yard-man YM26BC PARTS LIST

Operator’s Manual

English

4-Cycle Trimmer /

Brushcutter

Model

YM26BC

IMPORTANT: Read safety rules and instructions carefully before operating equipment.

PRINTED IN U.S.A.
PART NO. 769-00576	(12/02)

TABLE OF CONTENTS

Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page

Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Know Your Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Maintenance and Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inside Back Cover

FINDING MODEL NUMBER

This Operator’s Manual is an important part of your new trimmer. It will help you assemble, prepare and maintain the unit for best performance. Please read and understand what it says.

Before you start assembling your new equipment, please locate the model plate on the unit and copy the information from it onto the space provided below. The information on the model plate is very important if you need help from our Customer Support Department or an authorized dealer.

•You can locate the model number by looking on the engine. A sample model plate is shown and explained below. For future reference, please copy the model number and the serial number of the equipment in the space provided.

	MODEL :
S/N :	ITEM :

Copy the model and parent part number here:

Copy the serial number here:

CALLING CUSTOMER SUPPORT

If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of this unit, please call the Customer Support Department.

Call 1- (800)-345-8746, or 1- (800)-668-1238 in Canada, to reach a Customer Support representative. Please have your unit’s model number and serial number ready when you call. You will be asked to enter the serial number in order to process your call. This information is explained above.

VISIT OUR WEB SITE

Visit our web site at www.yardman.com for more information about our quality Yard Man products, customer service, parts, tips, literature and more.

2

SPARK ARRESTOR

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. Check with your state or local authorities for regulations pertaining to these requirements. Failure to follow these requirements could subject you to liability or a fine. This unit is factory equipped with a spark arrestor. If it requires replacement, ask your LOCAL SERVICE DEALER to install the accessory part #180890 Spark Arrestor.

WARNING!

Read the Operator’s Manual and follow all warnings and safety instructions. Failure to do so can result in serious injury to the operator and/or bystanders.

FOR QUESTIONS, CALL 1-800-345-8746 IN U.S. OR 1-800-668-1238 in CANADA

SECTION 1: IMPORTANT SAFE OPERATION PRACTICES

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

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

NOTE: Advises you of information or instructions vital to the operation or maintenance of the equipment.

DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

WARNING: Failure to obey a safety warning can result in injury to yourself and others. Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

CAUTION: Failure to obey a safety warning may result in property damage or personal injury to yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

SECTION 1a: RULES FOR SAFE OPERATION

California Proposition 65 Warning:

WARNING

THE ENGINE EXHAUST FROM THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.

READ ALL INSTRUCTIONS

WARNING: When using the unit, you must follow the safety rules. For your own safety and that of bystanders, please read these instructions before operating the unit. Please keep the instructions for later use.

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.

3

•Children under the age of 15 must not use the unit; teens may operate the unit with adult guidance.

•Inspect the unit before use. Replace damaged parts. Check for fuel leaks. Make sure all fasteners are in place and secure. Replace cutting attachment parts that are cracked, chipped or damaged in any way. Make sure the cutting attachment is properly installed and securely fastened. Be sure that 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 Factory Parts™ replacement line. Never use metalreinforced line, wire, chain or rope. These can break off and become dangerous projectiles.

•Be aware of risk of injury to the head, hands and feet.

•Clear the area to be cut before each use. Remove rocks, broken glass, nails, wire, string and other objects which may be thrown or become entangled in the cutting attachment. Clear the area of children, bystanders and pets; keep them outside a 50-foot (15 m.) radius, at a minimum. Even then, they are still at risk from thrown objects. Encourage bystanders to wear eye protection. If you are approached, stop the unit immediately.

•Squeeze the throttle control and check that it returns automatically to the idle position. Make all adjustments or repairs before using the unit.

Safety Warnings for Gas Trimmers

WARNING: Gasoline is highly flammable, and its vapors can explode if ignited. Take the following precautions:

•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 fuel tank cap 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 outdoor area where there are no sparks or flames. Remove the fuel cap slowly, and only after the engine stops. 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 be fatal. Operate this unit only in a well-ventilated outdoor area.

•Wear safety glasses or goggles that meet ANSI Z87.1 standards and are marked as such. Wear ear/hearing protection when operating this unit. Wear a face or dust mask if the operation is dusty.

•Wear heavy long pants, boots, gloves and a long sleeve shirt. 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 J-handle to your size in order 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. Remain in the starting position whenever pulling the starter rope. The operator and unit must be in a stable position while starting. Refer to Starting/Stopping Instructions.

•Use the right tool. Only use this tool for its intended purpose.

•Do not overreach. Always keep proper footing and balance.

•Always hold the unit with both hands when operating. Keep a firm grip on both handles 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 rotates.

•Do not touch the engine, gear housing or muffler. These parts get extremely hot from operation, even after the unit is turned off.

•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 you strike or become entangled with a foreign object, 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 the unit, switch the engine to off, and disconnect the spark plug for maintenance or repair.

•Use only Genuine Factory Parts™ replacement parts and accessories for this unit. These are available from your authorized service dealer. Use of any unauthorized parts or accessories could lead to serious injury to the user, damage to the unit, and a voided warranty.

•Keep unit clean of vegetation and other materials. They may become lodged between the cutting attachment and shield.

4

•To reduce fire hazard, replace a faulty muffler and spark arrestor. Keep the engine and muffler free from grass, leaves, excessive grease or carbon build up.

While Operating with the Cutting Blade

•Read and understand all safety warnings before operating this unit.

•Always use the shoulder harness when using the brush blade accessory.

•Keep the J-handle between the operator and cutting attachment or blade at all times.

•NEVER cut with the cutting blade located over 30 inches (76 cm) or more above the ground level.

•Blade thrust may occur when the spinning blade contacts an object that it does not immediately cut. Blade thrust can be violent enough to cause the unit and/or operator to be propelled in any direction , and possibly lose control of the unit. Blade thrust can occur without warning if the blade snags, stalls or binds. This is more likely to occur in areas where it is difficult to see the material being cut.

•For operation with the brush blade, do not cut anything thicker than 1/2 inch or a violent kickback could occur.

•Do not attempt to touch or stop the blade when it is rotating.

