Bobcat 743 - Page 40

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Removing Hydraulic

Oil

Remove

the

oil

from

the

hydraulic

reservoir and replace

it

with

new

oil

every

1,000

hours

of

operation.

Also

replace

the

oil

after

it

has

become

dirty

and

after

any

major

repairs.

1.

Remove

the

hydraulic

filter

element. Remove

the

hose

from

the

filter

housing.

Let

the

oil

flow

into

a

container.

2.

Connect

the

hose

to

the

filter

housing

when

the

reservoir

is

empty.

Install

a

new

filter

element.

3.

Remove

the

snap ring and

remove

the

screen

from

the

fill pipe (Fig.

67).

Wash

the

screen in clean

solvent

and

install

it

in

the

fill pipe.

4.

Open

the

top

check

valve

(Fig.

66,

Item

2).

Remove

the

fill

cap

from

the

reservoir

(Fig.

66,

Item

3).

Add

oil

to

the

reservoir

until

the

oil

flows

at

the

top

check

valve

(approximately

3.5

gallons

[13L)).

Refer

to

"Specifications",

page

62

for

type

of

oil

to

use. Close

the

check

valve

and

replace

the

fill cap. DO

NOT

fill

above

the

top

check

plug

level.

Operate

the

loader

hydraulic

controls

through

all

the

hydraulic

functions.

Check

oil level again (See

Checking

and

Adding

Oil).

REPLACEMENT

OF

THE HYDRAULIC FILTER

Replace

the

hydraulic

filter

every

1

00

hours

of

operation.

To

replace

the

hydraulic

filter

element:

1.

Remove

the

filter

element

(Fig.

68,

Item

1).

Let

the

oil

flow

into

a

container.

2.

Clean

the

surface

of

the

filter

head

where

the

filter

element

makes

contact

with

the

filter

head.

3.

Lubricate

the

rubber

gasket

on

the

filter

element

with

oil.

4.

Install

the

filter

element.

Tighten

the

filter

by

hand

only.

5.

Check

for

leaks

after

you

operate

the

Bobcat

loader.

FINAL DRIVE TRANSMISSION (CHAINCASE)

The

chaincase

contains

the

final

drive

sprocket

and

the

chains.

The

chaincase

is

filled

with

the

same

type

of

oil as

the

hydraulic/hydrostatic

system

for

chain

lubrication.

Refer

to

"Specifications"

on page

62.

To

check

the

chaincase

oil level:

1.

Put

the

Bobcat

loader

on

a level

surface.

2.

Remove

the

plug

at

the

front

of

the

transmission

housing

(Fig.

69,

Item

1).

-32-

Fig.

67

Snap Ring

Fig.

68

Filter

Element

Fig.

69

Chain case Plug

743'Loader

Operator's

Manual

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