TROY-BILT Operator's Manual

IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY

NOTE: For users on U.S. Forest Land and in the states of California, Maine, Oregon and Washington. All U.S. Forest Land and the state of California (Public Resources Codes 4442 and 4443), Oregon and Washington require, by law, that certain internal combustion engines operated on forest brush and/or grass-covered areas be equipped with a spark arrestor, maintained in effective working order, or the engine be constructed, equipped and maintained for the prevention of fire. Users should check with state or local authorities for regulations pertaining to these requirements. Failure to follow these requirements could subject users to liability or a fine. This unit is factory equipped with a spark arrestor. If replacement is required, Accessory Part 182747 Spark Arrestor Screen is available by contacting the service department at MTD Southwest Inc., 550 N. 54th St., Chandler, AZ 85226.

P/N 769-00400 (8/02) PRINTED IN USA

FINDING MODEL NUMBER

This operator's manual is an important part of a new trimmer. It will help assemble, prepare, and maintain the unit for best performance. Users should read and understand its contents.

Before assembling new equipment, locate the model plate on the equipment and copy the information from it in the space provided below. This information is very important if help is needed from the Customer Support Department or an authorized dealer.

• The model number can be located by looking at the underside of the engine housing. For future reference, copy the model number and the serial number of the equipment in the space provided.

Model/Parent Part Number: _________________________

Serial Number: _________________________

CALLING CUSTOMER SUPPORT

If there is difficulty assembling this product or questions regarding controls, operation, or maintenance, contact the Customer Support Department.

Call 1-(330)-558-7220 or 1-(866)-840-6483 to reach a Customer Support representative. Have the unit's model number and serial number ready when calling. The serial number will be requested to process the call.

For more details about the unit, visit the Troy-Bilt website at www.troybilt.com.

RULES FOR SAFE OPERATION

The purpose of safety symbols is to attract attention to possible dangers. The safety symbols, and their explanations, deserve careful attention and understanding. Safety warnings do not by themselves eliminate any danger. The instructions or warnings provided are not substitutes for proper accident prevention measures.

SYMBOL MEANING

• ⚠ SAFETY ALERT SYMBOL: Indicates danger, warning, or caution. Attention is required to avoid serious personal injury. May be used in conjunction with other symbols or pictographs.

• ⚠ WARNING - READ OPERATOR'S MANUAL: Read the Operator's Manual(s) and follow all warnings and safety instructions. Failure to do so can result in serious injury to the operator and/or bystanders.

• ⚠ WEAR EYE AND HEARING PROTECTION: Thrown objects and loud noise can cause severe eye injury and hearing loss. Wear eye protection meeting ANSI Z87.1-1989 standards and ear protection when operating this unit. Use a full face shield when needed.

• ⚠ KEEP BYSTANDERS AWAY: Keep all bystanders, especially children and pets, at least 50 feet (15 m.) from the operating area.

• ⚠ UNLEADED FUEL: Always use clean, fresh unleaded fuel.

• ⚠ OIL: Refer to operator's manual for the proper type of oil.

• ⚠ THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY: Do not operate without the cutting attachment shield in place. Keep away from the rotating cutting attachment.

• ⚠ ON/OFF STOP CONTROL (I): ON / START / RUN

• ⚠ ON/OFF STOP CONTROL (O): OFF OR STOP

• ⚠ HOT SURFACE WARNING: Do not touch a hot muffler or cylinder. These parts get extremely hot from operation and remain hot for a short time after being turned off.

• ⚠ SHARP BLADE: Sharp blade on cutting attachment shield. To prevent serious injury, do not touch line cutting blade.