•A coasting blade can cause injury while it continues to spin after the engine is stopped or the throttle trigger is released. Maintain proper control until the blade has completely stopped rotating.

•Do not run the unit at high speed when not cutting.

•If you strike or become entangled with a foreign object, stop the engine immediately and check for damage. Have any damage repaired before attempting further operations. Do not operate unit with a bent, cracked or dull blade. Discard blades that are bent, warped, cracked or broken.

•Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury. Replace the blade.

•Do not use the cutting blade for edging or as an edger, severe personal injury to yourself or others can occur. Use the cutting blade only for the purpose as described in this manual.

•Stop the engine IMMEDIATELY if you feel excessive vibration. Vibration is a sign of trouble. Inspect thoroughly for loose nuts, bolts or damage before continuing. Repair or replace affected parts as necessary.

After Use

•Clean cutting blades with a household cleaner to remove any gum buildup. Oil the blade with machine oil to prevent rust.

•Lock up and store the cutting blade in an appropriate area to protect the blade from unauthorized use or damage.

Other Safety Warnings

•Never store a fueled unit inside a building where fumes may reach an open flame or spark.

•Allow the engine to cool before storing or transporting. Be sure to 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 Cleaning and Storage instructions.

•Keep these instructions. Refer to them often and use them to instruct other users. If you loan someone this unit, also loan them these instructions.

SAVE THESE INSTRUCTIONS

5

SECTION 1b:SAFETY & INTERNATIONAL SYMBOLS

This operator's manual describes safety and international symbols and pictographs that may appear on this product. Read the operator's manual for complete safety, assembly, operating and maintenance and repair information.

SYMBOL	MEANING	SYMBOL	MEANING
	• SAFETY ALERT SYMBOL		• ON/OFF STOP CONTROL
	Indicates danger, warning or caution.		OFF or STOP
	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

WARNING: Thrown objects and loud noise can cause severe eye injury and hearing loss. Wear eye protection meeting ANSI Z87.1 standards and ear protection when operating this unit.

Use a full face shield when needed.

•KEEP BYSTANDERS AWAY

WARNING: 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.

• ON/OFF STOP CONTROL

ON / START / RUN

• PRIMER BULB

Push primer bulb, fully and slowly, 10 times.

•THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY

WARNING: Do not operate without the cutting attachment shield in place. Keep away from the rotating cutting attachment.

• HOT SURFACE WARNING

Do not touch a hot muffler, gear housing or cylinder. You may get burned. These parts get extremely hot from operation.

They remain hot for a short time after the unit is turned off.

• SHARP BLADE

WARNING: Sharp blade on cutting attachment shield. To prevent serious injury, do not touch line cutting blade.

•BRUSHCUTTERS • REPLACE DULL BLADE

Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury.

•TRIMMER/BRUSHCUTTER SAFETY

WARNING: Thrown objects and rotating cutter can cause severe injury. Keep bystanders, especially children and pets, at least 50 feet (15 m) away from the cutting area. The cutting attachment shield must be used when using the trimmer cutting attachment.

• CHOKE CONTROL

A • FULL choke position

B • PARTIAL choke position C • RUN position

6

SECTION 2: KNOW YOUR UNIT

Applications

As a trimmer:

•Cutting grass and light weeds

•Edging

•Decorative trimming around trees, fences, etc. As a brushcutter:

•Cutting weeds and light bush of up to 1/2 inch in diameter

Other optional accessories may be used with the YM26BC. Refer to Operating the EZ-Link System for a list of add-ons.

Spark Arrestor

Spark Plug

Muffler

Muffler Guard

Fuel Cap

Starter Rope Grip

Shaft Grip

Throttle

Lock-Out

On/Off Stop Control

Throttle

Control

Shoulder Strap Clip

J-Handle

EZ-Link™

Blade Shield /

Shield Mount

Shaft	Choke Lever
	Spark Plug
Housing	Air Filter Cover

Primer Bulb

Brush

Blade Cutting Attachment

Shield

Gear

Housing

Engine Feet

Oil Fill Plug / Dipstick

Cutting Attachment

Line Cutting Blade

7

SECTION 3: ASSEMBLY INSTRUCTIONS

On some units, the J-handle may be pre-installed. Go to step 5 if the J-handle is pre-installed.

Install and Adjust the J-handle

1.Place the J-handle between the top and middle clamp pieces. See Figure 1.

(4) Screws

J-Handle

Top Clamp

Middle Clamp

Bottom Clamp

Nuts

Figure 1

2.While holding the three pieces together, install the four

(4) screws through the top clamp and into middle clamp.

NOTE: The holes in the top and middle clamp will line up only when assembled correctly.

3.Place the clamps and the J-handle over the shaft housing and onto the bottom clamp.

4.Hold each hex nut in the bottom clamp recess with a finger. Start screws with a large Phillips screwdriver. Do not tighten until you make the handle adjustment.

5.Slide the J-handle in or out until the arrow/white line on the

decal touches the clamp	must first loosen
the screws if the handle	Figure 2.
Decal

Figure 2

6.While holding the unit in the operating position, position the J-handle to the location that provides you the best grip. See Figure 3.

Install the Harness

WARNING: Always use the shoulder harness when using the cutting blade to avoid serious personal injury.

1.Push the strap through the center of the buckle.

2.Pull the strap over the cross bar and down through the slot in the buckle. See Figure 4.

3.Put the harness on over head and onto shoulder. Snap it on to the support fitting. See Figure 5.

4.Adjust length to fit the operator’s size. Pull tab to lengthen, pull strap to shorten. See Figure 6.

Figure 4

Support Fitting

Figure 5

Figure 6

Figure 3

7.Tighten the clamp screws evenly, until the J-handle is secure.

Remove and Install the Cutting Attachment

Shield

Remove the cutting attachment shield when using the unit as a brushcutter

WARNING: The cutting attachment shield should NOT be installed when operating the unit with a blade. Remove the cutting attachment shield before removing or installing the blade.

Remove the cutting attachment shield from the shield mount by removing the three (3) screws with a flat blade screwdriver. See Figure 7. Store parts for future use.

