HOLDING THE UNIT
WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.
AIR FILTER MAINTENANCE
WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it.
Before operating the unit, stand in the operating position (Fig. 9). Check for the following:
• | The operator is wearing eye protection and proper clothing |
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• The operator’s left arm is straight, the left hand holding the |
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• The unit is at waist level |
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• | The cutting head is parallel to the ground and easily contacts the grass | Fig. 9 |
| without the need to bend over |
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WARNING: Do not remove or alter the line cutting blade assembly. Excessive line length will cause premature engine failure and / or unit damage.
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting head allows the release of trimming line without stopping the engine. To release more line, lightly tap the cutting head on the ground (Fig. 10)
while operating the unit at high speed.
NOTE: Always keep the trimming line fully extended. Line release becomes more difficult when the cutting line gets shorter.
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 keepFig. 10
the trimming line fully extended. Line release becomes more difficult when the cutting line gets shorter.
Cleaning the Air Filter
Failure to maintain your air filter properly can result in poor performance or can cause permanent damage to your engine.
1.Open the air filter cover by unscrewing the cover screw (Fig. 16).
2.Remove the air filter and the screen that sits behind it (Fig. 16).
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 and the screen that sits behind it (Fig. 16).
NOTE: Operating the unit without the air filter will VOID the warranty.
7.Reinstall the air filter cover. Insert the hooks on the air filter housing into the slots on the air filter cover (Fig. 16).
Air Filter
Air Filter Cover
Cover
Screw
Slots
Air Filter 
Cover
Air Filter Housing
Hooks
Cover Screw
Hole
Air Filter
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 |
8. Swing the air filter cover to the |
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right and align the cover screw |
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Fig. 16 | |||
with the cover screw hole (Fig. | |||
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16). Tighten the cover screw to secure the air filter cover. |
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NOTE: Do not over tighten as this may strip the screw. |
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IDLE SPEED ADJUSTMENT |
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Housing
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. |
The idle speed of the engine is adjustable. An idle adjustment screw is between the air filter cover and the engine starter housing (Fig. 17).
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
• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. |
follows:
Idle Speed Screw
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
• 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 cutFig. 11 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. 11).
MAINTENANCE AND REPAIR INSTRUCTIONS
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
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to any
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any
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.
FREQUENCY | MAINTENANCE REQUIRED | SEE |
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Before starting engine | Fill fuel tank with fresh fuel | p. 3 |
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Every 10 hours | Clean and | p. 4 |
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Every 25 hours | Check spark plug condition and gap | p. 4 |
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REMOVING THE LINE
WARNING: Never use
1. Start the engine and run for one minute to warm up. Refer to Starting and 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. 17). 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 |
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fast, turn the idle speed screw |
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counterclockwise 1/8 of a turn at a | Fig. 17 |
time (as needed), to reduce idle speed. |
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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
WARNING: The cutting attachment will spin during idle speed adjustments. Wear protective clothing and observe all safety instructions to prevent serious personal injury.
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
REPLACING THE SPARK PLUG
Use replacement
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
counterclockwise.
WARNING: Do not sand blast, scrape or clean electrodes. Grit in the engine could damage the cylinder.
3. | Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. |
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4. | Install a |
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If using a torque wrench torque to:
CLEANING
WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it.
1. | Rotate the bump knob clockwise until all |
| line is inside the cutting head (Fig. 12). |
2. | Using a |
| tip into the line dimple and just under the |
| exposed portion of the line (Fig. 13) |
3. | Pull the line straight out until all line is |
Bump | ||
Screw Driver | ||
Knob | ||
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Trimmer
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. |
removed from the cutting head. |
Dimple
Line
• Store the unit locked up to prevent unauthorized use or damage. |
LINE INSTALLATION
Always use original equipment manufacturer 0.095 in. (2.41 mm) replacement line.
1.Align the arrows on the bump knob with the spool cover eyelets, if they are not already (Fig. 14).
Fig. 13
Arrows
• | Store the unit in a dry, |
• | Store the unit out of the reach of children. |
Short Term Storage (1-2 weeks)
1.Store the unit in a horizontal position. If this is not possible, store the unit vertically with the engine at the top.
2. Using 16 ft. (4.8 m) of 0.095 in. (2.41 mm) |
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replacement line push both ends of the line | Eyelet | Trimmer Line |
through the holes in the bump knob until | Fig. 14 | Fig. 15 |
they protrude through the eyelets on both |
sides of the cutting head. Continue pulling the line until approximately 8 ft. (2.4 m) is visible from both sides of the cutting head. (Fig. 15)
3.Hold the spool cover, turn the bump knob clockwise to wind the line around the spool until about 5 in. (12.7 cm) is protruding from each side of the cutting head. (Fig. 12)
4.Start the unit and bump the cutting head on the ground until the desired cutting length is achieved. Excess line will be trimmed off by the line blade.
NOTE: If the cutting line ends are pulled into the cutting head or the line becomes twisted, refer to Removing the Line.
Long-term Storage
1. Remove the fuel cap, tip the unit and drain the fuel into an approved container.
NOTE: Do not use gasoline that has been stored for more than 30 days. Dispose of old gasoline in accordance with 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 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.
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