18
MAINTENANCE SCHEDULE
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 the unit to
an MTD authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission control
devices and system may be performed by an MTD authorized
service dealer.
NOTE: Please read the California/EPA statement that came with the
unit for a complete listing of terms and coverage for the
emissions control devices, such as the spark arrestor, muffler,
carburetor, etc.
MAINTENANCE
FREQUENCY
MAINTENANCE REQUIRED
Every 10 hours
• Clean and re-oil the air filter. Refer to
Maintaining the Air Filter.
Every 25 hours
• Check the spark plug condition and gap.
Refer to Maintaining the Spark Plug.
WARNING:
To avoid serious personal injury, always stop
the engine and allow it to cool before cleaning or maintaining
the unit. Never perform cleaning or maintenance while the
unit is running. Disconnect the spark plug wire to prevent
the unit from starting accidentally.
WARNING:
Wear protective clothing and observe all
safety instructions to prevent serious personal injury.
REPLACING THE TRIMMING LINE
Only use the trimming line described in the Specifications section.
Other types of trimming line may cause the unit to overheat or fail.
NOTE: Always use the correct line length when installing trimming
line. The line may not release properly if the line is too long.
Part 1 - Removing the Inner Reel
1. Hold the cutting head in place (Fig. 27). Turn the bump knob
clockwise to unscrew it from the cutting head (Fig. 27).
NOTE: The outer spool (Fig. 28) will remain attached to the unit.
2. Inspect the bolt inside the bump knob to make sure it moves
freely (Fig. 27). Replace the bump knob if it is damaged.
3. Remove the inner reel from the outer spool (Fig. 28).
4. Remove the spring from the inner reel (Fig. 28).
5. Use a clean cloth to clean the inner reel, spring, arbor and inner
surface of the outer spool.
6. Check the indexing teeth and holding slots for wear (Fig. 29). If
necessary, remove burrs or replace the inner reel and outer spool.
Proceed to Part 2 - Winding New Trimming Line onto the Inner Reel.
WARNING:
Never use metal-reinforced line, wire, chain or
rope. These can break off and become dangerous projectiles.
Fig. 28
Outer Spool
Spring
Inner Reel
Arbor
Fig. 27
Bolt
Bump Knob
Cutting Head
Arbor
