Loader Bobcat 853, 853H. Manual - part 44

FUEL TANK

Removal And Installation

Remove the cover (Item 1) [A] which is installed over the
drain plug.

Remove the drain plug (Item 1) [B].

Drain the fuel into a container.

Check the drain plug and replace if necessary.

Remove the engine/hydrostatic pump assembly from the
loader (Page 7–1).

Disconnect the fuel fill hose (Item 1) [C].

Disconnect the tank vent hose (Item 2) [C].

Remove the bolts (Item 1) [D] from the battery holddown
plate.

Remove the battery holddown plate from the loader.

A

P–01616

1

C

P–04855

1

2

D

P–04959

1

853, 853H Loader

–5–15–

Service Manual

B

P–01619

1

FUEL TANK (Cont’d)

Removal And Installation (Cont’d)

Remove the mounting plate (Item 1) [A] for the battery
holddown plate.

Lift the fuel tank and remove it from the loader frame [B].

Fuel Level Sender

Loosen the fuel level sender (Item 1) [B].

Remove the fuel level sender from the fuel tank [C].

Inlet Screen

The inlet screen (Item 1) [D] is located at fuel tank fill
neck.

Disconnect the fuel fill hose.

Remove the inlet screen (Item 1) [D].

Wash the screen in clean solvent.

Dry the screen and check for damage. Replace as
needed.

A

P–04960

1

C

P–07922

D

P–05007

1

–5–16–

853, 853H Loader

Service Manual

B

P–04961

1

C

11

4

C

21

6

MC2561 (5-25-99)

S/N 508411001-11010

(Printed June 1999)

MC2561

853 BOSS - WIRING SCHEMATIC

START

RUN

OFF

ACC

2

1

PUR/WHT

RNG

RNG

DBL/WHT

RNG

WHT

BLK

RED/WHT

IGNITION SWITCH

B

I

ST

SO

BLK

PUR/RED

C

20

4

BLK

TO OPTIONS

(FRONT WIPER)

LIGHT SWITCH

(IF EQUIPPED)

CAB HARNESS (BOSS) - 6576352

FLASHER

BR

N

BRN

BR

N

LEFT

FLASHER

LAMP

(IF

EQUIPPED)

BOSS DISPLAY

4

3

2

1

D

E

A

C

B

PUR/RED
PUR/WHT

RNG
BLK

RED
PUR/RED
PUR/WHT
BLK

DIAGNOSTIC PORT

C

11

5

C

20

1

DGN/WHT

DGN/WHT

C119

D

BL

LEFT

HEADLIGHT

(IF

EQUIPPED)

BLK

RED/WHT

PNK

RNG

RED

RED

RED

RED/WHT

ACCESSORY FUSE HOLDER

RED/WHT

B

R

N

LCD DISPLAY MONITOR

BLK

WHT

DBL/WHT

PNK

PUR/WHT

PUR/RED

RNG

RNG

BLK

RNG

BL

K

BL

K

R

N

G

R

N

G

PU

R

/R

E

D

PU

R

/W

H

T

W

H

T/

R

N

G

R

N

G

/W

H

T

R

N

G

/W

H

T

YEL

/R

ED

BL

K

BL

K

PU

R

/R

ED

YE

L/

LBL

BL

K

BL

K

PU

R

BL

K

YE

L/

LBL

BL

K

YEL

/BR

N

BL

K

YEL

/D

BL

D

BL

/YEL

AIR

FILTER

HR

C

A

B

STARTER RELAY

SHUTDOWN RELAY

WIRES CONNECT BY

LETTER ACROSS

CONNECTORS

A

B A

B

WHT/LGN

GLOW PLUG RELAY

M

S

B

STARTER

BATTERY

RED

RED

G

RED

S

ALTERNATOR

B

RED

RED

87

87A

30

86

85

BLK
DBL/WHT

PNK

BLK

85

87

87A

LBL/BLK

LBL/RNG

RED

BLK

RED

86

30

85

WHT

87

87A

C

10

7

SOME CONNECTOR

BODIES NOT SHOWN

FOR DRAWING CLARITY

BLK

RNG

h

BL

K

C121

R

N

G

GLOW

PLUGS

BOSS

FUEL SHUTOFF

SOLENOID

FUEL

LEVEL

ENGINE OIL

PRESSURE

ENGINE

COOLANT

LGN

C118

LGN/WHT

PUR

EXC

B

RED

YEL

/D

G

N

R

N

G

/D

BL

WHT/BLK

86

30

AUXILIARY

HOURMETER AND

HARNESS (IF EQUIPPED)