8

SECTION 3: ASSEMBLY INSTRUCTIONS

Cutting	(3) Screws
Attachment
Shield

Gear Housing

Shield Mount
Figure 7
Install the cutting attachment shield when	the unit
as a grass trimmer

WARNING: To avoid serious personal injury, the cutting attachment shield MUST be in place at all times while operating the unit as a grass trimmer.

Install the cutting attachment shield on the shield mount by inserting the three (3) screws into the shield mount. Tighten securely with a flat blade screwdriver. See Figure 7.

Remove the Cutting Attachment & Install

the Cutting Blade

NOTE: To make cutting blade removal and installation easier, place the unit on the ground or on a work bench.

Remove the Cutting Attachment Shield

See Remove and Install the Cutting Attachment Shield.

WARNING: The gear housing gets hot with use. It can result in injury to the operator. The housing remains hot for a short time even after the unit is turned off. Do not touch the gear housing until it has cooled.

Remove the Cutting Attachment

1.Align the shaft bushing hole with the locking rod slot and insert the locking rod into the shaft bushing hole. See Figure 8.

Output Shaft

Shaft Bushing Hole

Locking Rod Slot

Output Shaft

Bushing

Locking Rod

Figure 8

2.Hold the locking rod in place by grasping it next to the boom of the unit. See Figure 9.

3.While holding the locking rod, remove the cutting attachment by turning it clockwise off of the output shaft. See Figure 10. Store the cutting attachment for future use.

NOTE: The blade retainer under the cutting attachment will be used when installing the cutting blade.

Figure 9

Cutting Attachment

Locking Rod

Slot

Locking Rod

Figure 10

Install the Cutting Blade

WARNING: To avoid serious personal injury, always wear gloves while handling or installing the blade.

4.Place the cutting blade on the output shaft bushing. See Figure 11.

Blade Retainer

Nut

Cutting

Blade

Shield

Mount

Pilot Hole

Output Shaft

Bushing

Locking Rod

Figure 11

9

SECTION 3: ASSEMBLY INSTRUCTIONS

5.Make sure that the cutting blade is centered on the pilot step and sitting flat against the output shaft bushing. See Figure 12.

WARNING: If the cutting blade is offcenter, the unit will vibrate and the blade may fly off, causing possible serious personal injury.

Pilot Step

Remove the Cutting Blade & Install the Cutting Attachment

WARNING: To avoid serious personal injury, always wear gloves while handling or installing the blade.

Remove the Cutting Blade

1.Align the shaft bushing hole with the locking rod slot and insert the locking rod into the bushing hole. See Figure 8.

2.Hold the locking rod in place by grasping it next to the boom of the unit. See Figure 14.

3.While holding the locking rod, loosen the nut on the blade by turning it clockwise with a 5/8 inch closedend or socket wrench. See Figure 14.

Figure 12

6.Align the shaft bushing hole with the locking rod slot and insert the locking rod into the bushing hole. See Figure 8.

7.Put the blade retainer and nut on the output shaft. Make sure that the blade is installed correctly.

8.Tighten nut counterclockwise against the blade while holding the locking rod:

•If using a torque wrench and an 5/8 inch socket tighten to: 325 - 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.

•Without a torque wrench, use a 5/8 inch closed-end or socket wrench, turning the nut until the blade retainer is snug against the shaft bushing. Make sure that the blade is installed correctly, then rotate the nut an additional 1/4 to 1/2 turn counterclockwise. See Figure 13.

1/4-1/2 turn Counterclockwise

Figure 13

9. Remove the locking rod from the locking rod slot.

WARNING: To avoid serious personal injury or damage to the unit, do not start or operate this unit with the locking rod in the locking rod slot.

WARNING: Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury. Replace the blade.

Clockwise

Figure 14

4.Remove the nut, blade retainer and blade. Store the nut and blade together for future use in a secure place. Store out of children’s reach.

Install the Cutting Attachment

5.Align the shaft bushing hole with the locking rod slot and insert the locking rod into the shaft bushing hole. See Figure 8. Place the blade retainer on the output shaft with the flat surface against the output shaft bushing. See Figure 15. Screw the cutting attachment counterclockwise onto the output shaft. Tighten securely.

NOTE: The blade retainer must be installed on the output shaft in the position shown for the cutting attachment to work correctly.

Cutting Attachment

Blade Retainer

Output Shaft

Bushing

Locking Rod

Figure 15

6.Remove the locking rod.

7.Install the cutting attachment shield. Refer to Remove and Install the Cutting Attachment Shield.

WARNING: To avoid serious personal injury, the cutting head guard MUST be in place at all times while operating the unit as a trimmer.

10

SECTION 4: OIL AND FUEL INFORMATION

DANGER: OVERFILLING OIL CRANKCASE MAY CAUSE SERIOUS PERSONAL INJURY. Check and maintain the proper oil level in the crank case; it is important and cannot be overemphasized. Check the oil before each use and change it as needed. See

Changing the Oil.

Recommended Oil Type

Using the proper type and weight of oil in the crankcase is extremely important. Check the oil before each use and change the oil regularly. Failure to use the correct oil, or using dirty oil, can cause premature engine wear and failure.

Use a high-quality SAE 30 weight oil of API (American Petroleum Institute) service class SF, SG, SH.

2.Place the unit on a flat level surface.

3.Remove the oil plug / dipstick from the crankcase. See Figure 17.

O-Ring

Oil Fill Plug/Dipstick

Oil Fill Hole

Adding Oil to Crankcase: Initial Use

NOTE: This unit is shipped without oil. In order to avoid damage to the unit, put oil in the crankcase before you attempt to start the unit.

Your unit is supplied with one 3.4 fluid oz. (100 ml.) bottle of SAE 30 SF, SG, SH oil. See Figure 16.

NOTE: Save the bottle of oil. It can be used to measure the correct amount during future oil changes. See Changing the Oil.

1.Unscrew the top of the bottle of oil and remove the paper seal covering the opening. Replace the top. Next, cut the tip off the funnel spout. See Figure 16.

Funnel Spout

Figure 16

Figure 17

4.Pour the entire bottle of oil into the oil fill hole. See Figure 18.

Oil Fill

Figure 18

NOTE: Never add oil to the fuel or fuel tank.

