Troy-Bilt TB20DC Operator's Manual page 9

MAINTENANCE SCHEDULE
WARNING:
To prevent serious injury, never
perform maintenance or repairs with unit running.
Always service and repair a cool unit. Disconnect
the spark plug wire to ensure that the unit cannot
start.
Perform these required maintenance procedures at the
frequency stated in the table. These procedures should also be
a part of any seasonal tune-up.
NOTE: Some maintenance procedures may require special
tools or skills. If you are unsure about these
procedures take your unit to any non-road engine
repair establishment, individual or authorized service
dealer.
NOTE: Maintenance, replacement, or repair of the emission
control devices and system may be performed by any
non-road engine repair establishment, individual or
authorized service dealer.
In order to assure peak performance of your engine, inspection
of the engine exhaust port may be necessary after 50 hours of
operation. If you notice lost RPM, poor performance or general
lack of acceleration, this service may be required. If you feel
your engine is in need of this inspection, refer service to any
non-road engine repair establishment, individual or authorized
service dealer for repair. DO NOT attempt to perform this
process yourself as engine damage may result from
contaminants involved in the cleaning process for the port.
FREQUENCY MAINTENANCE REQUIRED
Before starting Fill fuel tank with fresh fuel
Every 10 hours Clean and re-oil air filter
Check and clean spark arrestor
Every 25 hours Check spark plug condition
and gap
Inspect exhaust port and spark
arrestor screen for clogging or
Every 50 hours
obstruction to assure
maximum performance levels
LINE INSTALLATION
This section covers both SplitLine™ and standard single line
installation.
Always use original equipment manufacturer 0.080 in. (2.03
mm) replacement line. Line other than the specified may make
the engine overheat or fail.
WARNING:
Never use metal-reinforced line,
wire, chain or rope. These can break off and
become dangerous projectiles.
There are two methods to replace the trimming line:
• Wind the inner reel with new line
• Install a prewound inner reel
Winding the Existing Inner Reel
1. Hold the outer spool with one hand and unscrew the Bump
Knob™ counterclockwise (Fig. 15). Inspect the bolt inside
the Bump Knob to make sure it moves freely. Replace the
Bump Knob if damaged.
2. Remove the inner reel from the outer spool (Fig. 16).
3. Remove spring from the inner reel (Fig. 16).
4. Use a clean cloth to clean the the inner reel, spring, shaft,
and inner surface of the outer spool.
5. Check the indexing teeth on the inner reel and outer spool
for wear (Fig. 17). If necessary, remove burrs or replace the
reel and spool.
MAINTENANCE AND REPAIR INSTRUCTIONS
REFER
Page 3
Page 11
Page 11
Page 12
Page 11
Indexing Teeth
NOTE: SplitLine™ can only be used with the inner reel with
the slotted holes. Single line can be used on either type
of inner reel. Use Figure 18 to identify the inner reel you
have.
NOTE: Always use the correct line length when installing
trimming line on the unit. The line may not release
properly if the line is too long.
For Use with Single
Line ONLY
Bolt
Bump Knob™
Fig. 15
Outer Spool
Spring
Inner Reel
Fig. 16
Fig. 17
For Use with SplitLine™
or Single Line
Slotted
Holes
Fig. 18
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