California Proposition 65 Warning:

READ ALL INSTRUCTIONS BEFORE OPERATING

• Read the instructions carefully. Be familiar with the controls and proper use of the unit.
• Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.
• Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.
• Inspect the unit before use. Replace damaged parts. Check for fuel leaks. Ensure all fasteners are in place and secure. Replace cutting attachment parts that are cracked, chipped, or damaged in any way. Ensure the cutting attachment is properly installed and securely fastened. Ensure the cutting attachment shield is properly attached, and positioned as recommended. Failure to do so can result in personal injury to the operator and bystanders, as well as damage to the unit.
• Use only 0.095 inch (2.41 mm) diameter genuine Troy-Bilt replacement line. Never use metal-reinforced line, wire, or rope, etc. These can break off and become a dangerous projectile.
• Be aware of the risk of injury to the head, hands and feet.
• Clear the area to be cut before each use. Remove all objects such as rocks, broken glass, nails, wire, or string which can be thrown or become entangled in the cutting attachment. Clear the area of children, bystanders, and pets. At a minimum, keep all children, bystanders and pets outside a 50 feet (15 m.) radius; there still may be a risk to bystanders from thrown objects. Bystanders should be encouraged to wear eye protection. If approached, stop the engine and cutting attachment immediately.
• Squeeze the throttle control and check that it returns automatically to the idle position. Make all adjustments or repairs before using unit.
• This unit was not designed to be used as a brushcutter. Do not attach or operate this unit with any type of brushcutting blade or brushcutting attachment.

SAFETY WARNINGS FOR GAS TRIMMERS

• Store fuel only in containers specifically designed and approved for the storage of such materials.
• Always stop the engine and allow it to cool before filling the fuel tank. Never remove the cap of the fuel tank, or add fuel, when the engine is hot. Never operate the unit without the fuel cap securely in place. Loosen the fuel tank cap slowly to relieve any pressure in the tank.
• Add fuel in a clean, well-ventilated area outdoors where there are no sparks or flames. Slowly remove the fuel cap only after stopping engine. Do not smoke while fueling or mixing fuel. Wipe up any spilled fuel from the unit immediately.
• Avoid creating a source of ignition for spilled fuel. Do not start the engine until fuel vapors dissipate.
• Move the unit at least 30 feet (9.1 m) from the fueling source and site before starting the engine. Do not smoke. Keep sparks and open flames away from the area while adding fuel or operating the unit.

WHILE OPERATING

• Never start or run the unit inside a closed room or building. Breathing exhaust fumes can kill. Operate this unit only in a well ventilated area outdoors.
• Wear safety glasses or goggles that are marked as meeting ANSI Z87.1-1989 standards, and ear/hearing protection when operating this unit. Wear a face or dust mask if the operation is dusty. Long sleeve shirts are recommended.
• Wear heavy, long pants, boots and gloves. Do not wear loose clothing, jewelry, short pants, sandals or go barefoot. Secure hair above shoulder level.
• The cutting attachment shield must always be in place while operating the unit. Do not operate unit without both trimming lines extended, and the proper line installed. Do not extend the trimming line beyond the length of the shield.
• This unit has a clutch. The cutting attachment remains stationary when the engine is idling. If it does not, have the unit adjusted by an authorized service technician.
• Adjust the D-Handle to your size to provide the best grip.
• Be sure the cutting attachment is not in contact with anything before starting the unit.
• Use the unit only in daylight or good artificial light.
• Avoid accidental starting. Be in the starting position whenever pulling the starter rope. The operator and unit must be in a stable position while starting. See Starting/Stopping Instructions.
• Use the right tool. Only use this tool for the purpose intended.
• Do not overreach. Always keep proper footing and balance.
• Always hold the unit with both hands when operating. Keep a firm grip on both the front and rear handle or grips.
• Keep hands, face, and feet at a distance from all moving parts. Do not touch or try to stop the cutting attachment when it is rotating.
• Do not touch the engine or muffler. These parts get extremely hot from operation. When turned off they remain hot for a short time.
• Do not operate the engine faster than the speed needed to cut, trim or edge. Do not run the engine at high speed when not cutting.
• Always stop the engine when cutting is delayed or when walking from one cutting location to another.
• If a foreign object is struck or entangled, stop the engine immediately and check for damage. Do not operate before repairing damage. Do not operate the unit with loose or damaged parts.
• Stop and switch the engine to off for maintenance, repair, or for changing the cutting attachment or other attachments.
• Use only genuine manufacturer's replacement parts when servicing this unit. These parts are available from an authorized service dealer. Do not use parts, accessories or attachments not authorized by MTD for this unit. Doing so could lead to serious injury to the user, or damage to the unit, and void the warranty.
• Keep unit clean of vegetation and other materials. They may become lodged between the cutting attachment and shield.
• To reduce fire hazard, replace faulty muffler and spark arrestor, keep the engine and muffler free from grass, leaves, excessive grease or carbon build up.

