Loader Bobcat 853, 853H. Manual — part 13

C apacity . . . 15.5 Qts (14,7 L)

DISPLACEMENT CONTROL VALVE

Neutral . . . . 310-330 PSI

(2137-2275 kPa )

Stroked . . . . 3O0-320 PSI

(2069-2206 kPa)

CHARGE PUMP . . . . 11.0 GPM

225-290 PSI (1551-2000 kPa )

(41,6 L./M in .) at 2850 RPM

FLOW DIVIDER ADJUSTMENT VALVE

HYDRAULIC/HYDROSTATIC SCHEMATIC

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - FLOW CONTROL

SPOOL

LEGEND

RESERVOIR:

DIFFERENTIAL PRESSURE SWITCH:

SPRING LOADED FILTER BYPASS

ONE WAY RESTRICTOR VALVE

Printed in U.S.A.

DRIVE MOTOR SHUTTLE VALVE

RELIEF/REPLENISHING VALVE - HIGH

RELIEF VALVE - MAIN:

2550-2600 PSI (17582-17927 kPa)

RELIEF VALVE - PORT:

CHECK VALVE - BUCKET POSITION

VALVE

3500 PSI (24132 kPa)
LOAD CHECK VALVE

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - UNLOADING

SPOOL

SHUTTLE RELIEF VALVE:

36-44 PSI (248-303 kPa)

1

at Front Quick Couplers

853 (S/N 508415216-17999)

2

4

3

5

11

VALVE: 45-55 PSI (311-379 kPa)

6

7

15

14

16

13

10

25

20

21

22

23

18

17

RELIEF VALVE - CHARGE:

38

31

35

(Printed June 1999)

PRESSURE:

(S/N 510126792 AND ABOVE)

(S/N 510250692 AND ABOVE)

34 FILTER - HYDROSTATIC (CANISTER)

8

9 RELIEF VALVE - PORT: (OPTIONAL)

3100 PSI (21371 kPa)

2500 PSI (17238 kPa)

12 RELIEF/ANTICAVITATION VALVE -

PORT (TILT BASE END):

TOW VALVE

19

24

26 MUFFLER (If Equipped)

CHARGE PRESSURE SENSOR

27

28 FLUID TEMPERATURE SENSOR

29

30

33

36 FILTER - HYDRAULIC (CANISTER)
37

FILTER

FILTER

(S/N 512811001-15999)

39

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - FOR REAR

AUXILIARY - NORMALLY OPEN

("D2")

SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - FOR REAR

AUXILIARY - NORMALLY OPEN

("D1")

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - FOR REAR

AUXILIARY - NORMALLY CLOSED

("P1" and "F1")

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - FOR REAR

AUXILIARY - NORMALLY CLOSED

("P2" and "F2")

32 FILTER

853 BASE - Normally Closed

853 PLUS - Normally Closed

SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - AUXILIARY

(OPTIONAL)

18.0 GPM (68,1 L/min.)

HYDRAULIC PUMP

at 2750 RPM

140°F. (60°C.) Fluid at Full

RPM

SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - FRONT

AUXILIARY (OPTIONAL ON 853 BASE)

STANDARD . 4350 PSI (29990 kPa)

OPTIONAL . 5000 PSI (34475 kPa)

CHECK VALVE - FILTER

MC2397LU

FIXED CAPACITY DISPLACEMENT

BIDIRECTIONAL HYDROSTATIC

MOTOR

ANTICAVITATION VALVE

NOTE: Unless otherwise specified,

springs have NO significant

pressure value.

MC2397U (5-19-99)

WORKING CIRCUITS

PILOT PRESSURE

DRAIN CIRCUITS

COMPONENTS

RIGHT DRIVE MOTOR

BUCKET POSITION VALVE (OPTIONAL)

HYDRAULIC

CONTROL VALVE

FRONT AUXILIARY

OIL

COOLER

D

C

A

B

HYDROSTATIC

FILTER

HYDRAULIC

FILTER

HYDROSTATIC PUMPS

T1LT CYLINDER

(S/N 510126792 AND ABOVE)

(S/N 510250692 AND ABOVE)

LIFT CYLINDER

LEFT DRIVE MOTOR

2

AUXILIARY

SPOOL

TILT CYLINDER

SPOOL

LIFT CYLINDER SPOOL

12

INLET

INLET

OUTLET

OUTLET

1

34

3

26

24

2

3

36

4

37

17

18

17

18

38

38

19

19

20

20

21

21

23

22

25

9

10

10

14

14

13

39

16

5

6

7

11

11

15

DIVERTER VALVE (OPTIONAL)

REAR AUXILIARY

D1

D2

P1

P2

F1

F2

FEMALE

MALE

FEMALE

MALE

29

30

33

35

31

8

32

28

27

Printed in U.S.A.