5.Wipe up any oil that may have spilled and reinstall the oil fill plug / dipstick.

Check oil before each use and change as needed. Refer to Changing the Oil.

11

SECTION 4: OIL AND FUEL INFORMATION

Recommended Fuel Type

Old fuel is the primary reason for improper unit performance. Be sure to use fresh, clean, unleaded gasoline.

NOTE: This is a four cycle engine. In order to avoid damage to the unit, do not mix oil with gasoline.

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 or form acids when stored. Use fresh fuel (less than 60 days old), when using alcohol-blended fuel.

Using Blended Fuels

If you choose to use a blended unavoidable, follow recommended

•Always use fresh unleaded

•Use the fuel additive STA-

•Drain tank and run the

Using Fuel Additives

The use of fuel additives, such as STA-BIL® Gas Stabilizer or an equivalent, will inhibit corrosion and minimize the formation of gum deposits. Using a fuel additive can keep fuel from forming harmful deposits in the carburetor for up to six (6) months. 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 gas tank.

Fueling The Unit

WARNING: Gasoline is extremely flammable and its vapors can explode if ignited. To avoid serious personal injury, always stop the engine and allow it to cool before filling the fuel tank. Do not smoke while filling the tank. Keep sparks and open flames away from the area.

1. Remove the fuel cap.

WARNING: Remove the fuel cap slowly to avoid injury from gasoline spray.

Unleaded

Gasoline

Gas

	Fuel Tank
	Figure 19
2.	container’s spout into the fill hole on
the	fill the tank. See Figure 19.

WARNING: Add gasoline in a clean, wellventilated outdoor area. Avoid creating a source of ignition for spilt fuel.

NOTE: Do not overfill the tank.

3.Wipe up any gasoline that may have spilled.

4.Reinstall the fuel cap.

WARNING: Never operate the unit without the fuel cap securely in place.

5.Move the unit at least 30 ft. (9.1 m) from the fueling source and site before starting the engine.

NOTE: Dispose of the old gasoline in accordance to Federal, State and Local regulations.

12

SECTION 5: STARTING/STOPPING INSTRUCTIONS

Starting Instructions

Cold Start: The Day’s First Start or Engine Ran Out of Gas

WARNING: Operate this unit only in a wellventilated outdoor area. Carbon monoxide exhaust fumes can be lethal in a confined area.

1.Check oil level in crankcase. See Checking the Oil Level.

2.Fill the fuel tank with fresh, clean, unleaded gasoline. See Fueling the Unit.

3.Put the Start/Stop Engine Control in the START [I] position. See Figure 20.

Stop/Off (O)

Start/On (I)

Throttle Lock-Out

Throttle Control

Figure 20

4.Place the choke lever in the FULL choke (A) position. See Figure 21.

NOTE: Slide the choke lever directly above the appropriate symbol on filter cover decal. See Figure 21.

5.Fully press and release the primer bulb slowly 10 times until FUEL IS VISIBLE IN THE PRIMER BULB. If you can’t see fuel in the bulb, press and release the bulb as many times as it takes before you can see fuel in it. See Figure 21.

Choke Lever

Primer Bulb

Figure 21

6.Squeeze the throttle control to the wide open (full throttle) position and squeeze the throttle lock-out.

7.With the unit in the starting position and the choke in

the FULL (A) position, pull the starter rope briskly 5 times. If the engine attempts to run before the fifth pull, proceed to step 8.

8.Move the choke lever to the PARTIAL (B) position. See Figure 21.

NOTE: The engine will not run in the FULL choke (A) position.

9.Pull the starter rope 1 to 3 pulls until the engine starts. Run for 15-30 seconds. If the unit fails to start, return to step 4.

10.Move the choke lever to the RUN (C) position and run at full throttle for 30 seconds.

WARNING: Avoid accidental starting. Make sure you are in the starting position when pulling the starter rope. See Figure 22. To avoid serious injury, the operator and unit must be in a stable position while starting.

Starter Rope

Throttle Control

Figure 22

11.Release the throttle control to the idle position and begin operation.

NOTE: If the engine does not start using these procedures, repeat steps 4 through 11 using TWO (2) pulls in the FULL choke (A) position.

Engine Re-Start: Warm Engine With Fuel

1.Put the Start/Stop Engine Control in the START [I] position. See Figure 20.

2.Move the choke lever to the PARTIAL (B) position. See Figure 21.

3.Fully press and release the primer bulb slowly 10 times until FUEL IS VISIBLE IN THE PRIMER BULB. If you can’t see fuel in the bulb, press and release the bulb as many times as it takes before you can see fuel in it. See Figure 21.

4.Squeeze the throttle control to the wide open (full throttle) position.

5.With the unit in the starting position, pull the starter rope briskly until the engine starts. See Figure 22.

6.When the engine starts, move the choke lever to the RUN (C) position, and run at full throttle for 30 seconds.

NOTE: If the engine does not start using the Engine Re-start procedures, revert to the Cold Start procedures.

Stopping Instructions

1.Release your hand from the throttle control. See Figure 22. Allow the engine to cool down by idling.

2.Put the On/Off Stop Control in the OFF (O) position. See Figure 20.

13

SECTION 6: OPERATING INSTRUCTIONS

Operating the EZ-Link™ System

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

Blower/Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . BV720r Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720r Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720r Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . HS720r Snow Thrower . . . . . . . . . . . . . . . . . . . . . . . . . . . ST720r Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . SS725r Tree Pruner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TP720r Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720r

WARNING: Read and understand the operator’s manual for each add-on prior to operation.

Removing the Cutting Attachment or Add-Ons

1.Turn the knob counterclockwise to loosen. See Figure 23.

2.Press and hold the release button. See Figure 23.

3.While firmly holding the upper shaft housing, pull the cutting attachment or add-on straight out of the EZ-Link™ coupler. See Figure 24.

Installing the Cutting Attachment or Add-On

WARNING: To avoid serious personal injury and damage to the unit, shut off the unit before removing or installing add-ons.

NOTE: Place the unit on the ground or on a work bench to make add-on installation or removal easier.

1. Turn knob counterclockwise to loosen.

EZ-Link™ Coupler	Release Button

Knob

Guide Recess

Figure 23

2.While firmly holding the add-on, push it straight into the EZ-Link™ coupler. See Figure 24.