OTHER SAFETY WARNINGS

• Never store the unit, with fuel in the tank, inside a building where fumes may reach an open flame or spark.
• Allow the engine to cool before storing or transporting. Secure the unit while transporting.
• Store the unit in a dry area, locked up or up high to prevent unauthorized use or damage, out of the reach of children.
• Never douse or squirt the unit with water or any other liquid. Keep handles dry, clean and free from debris. Clean after each use. See the Cleaning and Storage Instructions.
• Keep these instructions. Refer to them often and use them to instruct other users. If loaning this unit, also loan these instructions.

SAVE THESE INSTRUCTIONS

KNOW YOUR UNIT

APPLICATIONS

As a trimmer, the TB75SS is used for:

• Cutting grass and light weeds.
• Edging.
• Decorative trimming around trees, fences, etc.

Other optional accessories may be used with the TB75SS. Refer to Operating the EZ-Link System for a list of add-ons.

Key Components:

• EZ-Start™ Lever: For easy starting.
• Fuel Cap: Covers the fuel tank.
• Muffler Guard & Muffler: Protects and reduces engine noise.
• Starter Rope Grip: Used to start the engine.
• Spark Plug: Ignites the fuel mixture.
• Shaft Grip: Main handhold on the shaft.
• On/Off Stop Control: Controls engine power.
• Throttle Control: Regulates engine speed.
• Shoulder Strap Clip: Attachment point for a shoulder strap.
• EZ-Link™: System for attaching optional accessories.
• D-Handle: Adjustable handle for optimal grip.
• Air Filter/Muffler Cover: Protects internal components.
• Engine Stand: Base for the engine.
• Cutting Attachment: The working end of the trimmer.
• Primer Bulb: Used to prime the fuel system.
• Shaft Housing: Encases the drive shaft.
• Line Cutting Blade: Located on the cutting attachment shield to trim excess line.
• Cutting Attachment Shield: Protects the user from debris.

ASSEMBLY INSTRUCTIONS

On some units, the D-handle may be preinstalled and only require loosening the screws and adjusting the D-handle to the operator. Proceed to step 4 for adjusting the D-handle if preinstalled.

INSTALLING AND ADJUSTING THE D-HANDLE

1. Remove the screws and bottom clamp piece that were installed on the D-handle for shipping.
2. Place the D-handle over the shaft housing and onto the bottom clamp. Position it a minimum of 6 inches (15.24 cm) from the end of the shaft grip.
3. Start screws with a large Flat-head or T-25 Torx screwdriver. Do not tighten until the handle adjustment is made.
4. If preinstalled, loosen the screws on the D-handle just enough to move it.
5. While holding the unit in the operating position (as if trimming), position the D-handle to the location that provides the best grip.
6. Tighten the clamp screws evenly until the D-handle is secure.

Illustration: A diagram showing the D-handle assembly with labels for Shaft Grip, Screws, Shaft Housing, On/Off Stop Control, Minimum 6 inches (15.24 cm), D-Handle, and Bottom Clamp. Another illustration shows a person holding the trimmer in the operating position, demonstrating proper D-handle placement.

