Fiat 411 R - Roller Tooth Cross Section; Longitudinal Section of Roller Tooth Shaft

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The

lower

taper

rolier

bearing

outer

races

and

shims

(S,

Fig.

122).

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5‘.

To

avoid

eitering

the

setting

of

roiier

and

worm

gear,

the

shim

pack

S

thickness

shouid

be

varied

if

the

worm

gear,

the

roller

or

the

steering

box

have

been

replaced;

the

shims

pack

should

the/7

be

adjusted

as

foiiows:

a)

mount

the

worm

gear

assembly,

after

smearing

it

with

red

lead

compound,

and

adjust

rj‘/f,-‘&(3_r;§Q

of

taper

roller

taearings;

b)

mount

the

roller,

shaft,

cover

and

the

steering

arm;

C}

adjust

theroiier

and

worm

gear

bearing

aﬁggfds

ing

to

indications

following.

Note.

-

Each

variation

of

shims

S,

calls

for

a

new

adjustment

of

bearings

with

shims

T.

.

_

_

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1

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5

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,

fur

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t

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“T”

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1.8

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1%}

Fig.

122.

-

Roller

tooth

cross~sectinn.

Fig.

123.

-

Longitudinal

section

of

rolier

tooth

shaft.

R

=

Rc-Her

washers

-

S

=

Shims

centering

screw

to

roifer

-

E;

Gg

and

Gp

=

Sears

-

Vr

:

Adjusting

sci-9W_

T

=

Centering

shims

taper

‘nearing

adjusting

shims.

The

worm

gear,

with

the

taper

roiier

bearing

act-

justingshims

(T,

Fig.

122).

The

roller

shaft,

the

cover

and

the

steering

arm.

-...,,

Adiustment

of

rofier

and

worm

gear

bearing.

Mount

the

worm

gear

shaft

with

its

bearing

shims

and

check

it

for

ﬂee

rotation

which

must

be

ac-

complished

without

excessive

effort.

The

correct

functioning

of

the

mechanism

requires

that

the

distance

between

roiier

and

worm

gear

be

as

sm

aii

as

possible

and

corresponding

to

the

original

speciﬁcations.

To

this

end,

after

mounting

the

unit

and

positioned

the

steering

arm

as

in

Fig.

122(this

corresponding

to

straight

forward

motion

of

the

tractor)

the

adjusting

screw

(Vr,

Fig.

123)

should

be

screwed

on,

in

order

to

take

up

the

piay

between

roiier

and

worm

screw;

in

addition,

check

that

this

condition

remains

un-

varied

as

the

steering

wheel

is

turned

30°,

ieft

and

right.

After

adjustment,

tighten

the

lock

nut

of

screw

E/r.

To

refit

the

guide

box

assembly

to

tractor

reverse

the

dismantling

procedure.

After

assembly,

service

the

guide

box

with

SAE

90

oi!

and

the

drag

link

grease

nippie

with

chassis

grease.

75

I

3

5

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