Operator’s Manual
English
Straight Shaft,
4-Cycle Trimmer
Model
YM26SS
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
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, accessory part #753-04121 Spark Arrestor Screen is available by contacting the service department at 550 N. 54th STREET, CHANDLER, AZ 85226-2434.
MTD SOUTHWEST INC |
550 N. 54TH STREET, CHANDLER, ARIZONA 85226-2434 |
PRINTED IN U.S.A. |
Rev1 |
PART NO. 769-00307 |
(05/02) |
TABLE OF CONTENTS |
|
Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
Page |
Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
4 |
Know Your Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
Adjusting the J-Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
10 |
Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
11 |
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
13 |
Maintenance and Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
25 |
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
26 |
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
27 |
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
29 |
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 to 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 underside of the engine. A sample model plate is explained below. For future reference, please copy the model number and the serial number of the equipment in the space below.
Copy the model / 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 in Canada 1- (800)-668-1238, to reach a Customer Support representative. Please have your unit’s model number and serial number ready when you call. See previous section to locate this information. You will be asked to enter the serial number in order to process your call.
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 #753-04121 Spark Arrestor.
WARNING!
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.
FOR QUESTIONS, CALL 1-800-345-8746 IN U.S. OR
1-800-668-1238 in CANADA
SECTION 1: RULES FOR SAFE OPERATION
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.
3
SECTION 1: RULES FOR SAFE OPERATION
READ ALL INSTRUCTIONS
WARNING: When using the unit the safety rules must be followed. For your own safety and that of bystanders please read these instructions before operating the unit. Please keep the instructions safe for later use.
BEFORE OPERATING
•Read this operating instruction manual carefully. Be thoroughly familiar with the controls and the proper use of the equipment. Know how to stop the unit and disengage the controls quickly.
•Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.
•Never allow children to operate the equipment. Never allow adults unfamiliar with the instructions to use the unit. Never allow adults to operate the equipment without proper instruction.
•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. 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 the cutting attachment shield is properly attached, and positioned as recommended. Failure to so can result in personal injury to the operator and bystanders, as well as damage to the unit.
•Use only 0.080 inch (2.03 mm) diameter genuine manufacturer’s replacement line. Never use metalreinforced line, wire, chain, or rope, etc. These can break off and become dangerous projectiles.
•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 wear eye protection. If you are 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.
•Be sure the cutting attachment is not in contact with anything before starting the 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
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 cap of the fuel tank, or add fuel, while 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 standards, and 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 any nonroad engine repair establishment, individual or authorized service dealer.
•Adjust the J-handle to your size to provide the best grip.
4
SECTION 1: RULES FOR SAFE OPERATION
•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. Use this tool only 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 while it is rotating.
•Do not touch the engine, gear housing, or muffler. These parts get extremely hot from operation and remain hot for a short time after turning the engine 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 while 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 and switch the engine to OFF for maintenance, repair, or for changing the cutting attachment or other attachments.
•Use only replacement parts and accessories approved by the manufacturer for this unit. These are available from your authorized service dealer. Use of any non approved parts or accessories could lead to serious injury to the user, or damage to the unit, and void your 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. 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 1: RULES FOR SAFE OPERATION
SAFETY AND 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
• SAFETY ALERT SYMBOL
Indicates danger, warning, or caution. 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 Z87.1-1989 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.
• PRIMER BULB
Push primer bulb, fully and slowly, 5 to 7 times.
• UNLEADED FUEL
Always use clean, fresh unleaded fuel.
• OIL
Refer to operator's manual for the proper type of oil.
6
SECTION 1: RULES FOR SAFE OPERATION
SYMBOL MEANING
• 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.
• ON/OFF STOP CONTROL
ON / START / RUN
• ON/OFF STOP CONTROL
OFF OR STOP
• HOT SURFACE WARNING
Do not touch a hot muffler or cylinder. You may get burned. These parts get extremely hot from operation. When turned off they remain hot for a short time.
• SHARP BLADE
WARNING: Sharp blade on cutting attachment shield. To prevent serious injury, do not touch line cutting blade.