OIL AND FUEL INFORMATION

OIL AND FUEL MIXING INSTRUCTIONS

Old and/or improperly mixed fuel are the main reasons for the unit not running properly. Always use fresh, clean unleaded fuel. Follow the instructions carefully for the proper fuel/oil mixture.

Thoroughly mix the proper ratio of 2-cycle engine oil with unleaded gasoline in a separate fuel can. Use a 32:1 fuel/oil ratio. Do not mix them directly in the engine fuel tank.

Definition of Blended Fuels

Today's fuels are often a blend of gasoline and oxygenates such as ethanol, methanol, or MTBE (ether). Alcohol-blended fuel absorbs water. As little as 1% water in the fuel can make fuel and oil separate, forming acids when stored. When using alcohol-blended fuel, use fresh fuel (less than 60 days old).

Using Blended Fuels

If using a blended fuel, or if its use is unavoidable, follow recommended precautions:

• Always use fresh fuel mix per the operator's manual.
• Always agitate the fuel mix before fueling the unit.
• Drain the tank and run the engine dry before storing the unit.

Using Fuel Additives

The bottle of 2-Cycle Oil that came with the unit contains a fuel additive which helps inhibit corrosion and minimize gum deposits. It is recommended to use only original equipment 2-cycle oil with this unit.

If unavailable, use a good 2-cycle oil designed for air-cooled engines along with a fuel additive, such as STA-BIL® Gas Stabilizer or an equivalent. Add 0.8 oz. (23 ml.) of fuel additive per gallon of fuel according to the instructions on the container. NEVER add fuel additives directly to the unit's fuel tank.

STARTING/STOPPING INSTRUCTIONS

STARTING INSTRUCTIONS

1. Mix gas with oil. Fill fuel tank with fuel/oil mixture. See Oil and Fuel Mixing Instructions.
2. Ensure the On/Off Stop Control is in the ON (I) position.
3. Fully press and release the primer bulb 7 to 9 times, slowly, until FUEL IS VISIBLE IN THE PRIMER BULB. If fuel is not visible, press and release the bulb three (3) additional times, or as many times as it takes until fuel is visible.
4. Push the EZ-Start™ Lever to the left until it clicks and locks into place.
5. With the unit in the starting position, DO NOT SQUEEZE THE THROTTLE CONTROL. Pull the starter rope briskly 5 times with the EZ-Start™ lever pushed to the left. If the engine starts to run before the fifth pull, proceed to step 6.

6. Squeeze the throttle control to warm up the engine for 5 to 10 seconds. The EZ-Start™ Lever will click off automatically.

STOPPING INSTRUCTIONS

1. Release the hand from the throttle control. Allow the engine to cool down by idling.
2. Push and hold the On/Off Stop Control in the OFF (O) position for 3 seconds or until the engine stops running.

Illustration: Diagrams showing the On/Off Stop Control with Start/On (I) and Stop/Off (O) positions, the Primer Bulb and EZ-Start Lever, and a person in the starting position pulling the starter rope while holding the throttle control.

OPERATING INSTRUCTIONS

OPERATING THE EZ-LINK™ SYSTEM

The EZ-Link™ system enables the use of these optional Add-Ons:

• Blower/Vacuum (TBBV)
• Cultivator (TBGC)
• Edger (TBLE)
• Hedge Trimmer (TBHS)
• Snow Thrower (TBST)
• Straight Shaft Trimmer (TBSS)
• Tree Pruner (TBTP)
• Turbo Blower (TBTB)

Removing the Cutting Attachment or Add-Ons:

1. Turn the knob counterclockwise to loosen.
2. Press and hold the release button.
3. While firmly holding the upper shaft housing, pull the cutting attachment or add-on straight out of the EZ-Link™ coupler.

Installing the Cutting Attachment or Add-Ons

1. Turn knob counterclockwise to loosen.
2. While firmly holding the add-on, push it straight into the EZ-Link™ coupler.

3. Turn the knob clockwise to tighten.

For edging when using the line head cutting attachment with EZ-Link™ models, lock the release button of the cutting attachment into the 90° edging hole or the 180° edging hole.