ENGINE RPM

(MAGNETIC PICKUP)

#

 H

2

* * *

 G

1

 C

3

  PIN NUMBER = 30 PIN CONNECTOR

*

 C

3

* * *

 C

2

 D

3

 C

1

#

# # # # #

 C

2

 A

2

 A

3

 B

1

 B

2

 B

3

* * * *

 F

3

 E

1

 B

2

 B

1

# # # #

 D

1

 C

1

 D

3

 D

2

#

 E

3

* * * * * * * *

 D

1

 D

2

 E

2

 E

3

 H

1

 H

3

 B

3

 A

1

#

PIN NUMBER = 18 PIN CONNECTOR

* * * * *

* *

 F

2

 G

2

 G

3

 J

1

 J

3

 J

2

 K

1

#

# #

 F

3

 E

2

 F

2

*

* * *

 F

1

 K

2

 A

3

 A

2

# #

#

 F

1

 E

1

 A

1

ENGINE HARNESS (BOSS) - 6579653

BACKUP

ALARM

A
B
C

BL

K

BL

K

PN

K

PN

K

B

LK

D

BL

/W

H

T

BLK

B

LK

DBL/WHT

RNG/DGN

PNK

RNG

LEFT

TAILLIGHT

RIGHT

TAILLIGHT

REAR LIGHT HARNESS - 6577648

LEFT

WORK

LIGHT

RIGHT

WORK

LIGHT

LGN/RED

RED

LGN/PNK

RNG

DGN/YEL

LGN/DBL

DETENT LIGHT

MODE LIGHT

AUXILIARY HYDRAULIC SWITCH

(IF EQUIPPED)

D
C

E
F
B
A

E

B
A

RED

C

D

F

RED

LG

N

/D

BL

D

G

N

/YE

L

R

N

G

LG

N

/P

N

K

B

LG

N

/R

ED

PU

R

/L

BL

BL

K

LBL

/W

H

T

R

E

D

RED

C

10

6

RETURN FILTER

PRESSURE

PRE-FILTER

PRESSURE

HYDRAULIC

OIL

PRESSURE

COOLANT

LEVEL

HYDRAULIC

OIL

TEMPERATURE

HYDRAULIC

CHARGE

PRESSURE

BLK

RED

RNG

RED/WHT

A
B

BL

K

R

N

G

BLK

BLK

DGN/RED

DGN/WHT

C110

C

41

4

C

41

5

C407

C408

YEL/LGN

BL

K

RNG

B

CONTROLS MODULE

FRONT AUXILIARY

ROD SOLENOID

FRONT AUXILIARY

BASE SOLENOID

CONTROLS HARNESS - 6579881

D

G

N

D

G

N

/L

G

N

R

N

G

R

N

G

LG

N

/D

BL

LG

N

/PN

K

LG

N

/R

ED

D

G

N

/Y

EL

LG

N

/PN

K

LG

N

/R

ED

LG

N

/D

BL

R

N

G

B
A

B
A

B
A

B
A

C

41

1

C

41

0

BLK

BLK

B
A

A

B

A

B

A

B

REAR AUXILIARY

ROD SOLENOID

REAR AUXILIARY

BASE SOLENOID

YEL/WHT

YEL

DGN/LGN

RNG

DGN/RED

DGN

D

G

N

/R

ED

YEL

/W

H

T

D

G

N

/W

H

T

Y

EL

/L

G

N

D

G

N

/R

ED

YEL

LBL

/R

ED

A

B

FOR FUTURE USE

C

41

3

LBL/RED

BLK

C

40

2

B

A

C

40

3

A

B

C

40

4

RNG

DGN

B
A

A
B

DGN/RED

DGN/LGN

CONTROLS HARNESS -

6576323

BL

K

D

BL

BR

N

RIGHT

HEADLIGHT

(IF

EQUIPPED)

RIGHT

FLASHER

LAMP

(IF

EQUIPPED)

C122

BL

K

BL

K

R

N

G

BL

K

LBL/BLK

*

 D

1

B

A

CONTROLS HARNESS -

6576297

RNG

YEL

RNG/DBL

FUSE

IGNITION FUSE HOLDER

C120

C

11

6

HORN

B2

B1

WARNING

HEADLIGHT

REAR WORK

TAIL

FUSE

FRONT AUX.

RIGHT HANDLE

(IF EQUIPPED)

DETENT

LEFT HANDLE

(IF EQUIPPED)

HORN

REAR AUX.