• DO NOT USE METAL BLADES
WARNING: To prevent serious injury, do not attach or operate the unit with any type of metal blade.
• CHOKE CONTROL
A • FULL choke position.
B • PARTIAL choke position.
C • RUN position.
7
SECTION 2: KNOW YOUR TRIMMER
APPLICATIONS
As a trimmer;
•Cutting grass and light weeds.
•Edging
•Decorative trimming around trees, fences, etc.
Other optional accessories may be used with the YM26SS. See list of add-ons on page 13.
EZ-Link™ Coupler 
Shaft Housing 
Spark Arrestor
Spark Plug
Muffler 
Muffler Guard
Fuel Cap
Starter Rope Grip
On/Off Stop Control
Shaft Grip
Throttle
Control
J-Handle
Choke Lever
Spark Plug
Air Filter Cover
Primer Bulb
Cutting Attachment
Shield
Line Cutting Blade
Cutting Attachment |
Oil Fill Plug / Dipstick
Engine Feet
8
SECTION 3: ADJUSTING THE J-HANDLE
ADJUSTING THE J-HANDLE
1.Loosen the four (4) screws holding the J-handle in place (Fig. 1). Do not completely remove the screws.
3.While holding the unit in the operating position (Fig. 3), position the J-handle to the location that provides you the best grip.
J-Handle
(4) Screws
Fig. 1
2.Slide the J-handle in or out until the arrow/white line on the decal touches the clamp assembly (Fig. 2).
Fig. 3
4.Tighten the clamp screws evenly, until the J-handle is secure.
Decal
Fig. 2
9
SECTION 4: OIL AND FUEL INFORMATION
DANGER: OVERFILLING OIL CRANKCASE MAY CAUSE SERIOUS PERSONAL INJURY! The importance of checking and maintaining the proper oil level in the crank case cannot be overemphasized. Check oil before each use and change as needed. See Changing the Oil in the Maintenance and Repair Instructions section.
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.
ADDING OIL TO CRANKCASE – INITIAL USE
NOTE: This unit is shipped without being filled with oil. In order to avoid damage to the unit, put oil in the crankcase before attempting to start unit.
Your unit is supplied with one 3.4 fluid oz. (100 ml.) bottle of SAE 30 SF, SG, SH oil (Fig. 4).
NOTE: Save the bottle to measure the correct amount for future oil changes. See Changing the Oil in the Maintenance and Repair Instructions section.
1.Unscrew the top of the bottle of oil and remove the paper seal covering the opening. Replace top. Cut the tip off the funnel spout (Fig. 4).
2.Place the unit on a flat level surface.
3.Remove the oil plug / dipstick from the crankcase (Fig. 5).
Funnel Spout 
Fig. 4
O-Ring 
Oil Fill Plug/Dipstick
Oil Fill Hole 
4. Pour the entire bottle of oil into the oil fill hole (Fig. 6).
Oil Fill 
Fig. 6
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.
RECOMMENDED FUEL TYPE
Old fuel is the primary reason for the unit not running properly. 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 ruin the fuel 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 fuel, or its use is unavoidable, follow recommended precautions.
•Always use fresh unleaded gasoline
•Use the fuel additive STA-BIL® or an equivalent.
•Drain tank and run the engine dry before storing unit.
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.
Fig. 5
10
SECTION 4: OIL AND FUEL INFORMATION
FUELING 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 fuel cap (Fig. 7).
WARNING: Remove fuel cap slowly to avoid injury from gasoline spray.
Unleaded
Gasoline
Gas Can Spout
Fuel Tank
Fuel Cap 
Fig. 7
2.Place spout of gas container into the fill hole on the fuel tank (Fig. 7) and fill tank.
WARNING: Add gasoline in a clean, well ventilated area outdoors. Avoid creating a source of ignition for spilt fuel.
NOTE: Do not overfill 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.
SECTION 5: STARTING/STOPPING INSTRUCTIONS
STARTING INSTRUCTIONS
Cold Start - First Start of the Day or Engine Ran Out of Fuel
WARNING: Operate this unit only in a well ventilated area outdoors. Carbon monoxide exhaust fumes can be lethal in a confined area.