Illustration: Diagrams showing the EZ-Link™ Coupler with Release Button, Primary Hole, Upper Shaft Housing, Lower Shaft Housing, and the knob with 90° Edging Hole and 180° Edging Hole.

OPERATING INSTRUCTIONS

HOLDING THE TRIMMER

Before operating the unit, stand in the operating position. Check for the following:

• The operator is wearing eye protection and proper clothing.
• With a slightly-bent right arm, the operator's hand is holding the shaft grip.
• The operator's left arm is straight, the left hand holding the D-handle.
• The unit is at waist level.
• The cutting attachment is parallel to the ground and easily contacts the grass without the need to bend over.

Illustration: A diagram showing a person holding the trimmer in the correct operating position.

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.

ADJUSTING TRIMMING LINE LENGTH

The Bump Head™ cutting attachment allows line release without stopping the engine. To release more line, lightly tap the cutting attachment on the ground while operating the trimmer at high speed.

Each time the head is bumped, about 1 inch (25.4 mm) of trimming line releases. A blade in the cutting attachment 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 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.

Illustration: A diagram showing the Bump Head™ cutting attachment being tapped on the ground to release line.

TIPS FOR BEST TRIMMING RESULTS

• Keep the cutting attachment parallel to the ground.
• Do not force the cutting attachment. 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 left to right whenever possible. Cutting to the right improves the unit's cutting efficiency. Clippings are thrown away from the operator.
• Slowly move the trimmer 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 and more. Rotate the whole unit so that the cutting attachment is at a 30° angle to the ground.

Illustration: A diagram showing the trimmer held at a 30° angle for decorative trimming.

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.

To assure peak performance, inspection of the engine exhaust port may be necessary after 50 hours of operation. If lost RPM, poor performance, or general lack of acceleration is noticed, this service may be required. If the engine needs 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 oneself as engine damage may result from contaminants involved in the cleaning process for the port.

LINE INSTALLATION FOR THE SPEEDSPOOL®

Always use a genuine original equipment 0.095 inch (2.41 mm) replacement line. Lines other than those specified may make the engine overheat or fail.

There are two methods to replace the SpeedSpool® trimming line:

• Wind the inner reel with new line.
• Install a pre-wound inner reel.

Winding the Inner Reel With New Line

1. Cut two pieces of 0.095 inch (2.41 mm) trimming line, 10 feet (3 m) long.
2. Hold the outer spool and turn the inner reel counterclockwise to line up the arrows on the outer spool and inner reel.
3. Pull old line out of the line loading and line locking holes.
4. Insert a piece of trimming line into one of the two eyelets in the outer spool. Push it up through the line loading hole in the inner reel. Do not bend the line when inserting it into the eyelet.
5. Insert the line into the locking hole. Do not push the line more than a 1/2 inch (12.7 mm) into the line locking hole. The line will form a small loop when it is inserted correctly.
6. Pull the line from the outer spool until the line is tight against the inner reel.
7. Repeat procedures 4-6 with the second piece of line.
8. Hold the outer spool. Wind the inner reel counterclockwise until approximately four (4) inches (102 mm) of line remain.

9. If winding the line becomes difficult or if the line jams, pull the ends of the line from the spool. Continue winding the inner reel counterclockwise.

Illustration: Diagrams showing the SpeedSpool® components (Outer Spool, Inner Reel, Arrows, Bump Knob) and the process of winding line onto the inner reel.

INSTALLING A PRE-WOUND REEL

1. Turn the bump knob counterclockwise and remove the bump knob, spring and foam seal.
2. Pull the old inner reel with existing line from the outer spool.
3. Insert the ends of the prewound inner reel line into the outer spool eyelets. Push the new inner reel, arrow side up, into the outer spool.
4. Hold the inner reel in place and install the bump knob, spring and foam seal. Press down and turn the bump knob clockwise. Grasp the ends and pull firmly to release the line from the holding slots in the inner reel.