NOTE: Aligning the release button with the guide recess will help installation. See Figure 23.

Release Button

EZ-Link™ Coupler

Primary Hole

Upper Shaft Housing

Lower Shaft Housing

Figure 24

3. Turn the knob clockwise to tighten. See Figure 25.

CAUTION: Lock the release button in the primary hole and securely tighten the knob before operating this unit

90˚ Edging Hole

(Trimmer Only)

180˚ Edging Hole

(Trimmer Only)

Knob

Figure 25

CAUTION: The cutting attachment and addons with the EZ-Link™ system are to be used in the primary hole unless stated otherwise in the specific add-ons operator’s manual.

Using the wrong hole could lead to personal injury or damage to the unit.

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. See Figure 25.

14

SECTION 6: OPERATING INSTRUCTIONS

Holding the Trimmer

WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.

Before operating the unit, stand in the operating position. See Figure 26. Check for the following:

•The operator is wearing eye protection and proper clothing

•With a slightly-bent right arm, the operator’s right hand is holding the shaft grip

•The operator’s left arm is straight, the left hand holding the J-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

Once you are in the operating position, hook the shoulder strap to the unit.

Figure 26

Adjusting Trimming Line Length

The Bump Head™ cutting attachment allows you to release trimming line without stopping the engine. To release more line, lightly tap the cutting attachment on the ground while operating the trimmer at high speed. See Figure 27.

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 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 you attempt 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 knob on the ground while the unit is running.

CAUTION: Do not remove or alter the line cutting blade assembly. Excessive line length may make the unit overheat.

Some line breakage will occur from:

•Entanglement with foreign matter

•Normal line fatigue

•An attempt to cut thick, stalky weeds

•Forcing the line into objects such as walls or fence posts

Tips for Best Trimming Results

•For best trimming results, operate unit at full throttle.

•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) tall 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- to-backward or side-to-side motion. Cutting shorter lengths produces the best results.

•Trim only when grass and weeds are dry.

•The life of your 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.

Figure 27

15

SECTION 6: OPERATING INSTRUCTIONS

Decorative Trimming

Decorative trimming refers to the removal of vegetation around trees, posts, fences and more.

Rotate the whole unit so that the cutting attachment is at a 30° angle to the ground. See Figure 28.

Figure 28

Using the Cutting Blade

WARNING: Always wear eye, hearing, foot, body protection and the shoulder strap to reduce the risk of injury when operating this unit.

WARNING: Do not use the cutting blade for edging or as an edger. Severe personal injury to yourself or others can result.

Before operating the unit with the cutting blade, stand in the operating position. See Figure 29. Refer to Holding the Trimmer.

WARNING: The blade continues to spin after the engine is turned off. The coasting blade can seriously cut you if accidentally touched.

•Swing the unit in the opposite direction as the blade spins, which increases the cutting action.

•After the return swing, move forward to the next area to be cut plant your feet again.

•The cutting blade is designed with a second cutting edge. You can use it by removing the blade, turning it upside down, and reinstalling it.

WARNING: Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury to yourself or others. Replace the blade.

To reduce the chance of material wrapping around the blade, follow these steps:

•Cut at full throttle

•Swing the unit into material to be cut from your left to your right, see Figure 30

•Avoid the material just cut as you make the return swing

WARNING: Do not clear away any cut material with the engine running or blade turning. To avoid serious personal injury, turn off the engine. Allow the blade to stop before removing materials wrapped around the blade shaft.

Cutting Blade Operating Tips

To establish a rhythmic cutting procedure:

•Plant feet firmly, comfortably apart.

•Bring the engine to full throttle before entering the material to be cut. At full throttle the blade has maximum cutting power and is less likely to bind, stall or cause blade thrust (which can result in serious personal injury to the operator or others).

WARNING: Blade thrust may occur when the spinning blade contacts an object that it does not immediately cut. Blade thrust can be violent enough to cause the unit and/or operator to be propelled in any direction, and possibly lose control of the unit. Blade thrust can occur without warning if the blade snags, stalls or binds. This is more likely to occur in areas where it is difficult to see the material being cut.

•Cut while swinging the upper part of your body from left to right.

•Always release the throttle trigger and allow the engine to return to idle speed when not cutting.

•When you are finished, always unsnap the unit from the harness before taking off the harness.

Figure 29

Figure 30

16

SECTION 7: 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.

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	REFER TO
	Before starting engine	Fill fuel tank with fresh fuel	Page 12
		Check oil	Page 19
	Every 10 hours	Clean and re-oil air filter	Page 21
	First change at 10 hours	Change oil	Page 20
	Every 25 hours thereafter	Change oil	Page 20
	Every 25 hours	Clean spark arrestor	Page 24
	10 hours on new engine	Check rocker arm to valve clearance and adjust	Page 23
	Every 25 hours	Check rocker arm to valve clearance and adjust	Page 23
	Every 25 hours	Check spark plug condition and gap	Page 24

Line Installation

This section covers both SplitLine™ and standard single line installation.

Always use Genuine Factory Parts™ 0.095 in. (2.41 mm) replacement line. Using line other than the specified may make the engine overheat or fail.

WARNING: Never use metal-reinforced line, wire, chain or rope. 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

Winding the Existing Inner Reel

1. and unscrew the Inspect moves

Outer Spool

Spring

Inner Reel

Bolt

Bump Knob

Figure 31

2.Remove the inner reel from the outer spool. See Figure 31.

3.Remove spring from the inner reel. See Figure 31.

4.Use a clean cloth to wipe the inner reel, spring, shaft, and inner surface of the outer spool. See Figure 32.

5.Check the indexing teeth on the inner reel and outer spool for wear. If necessary, remove burrs or replace the reel and spool. See Figure 33.

Figure 32

Indexing Teeth

Figure 33

17

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

For Use with Single	For Use with SplitLine™
Line ONLY	or Single Line
	Slotted
	Holes

Figure 34

NOTE: SplitLine™ can only be used with the inner reel with the slotted holes. Single line can be used on either type of inner reel. Use Figure 34 to identify the inner reel you have.

NOTE: Always use the correct line length when installing trimming line on the unit. The line may not release properly if the line is too long.