1.Check oil level in crankcase. See Checking the Oil Level in the Maintenance and Repair Instructions section.
2.Fill the fuel tank with fresh, clean, unleaded gasoline.
3.Put the Start/Stop Engine Control in the START [I] position (Fig. 8).
Start / Stop
Control
Fig. 8
4.Place the choke lever in the FULL choke (A) 
position (Fig. 9).
NOTE: Slide the choke lever directly above the appropriate symbol on air filter cover decal (Fig. 9).
5.Fully press and release the primer bulb slowly 7 times. Gasoline should be felt and visible in the bulb (Fig. 9). If gasoline has not entered the bulb, press three more times, or until it does.
Choke
Lever
Primer
Bulb
Fig. 9
11
SECTION 5: STARTING/STOPPING INSTRUCTIONS
6.Squeeze the throttle control to the wide open (full throttle) position.
7.With the unit in the starting position (Fig. 10) pull the
starter rope briskly 5 times in the FULL choke (A) 
position. If the engine attempts to run before the fifth pull, proceed to step 8.
8.Move the choke lever to the PARTIAL (B) 
position (Fig. 9).
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 7.
NOTE: If the outside temperature is below 40˚F (4˚C), run the unit at full throttle for 30 seconds to one (1) minute
10.Move the choke lever to the RUN (C) 
position and run at full throttle for 30 seconds, and up to one (1) minute in temperatures below 40˚F (4˚ C).
WARNING: Avoid accidental starting. Be in the starting position whenever pulling the starting rope. To avoid serious personal injury, the operator and unit must be in a stable position while starting.
Starter Rope
Throttle Control 
11.Release the throttle control to the idle position and begin operation.
NOTE: If the engine does not start using these procedures, repeat steps 5 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 (Fig. 8).
2.Move the choke lever to the PARTIAL (B) 
position (Fig. 9).
3.Fully press and release the primer bulb slowly 7 times. Gasoline should be felt and visible in the bulb (Fig. 9). If gasoline has not entered the bulb, press three more times, or until it does.
4.Squeeze the throttle control to the wide open (full throttle) position.
5.With the unit in the starting position (Fig. 10), pull the starter rope briskly until the engine starts.
6.When the engine starts, move the choke lever to the
RUN (C) 
position, and run at full throttle for 30 seconds, and up to one (1) minute in temperatures below 40˚F (4˚ C).
NOTE: If the engine does not start using the Engine Re-start procedures, revert to the Cold Start procedures earlier in this section.
NOTE: 4-stroke engines, like cars, are able to start in the idle position. As an alternate method, you may want to start your unit in the idle position when the unit is warm. With the Start/Stop control in the START position, pull the starter rope briskly. When the engine starts, run at full throttle for 30 seconds. If the unit fails to start or dies, revert to the Engine Re-Start proceedure.
STOPPING INSTRUCTIONS
1.Release your hand from the throttle control (Fig. 10). Allow the engine to idle.
2.To stop the engine, put the Start/Stop Engine Control in the STOP [O] position (Fig. 8).
Fig. 10
12
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 Sweeper/Blower . . . . . . . . . . . . . . . . . . . . . . . . . SB720r Tree Pruner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TP720r Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720r
WARNING: Read and understand operator’s manual for add-on prior to operation.
Removing the Cutting Attachment or Add-Ons:
1.Turn the knob counterclockwise to loosen (Fig. 11).
2.Press and hold the release button (Fig. 11).
3.While firmly holding the upper shaft housing, pull
the cutting attachment or add-on straight out of the EZ-Link™ coupler (Fig. 12).
Installing the Cutting Attachment or Add-Ons:
WARNING: To avoid serious personal injury and damage to the unit, shut unit off before removing or installing add-ons.
NOTE: To make installing or removing the add-on easier, place the unit on the ground or on a work bench.
