SECTION
6:
Tiller
Attachment
Transmission
PTO
HORSE
MODEL
TECHNICAL
MANUAL
Page
6-2
4/90
.-
3.
Remove the
dog
clutch and
the key (3).
4.
Remove the dog clutch
spring (4).
5.
Remove the dog clutch
shim (5).
6.
Remove the second (external)
snap ring (2a).
7.
Remove the three bolts
(6)
that secure the rear bearing cap
(7), also removing and discarding
the nylon washers (8), if any. Have
a pan ready
to
catch the gear oil
that will
pour
out
when you
remove the rear bearing cap in the
next step.
8.
Remove the rear bearing cap
and the gasket (9). Discard the
gasket.
9.
Use a rubber hammer to tap
the forward end of the drive shaft
(11)
toward the rear of the hous-
ing. As you are tapping the shaft,
catch the bearing cap shims (10)
and bearing
cup
(12)
at the rear
of
the shaft. Discard the shims. Drive
the shaft
out
until the drive shaft
worm clears the housing. Leave
the drive shaft in this position until
you complete step
10.
Note: Keep each bearing
cup
paired with its bearing if you
intend
to
reuse them. Each bear-
ing
cup
wears differently
accord-
ing
to
its bearing.
10.
Remove the tiller tine shaft
assembly. See the tiller tine shaft
removal instructions in this sec-
tion. You must remove the tiller
tine shaft before you can
com.;.
pletely remove the tiller drive
shaft.
11.
Remove the tiller drive shaft.
12.
Remove the oil seal
(13)
by
placing a long bar
through
the
rear
of
the housing and tapping
the seal out.
Take care not to damage the bear-
ing
cup
(14), snap ring (15),
or
tiller housing.
13.
Remove the (internal) snap
ring
(15)
that retains the front
bearing
cup
(14)
usjng a pair
of
snap ring pliers.
14.
Remove the bearing cup. If
the bearing
cup
resists, insert an
old tiller drive shaft into the back
of
the transmission housing and
use its bearing
to
nudge the bear-
ing
cup
forward. It
is
not recom-
mended that you use a
good
drive
shaft for this.
Note: Remember
to
keep track
of
which bearing cups
go
with which
bearings.
You
will need
to
assem-
ble them
in
the same pairs.
15.
After the drive shaft is
removed and you have an empty
tiller housing,
thoroughly
degrease and clean the inside and
outside of the housing.
16.
The drive shaft bearings (16)
are pressed-on and can be
removed (if necessary) with an
arbor
press and a bearing puller
attachment. On the welded worm
style drive shaft only, remove the
shoulder washer (17) after remov-
ing the
front
bearing.
Inspection '
These instructions describe
how
to
inspect parts on the tiller drive
shaft. In addition
to
inspecting the
parts you have removed from the
tiller housing, you should also
inspect any replacement parts you
will use.
Note:
Thoroughly
degrease and
clean all parts before inspection.
Drive Shaft -
• The drive shaft should not be
scored, pitted,
or
corroded where
the oil seal
is
located. If the shaft
is
lightly corroded, you
might
be
able
to
clean it using an emery
cloth. If the shaft
is
slightly scored
or
pitted you
might
be able
to
adjust the position
of
the
front
seal
so that it
is
seated on a
smooth
part of the shaft. If the drive shaft
is excessively pitted
or
corroded,
especially in the area where the oil
seal seats, discard the drive shaft.
• Inspect the drive shaft
for
burrs
or
rough spots at the ends
of
the
shaft and where the bearings fit on
the shaft. Use a file
or
emery cloth
to
remove rough spots
or
burrs,
being careful not to remove
too
much metal where the bearings
will be seated. (Doing so will pre-
vent the proper fit of the bearings
on the shaft.)
• The keyway should be just
wide enough
for
the key
to
fit. If
the keyway expands and becomes
too
wide; discard the tiller drive
shaft.
• The
two
snap ring grooves
should be just wide enough to fit
the snap ring. If the groove
becomes
too
wide, you will have
to
discard the tiller drive shaft.
Also, the forward-facing edges
of
the grooves should not be
rounded off; these are the edges
that bear the force of the snap
ring. If this edge
is
rounded you
must discard the tiller drive shaft.
Worm - The
worm
should not be
excessively worn. Since
only
the
middle of the
worm
is
in contact
with the bronze
worm
gear on the
tiller tine shaft, you can compare
the end
of
the worm (on the tiller
drive shaft) with the middle. If the
width
of
the teeth in the middle
is
half
or
less than the width
of
the
teeth at the ends, discard the tiller
drive shaft.
Also, inspect the
worm
for
heat
damage. If the
worm
has a bluish
color
then proper lubrication has
not been maintained; discard the
tiller drive shaft.
Bearings - If the bearing has a
bluish
color
then proper lubrica-
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