Loader Bobcat 853, 853H. Manual — part 12

18.0 GPM (68,1 L/min.)

at 2750 RPM

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.

HYDRAULIC/HYDROSTATIC SCHEMATIC

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:

2550-2600 PSI (17582-17927 kPa)

RELIEF VALVE - PORT:

CHECK VALVE - BUCKET POSITION

VALVE

3500 PSI (24132 kPa)

SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE - AUXILIARY

(OPTIONAL)

LOAD CHECK VALVE

PILOT ACTIVATED DIRECTIONAL

CONTROL VALVE - UNLOADING

SPOOL

SHUTTLE RELIEF VALVE:

36-44 PSI (248-303 kPa)

853 PLUS - Normally Closed

853 BASE - Normally Closed

1

at Front Quick Couplers

853 (S/N 508411001-15215)

MC2396LU (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

37

RELIEF VALVE - FRONT AUXILIARY

2400-2600 PSI (16548-17927 kPa)

31 SOLENOID ACTIVATED DIRECTIONAL

CONTROL VALVE (TWO COIL)

35

(Printed June 1999)

PRESSURE:

(S/N 510125001-26791)

(S/N 510250001-50691)

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 (If 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

36 FILTER - HYDRAULIC (CANISTER)

40

FILTER

FILTER

FILTER

38 ANTICAVITATION VALVE

CHECK VALVE - FILTER

140°F. (60°C.) Fluid at Full RPM

STANDARD . 4350 PSI (29990 kPa)

OPTIONAL . 5000 PSI (34475 kPa )

39 PILOT TO OPEN CHECK VALVE

MC2396LU

MC2396U (5-19-99)

WORKING CIRCUITS

PILOT PRESSURE

DRAIN CIRCUITS

COMPONENTS

FRONT AUXILIARY VALVE (OPTIONAL)

(APITECH)

RIGHT DRIVE MOTOR

BUCKET POSITION VALVE (OPTIONAL)

HYDRAULIC

CONTROL VALVE

FRONT AUXILIARY (OPTIONAL)

OIL

COOLER

D

C

A

B

HYDROSTATIC

FILTER

HYDRAULIC

FILTER

HYDROSTATIC PUMPS

T1LT CYLINDER

LIFT CYLINDER

MALE

FEMALE

PORT

BLOCK

LEFT DRIVE MOTOR

SECONDARY FRONT AUXILIARY (OPTIONAL)

MALE

FEMALE

MALE

FEMALE

REAR AUXILIARY (OPTIONAL)

LOCK VALVE (OPTIONAL)

2

AUXILIARY

SPOOL

TILT CYLINDER

SPOOL

LIFT CYLINDER SPOOL

12

INLET

INLET

OUTLET

OUTLET

32

1

34

3

26

30

30

33

31

35

35

24

2

3

36

4

40

17

18

17

18

37

37

19

19

20

20

21

21

23

22

25

8

9

10

10

14

14

13

38

16

5

6

7

11

11

15

29

27

28

39

Printed in U.S.A.