1. Turn knob counterclockwise to loosen (Fig. 11).
EZ-Link™ Coupler |
Release Button |
|
2.While firmly holding the add-on, push it straight into the EZ-Link™ coupler (Fig. 12).
NOTE: Aligning the release button with the guide recess will help installation (Fig. 11).
EZ-Link™ Coupler |
Release |
Release Button |
Button Hole |
|
|
|
|
Upper Shaft Housing
Lower Shaft Housing
Fig. 12
3. Turn the knob clockwise to tighten (Fig. 11).
Knob 
Guide Recess
Fig. 11
13
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 (Fig. 13). Check for the following:
•The operator is wearing eye protection and proper clothing.
•The right arm is slightly bent, and the hand is holding the shaft grip.
•The left arm is straight, and the hand is holding the J-handle.
Fig. 13
•The unit is at waist level.
•The cutting attachment is parallel to the ground and easily contacts the vegetation to be cut without the operator having to bend over.
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 (Fig. 14) while operating the trimmer at high speed.
NOTE: Always keep the trimming line fully extended. Line release becomes more difficult as cutting line becomes shorter.
Each time the head is bumped, about 1 inch (25.4 mm.) of trimming line is released. A blade in the cutting attachment shield will cut the line to the proper length if excess line is released.
For best results, tap the Bump Head™ on bare ground or hard soil. If line release is attempted in tall grass, the engine may stall. Always keep the trimming line fully extended. Line release becomes more difficult as the cutting line becomes shorter.
NOTE: Do not rest the Bump Head™ on the ground while the unit is running .
CAUTION: Do not remove or alter the line cutting blade assembly. Excessive line length will make the clutch overheat. This may lead to serious personal injury or damage to the unit.
Some line breakage will occur from:
•Entanglement with foreign matter
•Normal line fatigue
•Attempting to cut thick, stalky weeds
•Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
•Keep the cutting 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 forwardbackward 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 previous trimming techniques
•What vegetation is being cut
•Where it’s being cut
For example, the line will wear faster when trimming against a foundation wall as opposed to trimming around a tree.
Fig. 14
14
SECTION 6: OPERATING INSTRUCTIONS
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts, fences, etc.
Rotate the whole unit so that the cutting attachment is at a 30° angle to the ground (Fig. 15).
Fig. 15
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to an authorized service dealer.
MAINTENANCE SCHEDULE
These required maintenance procedures should be performed at the frequency stated in the table. They should also be included as part of any seasonal tune-up.
WARNING: To prevent serious injury, never do maintenance or repairs with unit running. Always do maintenance and repairs on a cool unit. Disconnect spark plug wire to ensure the unit will not start.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any nonroad engine repair establishment, individual or authorized service dealer.
In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary after 50 hours of operation. If you notice lost RPM, poor performance or general lack of acceleration, this service may be required. If you feel your engine is need of this inspection, refer service to any nonroad engine repair establishment, individual or authorized service dealer for repair. DO NOT attempt to perform this process yourself as engine damage may result from contaminants involved in the cleaning process for the port.
FREQUENCY |
MAINTENANCE REQUIRED |
REFER TO: |
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|
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|
|
Before starting engine |
Fill fuel tank with fresh fuel |
Page 10-11 |
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|
Check oil |
Page 19 |
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Every 10 hours |
Clean and re-oil air filter |
Page 20-21 |
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1st Change at 10 hours |
Change oil |
Page 19-20 |
|
Every 25 hours there after |
Change oil |
||
Page 19-20 |
|||
Every 25 hours |
Clean spark arrestor |
||
Page 24 |
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||
10 hours on new engine |
Check rocker arm to valve clearance and adjust as |
Page 22-23 |
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required |
||
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||
Every 25 hours |
Check rocker arm to valve clearance and adjust as |
Page 22-23 |
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required |
||
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||
Every 25 hours |
Check spark plug condition and gap |
Page 24 |
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15
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
LINE INSTALLATION FOR THE SPEEDSPOOL®
Always use genuine MTD 0.080 inch (2.03 mm) replacement line. Line other than specified may make the engine overheat or fail.