Loop

Figure 35

Single Line Installation

Go To Step 8 for SplitLine™ Installation

6.Take approximately 40 feet (12.2 m) of new trimming line, loop it into two equal lengths. Insert each end of the line through one of the two holes in the inner reel. See Figure 35. Pull the line through the inner reel so that the loop is as small as possible.

7.Wind the lines in tight even layers, onto the reel. See Figure 36. Wind the line in the direction indicated on the inner reel. Place your index finger between the two lines to stop the lines from overlapping. Do not overlap the ends of the line. Proceed to step 11.

Figure 36

SplitLine™ Installation

8.Take approximately 20 feet (6.1 m) of new trimming line. Insert one end of the line through one of the two holes in the inner reel. See Figure 37. Pull the line through the inner reel until only about 4 inches is left out.

9.Insert the end of the line into the open hole in the inner reel and pull the line tight to make the loop as small as possible. See Figure 37.

10.Before winding, split the line back about 6 inches.

11.Wind the line in tight even layers in the direction indicated on the inner reel.

NOTE: Failure to wind the line in the direction indicated will cause the cutting attachment to operate incorrectly.

Loop

Figure 37

12.Insert the ends of the line into the two holding slots. See Figure 38.

13.Insert the ends of the line through the eyelets in the outer spool and place inner reel with spring inside the outer spool. See Figure 39. Push the inner reel and outer spool together. While holding the inner reel and outer spool, grasp the ends and pull firmly to release the line from the holding slots in the reel.

Holding Slots

Figure 38

NOTE: The spring must be assembled on the inner reel before reassembling the cutting attachment.

14.Hold the inner reel in place and install the bump knob by turning counterclockwise. Tighten securely.

Spring

Figure 39

18

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Installing a Prewound Reel

1.Hold the outer spool with one hand and unscrew the bump knob clockwise. See Figure 31. Inspect the bolt inside the bump knob to make sure it moves freely. Replace the bump knob if damaged.

2.Remove the old inner reel from the outer spool. See Figure 31.

3.Remove the spring from the old inner reel. See Figure 31.

4.Place the spring in the new inner reel.

NOTE: The spring must be assembled on the inner reel before reassembling the cutting attachment.

5.Insert the ends of the line through the eyelets in the outer spool. See Figure 39.

6.Place the new inner reel inside the outer spool. Push the inner reel and outer spool together. While holding the inner reel and outer spool, grasp the ends and pull firmly to release the line from the holding slots in the spool.

7.Hold the inner reel in place and install the bump knob by turning counterclockwise. Tighten securely.

Replacement Parts

See Accessories / Replacement Parts.

Checking The Oil Level

CAUTION: To prevent extensive engine wear and damage to the unit, always maintain the proper oil level in the crankcase. Never operate the unit with the oil level below the bottom of the dipstick.

The importance of checking and maintaining the proper oil level in the crankcase cannot be overemphasized. Check oil before each use:

1.Stop the engine and allow oil to drain into the crankcase.

2.Place the unit on a flat, level surface to get a proper oil level reading.

3.Keep dirt, grass clippings and other debris out of the engine. Clean the area around the oil fill plug/dipstick before removing it.

4.Remove the oil fill plug/dipstick and wipe off oil. Reinsert it all the way back in.

5.Remove the oil fill plug/dipstick and check the oil level. Oil should be up to the top of the dipstick. See Figure 40.

Oil Fill Plug/Dipstick

O-Ring

Full

Add 1.4-1.5 Oz.

(41-44 ml)

Top of Dipstick

Figure 40

6.If the level is low, add a small amount of oil to the oil fill hole and recheck. Repeat this procedure until the oil level reaches the top of the dipstick.

NOTE: Do not overfill the unit.

O-Ring

Oil Fill Plug/Dipstick

Oil Fill Hole

Figure 41

NOTE: Make sure the O-ring is in place on the oil fill plug/dipstick when checking and changing the oil. See Figure 41.

19

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Changing The Oil

For a new engine, change the oil after the first 10 hours of operation. Change the oil while the engine is still warm. The oil will flow freely and carry away more impurities.

CAUTION: Wear gloves to prevent injury when handling the unit.

1.Unplug spark plug boot to prevent accidental starting.

2.Remove the oil fill plug/dipstick.

3.Pour the oil out of the oil fill hole and into a container by tipping the unit to a vertical position. See

Figure 42. Allow ample time for complete drainage.

Figure 42

4.Wipe up any oil residue on the unit and clean up any oil that may have spilled. Dispose of the oil according to Federal, State and local regulations.

5.Refill the crankcase with 3.4 fluid ounce (100 ml) of SAE 30 SF, SG, SH oil.

NOTE: Use the bottle and spout saved from initial use to measure the correct amount of oil. The top of the label on the bottle measures approximately 3.4 ounces (100 ml). Check the level with the dipstick. If the level is low, add a small amount of oil and recheck. Do not overfill. See Figure 43.

Fill Level

Figure 43

6.Replace the oil fill plug/dipstick.

7.Reconnect the spark plug boot.

20

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Air Filter Maintenance

Cleaning the Air Filter

WARNING: To avoid serious personal injury, always turn your trimmer off and allow it to cool before you clean or service it.

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.Open the air filter cover. Push the tab on the right side of the cover inward. Then pull the air filter cover out and to the left. See Figure 44.

NOTE: It may be necessary to remove the fuel cap to completely remove the air filter cover.

2. Remove the air filter. See Figure 44.

Air Filter

Air Filter Cover

Tab

Figure 44

3.Wash the filter in detergent and water. See Figure 45. Rinse the filter thoroughly and allow it to dry.

Figure 45

4.Apply enough clean SAE 30 motor oil to lightly coat the filter. See Figure 46.

Figure 46

Figure 47

5.Squeeze the filter to spread and remove excess oil. See Figure 47.

6.Replace the filter. See Figure 48.

NOTE: If the unit is operated without the air filter, you will VOID the warranty.

Back Plate

Back Plate Slot

Slots

Figure 48

7.Reinstall the air filter cover. Position the hooks on the left side of the air filter cover into the slots at the left side of the back plate. See Figure 48.

