Installation - Troy-Bilt 7 HP Technical Manual

PTO HORSE MODEL
TECHNICAL MANUAL
Page 6-3 4/90
SECTION 6: Tiller Attachment Transmission
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 trans-
mission. If the cup is scored or
excessively worn, discard the
bearing and bearing cup.
Inspect for chipped or broken
roller bearings, and inspect the
bearing cage for damage.
Installation
Use Figure 6-1 as a reference for
part locations in these instructions.
1. Spread a layer of #30 weight
oil on the inside of the front bear-
ing cup (14). Make sure the
beveled cup is facing the correct
way to receive the bearing and
insert the bearing cup into the
front of the tiller housing.
Note: Remember to match the
bearings to the bearing cups as
you found them before
disassembly.
2. Install the (internal) snap
ring (15) used to retain the front
bearing cup. Make sure the flat
side of the snap ring is towards
the front of the tiller attachment
(towards the PTO power unit).
Although not easy to observe, the
snap ring has a flat side and a
rounded side.
If you have some difficulty insert-
ing the snap ring in the groove,
insert the ring past the groove.
Then use the drive shaft to slide
the ring forward and into the
groove.
3. Using #30 weight oil, lubricate
both bearings on the drive shaft.
Note:
Follow this procedure to
install new bearings on the drive
shaft:
a. On the welded worm style drive
shaft only, place the shoulder
washer (17) on the front of the
drive shaft.
b. Lubricate the new bearings
with #30 weight oil.
c. Using an arbor press, install
the front bearing until it stops at
the drive shaft shoulder. Install the
rear bearing until it stops against
the worm.
4. Insert the tiller drive shaft (11)
through the rear of the tiller
housing.
5. Spread a layer of #30 weight
oil on the inside of the rear bear-
ing cup (12). Make sure the
beveled cup is facing the correct
way to receive the bearing. Insert
the bearing cup into the back of
the tiller housing.
6. Place a gasket (9) on the rear
bearing cap (7) and gently tap the
cap into place. Securely attach the
cap with all three screws but do
not use a gasket sealer on the
screws or install nylon washers at
this point. You will next check for
play in the drive shaft.
7. Using a mallet, tap the drive
shaft to the rear to seat the bear-
ing cup. Push and pull the forward
end of the tiller drive shaft. You
should feel between .005" and
.010" play in the shaft.
Remove the rear bearing cap and
shim accordingly (start with the
thinnest shims). Repeat this
procedure until the forward and
backward play in the drive shaft is
between .005" and .010".
8. Remove the three screws from
the rear bearing cap.
9. Install the rear bearing cap
and secure it with screws (6) and
nylon washers (8). If washers are
not available, you can coat the tip
of the screws with a layer of non-
hardening gasket sealer.
10. Apply a layer of non-
hardening gasket sealer to the
outside edge of the tiller drive
shaft oil seal (13). Then install the
oil seal.
11. Install the (external) rear
snap ring (2a) that retains the dog
clutch to the shaft. Make sure the
flat side of the snap ring is towards
the rear of the tiller attachment.
12. Install the dog clutch
shim (5).
13. Install the dog clutch
spring (4).
14. Install the key (3) in the
keyway.
15. Slide the dog clutch (1) over
the key, with the "ears" on the
clutch facing forward.
16. Push the dog clutch in and
install the (external) snap ring (2)
that retains the dog clutch to the
shaft. Make sure the flat side of
the snap ring is towards the front
of the tiller attachment.
If you have some difficulty insert-
ing the snap ring in the groove,
insert the ring past the groove.
Then let the dog clutch slide for-
ward and it will push the ring
forward into the groove.
17. Install the tiller tine shaft. See
the instructions in this section.
Tiller Tine Shaft
Assembly
These instructions describe how
to remove, inspect, and install the
tiller attachment's tine shaft
assembly.
Use Figure 6-2 as a reference
for part locations in these
instructions.
Removal
You will have to disassemble the
tiller tine shaft assembly to replace
a damaged worm gear, bearing, or
shaft. Also, you will have to
remove the tiller tine shaft to
remove the tiller drive shaft. See