Cub Cadet CC4175, CC4125 User Manual

Operator’s Manual

4-Cycle Gas Trimmers

CC4125/ CC4175

TABLE OF CONTENTS

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Maintenance & Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . .5 Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

In an effort to reduce the impact on the forests, and reduce carbon and greenhouse gas emissions, MTD is using less paper by reducing the text size of this manual.

SAVE THESE INSTRUCTIONS

For service call 1-877-282-8684, or 1-800-668-1238 in Canada to obtain a list of authorized service dealers near you. For more details about your unit, visit our website at www.cubcadet.com.

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.

DO NOT RETURN THE UNIT TO THE RETAILER. PROOF OF PURCHASE WILL BE REQUIRED FOR WARRANTY SERVICE.

THIS PRODUCT IS COVERED BY ONE OR MORE U.S. PATENTS. OTHER PATENTS PENDING.

Service on this unit both within and after the warranty period should be performed only by an authorized and approved service dealer.

Before beginning, locate the unit’s model plate. It lists the model and serial numbers of your unit. Refer to the sample plate below and copy the information for future reference.

Copy the model and parent part number here:

Copy the serial number here:

SPARK ARRESTOR NOTE

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 #753-05297 Spark Arrestor Kit.

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.

All information, illustrations, and specifications in this manual 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.

Copyright© 2007 MTD SOUTHWEST INC, All Rights Reserved.

PART NO. 769-03534A

(12/07)

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 WARNINGS FOR GAS UNITS

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

SYMBOL MEANING

SAFETY ALERT: 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.

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 1-877-282-8684 IN U.S. OR 1-800-668-1238 in CANADA

• IMPORTANT SAFETY INSTRUCTIONS • READ ALL INSTRUCTIONS BEFORE OPERATING

WARNING: When using the unit, you must follow the safety rules. Please read these instructions before operating the unit in order to ensure the safety of the operator and any bystanders.

Please keep these instructions for later use.

•Read the instructions carefully. Be familiar with the controls and proper use of the unit.

•Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.

•Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.

•All guards and safety attachments must be installed properly before operating the unit.

•Inspect the unit before use. Replace damaged parts. Check for fuel leaks. Make sure all fasteners are in place and secure. Replace parts that are cracked, chipped, or damaged in any way. Do not operate the unit with loose or damaged parts.

•Carefully inspect the area before starting the unit. Remove all debris and hard or sharp objects such as glass, wire, etc.

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

•Clear the area of children, bystanders, and pets. At a minimum, keep all children, bystanders, and pets outside a 50 feet (15 m.) radius; there still may be a risk to bystanders from thrown objects. Bystanders should be encouraged to wear eye protection. If you are approached, stop the unit immediately.

•Use only 0.105 inch, 2.67 mm diameter original equipment manufacturer replacement line. Never use metal-reinforced line, wire or rope. These can break off and become dangerous projectiles.

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

•Store fuel only in containers specifically designed and approved for the storage of such materials.

•Avoid creating a source of ignition for spilled fuel. Do not start the engine until fuel vapors dissipate.

•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. 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 as a trimmer. 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 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. Be 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 original equipment manufacturer 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, or damage to the unit, and void your warranty.

2

RULES FOR SAFE OPERATION

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

•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.

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

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					• THROWN OBJECTS AND ROTATING CUTTER CAN
			Indicates danger, warning or caution. May be used in					CAUSE SEVERE INJURY
								WARNING: Small objects can be propelled at high
			conjunction with other symbols or pictographs.
								speed, causing injury. Keep away from the rotating rotor.
			• WARNING - READ OPERATOR'S MANUAL
			Read the operator’s manual(s) and follow all warnings					• KEEP BYSTANDERS AWAY
								WARNING: Keep all bystanders, especially children
			and safety instructions. Failure to do so can result in
			serious injury to the operator and/or bystanders.					and pets, at least 50 feet (15 m.) from the operating area.
			• WEAR EYE AND HEARING PROTECTION
			WARNING: Thrown objects and loud noise can cause					• HOT SURFACE WARNING
								Do not touch a hot muffler or cylinder. You may get
			severe eye injury and hearing loss. Wear eye protection
			meeting ANSI Z87.1-1989 standards and ear protection when					burned. These parts get extremely hot from
			operating this unit. Use a full face shield when needed.					operation. When turned off they remain hot for a short
								time.
			• UNLEADED FUEL
			Always use clean, fresh unleaded fuel					• OIL
								Refer to operator’s manual for the proper type of oil.
			• ON/OFF STOP CONTROL
								• PRIMER BULB
			ON / START / RUN
								Push primer bulb, fully and slowly, 10 times.
			• ON/OFF STOP CONTROL
			OFF or STOP					• SHARP BLADE
								WARNING: Sharp blade on cutting attachment
								shield. To prevent serious injury, do not touch the line
								cutting blade.

3

KNOW YOUR UNIT

KNOW YOUR UNIT

Applications:

•Cutting grass and light weeds.

•Edging

•Decorative trimming around trees, fences, etc.