Illustration: Diagrams showing the Bump Knob, Foam Seal, Spring, and Inner Reel components, and the process of inserting a pre-wound reel.

Releasing the Inner Reel

If the SpeedSpool® does not release line correctly, pull the ends of the line firmly from the spool. If this does not release the line, follow the Cleaning the SpeedSpool® instructions.

CLEANING THE SPEEDSPOOL®

Cleaning the SpeedSpool® may be necessary if:

• A jammed or excessive line must be removed.
• The SpeedSpool® becomes difficult to wind or does not operate correctly when bumping the head on the ground.

1. Hold the outer spool, and unscrew the bump knob counterclockwise.
2. Pull out the bump knob, spring and foam seal.
3. Pull the inner reel with existing line from the outer spool.
4. Remove any existing line from the inner reel before cleaning. Remove any debris or grass from the knob, spring, inner reel and foam seal. Wash the inner reel with warm soapy water.
5. Clean the shaft and the inner surface of the outer spool. To clean the shaft underneath the plunger, press down on the plunger. Remove any dirt or debris from the shaft.

6. Place the inner reel into the outer spool.
7. Place the bump knob, spring and foam seal into the inner reel.
8. Press the bump knob down and tighten clockwise.
9. Install new line as described in Line Installation for the SpeedSpool®.

Illustration: Diagrams showing the disassembly and cleaning of the SpeedSpool® components.

SPEEDSPOOL® REPLACEMENT PARTS

These SpeedSpool® replacement parts can be purchased from your local authorized dealer.

AIR FILTER MAINTENANCE

Removing the Air Filter/Muffler Cover

1. Remove the four (4) screws securing the air filter/muffler cover. Use a flat blade or T20 Torx bit screwdriver.
2. Pull the cover from the engine. Do not force.

Illustration: A diagram showing the air filter/muffler cover with screws and EZ-Start™ Lever.

Cleaning the Air Filter

Clean and re-oil the air filter every 10 hours of operation. It is an important item to maintain. Failure to maintain the air filter will VOID the warranty.

1. Remove air filter/muffler cover. Refer to Removing the Air Filter/Muffler Cover.
2. Turn cover over and look inside to locate the air filter. Remove the air filter from inside the air filter/muffler cover.
3. Wash the filter in detergent and water. Rinse the filter thoroughly. Squeeze out excess water. Allow it to dry completely.
4. Apply enough clean SAE 30 oil to lightly coat the filter.
5. Squeeze the filter to spread and remove excess oil.
6. Replace the air filter inside the air filter/muffler cover.

Illustration: Diagrams showing the air filter inside the muffler cover, washing the filter, applying oil, and squeezing excess oil.

SPARK ARRESTOR MAINTENANCE

1. Remove the air filter/muffler cover. See Removing the Air Filter/Muffler Cover.
2. Locate the muffler front and the two (2) bolts securing it to the engine. Remove the two (2) bolts using a flatblade screwdriver or 5/16-inch socket or nut driver. Pull the muffler off of the engine.
3. Turn the muffler over to the back side and locate the exhaust gasket. Remove the muffler gasket from the muffler.

4. Using a small flatblade screwdriver, carefully pry up the spark arrestor from the recessed hole. Remove the spark arrestor from muffler.
5. Clean the spark arrestor with a wire brush. Replace it if it is damaged or if it is impossible to clean thoroughly.
6. Reinstall the spark arrestor by pressing it into the recessed hole on the muffler's back side. Make sure it fits tightly against the muffler and is not raised up.
7. Place the exhaust gasket against the muffler's back side. Align the exhaust gasket bolt holes with the bolt holes in the muffler. While holding the exhaust gasket in place, insert bolts into muffler's front side.
8. Place the muffler (with the exhaust gasket in place and the bolts inserted) against the engine, aligning the bolt holes. Tighten the bolts to secure the muffler to the engine.

