Troy-Bilt 8 HP - Manual (Page 46)

Reverse drive maintenance
6-25: Move belt over reverse disc.
4.
Move the top half of the belt up
and over the rubber reverse disc,
but do not seat it in either of the
pulley grooves (Photo 6-25).
5. Place the Wheels/Tines/PTO
Drive Lever in “NEUTRAL”.
6. Move the top half of the belt
into the “HIGH RANGE” groove
(groove closest to the engine) of
the upper pulley (Photo 6-26).
Make sure the belt is fully seated
on both sides of the upper pulley.
7. Move the bottom half of the belt
into the “HIGH RANGE” groove
(groove closest to engine) of the
lo\A/er pulley (Photo 6-26). If extra
belt slack is needed, hold the
Wheels/Tines/PTO Drive Lever up
in “REVERSE” while moving the
belt. Make sure the belt is fully
seated on both sides of the lower
pulley.
8. To move the belt to the “LOW
RANGE” position, refer to “Chang­
ing Belt Speeds” in Section 3.
9. After installing the belt, check
and adjust for correct tension as
explained previously.
A
WARNING
To help avoid personal injury, stop
the engine, remove the electric
start key, disconnect the spark
plug wire, and let the engine and
muffler cool before inspecting, ad­
justing or replacing the reverse
drive components.
When you raise the Wheels/
Tines/PTO Drive Lever all the way
up for “REVERSE”, it lowers the
rotating rubber reverse disc on the
end of the engine pulley until it
contacts the transmission drive
pulley. The resulting friction be­
tween the reverse disc and the
transmission pulley causes the
transmission drive shaft to be
driven in a counterclockwise direc­
tion (as viewed from the operator’s
position behind the handlebars).
The drive shaft then turns the
wheel and tine shafts in a re­
verse direction.
The following instructions ex­
plain howto inspect, replace or
adjust the various reverse drive
components.
A. Reverse disc inspection
The reverse disc is made of a
steel disc with a special long-
lasting rubber compound bonded
to the rim. Because it is a wearing
part, the reverse disc should be
inspected after each 30 hours
of operation.
1. Measure the width of the facing
edge on the disc, as shown in
Photo 6-27. The disc should be
replaced before the edge is al­
lowed to reach Vs -inch thickness.
If the edge wears further than that,
then only the metal plate will re­
main and it could cause costly
damage if allowed to come in con­
tact with the transmission pulley.
2. Look for large cracks or miss­
ing chunks of rubber (small nicks
or gouges are okay, but keep a
close watch on them). A disc hav­
ing large cracks or gouges should
be replaced immediately.
IMPORTANT
You can help extend the life of the
reverse disc by always pausing
in “NEUTRAL” before shifting
between “FORWARD” and
“REVERSE”. Also remember that
the reverse disc is not designed
for long periods of continuous re­
verse operation. Use reverse drive
sparingly.
B. Replacing the reverse disc
Follow these simple steps to re­
move and replace the reverse disc.
If your tiller is equipped with a
Bumper/Guard Attachment, you
will have to remove the bumper to
give yourself enough working room.
To remove the reverse disc:
1. Place the Wheels/Tines/PTO
Drive Lever in “NEUTRAL”.
4^
11
6-26: Seat belt in upper pulley, then
lower pulley (“HIGH RANGE” position
shown).
i i. ;■
6-27: Measure disc edge for wear.
6-28: Wedge pulley with board and
loosen bolt.
44