RED/WHT

RESISTOR

5 OHM

C

20

3

A

A B

B A

B A

A

C

G J

K

H

F

D

E

J

C K

G H F A D B E

F

D

E

A K J H G C

B

E D F

A K J H G C

B A D F E C

B A D F E C

RNG

C

10

5

TO OPTIONS

C

10

8

RED/WHT

TO OPTIONS

GRY = GREY

WHT = WHITE

PUR = PURPLE

TAN = TAN

BRN = BROWN

PNK = PINK

YEL = YELLOW

DGN = DARK GREEN

LGN = LIGHT GREEN

DBL = DARK BLUE

LBL = LIGHT BLUE

BLK = BLACK

RNG = ORANGE

RED = RED

C

11

4

MC2562 (5-25-99)

S/N 508411011-11353

(Printed June 1999)

MC2562

853 BOSS - WIRING SCHEMATIC

START

RUN

OFF

ACC

2

1

PUR/WHT

RNG

RNG

DBL/WHT

RNG

WHT

BLK

RED/WHT

IGNITION SWITCH

B

I

ST

SO

BLK

PUR/RED

RED/WHT

C

20

4

BLK

TO OPTIONS

(FRONT WIPER)

CAB HARNESS (BOSS) - 6702610

FLASHER

BR

N

BRN

BR

N

LEFT

FLASHER

LAMP

(IF

EQUIPPED)

BOSS DISPLAY

4

3

2

1

D

E

A

C

B

PUR/RED
PUR/WHT

RNG
BLK

RED
PUR/RED
PUR/WHT
BLK

DIAGNOSTIC PORT

C

20

1

C

21

6

DGN/WHT

DGN/WHT

C119

D

B

L

LEFT

HEADLIGHT

(IF

EQUIPPED)

BLK

RED/WHT

RNG

BR

N

LCD DISPLAY MONITOR

BLK

WHT

DBL/WHT

PNK

PUR/WHT

PUR/RED

RNG

RNG

BLK

RNG

BL

K

BL

K

R

N

G

R

N

G

PU

R

/R

ED

PU

R

/W

H

T

W

H

T/

R

N

G

R

N

G

/W

H

T

R

N

G

/W

H

T

YE

L/

R

E

D

BL

K

BL

K

P

U

R

/R

ED

YE

L/

LB

L

BL

K

BL

K

PU

R

BL

K

YE

L/

LB

L

BL

K

YE

L/

BR

N

BL

K

YE

L/

D

B

L

D

BL

/YE

L

HR

C

A

B

STARTER RELAY

SHUTDOWN RELAY

WIRES CONNECT BY

LETTER ACROSS

CONNECTORS

A

B A

B

WHT/LGN

GLOW PLUG RELAY

M

S

B

STARTER

BATTERY

RED

RED

G

RED

S

ALTERNATOR

B

RED

RED

87

87A

30

86

85

BLK
DBL/WHT

PNK

BLK

85

87

87A

LBL/BLK

LBL/RNG

RED

BLK

RED

86

30

85

WHT

WHT/LGN

87

87A

C

10

7

SOME CONNECTOR

BODIES NOT SHOWN

FOR DRAWING CLARITY

BLK

RNG

h

B

LK

C121

R

N

G

GLOW

PLUGS

BOSS

FUEL SHUTOFF

SOLENOID

FUEL

LEVEL

ENGINE OIL

PRESSURE

ENGINE

COOLANT

LGN

C118

LGN/WHT

PUR

EXC

RED

YEL

/D

G

N

R

N

G

/D

BL

WHT/BLK

86

30

AUXILIARY

HOURMETER AND

HARNESS (IF EQUIPPED)

ENGINE RPM

(MAGNETIC PICKUP)

