Troy-Bilt Horse Tiller Technical Manual - Page 32

PTO

HORSE

MODEL

TECHNICAL

MANUAL

Page

6-5

4/90

SECTION

6:

Tiller

Attachment

Transmission

b.

Force

the

shaft

down.

This

will

dislodge

one

bearing

(7).

Also

remove

the

washer

(9),

if

so

equipped.

10.

Turn

the

shaft

assembly

180

degrees

and

use

the

arbor

press

to

dislodge

the

other

bearing (and

washer,

if

so

equipped).

11.

Slide

the

worm

gear

(10)

off

the

shaft.

12.

Remove

the

Woodruff

key

(11),

if

necessary.

Inspection

These

instructions

describe

how

to

inspect

parts

on

the

tiller

tine

shaft.

In

addition

to

inspecting

the

parts

you

have

removed,

you

should

also

inspect

any

replace-

ment parts

you

will

use.

Note:

Thoroughly

degrease

and

clean

all

parts

before

inspection.

Tiller

Tine

Shaft

—

The

shaft

should

not

be

scored,

pitted,

or

corroded

in

the

areas

where

the

oil

seals

are

located.

If

the

shaft

is

scored,

pitted,

or

corroded,

try

using an

emery

cloth

to

clean

the

area.

If

the

scoring,

pitting,

or

cor-

rosion

is

too

extensive,

discard

the

shaft.

Also,

remove

any

burrs

or

rough

spots

on

the

ends

of

the

shaft.

Bronze

Worm

Gear

—

If

the

gear

teeth

are

damaged

or

excessively

worn,

discard

the

gear.

Bearings

—

If

the

bearing

has

a

bluish

color

then

proper

lubrica-

tion

has

not

been

maintained;

dis-

card

the

bearing

and

bearing

cup.

Also,

if

the

bearing

or

its

cup

is

scored

or

excessively

worn,

dirt

may

have

gotten

inside

the

hous-

ing.

If

so

discard

the

bearing

and

bearing

cup.

Test

each

roller

in

the

bearing

by

spinning

it

with

your

fingers.

If

a

roller

makes

a

growling

noise

or

does

not

move

at

all,

discard

the

bearing.

Washers

(on

tillers

so

equipped)

You

will

only

be

able

to

inspect

the

washers

if

you

should

need

to

dis-

assemble

the

shaft.

If

a

washer

is

warped,

discard

it.

Installation

1.

Install

the

Woodruff

key

(11)

in

the

shaft.

2.

Slide

the

bronze

worm

gear

(10)

on

the

shaft.

The

worm

gear

should

be

centered

over

the

key.

3.

Use

an

arbor

press

to

replace

a

bearing (and

washer,

if

so

equipped).

Make

sure

the

washer

is

between

the

bearing

and

the

bronze

worm

gear.

Note:

If

an

arbor

press

is

not

available,

use

the

housing

cover

(without

the

oil

seal

installed)

as

a

centering

device.

Simply

support

the

cover

on

open

vise

jaws

and

place

the

bearing

in

the

bearing

cup

(cup

must

be

installed

in

cover).

Add

the

washer

(if

so

equipped)

and

tap

the

shaft

down

with

a

soft

mallet.

Repeat

this

procedure

for

the

other

end,

mak-

ing

sure

the

bronze

worm

gear

is

centered

over

the

key.

4.

Turn

the

shaft

180

degrees

and

use

an

arbor

press

to

replace

the

other

bearing (and

washer,

if

so

equipped).

Check

to

make

sure

the

bronze

worm

gear

is

centered

over

the

key.

5.

Use

an

emery

cloth

to

clean

the

tine

shaft,

especially

around

the

oil

seal

locations.

6.

Replace

the

bearing

cup

(8)

in

the

housing

cover

(3)

by

using

a

piece

of

wood

as

a

driver

to

seat

the

cup.

Make

sure

the

tapered

bearing

cup

is

oriented

correctly

to

receive

the

bearing.

Also

make

sure

the

bearing

cup

goes

fully

inside

the

cover;

no

metal

should

and

the

inside

edge

of

the

cover.

7.

Use

the

same

technique

to

replace

the

bearing

cup

(8)

in

the

right

side

of

the

tiller

housing.

8.

If

not

already

installed,

install

the

tiller

drive

shaft

assembly.

See

the

installation

instructions

in

this

section.

9.

Insert

the

tiller

tine

shaft

assembly

(5)

in

the

tiller

housing.

Make

sure

the

side

on

the

bronze

worm

gear

whose

gear

edges

are

the

sharpest

is

facing

towards

the

rear

of

the

machine.

Note:

Since

the

front

of

each

gear

tooth

gets

little

wear

and

the

rear

of

each

tooth

gets

most

of

the

wear,

rotate

the

gear

so

that

the

best

side

is

facing

the

rear.

10.

Install

a

new

gasket

(4)

on

the

tiller

housing

cover

(3).

As

you

begin

the

shimming

procedure,

start

with

the

thinnest

gasket,

which

is

.010".

Do

not

install

the

oil

seals

(6)

at

this

time.

11.

Bolt

the

cover

on

using

two

bolts

(1)

about

180

degrees

apart.

Note:

Even

without

the

bolts

installed,

you

should

not

be

able

to

wiggle

the

cover

from

side

to

side

or

rotate

it.

Do

not

use

the

cover

if

you

can.

12.

Check

the

tine

shaft

for

play:

a.

Using

two

hands,

grasp

the

tiller

tine

shaft

and

rotate

the

shaft

back

and

forth.

b.

You

should

be

able

to

rotate

the

shaft

slightly

and

to

hear

a

small

click.

This

means

the

tiller

tine

shaft

is

shimmed

correctly.

c.

If

you

cannot

rotate

the

shaft

and

do

not

hear

a

click,

remove

the

.010"

gasket

and

install

a

.030"

gasket.

If

necessary,

begin

using

gaskets

in

pairs

to

gradually

increment

the

thickness

of

the

gasket.

For

example,

if

a

.030"

gasket

is

insufficient,

use

a

.030"

and

.010"

gasket

together.

If

these

Troy-Bilt Horse Tiller Technical Manual - Page 32

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