Troy-Bilt 21AE682W766 Operator's Manual page 22

Reverse Disc
Follow these steps to replace the reverse disc. If your
tiller has a Bumper Attachment mounted, it must be
removed first.
1. Move Wheels/Tines/PTO Drive Lever in
NEUTRAL position.
2. Wedge a 5⁄16"-thick board between the top of
the engine pulley and the cast iron housing
next to it. This immobilizes the pulley. Avoid
contacting the reverse disc.
3. Use a 9⁄16" wrench to loosen the mounting
bolt shown in Figure 5-30. Remember to
immobilize the pulley with the wood wedge
while loosening the bolt. If necessary, pry
the disc from the pulley with the tip of
a screwdriver. Back the bolt out as far as
possible. Then angle the disc a little to remove
it. Bring the bolt and lockwasher along with
the disc. Installing a new Reverse Disc.
Wood Wedge
Figure 5-30
4. Do steps 1-through-3,in the opposite order to
install the new reverse disc.
5. Tighten the mounting bolt securely, and check
for correct operation — see the Maintenance
& Adjustments section.
Tines
Inspect the tines for wear or damage after every 30
operating hours. The rate of wear depends upon the
hours of use and soil conditions. With use, the tines
get shorter, narrower and more pointed. See Figure
5-31.
Worn
Figure 5-31
22 S 5 — S
ection ervice
If badly worn, they lose the ability to till deeply. Worn
tines leave an ever-increasing gap in the middle of a
tilled row. The normal gap is 3" between the tine tips
— replace the tines when the gap widens to 5". See
Figure 5-32. The tines can be replaced individually or
as a complete set.
Replacing a Single Tine
Mounting Bolt
Reverse
Disc
1. Move the Wheels/Tines/PTO Drive Lever to
NEUTRAL, the Wheel Speed Lever to either
FAST or SLOW position, and the Tines/PTO
Clutch Lever to ENGAGE.
2. Gently tilt the tiller forward until the engine
rests on the ground.
3. Raise the hood flap at the back of the tiller and
tie it up with string.
4. Before removing a tine, note in which
direction the bent tip points. The new tine
must be installed in the same direction.
5. Use two 9⁄16" wrenches to remove the two bolts
and nuts securing the tine to the tine holder
plate. See Figure 5-33. Use penetrating oil on
the hardware if it is rusted or hard to remove.
Tine Shaft
New
Nut
Tines
Figure 5-32
WARNING! The tines or tine hooded
edges may be sharp . Wear thick gloves to
protect your hands from cuts or scrapes.
WARNING! Wear safety goggles to
protect your eyes . When loosening
hardware, do not hit a wrench with a
metal tool. This could shatter the tool or
wrench sending metal particles into your
eyes.
Bolt
Right-Side
Tine Holder
Left-Side
Tine Holder
Figure 5-33
6. Mount the new tine exactly the way the old
tine was positioned. (The sharp edge of the
tine, which enters the soil first, must face
forward when above the tine shaft.) Replace
the bolts and nuts and tighten them securely.
Replacing A Tine Holder Assembly
The 16 Bolo Tines are mounted eight per side on
left-side and right-side tine holders. Here's how to
replace the tines and holders as assemblies.
1. Follow steps 1-3 in Single Tine Replacement
above.
2. Identify the tine holders as left-side and right-
side holders — they must be replaced on the
same side from which they were removed.
Use a piece of chalk or a grease pencil to mark
them L and R.
3. Remove the two bolts and nuts securing each
holder. See Figure 5-33.
4. Use a soft mallet to drive the holder off the
tine shaft. Use a heavy hammer and block
of wood to knock off the immobilized tine
holder.
5. When the holder is off, clean all dirt and debris
from the shaft and the holder. Apply fresh
grease to the tine shaft.
Replacing Tines Holder Assembly
1. Replace the holder so the sharp tine edges
face forward (toward the front of the tiller). Tap
tine holder back on the tine shaft.
2. Grease the threads on the mounting bolt(s).
Install and tighten the bolt(s) securely.