#

 H

2

* * *

 G

1

 C

3

  PIN NUMBER = 30 PIN CONNECTOR

*

 C

3

* * *

 C

2

 D

3

 C

1

#

# # # # #

 C

2

 A

2

 A

3

 B

1

 B

2

 B

3

* * * *

 F

3

 E

1

 B

2

 B

1

# # # #

 D

1

 C

1

 D

3

 D

2

#

 E

3

* * * * * * * *

 D

1

 D

2

 E

2

 E

3

 H

1

 H

3

 B

3

 A

1

#

PIN NUMBER = 18 PIN CONNECTOR

* * * * *

* *

 F

2

 G

2

 G

3

 J

1

 J

3

 J

2

 K

1

#

# #

 F

3

 E

2

 F

2

*

*

* *

 F

1

 K

2

 A

3

 A

2

# #

#

 F

1

 E

1

 A

1

ENGINE HARNESS (BOSS) - 6702898

BACKUP

ALARM

A
B
C

B

LK

B

LK

PN

K

PN

K

BL

K

D

BL

/W

H

T

BLK

BL

K

DBL/WHT

RNG/DGN

PNK

RNG

LEFT

TAILLIGHT

RIGHT

TAILLIGHT

REAR LIGHT HARNESS - 6577648

LEFT

WORK

LIGHT

RIGHT

WORK

LIGHT

LGN/RED

RED

LGN/PNK

RNG

DGN/YEL

LGN/DBL

DETENT LIGHT

MODE LIGHT

AUXILIARY HYDRAULIC SWITCH

(IF EQUIPPED)

D
C

E
F
B
A

E

B
A

RED

C

D

F

RED

LG

N

/D

BL

D

G

N

/Y

EL

R

N

G

LG

N

/PN

K

LG

N

/R

ED

PU

R

/L

BL

BL

K

LBL

/W

H

T

R

ED

RED

C

10

6

HYDRAULIC

CHARGE

PRESSURE

BLK

RNG

RED/WHT

A
B

BL

K

R

N

G

BLK

BLK

DGN/RED

DGN/WHT

C110

C

41

4

C

41

5

C407

C408

BL

K

RNG

CONTROLS MODULE

FRONT AUXILIARY

ROD SOLENOID

FRONT AUXILIARY

BASE SOLENOID

CONTROLS HARNESS -

6702634

D

G

N

D

G

N

/L

G

N

R

N

G

R

N

G

LG

N

/D

BL

LG

N

/P

N

K

LG

N

/R

ED

D

G

N

/Y

EL

LG

N

/P

N

K

LG

N

/R

ED

LG

N

/D

BL

R

N

G

B
A

B
A

B
A

B
A

C

41

1

C

41

0

BLK

BLK

B
A

A

B

A

B

A

B

REAR AUXILIARY

ROD SOLENOID

REAR AUXILIARY

BASE SOLENOID

YEL/WHT

YEL

DGN/LGN

RNG

DGN/RED

DGN

D

G

N

/R

ED

YEL

/W

H

T

D

G

N

/W

H

T

YEL

/L

G

N

D

G

N

/R

ED

YEL

C

40

2

B

A

C

40

3

A

B

C

40

4

RNG

A
B

YEL

YEL/WHT

CONTROLS HARNESS -

6702633

BL

K

D

B

L

BR

N

RIGHT

HEADLIGHT

(IF

EQUIPPED)

RIGHT

FLASHER

LAMP

(IF

EQUIPPED)

C122

BL

K

BL

K

R

N

G

BL

K

LBL/BLK

*

 D

1

RED/WHT

DIODE

R

E

D

/W

H

T

AC

C

ES

SO

R

Y 

FU

SE

R

ED

/W

H

T

EN

G

IN

E 

FU

SE

RED/WHT

RNG/DBL

C

40

1

A
B

YEL

YEL/WHT

DIODE

DIODE

DIODE

DIODE

DIODE

DIODE

DIODE

DIODE

C

11

6

C

11

5

RETURN FILTER

PRESSURE

HYDRAULIC

OIL

PRESSURE

PRE-FILTER

PRESSURE

HYDRAULIC

OIL

TEMPERATURE

COOLANT

LEVEL

AIR

FILTER

C120

LEFT HANDLE

(IF EQUIPPED)

HORN

REAR AUX.

LIGHT SWITCH

(IF EQUIPPED)

B1

B2

WARNING

HEADLIGHT

REAR WORK

TAIL

RED/WHT

PNK

HORN

A
B

RNG

DGN

B
A

A
B

DGN/RED

DGN/LGN

CONTROLS HARNESS -

6576323

RIGHT HANDLE

(IF EQUIPPED)

DETENT

FRONT AUX.

RESISTOR

5 OHM

C

20

3

B

A

A B

B A

B A

B

E D F

A K J H G C

B

E D F

A K J H G C

B A D F E C

B A D F E C

B

C A

G J F K D H E

C

G

F

D

E

K J

H

A

B

RNG

C

10

5

TO OPTIONS

TO OPTIONS

RED/WHT

C

10

8

RED/WHT

GRY = GREY

WHT = WHITE

PUR = PURPLE

TAN = TAN

BRN = BROWN

PNK = PINK

YEL = YELLOW

DGN = DARK GREEN

LGN = LIGHT GREEN

DBL = DARK BLUE

LBL = LIGHT BLUE

BLK = BLACK

RNG = ORANGE

RED = RED