If using a torque wrench, torque to: 80-90 in. lb. (9-10.2 N•m).

9. Reinstall air filter/muffler cover.

Illustration: Diagrams showing the muffler components (Bolts, Spark Arrestor, Exhaust Gasket, Muffler - Front Side, Muffler - Back Side) and the process of removing the spark arrestor with a flatblade screwdriver.

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable through the air filter/muffler cover.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason for improper unit performance. Drain and refill the tank with fresh, properly-mixed fuel prior to making any adjustments. Refer to Oil and Fuel Information.

Clean Air Filter

The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air flow and change the air/fuel mixture. This is often mistaken for an out of adjustment carburetor. Check the condition of the air filter before adjusting the idle speed screw. Refer to Air Filter Maintenance.

Adjust Idle Speed Screw

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 let it run at a high idle for a 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 or flat blade screwdriver into the hole in the air filter/muffler cover. Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.

3. If the cutting attachment rotates when the engine idles, 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.

Illustration: A diagram showing the location of the Idle Speed Screw on the carburetor.

MAINTENANCE AND REPAIR INSTRUCTIONS

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug (or equivalent). The correct air gap is 0.020 inch (0.5 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 in. socket counterclockwise.
3. Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.020 in. (0.5 mm) using a feeler gauge.

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.

Illustration: A diagram of a Champion spark plug with a 0.020 in. (0.5 mm) gap indicated.

LONG TERM STORAGE

If the unit will be stored 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 60 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 1 oz. (30 ml) 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.

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.

TRANSPORTING

• Allow the engine to cool before transporting.
• Drain fuel from unit.
• Tighten fuel cap before transporting.
• Secure the unit while transporting.

ACCESSORIES/REPLACEMENT PARTS

These replacement parts can be purchased from a local authorized dealer.

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 the unit with fuel in the tank 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.

TROUBLESHOOTING

If further assistance is required, contact an authorized service dealer.

SPECIFICATIONS

ENGINE

DRIVE SHAFT and CUTTING ATTACHMENT

EPA Emission Control Warranty Statement

Your Warranty Rights and Obligations

The Environmental Protection Agency and MTD SOUTHWEST INC (MTD) explain the emission control system warranty on 2002 and later small off-road engines. New small off-road engines must be designed, built and equipped to meet stringent anti-smog standards. MTD warrants the emission control system on small off-road engines for the periods of time listed below, provided there has been no abuse, neglect or improper maintenance.

The emission control system may include parts such as the carburetor or fuel-injected system, the ignition system, and catalytic converter. Also included may be hoses, belts, connectors and other emission-related assemblies.

Where a warrantable condition exists, MTD will repair small off-road engines at no cost, including diagnosis, parts and labor.

The 2002 and later small off-road engines are warranted for two years. If any emission-related part on the engine is defective, the part will be repaired or replaced by MTD.

Owners Warranty Responsibilities

• As the small off-road engine owner, users are responsible for the performance of the required maintenance listed in the operator's manual. MTD recommends retaining all receipts covering maintenance, but MTD cannot deny warranty solely for the lack of receipts or for failure to ensure the performance of all scheduled maintenance.
• Users should be aware that MTD may deny warranty coverage if the small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.
• Users are responsible for presenting the small off-road engine to an MTD Authorized Service Center as soon as a problem exists. Warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.

For questions regarding warranty rights and responsibilities, call 1-800-345-8746.

Manufacturer's Warranty Coverage

• The warranty period begins on the date the engine or equipment is delivered to the retail purchaser.
• The manufacturer warrants to the initial owner and each subsequent purchaser that the engine is free from defects in material and workmanship which cause the failure of a warranted part for a period of two years.
• Repair or replacement of warranted parts will be performed at no charge to the owner at an Authorized MTD Service Center. For the nearest location, contact MTD at: 1-800-345-8746.
• Any warranted part not scheduled for replacement, or scheduled for regular inspection with
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