PTO
HORSE
MODEL
TECHNICAL
MANUAL
Page
6-5
4/90
SECTION
6:
Tiller
Attachment
Transmission
e·
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 hoU$-
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
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