WARNING: Never use metal-reinforced line, wire, or rope, etc. These can break off and become dangerous projectiles.
There are two methods to replace the SpeedSpool® trimming line:
•Wind the inner reel with new line
•Install a prewound inner reel
Winding the Inner Reel With New Line
NOTE: It is unnecessary to remove the bump knob to install new trimming line.
1.Cut two pieces of 0.080 inch (2.03 mm) trimming line, 10 feet (3 m) long.
WARNING: 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.
2.Hold the outer spool and turn the inner reel counterclockwise to line up the arrows on the outer spool and inner reel (Fig. 16).
Top View Of The SpeedSpool®
Arrows
Outer Spool
Inner Reel 
Bump Knob
Fig. 16
3.Pull old line out of the line loading and line locking holes (Figs. 17 and 18).
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 (Fig. 17). Do not bend the line when inserting it into the eyelet.
Trimming Line
Eyelet
Line Loading Hole
Fig. 17
5.Insert the line into the locking hole (Fig. 18). Do not push the line more than 1/2 inch (12.7 mm) into the line locking hole. When inserted correctly the line will form a small loop (Fig. 18).
Line Locking Hole
Fig. 18
6.Pull the line from the outer spool until the line is tight against the inner reel (Fig. 19).
Fig. 19
16
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
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 (Fig. 20).
NOTE: Do not wind the inner reel before installing the second piece of line.
Fig. 20
9.If winding the line becomes difficult or the line jams, pull the ends of the line from the spool (Fig. 21). Continue winding the inner reel counterclockwise .
Fig. 21
INSTALLING A PREWOUND REEL
1.Turn the bump knob counterclockwise and remove the bump knob, spring and foam seal (Fig. 22).
Bump Knob 
Foam Seal 
Spring
Inner Reel 
Fig. 22
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 (Fig. 23). Push the new inner reel, arrow side up, into the outer spool.
Fig. 23
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. (Fig. 21).
Releasing the Inner Reel
If the SpeedSpool® does not release line correctly, pull the ends of the line firmly from the spool (Fig. 21). If this does not release line, follow the Cleaning the SpeedSpool® instructions in the Maintenance and Repair Instructions section.
17
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
CLEANING THE SPEEDSPOOL®
Cleaning the SpeedSpool® may be necessary:
•To remove jammed or excess line, or
•If 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 (Fig. 24).
Fig. 24
2.Pull out the bump knob, spring and foam seal (Fig. 22).
3.Pull the inner reel with existing line from the outer spool (Fig. 23).
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 (Fig. 25) with warm soapy water.
Inner Reel 
5.Clean the shaft and the inner surface of the outer spool. To clean the shaft underneath the plunger, press down on the plunger (Fig. 26). Remove any dirt or debris from the shaft.
Shaft
Plunger
Fig. 26
NOTE: The inner reel must be totally dry before reinstalling it into the outer spool. Do not lubricate the inner reel or outer spool assembly.
6.Place the inner reel into the outer spool.
7.Place the bump knob, spring and foam seal into the inner reel (Fig. 22).
8.Press the bump knob down and tighten clockwise.
9.Install new line as described in Line Installation for the SpeedSpool® in the Maintenance and Repair Instructions section.
SPEEDSPOOL® REPLACEMENT PARTS
Replacement Line . . . . . . . . . . . . . . . . . . . . 791-181472 Replacement Line Cartridge . . . . . . . . . . . 791-181460B Inner Reel Spring . . . . . . . . . . . . . . . . . . . . 791-181465B Foam Seal . . . . . . . . . . . . . . . . . . . . . . . . . . 791-181467 Inner Reel . . . . . . . . . . . . . . . . . . . . . . . . . 791-181460B Bump Head™ Knob Assembly . . . . . . . . . 791-181468B (Bump Head™, Inner Reel, Spring, )
These SpeedSpool® replacement parts can be purchased from your local authorized dealer.
Fig. 25
18
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
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 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, etc., 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 oil level. Oil should be up to the top of the dipstick (Fig. 27).