NOTE: It may be necessary to remove the fuel cap to reinstall the air filter cover.

8.Swing the cover to the right until the tab on the air filter cover snaps into place in the slot on the back plate. See Figure 44 and 48.

9.Replace the fuel cap if it was removed.

Carburetor Adjustment

The idle speed of the engine is adjustable through the air filter/muffler cover. See Figure 49.

NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor adjustments.

Check Fuel

Old fuel is usually the reason for improper unit performance. Drain and refill the tank with fresh fuel prior to making any adjustments. Refer to Oil and Fuel Information.

21

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

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

WARNING: The cutting attachment may spin during idle speed adjustments. Wear protective clothing and observe all safety instructions to prevent serious personal injury.

If, after checking the fuel 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. See Figure 49. Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.

NOTE: The cutting attachment should not rotate when the engine idles.

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, 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.

WARNING: After turning the unit off, make sure the cutting attachment has stopped before setting the unit down. This helps prevent serious personal injury.

Idle Adjustment Screw

Rocker Arm Clearance

This requires disassembly of the engine. If you feel unsure or unqualified to perform this, take the unit to an authorized service center.

NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 10 hours of operation and then every 25 hours of operation thereafter.

•The engine must be cold when checking or adjusting the valve clearance.

•This task should be performed inside, in a clean, dust free area.

1.Remove the muffler cover by pressing down on it, separating it from the engine cover. Using a flat blade screwdriver, disengage the middle and front tabs and slots first. The cover will hinge off from the rear tab. See Figure 50.

Engine Cover

Rear Slot

and Tab

Middle Tab

	Front Tab
Middle Slot	Front Slot

Figure 50

2.Remove the two (2) screws on top of the engine cover with a Flat-head or T-25 Torx screwdriver. See Figure 51.

Top View Of The Engine

Remove Screws

Engine Cover

Figure 49

Muffler

Figure 51

22

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

3.Remove the screw behind the engine cover. See Figure 52.

Figure 52

4.Disconnect the spark plug wire.

5.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.

6.Remove the engine cover. See Figure 51.

7.Clean dirt from around the rocker arm cover. Remove the screw holding the rocker arm cover with a large flat blade screwdriver or Torx T-25 bit. See Figure 53. Remove the rocker arm cover and gasket.

Rocker Arm Cover

Spark Plug Hole

Figure 53

8.Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that:

•The piston is at the top of its travel while looking in the spark plug hole. See Figure 53.

•Both rocker arms move freely, and both valves are closed.

If these statements are not true, repeat this step.

9.Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm. See Figure 54. Measure both the intake and exhaust valves.

The recommended clearance for both intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. See Figure 54.

Adjusting Nuts

Rocker Arms

INTAKE

EXHAUST

Feeler Gauge

Figure 54

Adjusting Nut

Rocker Arm

.003–.006 in. (.076–.152 mm)

Feeler Gauge

Valve Stem

Figure 55

10.If the clearance is not within specification:

a.Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver. See Figure 55.

•To increase clearance, turn the adjusting nut counterclockwise.

•To decrease clearance, turn the adjusting nut clockwise.

b.Recheck both clearances, and adjust as necessary.

11.Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m).

12.Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.

13.Reinstall the muffler cover. Slip the rear tab on the muffler cover into the engine cover rear slot. Then slide the remaining slots into the tabs until they snap into place. See Figure 50.

14.Check the spark plug and reinstall. See Replacing the Spark Plug.

15.Replace the spark plug wire.

23

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Replacing the Spark Plug

Use a replacement part number 180852 spark plug (or equivalent). The correct air gap is 0.025 inch (0.655 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 cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.655 mm) using a feeler gauge. See Figure 56.

CAUTION: Do not sand blast, scrape or clean electrodes. Grit in the engine could damage the cylinder.

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.

0.025 in.

(0.655 mm)

Spark Arrestor Maintenance

1.Remove the muffler cover. See Rocker Arm Clearance.

2.With a flat blade screwdriver or Torx T-20 bit, remove the screw attaching the spark arrestor cover to the muffler. See Figure 57.

Muffler

Spark Arrestor Screen

Tab

Spark Arrestor Cover

Slot

Figure 57

3.Pull the tab on the spark arrestor cover out of the muffler. Remove the spark arrestor cover.

4.Remove the spark arrestor screen from the spark arrestor cover.

5.Clean the spark arrestor screen with a wire brush or replace it.

6.Reinstall the spark arrestor screen, spark arrestor cover and screw.

Figure 56

24

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Cleaning

WARNING: To avoid serious personal injury, always turn your trimmer off and allow it to cool before you clean or service it.

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.

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. 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 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 trimmer after storage.

4.Thoroughly clean the unit and inspect 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.

•Secure the unit while transporting.

•Drain fuel from unit.

•Tighten fuel cap before transporting.

Accessories/Replacement Parts

4-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181786

Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180852

Spark Arrestor Screen . . . . . . . . . . . . . . . . . . . . . .180890

Replacement Line . . . . . . . . . . . . . . . . . . . . . . . . 180120

Replacement Line Cartridge . . . . . . . . . . . . . . . . 147345

Inner Reel Spring . . . . . . . . . . . . . . . . . . . . . . . . 610636

Outer Spool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 683301

Inner Reel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147495

Bump Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180814

Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .753-1229

Shoulder Harness . . . . . . . . . . . . . . . . . . . . . . . .682075

For specific replacement parts, refer to the parts list located on the inside back cover of this manual.

