Troy-Bilt 21AE682W766 Operator's Manual page 21

Throttle Cable
The throttle lever settings are factory adjusted,
so unnecessary adjustments should not be made.
However, if the engine does not start or stop, or
respond immediately to various throttle lever
settings, then adjustments may be necessary. Please
refer to the Engine Operator's Manual supplied with
your tiller for specific adjustment instructions.
Ignition System
Your engine is equipped with an electronic ignition.
It does not have a condenser or points, so there is no
need to perform any regular tune-up maintenance
on this system other than adjusting or replacing the
spark plug.
Spark Plug
1. The spark plug must be in good condition for
proper engine operation. Remove and inspect
the plug every 50 operating hours or annually,
whichever occurs first. The correct electrode
gap is .030". Check the gap with a feeler gauge.
Do not use a spark plug if the porcelain is
cracked, the electrodes are pitted or burned,
or if other visible damage is present.
NOTE: Do not wire brush or sandblast the
spark plug to clean it — loose particles can
enter the engine, causing damage. To replace
the plug, first tighten it securely by hand, then
use a spark plug wrench to tighten the plug an
extra 1⁄4 turn.
Off-Season Storage
When your tiller will not be used during the off-
season, prepare it for storage with the following
steps:
1. Clean the tiller and the engine.
2. Do routine tiller lubrication and check for
loose hardware.
3. Protect the engine from deterioration or
damage by referring to the engine storage
instructions in your engine manual literature.
4. When engine is still warm, drain oil from
engine crankcase. Refill with fresh motor oil.
5. Protect the internal cylinder against rust by
removing the spark plug and pouring one
ounce of clean engine oil into spark plug hole.
Then slowly pull out the recoil start rope 2 or
3 times to distribute the oil internally. Replace
spark plug, but do not reconnect the plug
wire. Pull the rope until resistance is felt — let
rope rewind.
6. Charge the battery (electric start option). Store
the battery in cool, dry location.
7. Move the Wheels/Tines/PTO Drive Lever to
NEUTRAL position. Keep the tiller in a clean,
dry area.
8. Never store the tiller with fuel in the fuel
tank in an enclosed area where gas fumes
could reach an open flame or spark, or where
ignition sources are present (space heaters,
hot water heaters, furnaces, etc.).
Belt Replacement
Drive Belt
1. Move the Wheels/Tines/PTO Drive Lever to
NEUTRAL position.
2. While kneeling on the right side of the tiller,
create slack in the belt by reaching over to the
left side of the pulleys and pushing in on the
center of the belt with your finger.
3. Use your right hand to move the belt down and
away from the lower pulley, in the direction of
the engine. See Figure 5-25.
Drive Belt
Figure 5-25
4. Push the belt upward to create slack in the belt.
See Figure 5-26.
Push Belt Up
Figure 5-26
5. Lift the top half of the belt up and over the
upper pulley and the rubber reverse disc,
moving it in front of the reverse disc. See
Figure 5-27.
Reverse Disc
Figure 5-27
6. Push the Wheels/Tines/PTO Drive Lever down
into the FORWARD position. This increases
the distance between the upper and lower
pulleys. Next, lift and pull the entire belt out
from between the pulleys. See Figure 5-28.
Lower Pulley
Pulley
7. Place the Wheels/Tines/PTO Drive Lever in
FORWARD position.
8. Squeeze the belt in the middle and insert one
end in between the pulleys. See Figure 5-28.
9. Push the belt forward then down until it is
looped over the lower pulley. See Figure 5-26.
Do not yet seat it in either of the lower pulley's
grooves.
NOTE: A blunt object, like a ruler, can help you
push the belt downward if needed.
10. Move the top half of the belt up and over the
rubber reverse disc, but do not seat it in either
of the grooves in the top pulley.
11. Place the Wheels/Tines/PTO Drive Lever in
NEUTRAL.
12. Move the top half of the belt into the HIGH
Range groove, the groove closest to the
engine, on the top pulley. See Figure 5-29.
Drive Belt
13. Move the bottom half of the belt into the HIGH
Range groove of the lower pulley. If extra slack
is needed, hold up Wheels/Tines/PTO Drive
Lever while moving the belt. Verify the belt is
seated properly on the pulleys.
14. To move the belt to the Low Range position.
See Changing Belt Speed in the Operation
Section.
15. After installing the belt, check and adjust for
correct belt tension as explained previously.
Drive Belt
Figure 5-28
Drive
Belt
Figure 5-29
S 5 — S
ection ervice
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