Oil Fill Plug/Dipstick
O-Ring 
Full
Add 1.4-1.5 Oz.
(41-44 ml)
Top of Dipstick
Fig. 27
6.If the level is low, add a small amount of oil to the oil fill hole and recheck (Fig. 27). Repeat 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 
Fig. 28
NOTE: Make sure the O-ring is in place on the oil fill plug/dipstick when checking and changing the oil (Fig. 28).
DANGER: OVERFILLING OIL CRANKCASE MAY CAUSE SERIOUS PERSONAL INJURY! The importance of checking and maintaining the proper oil level in the crank case cannot be overemphasized. Check oil before each use and change as needed. See Changing the Oil below.
Fig. 29
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 wire to eliminate 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 (Fig. 30). Allow ample time for complete drainage.
Fig. 30
19
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
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. 3.4 ounce (100 ml) is approximately to the top of the label on the bottle (Fig. 31). Check the level with the dipstick. If the level is low, add a small amount of oil and recheck (Fig. 27). Do not overfill.
Choke Lever
Air Filter
Air Filter Cover
Tab
Fill Level
Fig. 31
6.Replace the oil fill plug/dipstick.
7.Reconnect spark plug wire.
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 it or do any maintenance on it.
Clean and re-oil the air filter every 10 hours of operation. It is an important item to maintain. Not maintaining the air filter will VOID the warranty.
1.Open the air filter cover. Push the tab on the right side of the cover in, pull the air filter cover out and to the left (Fig. 32).
NOTE: It may be necessary to remove the fuel cap to completely remove the air filter cover
2. Remove the air filter (Fig. 32).
Fig. 32
3.Wash the filter in detergent and water (Fig. 33). Rinse the filter thoroughly and allow it to dry.
Fig. 33
4.Apply enough clean SAE 30 motor oil to lightly coat the filter (Fig. 34).
Fig. 34
20
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
5.Squeeze the filter to spread and remove excess oil (Fig. 36).
Fig. 35
6. Replace the filter (Fig. 35).
NOTE: If the unit is operated without the air filter, you will VOID the warranty.
Back Plate |
Choke Lever |
Back Plate Slot
Slots
Fig. 36
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 (Fig. 36).
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 (Fig. 36).
9.Replace the fuel cap, if removed.
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjustment screw is reached though a hole in the top of the engine cover (Fig 37).
NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor adjustments.
Check Fuel
Old fuel is usually the main reason for the unit not running properly. Drain and refill the tank with clean, fresh unleaded fuel prior to doing any adjustments. Refer to the Oil and Fuel Information section.
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 in the Maintenance and Repair Instructions section.
Adjust Idle Speed Screw
WARNING: The cutting attachment may be spinning during idle speed adjustment. 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.
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 engine cover
(Fig. 37). 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.
Idle Adjustment Screw
Fig. 37
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 screw should solve most engine problems.
If not and:
•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: When the unit is turned off make sure the cutting attachment has stopped before the unit is set down to prevent serious personal injury.
21
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
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 the corner with a flat blade screwdriver (Fig. 38). Slide the notches on the sides of the muffler cover over the tabs on the engine cover and remove
Engine Cover
Muffler Cover 
Fig. 38
2.Remove the two (2) screws on top of the engine cover with an appropriate screwdriver (Fig. 39).
Top View Of The Engine
Engine Cover |
Remove Screws |
Muffler
3. Remove the screw behind the engine cover (Fig. 40).
Screw
Fig. 40
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 (Fig. 39).
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 T25 bit
(Fig. 41). Remove the rocker arm cover and gasket.
Rocker Arm Cover
Spark Plug Hole
Fig. 41
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 (Fig. 41).
•Both rocker arms move freely, and both valves are closed.
If not, repeat this step.
Fig. 39
22
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
9.Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm (Fig 42). Do both intake and exhaust valves.
Rocker Arms |
Adjusting Nuts |
|
Feeler Gauge
Gasket
Fig. 42
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 (Fig. 43).
Adjusting Nut
Rocker Arm
.003–.006 in. (.076–0.152 mm)
Feeler Gauge
Valve Stem
Fig. 43
10.If the clearance is not within specification:
a.Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 42).
