Inspection - Troy-Bilt 7 HP Technical Manual

SECTION 6: Tiller Attachment Transmission
PTO HORSE MODEL
TECHNICAL MANUAL
Page 6-2 4/90
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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-