Troy-Bilt TB90BC - Manual (Page 17)

MAINTENANCE AND REPAIR INSTRUCTIONS
17
WARNING: To prevent serious injury, never
do maintenance or repairs with unit running.
Always do maintenance and repairs on a
cool unit. Disconnect spark plug wire to
ensure the unit will not start.
NOTE: Some maintenance procedures may require
special tools or skills. If you are unsure about
these procedures take your unit to an authorized
service dealer.
MAINTENANCE SCHEDULE
These required maintenance procedures should be
performed at the frequency stated in the table. They
should also be included as part of any seasonal tune-up.
Winding the Existing Inner Reel
1. Hold the outer spool with one hand and unscrew the
Bump Knob clockwise (Fig. 27). 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. 27).
3. Remove spring from the inner reel (Fig. 27).
4. Use a clean cloth to clean the the inner reel, spring,
shaft, and inner surface of the outer spool (Fig. 28).
Inner Reel
Spring
Outer Spool
Bump Knob
Bolt
Fig. 27
LINE INSTALLATION
This section covers both SplitLine™ and standard single
line installation.
Always use geniune Troy-Bilt™ 0.105 in. (2.667 mm)
replacement line. Line other than specified may make the
engine overheat or fail.
WARNING: Never use metal-reinforced line,
wire, chain, or rope, etc. 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
Indexing Teeth
Fig. 28
Fig. 29
FREQUENCY MAINTENANCE REQUIRED REFER TO:
Before Starting Engine Fill fuel tank with correct oil and fuel mixture. Page 12
Every 10 Hours Clean and re-oil air filter. Page 19
Every 25 Hours Check spark arrestor and clean. Page 20
Check spark plug condition and gap. Page 22
Every 50 Hours Inspect exhaust port and spark arrestor screen for clogging Page 20
or obstruction to assure maximum performance levels.
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 need of this
inspection, refer service to an authorized servicing
dealer, or establishment for repair. DO NOT attempt to
perform this process yourself as engine damage may
result from contaminants envolved in the cleaning
process for the port.