•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).
NOTE: A rocker arm cover gasket, Part # 791-182099 can be purchased from your local authorized dealer.
12.Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.
13.Replace the muffler cover. Slip the long tabs on the muffler cover into the engine cover. Slide the notches on the side of the muffler cover over the tabs on the engine cover and snap into place
(Fig. 38).
14.Check the spark plug and reinstall. See Replacing the Spark Plug in the Maintenance and Repair Instructions section.
15.Replace the spark plug wire.
23
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
REPLACING THE SPARK PLUG
Use only genuine MTD spark plugs. The correct air gap is 0.025 in. (0.655 mm.). Remove the plug after every 50 hours of operation and check its condition.
1.Stop the engine and allow it to cool. Grasp the plug wire firmly and pull the cap from the spark plug.
2.Clean dirt from 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 (Fig. 44).
0.025 in.
(0.655 mm.)
Fig. 44
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 in. 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.
5. Replace the spark plug wire.
NOTE: A replacement spark plug Part # 791-180852 can be purchased from your local authorized dealer.
SPARK ARRESTOR MAINTENANCE
1.Remove the muffler cover. See Rocker Arm Clearance in the Maintenance and Repair Instructions section.
2.With a flat blade screwdriver or Torx T20 bit, remove the screw attaching the spark arrestor cover to the muffler (Fig. 45).
Muffler |
Spark Arrestor Screen |
Tab Screw
Spark Arrestor Cover
Slot
Fig. 45
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.
6.Reinstall the spark arrestor screen, spark arrestor cover, and screw.
NOTE: A replacement spark arrestor screen Part # 791180890 can be purchased from your local authorized dealer.
ACCESSORIES/REPLACEMENT PARTS
4-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . 791-181786
Oil Fill Plug / Dipstick . . . . . . . . . . . . . . . . . . 791-182378
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . 791-180852B
Spark Arrestor Screen . . . . . . . . . . . . . . . . . 791-180890
Replacement Line Cartridge . . . . . . . . . . .791-181460B
Inner Reel Spring . . . . . . . . . . . . . . . . . . . . 791-181465B
Bump Head™ Knob Assembly . . . . . . . . . 791-181468B
Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . 791-181083
Shoulder Harness . . . . . . . . . . . . . . . . . . .791682075B
Coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . 791-181616B
24
SECTION 8: CLEANING AND STORAGE
CLEANING
WARNING: To avoid serious personal injury, always turn your trimmer off and allow it to cool before you clean or do any maintenance on 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 such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth.
STORAGE
•Never store the unit with gasoline 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.
Store the unit in one of three (3) positions:
1.The unit hanging by the cutting attachment end.
2.The unit hanging by the engine.
3.The unit setting upright on the cutting attachment shield and engine feet.
LONG TERM STORAGE
If the unit will be stored for an extended time,
1.Drain all gasoline from the gas tank into a container . Do not use gas that has been stored for more than 60 days. Dispose of the old gasoline in accordance to Federal, State, and Local regulations.
2.Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from the carburetor.
3.Allow the engine to cool. Remove the spark plug and put 1 oz. (30 ml) of 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.Change the oil. See Changing the Oil in the
Maintenance and Repair Instructions section. Dispose of the old oil in accordance to Federal, State, and Local regulations.
5.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 the gas tank before transporting.
•Tighten gas cap before transporting.
