Each time the head is bumped, about 1 inch (25.4 mm) of trimming line releases. A
blade in the cutting head shield will cut the line to the proper length if any excess line
is released.
For best results, tap the bump knob on bare ground or hard soil. If attempting a line
release in tall grass, the engine may stall. Always keep the trimming line fully extended.
Line release becomes more difficult when the cutting line gets shorter.
NOTE:
Do not rest the Bump Head™ on the ground while the unit is running.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting head parallel to the ground.
• Do not force the cutting head. Allow the tip of the line to do the cutting, especially along walls. Cutting with more
than the tip will reduce cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear
or engine drag.
• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are
thrown away from the operator.
• Slowly move the unit into and out of the cutting area at the desired height. Move either in a forward-backward or
side-to-side motion. Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of the cutting line is dependent upon:
• Following the trimming techniques
• What vegetation is being cut
• Where vegetation is cut
For example, the line will wear faster when trimming against a foundation wall as
opposed to trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts, fences, etc..
Rotate the whole unit so that the cutting head is at a 30° angle to the ground (Fig. 12).
LINE INSTALLATION
Only use the trimming line described in the Specifications section. Other types of
trimming line may cause the engine 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 outer spool with one hand and unscrew the bump knob
counterclockwise (Fig. 13).
NOTE:
The outer spool will remain attached to the unit.
2. Inspect the bolt inside the bump knob to make sure it moves freely. Replace the
bump knob if it is damaged.
3. Remove the inner reel from the outer spool (Fig. 14).
4. Remove the spring from the inner reel (Fig. 14).
5. Use a clean cloth to clean the inner reel, spring, shaft and inner surface of the
outer spool.
6. Check the indexing teeth and holding slots for wear (Fig. 15). If necessary, remove
burrs or replace the inner reel and outer spool.
Proceed to Part 2 - Winding New Trimming Line onto the Inner Reel.
Part 2 - Winding New Trimming Line onto the Inner Reel
• If using single line, refer to Winding Single Line.
• If using split line, refer to Winding Split Line.
• If using a prewound inner reel, proceed to
Part 3 - Installing the Inner Reel
.
Winding Single Line
1. Cut two 8-foot (2.4 m) lengths of new single trimming line.
2. Insert the end of one line into the top hole in the inner reel (Fig. 16). Wind the line
tightly in the direction shown on the bottom of
the inner reel until about 6 inches (150 mm) of
line remains. Keep the line above the split wall.
Insert the 6-inch section into the nearest .095
holding slot (Fig. 17).
3. Insert the end of the other line into the bottom
hole in the inner reel (Fig. 18). Wind the line
tightly in the direction shown on the bottom of
the inner reel until about 3 to 9 inches (75 to
225 mm) of line remains. Keep the line below
the split wall. Insert the 3 to 9-inch section into
the opposite .095 holding slot (Fig. 19).
NOTE:
Failure to wind the line in the direction
indicated will cause the cutting head to operate
incorrectly.
Proceed to Part 3 - Installing the Inner Reel.
Winding Split Line
1. Cut one 6-foot (1.8 m) length of new split line
trimming line. Split each end about 6 inches
(150 mm).
2. Using one split end, insert one line into the top
hole and the other line into the bottom hole in
the inner reel (Fig. 20).
3. Wind the line tightly in the direction shown on
the bottom of the inner reel. The split wall will
automatically divide the line. Wind the line until
it is completely divided and about 6 inches
(150 mm) of line remains.
NOTE:
Failure to wind the line in the direction
indicated will cause the cutting head to operate
incorrectly.
4. Insert the two 6-inch sections into the two .095 holding slots (Fig. 21).
Proceed to Part 3 - Installing the Inner Reel.
Part 3 - Installing the Inner Reel
1. Pass the two line ends through the eyelets in the outer spool. Place the spring
inside the inner reel. Insert the inner reel into the outer spool. Push the inner reel
and outer spool together (Fig. 22).
NOTE:
The spring must be assembled on the inner reel before reassembling the
cutting head.
2. While holding the inner reel and outer spool together, firmly pull the two line ends
to release them from the holding slots.
3. While holding the inner reel and outer spool together, screw the bump knob on clockwise. Tighten the bump knob
securely.
INSTALLATION OF THE SPEEDLOCK™
Removing the Existing Inner Reel
Refer to Removing the Existing Inner Reel in the Maintenance and Repair Insturctions section that can be found in the
operator’s manual.
4
Installing the SpeedLock™
1. After removing the inner reel, place the
SpeedLock™ onto the shaft, making sure to
align the arrows with the eyelets in the outer
spool (Fig. 23).
2. Place the spring over the shaft and into the
recess in the SpeedLock™ Spool (Fig. 23).
3. While holding the outer spool in place, insert
the bolt located in the bump knob through the
end of the spring and into the end of the shaft
(Fig. 23).
4. While slightly compessing the spring, screw
the bump knob clockwise into the shaft (Fig.
23). Tighten Securely.
Installing the Trimming Line
1. Align the arrows on the SpeedLock with the
eyelets on the outer spool (Fig. 24).
2. Insert a piece of precut spiral line,
P/N
49UFSHLL953
, into an eyelet on the outer
spool (Fig. 24).
3. Push the line into the SpeedLock™ until it starts to show from the opposite side.
4. Adjust the line so that both ends are of equal length (Fig. 25).
5. While holding the outer spool in place, pull the SpeedLock™ away from the outer spool and twist the SpeedLock™
clockwise until the dot is inline with the eyelet or until it stops (Fig. 26).
