

30

4 18 3

13

Left Stabilizing Cylinder and Check Valve

14

Right Stabilizing Cylinder and Check Valve

15

Backhoe Bucket Cylinder

16

Extendible Stick Bucket Cylinder (Optional)

17

Stick Cylinder

18

Extendible Stick Cylinder (Optional)

19

Extendible Stick Control Valve (Optional)

20

Stick Control Valve

21

Bucket Control Valve

22

Right Stabilizer Control Valve

33

12

32 39

23

Left Stabilizer Control Valve

24

Swing Control Valve

25

Boom Control Valve

26

Tilt Control Valve

27

Lift Control Valve

28

AWS 3 Bank Valve (Optional)

29

AWS Inlet Manifold and Steering Priority Valve Group

30

2WS 3 Bank Valve (Optional)

38

6 45

36 43

46

6

41

37

Lift Cylinders

38

AWS Rear Steering Cylinder (Optional)

39

AWS Steering Valve and Mounting Group

40

Ride Control Accumulator (Optional)

41

Ride Control Solenoid Valve (Optional)

42

Tilt Cylinder

31

2WS Inlet Manifold and Steering Priority Valve Group

32

Piston Type Hydraulic Pump

33

Hydraulic Oil Tank

43

AWS Valve Assembly

34

Hydraulic Oil Cooler

44

AWS Brake Reservoir Tank Group

47

Orifice Diameter 1.5 mm (0.06 in) Orifice Diameter 0.4 mm (0.02 in) Orifice Diameter 1.2 mm (0.05 in)

35

AWS Oil Pressure Switch

45

Return Line Hydraulic Oil Filter

48

36

Ride Control Pressure Switch (Optional)

46

Check Valve

49

11

8

10 Hydraulic Schematic - Parallel Lift

3

(Dimensions: 34 inches x 24 inches)

16 Page,

SENR1213-02

Item No.

R

L

Parallel Lift 48 40

LS

T

P

14

15

13

'A'

49

46

16

17

18

19

20

44

45

42

11

12

43 39 41

38

Component

1

Front Steering Cylinder

2

2WS Steering Metering Pump

3

AWS Steering Metering Pump

4

Multipurpose Bucket Cylinders (Optional)

5

Broom Motor (Optional)

6

Pin Coupler Cylinder (Optional)

7

Coupler Valve and Mounting Group (Optional)

8

Manual Shut Off Valve (Optional)

9

Loader Valve Group

10

Auxillary Control Valve (Optional)

11

Lines to Auxillary Cylinders (Optional)

12

Auxillary Control Valve (Optional)

13

Boom Cylinder

14

Swing Cylinders

15

Left Stabilizer Cylinder and Check Valve

16

Right stabilizer Cylinder and Check Valve

17

Backhoe Bucket Cylinder

18

Extendible Stick Bucket Cylinder (Optional)

19

Stick Cylinder

20

Extendible Stick Cylinder (Optional)

21

Extendible Stick Control Valve (Optional)

22

Stick Control Valve

23

50 P LS T

35

36

28

31 34

32 A

33 B

P LS T

27

52

30 29

26

25

24

23

22

21

53

19 17

27

40

26

39

25

34

24

33

23

32

22

31

21

10

12

9

38

18

36 29 20

30 3 2

8

48

37

14

1

47

15

4 35

46 28

43

49

41

42

5

44

6

45

7 8

36

Hydraulic Oil Tank

37

Hydraulic Oil Cooler

38

AWS Oil Pressure Switch

39

Lift Control Valve

40

Tilt Control Valve

41

Ride control Pressure Switch

Bucket Control Valve

42

Lift Cylinders

24

Right Stabilizer Control Valve

43

AWS Rear Steering Cylinder (Optional)

25

Left Stabilizer Control Valve

44

Ride Control Solenoid Valve (Optional)

45

Ride Control Accumulator (Optional)

46

AWS Steering Valve and Mounting Group (Optional)

47

AWS Valve Assembly

48

Tilt Cylinders

49

Return Line Hydraulic Oil Filter

50

Orifice Diameter 1.5 mm (0.06 in)

26

Swing Control Valve

27

Boom Control Valve

28

AWS Rear Axle Brakes

29

AWS Brake Reservoir Tank Group

30

AWS Brake Control Valve

31

AWS 3 Bank Valve (Optional)

51

Orifice Diameter 0.4 mm (0.02 in)

32

AWS Inlet Manifold and Steering Priority Valve Group

52

Orifice Diameter 1.2 mm (0.05 in)

33

2WS 3 Bank Valve (Optional)

53

Check Valve

34

2WS Inlet Manifold and Steering Priority Valve Group

A

Fluid from AWS brake valve to AWS steering valve

35

Piston Type Hydraulic Pump

B

Signal from AWS brake reservoir to AWS steering valve

51

37

5

37

40

9

7

5

'B'

1

43

13

1

47

42

2

11

32

49

4

34

29

31

2

33

16 15

40

26

35

Component

10

41

39

29

Hydraulic Schematic - Single Tilt

Single Tilt LS

25