25
SECTION 9: TROUBLESHOOTING
ENGINE WILL NOT START
C A U S E |
A C T I O N |
Ignition switch is OFF |
Turn switch to ON |
Empty fuel tank |
Fill fuel tank |
Primer bulb wasn't pressed enough |
Press primer bulb fully and slowly 5-7 times |
Engine flooded |
Use starting procedure with choke lever in the |
|
RUN position |
Old gasoline |
Drain fuel tank / Add fresh gasoline |
Fouled spark plug |
Replace or clean the spark plug |
|
|
ENGINE WILL NOT IDLE |
|
|
|
C A U S E |
A C T I O N |
Air filter is plugged |
Replace or clean the air filter |
Old gasoline |
Drain fuel tank / Add fresh gasoline |
Improper carburetor adjustment |
Adjust per instruction |
|
|
ENGINE WILL NOT ACCELERATE |
|
|
|
C A U S E |
A C T I O N |
Old gasoline |
Drain gas tank / Add fresh gasoline |
Improper carburetor adjustment |
Take to an authorized service dealer for |
|
carburetor adjustment |
Cutting head bound with grass |
Stop the engine and clean the cutting attachment |
Dirty air filter |
Clean or replace the air filter |
Clogged spark arrestor screen |
Clean or replace |
|
|
ENGINE LACKS POWER OR STALLS WHEN CUTTING
C A U S E |
A C T I O N |
Old gasoline |
Drain fuel tank / Add fresh gasoline |
Improper carburetor adjustment |
Take to an authorized service dealer for |
|
carburetor adjustment |
Clogged spark arrestor screen |
Clean or replace |
|
|
CUTTING HEAD WILL NOT ADVANCE LINE
C A U S E
Cutting head bound with grass
Cutting head out of line
Inner reel bound up
Cutting head dirty
Line welded
Line twisted when refilled
Not enough line is exposed
A C T I O N
Stop the engine and clean cutting attachment
Refill with new line
Replace the inner reel
Clean inner reel and outer spool
Disassemble, remove the welded section and rewind the line
Disassemble and rewind the line
Push the bump knob and pull out line until 4 inches (102 mm) of line is outside of the cutting attachment
CUTTING LINE ADVANCES UNCONTROLLABLY
C A U S E |
A C T I O N |
Oil in cutting head |
Clean the cutting attachment |
|
|
If further assistance is required, contact your authorized service dealer.
26
SECTION 10: |
SPECIFICATIONS |
|
|
|
|
|
|
ENGINE |
|
|
|
ENGINE |
|
|
|
Engine Type . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . . Air-Cooled, 4-Cycle |
Displacement . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . . 1.6 cu. in. (26.2 cc) |
Clutch Type . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . . . . . . . . . Centrifugal |
Operating RPM . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . . . . . 7200-8300 rpm |
Idle Speed RPM . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . . . . 3000-4500 rpm |
Operating Switch Type . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . |
Electronic Rocker Switch |
Valve clearance (intake and exhaust) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 003–.006 in. (.076–.0152 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) |
Fuel Tank . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . . . . HD Polyethylene |
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DRIVE SHAFT & CUTTING ATTACHMENT |
|
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|
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) . . |
. . . . . 13.5 lbs (6.13 kg) |
||
Cutting Mechanism . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . |
Dual String Cutting Head |
Line Spool . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . Bump Line Releaser |
Line Spool Diameter . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . 3 inches (76.2 mm) |
Trimming Line Diameter . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
0.080 inches (2.03 mm) |
Cutting Path Diameter . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . |
. . . 16 inches (40.6 cm) |
27
SECTION 11: PARTS LIST FOR PPN 41AD26SC401
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2 |
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1 |
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4 |
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20 |
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5 |
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21 |
22 |
23 |
24 |
26 |
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6 |
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25 |
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8 |
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28 |
30 |
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91 |
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7 |
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29 |
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45 |
41 |
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9 |
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31 |
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32 |
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11 |
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46 |
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38 |
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33 |
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42 |
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43 |
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44 |
39 |
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34 |
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47 |
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16 |
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37 |
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36 |
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48B |
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53 |
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48A |
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54 |
52 |
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90 |
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55 |
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57 |
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87 |
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89 |
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50 |
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88 |
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56 |
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51 |
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86 |
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60 |
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79 |
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61 |
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58 |
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77 |
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72 |
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59 |
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76 |
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70 |
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74 |
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62 |
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75 |
73 |
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63 |
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64 |
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92 |
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93 |
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85 |
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65 |
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71 |
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81 |
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70 |
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94 |
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68 |
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82 |
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67 |
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66 |
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Reissued 5/02
28
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