6. Release the SpeedLock™ so that it snaps into place.
7. Check that the SpeedLock™ has seated completely into the outer spool. If it has not, repeat steps 5 thru 7.
Removing the Trimming Line
1. While holding the outer spool in place, pull the SpeedLock™ away from the outer spool and twist the SpeedLock™
counterclockwise until it stops. The arrows should align with the eyelets on the outer spool. (Fig. 24)
2. Release the SpeedLock™.
NOTE:
The SpeedLock™ should stand about 1/4 of an inch above the outer spool.
3. Firmly pull one end of the trimming line until the whole piece exits the outer spool.
REMOVING THE SPEEDLOCK™
1. While holding the outer spool in place, turn the bump knob counterclockwise until it completely unscrews from the
shaft.
2. Remove the spring.
3. Remove the SpeedLock™.
AIR FILTER MAINTENANCE
Cleaning the Air Filter
Clean the air filter every 10 hours of operation. It is an important item to maintain.
Failure to maintain the air filter properly can result in poor performance or can cause
permanent damage to the engine.
1. Open the air filter cover by pressing the lock tab in and pulling out on the air filter
cover (Fig. 27).
2. Remove the air filter (Fig. 27).
3. Wash the filter in detergent and water. Rinse the filter thoroughly and allow it to dry.
4. Apply enough clean SAE 30 motor oil to lightly coat the filter.
5. Squeeze the filter to spread and remove excess oil.
6. Replace the air filter into the air filter cover (Fig. 27).
NOTE:
Operating the unit without the air filter
WILL VOID
the warranty.
7. Close the air filter cover by swinging it to the left and then pressing it down until the lock tab snaps into place (Fig. 27).
IDLE SPEED ADJUSTMENT
NOTE:
Careless adjustments can seriously damage the unit. An authorized service dealer should make carburetor
adjustments.
If, after checking the fuel mixture and cleaning the air filter, the engine still will not idle, adjust the idle speed screw as follows:
1. Start the engine and run for one minute to warm up.
Refer to Starting/Stopping Instructions.
2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small
phillips screwdriver into the idle adjustment screw (Fig. 28). Turn the idle speed
screw
clockwise
1/8 of a turn at a time (as needed) until the engine idles smoothly.
3. If the engine appears to be idling too fast, turn the idle speed screw
counterclockwise
1/8 of a turn at a time (as needed), to reduce idle speed.
Checking the fuel mixture, cleaning the air filter and adjusting the idle speed should
solve most engine problems. If not and all of the following are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
REPLACING THE SPARK PLUG
Use replacement #
753-06193
, a
Champion RDJ7J
spark plug, or equivalent. The correct air gap is
0.025 inch (0.635 mm)
.
Remove the plug after every 25 hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug wire firmly and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8-inch socket counterclockwise.
3. Replace a cracked, fouled or dirty spark plug. Set the air gap at
0.025 in. (0.635 mm)
using a feeler gauge (Fig. 29).
4. Install a correctly-gapped spark plug in the cylinder head. Tighten by turning the
5/8-inch socket clockwise until snug.
If using a torque wrench torque to:
110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.
CLEANING
Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain
aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off
any moisture with a soft cloth.
STORAGE
• Never store a fueled unit where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Store the unit locked up to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
If planning on storing the unit for an extended time, use the following storage procedure:
1. Drain all fuel from the fuel tank into a container with the same 2-cycle fuel mixture. Do not use fuel that has been
stored for more than 30 days. Dispose of the old fuel/oil mix in accordance to Federal, State and Local regulations.
2. Start the engine and allow it to run until it stalls. This ensures that all fuel has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 3-5 drops of any high quality motor oil or 2-cycle oil into
the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.
NOTE:
Remove the spark plug and drain all of the oil from the cylinder before attempting to start the unit after storage.
4. Thoroughly clean the unit and inspect it for any loose or damaged parts. Repair or replace damaged parts and
tighten loose screws, nuts or bolts. The unit is ready for storage.
MAINTENANCE AND REPAIR INSTRUCTIONS
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before you
clean or service it.
WARNING:
The cutting attachment will spin during idle speed adjustments. Wear protective clothing
and observe all safety instructions to prevent serious personal injury.
WARNING:
Do not sand blast, scrape or clean electrodes. Grit in
the engine could damage the cylinder.
Fig. 29
0.025 in.
(0.635 mm.)
Fig. 27
Air Filter Cover
Air Filter
Lock
Tab
Fig. 28
Idle Adjustment Screw
MAINTENANCE AND REPAIR INSTRUCTIONS
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 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.
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.
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.
FREQUENCY
MAINTENANCE REQUIRED
SEE
Before starting engine
Fill fuel tank with fresh fuel
p. 3
Every 10 hours
Clean and re-oil air filter
p. 4
Every 25 hours
Check spark plug condition and gap
p. 4
Outer Spool
Fig. 23
Trimmer
Line
Fig. 24
Eyelet
Shaft
Arrow
Eyelet
SpeedLock™
Spring
Recess
Bump
Knob™
Trimmer
Line
Fig. 25
Even
Cutting Head
Fig. 26
Dot
SpeedLock™
Eyelet
Fig. 12
OPERATING INSTRUCTIONS
Fig. 11
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before you
clean or service it.
Holding Slot
Fig. 17
Fig. 19
Holding Slots
Fig. 21
Indexing Teeth
Fig. 15
Outer Spool
Fig. 22
Holding Slots
Top Hole
Fig. 16
Fig. 18
Top Hole
Fig. 20
Split Wall
Split Wall
Bottom Hole
Split Wall
Holding Slot
Split Wall
Bottom Hole
Split Wall
Inner Reel
Bump Knob
Spring
Eyelets
Bolt
Outer Spool
Fig. 13
Outer Spool
Spring
Inner Reel
Fig. 14
Bump Knob
Shaft
WARNING:
Never use metal-reinforced line, wire, chain or rope.
These can break off and become dangerous projectiles.
