EN CAT Backhoe Loader 446B Hydraulic Schematic Manual - PDF DOWNLOAD

SENR5824-01 January 1995

446B Backhoe Loader Hydraulic System 5BL1-UP

Printed in U.S.A.

SENR5824-01

© 1995 Caterpillar All Rights Reserved

5BL1-499

446B HYDRAULIC SCHEMATIC (5BL 1-499) Item No.

1

2

3

4

5 6

7

8 9

11

10

13

12

14

16

15

17

11

19

18 22

20

24

21 25

23

26

27

28

29

32

33

30

31

34

35

37

36

38

Component

1

Steering Cylinder

2

Lift Cylinders

3

Lift Control Valve

4

Brake Accumulator

5

Brake Accumulator Charging Valve

6

Backhoe Swing Cylinders

7

Steering Control Valve

8

Tilt Cylinder

9

Tilt Control Valve

10

Brake Control Valve

11

Brake Cylinder

12

31

12 13

15

18

Backhoe Stick Cylinder

20

17

22

13

Backhoe Stick Control Valve

35

21

26

14

Right Hand Stabilizer Cylinder

36

15

Backhoe Swing Control Valve

38

16

Brake Pressure Switch

17

Right Hand Stabilizer Control Valve

18

Supplemental Steering Accumulator

19

Backhoe Bucket Cylinder

20

Backhoe Bucket Control Valve

21

Left Hand Stabilizer Control Valve

22

Supplemental Steering Valve Group

23

Loader Auxiliary Control Valve

24

Hydraulic Tank Group

4

25

Left Hand Stabilizer Cylinder

5

26

Steering Oil Pressure Switch

27

Loader Inlet And Priority Valve

28

Hydraulic System Pressure Tap

29

Hydraulic Tank Relief Valve Group

30

Backhoe Boom Cylinder

31

Extendible Stick Cylinder

32

Hydraulic Pump Group

33

Hydraulic Pump Signal Pressure Tap

34

Hydraulic Oil Cooler Group

35

Backhoe Boom Control Valve

36

Extendible Stick Control Valve

37

Hydraulic Oil Filter Group

38

Backhoe Inlet Manifold

19

7

24 10

30

16

29 2

8

34

37

6 25

3

28

1

32

9

11

33

11

23 27

5BL500-UP 446B HYDRAULIC SCHEMATIC (5BL500-UP) 1

2

3

6

5

SENR5824-01

4

7

8

9 11

13

12

14

15

10

16 11

17

18 19 22

20

21

23 24

25

26 27

28

29

30

31

32 33

34 38

35 39

36

37

Item No.

Component

1

Steering Cylinder

2

Lift Cylinders

3

Lift Control Valve

4

Brake Accumulator

5

Brake Accumulator Charging Valve

6

Backhoe Auxiliary Control Valve

7

Steering Control Valve

8

Tilt Cylinder

9

Tilt Control Valve

10

Brake Control Valve

11

Brake Cylinder

12

Backhoe Stick Cylinder

13

Backhoe Stick Control Valve

14

Backhoe Swing Cylinders

15

Backhoe Swing Control Valve

16

Brake Pressure Switch

17

Supplemental Steering Accumulator

18

Loader Auxiliary Control Valve

19

Backhoe Bucket Cylinder

20

Backhoe Bucket Control Valve

21

Right Hand Stabilizer Control Valve

4

22

Supplemental Steering Valve Group

5

23

Hydraulic Tank Group

24

Right Hand Stabilizer Cylinder

25

Left Hand Stabilizer Control Valve

26

Steering Oil Pressure Switch

27

Loader Inlet And Priority Valve

28

Brake System Pressure Tap

29

Hydraulic System Pressure Tap

30

Backhoe Boom Cylinder

31

Left Hand Stabilizer Cylinder

32

Hydraulic Pump Group

33

Hydraulic Pump Signal Pressure Tap

34

Hydraulic Oil Cooler Group

35

Backhoe Boom Control Valve

36

Extendible Stick Cylinder

37

Extendible Stick Control Valve

38

Hydraulic Oil Filter Group

39

Backhoe Inlet Manifold

36

12

6

19

13 15 20 21

17

35 25 39 37

26

22 7 10

30

16

23 2

34

38

14 31

3 11

28

1

29

9 18 27

11

32 33

8