25

SECTION 8: TROUBLESHOOTING GUIDE

	Trouble	Possible Cause(s)	Corrective Action
	ENGINE WILL	• On/Off control in the STOP position	• Turn On/Off control to ON
	NOT START	• Empty fuel tank	• Fill fuel tank with fuel
		• Primer bulb wasn’t pressed enough	• Press primer bulb fully and slowly 10 times
		• Engine is flooded	• Use starting procedure with choke lever in the RUN
			position
		• Old or improperly mixed fuel	• Drain gas tank and add fresh fuel
		• Fouled spark plug	• Replace or clean spark plug
		• Plugged spark arrestor	• Clean or replace the spark arrestor
	ENGINE WILL	• Air filter is plugged	• Replace or clean the air filter
	NOT IDLE	• Old or improperly mixed fuel	• Drain gas tank and add fresh fuel
		• Improper carburetor adjustment	• Adjust according to the Carburetor Adjustment section
	ENGINE WILL	• Old or improperly mixed fuel	• Drain gas tank and add fresh fuel
	NOT	• Improper carburetor adjustment	• Take to an authorized service dealer for adjustment
	ACCELERATE
		• Cutting attachment bound with grass	• Stop the engine and clean the cutting attachment
		• Dirty air filter	• Clean or replace the air filter
		• Plugged spark arrestor	• Clean or replace spark arrestor
	ENGINE	• Old or improperly mixed fuel	• Drain gas tank and add fresh fuel
	LACKS	• Improper carburetor adjustment	• Take to an authorized service dealer for adjustment
	POWER OR
		• Fouled spark plug	• Replace or clean spark plug
	STALLS WHEN
		• Plugged spark arrestor	• Clean or replace the spark arrestor
	CUTTING
	CUTTING	• Cutting attachment bound with grass	• Stop the engine and clean cutting attachment
	ATTACHMENT	• Cutting attachment out of line	• Refill with new line
	WILL NOT
		• Inner reel bound up	• Replace the inner reel
	ADVANCE LINE
		• Cutting head is dirty	• Clean inner reel and outer spool
		• Line welded	• Disassemble, remove the welded section and rewind
		• Line twisted when refilled	• Disassemble and rewind the line
		• Not enough line is exposed	• Push the bump knob and pull out line until 4 inches
			(102 mm) of line is outside of the cutting attachment
	CUTTING LINE	• Oil is in the cutting head	• Clean the cutting head attachment
	ADVANCES
	WILDLY

If further assistance is required, contact your authorized service dealer

26

SECTION 9: SPECIFICATIONS

Engine*

Engine Type..........................................................................................................................................	Air-Cooled, 4-Cycle
Displacement.........................................................................................................................................	1.6 cu. in. (26.2 cc)
Operating RPM...................................................................................................................................................	7,200+ rpm
Idle Speed RPM ......................................................................................................................................	2,800 - 4,000 rpm
Ignition Type..........................................................................................................................................................	Electronic
Ignition Switch ...............................................................................................................................................	Rocker Switch
Valve clearance......................................................................................................................	.003–.006 in. (.076–.152 mm)
Spark Plug Gap ................................................................................................................................	0.025 inch (0.655 mm)
Lubrication ...........................................................................................................................................................	SAE 30 Oil
Crankcase Oil Capacity ................................................................................................................................	3.4 oz (100 ml)
Fuel .......................................................................................................................................................................	Unleaded
Carburetor.......................................................................................................................................	Diaphragm, All-Position
Starter...............................................................................................................................................................	Auto Rewind
Muffler .....................................................................................................................................................	Baffled with Guard
Throttle...............................................................................................................................................	Manual Spring Return
Fuel Tank Capacity.........................................................................................................................................	12 oz (355 ml)

Drive Shaft and Cutting Attachment*

Drive Shaft Housing ..................................................................................................................		Aluminum Tube (EZ-Link™)
Throttle Control ........................................................................................................................................		Finger-Tip Trigger
Unit Weight (No Fuel, with J-handle, Cutting attachment shield and Cutting attachment)		........................ 13.15 lbs (6 kg)
Cutting Mechanism .................................................................................	4-Tooth Cutting Blade, Dual String Cutting Head
Line Spool.............................................................................................................................................		Bump Line Releaser
Line Spool Diameter ............................................................................................................................		4 inches (101.6 mm)
Trimming Line Diameter ..............................................................................................................................		0.095 (2.41 mm)
Cutting Path Diameter, Cutting Attachment ........................................................................................		18 inches (45.7 cm)
Cutting Path Diameter, Cutting Blade ....................................................................................................		8 Inches (204 mm)
Shoulder Harness ...................................................................................................................................		Single Quick-Snap

*All specifications are based on the latest product information available at the time of printing. We reserve the right to make changes at any time without notice.

27

NOTES

28

EPA Emission Control Warranty Statement

Your Warranty Rights and Obligations

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

Your 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, Yard Man will repair your small off-road engine at no cost to you including diagnosis, parts and labor.

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

Owners Warranty Responsibilities

•As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your operator’s manual. Yard Man recommends that you retain all receipts covering maintenance on your small off-road engine, but Yard Man cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.

•As the small off-road engine owner, you however should be aware that Yard Man may deny you warranty coverage if your small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.

•You are responsible for presenting your small off-road engine to a Yard Man Authorized Service Center as soon as a problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.

If you have any questions regarding your warranty rights and responsibilities, you should 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 part will be performed at no charge to the owner at an Authorized Yard Man Service Center. For the nearest location please contact Yard Man at: 1-800-345-8746.

•Any warranted part which is not scheduled for replacement, as required maintenance or which is scheduled for only for regular inspection to the effect of “Repair or Replace as Necessary” is warranted for the warranty period. Any warranted part which is scheduled for replacement as required maintenance will be warranted for the period of time up to the first scheduled replacement point for that part.

•The owner will not be charged for diagnostic labor which leads to the determination that a warranted part is defective, if the diagnostic work is performed at an Authorized Yard Man Service Center.

•The manufacturer is liable for damages to other engine components caused by the failure of a warranted part still under warranty.

•Failures caused by abuse, neglect or improper maintenance are not covered under warranty.

•The use of add-on or modified parts can be grounds for disallowing a warranty claim. The manufacturer is not liable to cover failures of warranted parts caused by the use of add-on or modified parts.

•In order to file a claim, go to your nearest Authorized Yard Man Service Center. Warranty services or repairs will be provided at all Authorized Yard Man Service Centers.

•Any manufacturer approved replacement part may be used in the performance of any warranty maintenance or repair of emission related parts and will be provided without charge to the owner. Any replacement part that is equivalent in performance or durability may be used in non-warranty maintenance or repair and will not reduce the warranty obligations of the manufacturer

•The following components are included in the emission related warranty of the engine, air filter, carburetor, primer, fuel lines, fuel pick up/ fuel filter, ignition module, spark plug and muffler.

29