2750 RPM at

C apacity . . . 15.5 Qts (14,7 L)

DISPLACEMENT CONTROL VALVE

Neutral . . . . 310-330 PSI

(2137-2275 kPa)

Stroked . . . . 3O0-320 PSI

(2069-2206 kPa)

CHARGE PUMP . . . . 11.0 GPM

HYDRAULIC PUMP

225-290 PSI (1551-2000 kPa)

(41,6 L./M

in.) at 2850 RPM

FLOW DIVIDER ADJUSTMENT VALVE

NOTE: Unless otherwise specified

springs have NO significant

pressure value.

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - FLOW CONTROL

SPOOL

FIXED CAPACITY DISPLACEMENT

BIDIRECTIONAL HYDROSTATIC

MOTOR

LEGEND

RESERVOIR:

DIFFERENTIAL PRESSURE SWITCH:

SPRING LOADED FILTER BYPASS

ONE WAY RESTRICTOR VALVE

Printed in U.S.A.

DRIVE MOTOR SHUTTLE VALVE

RELIEF/REPLENISHING VALVE - HIGH

RELIEF VALVE - MAIN:

3300 PSI (22750 kPa )

RELIEF VALVE - PORT:

CHECK VALVE - BUCKET POSITION

VALVE

3500 PSI (24132 kPa)

SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - REAR

AUXILIARY (OPTIONAL)

LOAD CHECK VALVE

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - UNLOADING

SPOOL

SHUTTLE RELIEF VALVE:

36-44 PSI (248-303 kPa)

1

at 18 GPM (68,1 L/ min.)

MC2398LU (5-19-99)

2

4

3

5

11

VALVE: 45-55 PSI (311-379 kPa )

6

7

15

14

16

13

10

25

20

21

22

23

18

17

RELIEF VALVE - CHARGE:

RESTRICTION

36

RELIEF VALVE - FRONT AUXILIARY

(OPTIONAL) . 2500 PSI (17235 kPa)

31 SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE (TWO COIL)

35

PRESSURE:

(S/N 512811001-15999 WITH APITECH AUXILIARY VALVE)

34 FILTER - HYDROSTATIC (CANISTER)

CONTROL VALVE POWER-BEYOND

OUTLET

8

9 RELIEF VALVE - PORT: (OPTIONAL)

3100 PSI (21371 kPa)

2500 PSI (17238 kPa)

12 RELIEF/ANTICAVITATION VALVE -

PORT (TILT BASE END) (OPTIONAL)

TOW VALVE

19

24

26 MUFFLER (I f Equipped)

CHARGE PRESSURE SENSOR

27

28 FLUID TEMPERATURE SENSOR

29 BYPASS VALVE - COLD OIL

85 PSI (596 kPa)
SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - FRONT

AUXILIARY (OPTIONAL ON 853 BASE)

30

32
33

FILTER

37 ANTICAVITATION VALVE

1150 PSI (7929 kPa)

38 HYDRAULIC PUMP

6.0 GPM (22,7 L/ min.)

2750 RPM at

1150 PSI (7929 kPa)

39 SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - FLOW

SELECTIVE VALVE

40 CHECK VALVE - FLOW SELECTIVE

VALVE

41 RELIEF VALVE

42 SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - RELIEF

SELECTIVE VALVE

43 RELIEF VALVE

2750-2850 PSI (18958-19648 kPa)

853 BASE - Normally Closed

853 PLUS - Normally Closed

18.0 GPM (68,1 L/ min.)

140°F. (60°C.) F luid at Full RPM

STANDARD . 4350 PSI (29990 kPa)

OPTIONAL . 5000 PSI (34475 kPa)

CHECK VALVE - FILTER

44 PILOT TO OPEN CHECK VALVE

45 FILTER

FILTER - HYDRAULIC (CANISTER)

3200-3400 PSI (22061-23439 kPa)

kPa)

MC2398U (5-19-99)

WORKING CIRCUITS

PILOT PRESSURE

DRAIN CIRCUITS

COMPONENTS

2

12

32

34

3

26

30

30

33

31

35

35

32

2

3

24

4

45

17

18

17

18

36

36

19

19

20

20

21

21

22

25

8

9

10

10

14

14

13

37

16

5

6

7

11

11

15

1

41

42

43

39

40

23

38

27

28

29

44

Printed in U.S.A.