Troy-Bilt Horse Tiller Technical Manual - Page 25

SECTION

5:

PTO

Power

Unit

Transmission

PTO

HORSE

MODEL

TECHNICAL

MANUAL

Page

5-9

4/90

Removal

Before

you

can

service

the

wheel

shaft

assembly,

you

must

first

remove

the

pinion

shaft

assembly.

See

the

pinion

shaft

removal

instructions

in

this

section.

1.

Remove

the

left

side

oil

seal

(1).

You

can

remove

the

seal

with

a

screwdriver

and

hammer

by

tap-

ping

in

at

an

angle

and

prying

against

the the

transmission

case

(if

necessary,

use

two

screwdriv-

ers

positioned

at

opposite

sides

of

the

seal).

Note:

Be

careful

not

to

damage

the

wheel

shaft

with

the

screw-

driver(s)

while

prying.

2.

Remove

and

discard

the

left

side

(external)

snap

ring

(2)

that

retains

the

wheel

shaft

(5)

inside

the

housing.

3.

Use

a

magnet

to

remove

the

shim(s)

(3).

Discard

the

shim(s).

4.

Shift

the

eccentric

lever

(12)

into

neutral.

The

clutch

and

gears

must

be

disengaged.

5.

Using

a

rubber

mallet,

tap

the

wheel

shaft

to

the

right

while

you

slowly

turn

the

fast

speed

(small-

er)

gear

(4).

The

object

is

to

line

up

the

key

(14)

in

the

shaft

with

the

keyway

in

the

fast

speed

gear.

This

is

a

trial

and

error

procedure.

Keep

trying

until

you

feel

the

key

in

the

shaft

begin

to

advance

through

the

fast

speed

gear.

After

the

key

begins

to

pass

through

the

gear,

continue

until

you

remove

the

wheel

shaft

(5)

along

with

the

right

side

bronze

bushing

(8),

oil

seal

(1),

snap

ring

(6),

and

shims

(7).

Discard

the

bushing,

oil

seal,

snap

ring,

and

shims(s).

6.

Check

that

the

hi

-pro

key

(14)

is

still

attached

to

the

wheel

shaft.

If

it

is

not,

retrieve

it

from

inside

the

housing.

7.

Lift

the

stow

speed

(larger)

gear

(9),

fast

speed

gear,

clutch

(10),

and

three

clutch

guide

pins

(11)

out

of

the

housing.

8.

Remove

and

discard

the

bronze

bushing

(13)

from

the

left

side

of

the

housing.

Use

an

old

wheel

shaft

inserted

from

the

right-hand

side

to

drive

the

bush-

ing

out.

Inspection

These

instructions

describe

how

to

inspect

vital

parts

on

the

wheel

shaft

assembly.

In

addition

to

inspecting

the

parts

you

have

removed,

you

should

also

inspect

any

replacement

parts

you

will

use.

Note:

Thoroughly

degrease

and

clean

all

parts

before

inspection.

Wheel

Shaft

-

•

If

the

wheel

shaft

is

scored

or

pitted

around

the

oil

seal

areas,

you

may

be

able

to

relocate

the

oil

seals

further

out,

or

in,

in

order

to

avoid

the

damaged

area.

•

If

there

is

corrosion

around

the

oil

seal

areas,

try

using

an

emery

cloth

to

clean

the

area.

If

the

wheel

shaft

is

badly

scored

or

pit-

ted

around

the

oil

seal

areas,

dis-

card

the

wheel

shaft.

•

If

the

seal

area

is

excessively

worn,

discard

the

wheel

shaft.

•

Examine

both

ends

of

the

wheel

shaft

for

burrs

or

rough

edges

that

could

prevent

the

shaft

from

passing

through

the

gears

or

clutch.

Use

a

file

or

emery

cloth

to

remove

any

rough

spots.

•

If

the

outside

edges

of

the

snap

ring

grooves

are

rounded,

you

will

have

to

discard

the

wheel

shaft

as

these

edges

bear

the

force

of

the

snap

rings.

If

the

grooves

have

expanded

you

may

be

able

to

use

shims

to

take

up

the

slack.

If

not,

discard

the

wheel

shaft.

•

If

the

area

around

the

keyway

2.5"

.

has

bubbled

due

to

key

move-

ment,

discard

the

wheel

shaft.

See

"Testing

for

a

Bubbled

Wheel

Shaft"

in

Section

7.

Fast

and

Slow

Speed

Gears

-

•

If

there

are

any

broken

or

excessively

worn

teeth,

discard

the

gear.

•

If

the

clutch

dogs

have

worn

a

groove

more

than

1/4

through

the

wall

of

the

gear

(usually

due

to

speed

shifting),

discard

the

gear.

Clutch

—

•

If

the

clutch

dogs

are

exces-

sively

rounded,

discard

the

clutch.

•

If

any

clutch

dogs

are

missing,

discard

the

clutch.

•

If

the

keyway

is

damaged,

you

may

be

able

to

straighten

it

with

a

file.

Otherwise,

discard

the

clutch.

Note:

If

the

keyway

is

too

wide,

the

wheel

shaft

is

more

likely

to

bubble

and

you

may

need

to

replace

the

wheel

shaft

soon

afterwards.

Gear

Shifting

Guide

Pins

—

Make

sure

the

guide

pins

are

absolutely

straight.

If

a

pin

is

even

slightly

bent,

discard

it.

Installation

Before

you

install

the

wheel

shaft

assembly,

the

eccentric

shaft

assembly

must

first

be

installed.

See

the

eccentric

shaft

installation

instructions

in

this

section.

Use

Figure

5-7

as

a

reference

for

part

locations

in

these

instructions.

1.

Before

installing

the

wheel

shaft:

•

Make

sure

the

hi

-pro

key

(14)

is

firmly

seated

in

the

keyway.

•

Make

sure

the

clutch

(10)

and

fast

speed

gear

(4)

pass

freely

over

the

hi

-pro

key

in

the

wheel

shaft.

If

there

is

any

binding,

Troy-Bilt Horse Tiller Technical Manual - Page 25

Removal, Inspection, Installation

Page 25 highlights