Other optional accessories may be used with your unit. Refer to Operating the Rapid-Line™ System for a list of add-ons.

NOTE: The below illustration may differ slightly from your unit. For example, the picture shows a straight shaft. Your unit may have a curved shaft.

Spark Arrestor	Spark Plug
Muffler	Oil Fill Plug
Muffler Guard
Starter Rope
Grip
Shaft Grip	Primer
On/Off Stop	Bulb
Control

	Throttle
	Control
	J-Handle
	Air Filter Cover
	Fuel Cap
	Rapid-Link™
CC4125	Cutting Attachment
	Shield

Shaft Housing

CC4175

Line Cutting

Blade

Cutting Attachment

ASSEMBLY INSTRUCTIONS

INSTALL CUTTING ATTACHMENT SHIELD

WARNING: To prevent serious personal injury, never operate the trimmer without the cutting attachment shield in place.

Use the following instructions if the cutting attachment shield on your unit is not installed. Use only the instructions that apply to the type of shaft and shield that your unit is equipped with.

CC4125

1.Place the cutting attachment shield onto the shaft housing. Be sure the guard mounting bracket slides into the slot on the edge of the cutting shield. Rotate the shield into place, counterclockwise. The holes in the guard mounting bracket and cutting attachment shield will line up (Fig. 1).

2.From inside the cutting attachment shield, push the square bolt through the hole until the threaded end protrudes through the guard mounting bracket (Fig. 2).

3.Put the washer on the bolt, then screw the wing nut onto the bolt and tighten. Figure 3 shows the installation process from underneath the unit.

CC4175

1.Slide the cutting attachment shield into the shield mount on the cutting attachment. Align the screw holes in the shield with the holes in the cutting attachment (Fig. 3).

2.Place a hex lock nut into one of the three recessed holes on the top of the cutting attachment shield (Fig 4).

3.Install a screw into the hole from the bottom of the cutting attachment shield and screw it into the nut installed in step 2 (Fig. 4). Do not tighten.

4.Repeat steps 2 and 3 until all three screws have been started, then tighten securely.

Cutting
Attachment	Shaft
Shield
	Housing
	Guard
	Mounting
	Bracket
	Fig. 1
Guard Mounting	Washer
Bracket	Wing Nut
Square
Bolt
	Fig. 2
Shaft Housing	Cutting
	Attachment
	Shield
	Shield Mount

Cutting Attachment

ADJUST THE J-HANDLE		Fig. 3

1.Loosen the screws.

2.Slide the J-handle in or out until the arrow/white line on the decal touches the clamp assembly (Fig. 5). You must first loosen the screws if the handle is pre-installed.

3.While holding the unit in the operating position (Fig. 16), position the J-handle to the location that provides you the best grip.

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

Screws (4)

J-Handle

Nuts (3)

Hex Lock	Decal
Nut	Top
	Clamp
Recessed Holes	Middle
	Clamp
Screws (3)	Bottom
	Clamp
Fig. 4	Fig. 5

OIL AND FUEL INFORMATION

WARNING: OVERFILLING THE CRANKCASE WITH OIL 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.

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 3.04 fluid oz. (90 ml.) bottle of SAE 30 SF, SG, SH oil (Fig. 6).

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 (Fig. 6).

2.Place the unit on a flat level surface (Fig. 7).

3.Remove the oil plug / dipstick from the crankcase (Fig. 8).

4.Pour the entire bottle of oil into the oil fill hole (Fig. 7). 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.

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

Fill Level

Funnel

Spout

Fig. 6

Fig. 7

Oil Fill Plug

O-Ring

Oil Fill Hole

Fig. 8

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 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

WARNING: Add fuel in a clean, well ventilated outdoor area. Wipe up any spilled fuel immediately. Avoid creating a source of ignition for spilt fuel. Do not start the engine until fuel vapors dissipate.

WARNING: Gasoline is extremely flammable. Ignited vapors may explode. 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 at a distance from the area.

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: Remove fuel cap slowly to avoid injury from fuel spray. Never operate the unit without the fuel cap securely in place.

1.Remove the fuel cap (Fig. 9).

2.Place the gas container’s spout into the fill hole on the fuel tank (Fig. 9) and fill the tank.

NOTE: Do not overfill the tank.

3.Wipe up any gasoline that may have spilled.

4.Reinstall the fuel cap.

Gas Can Spout

Fuel Tank		Fuel Cap
	Fig. 9

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.

STARTING AND STOPPING INSTRUCTIONS

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

WARNING: Avoid accidental starting. Make sure you are in the starting position when pulling the starter rope (Fig. 13). To avoid serious injury, the operator and unit must be in a stable position while starting. Make sure that any Add-On item is installed correctly and secure before starting the unit.

STARTING INSTRUCTIONS

1.Check the oil level in the crankcase. Refer to Checking the Oil Level.

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

NOTE: There is no need to turn the unit on. The On/Off Stop Control is in the ON (I) position at all times (Fig. 10).

IF COLD... For cold weather conditions (below 40°F), flip the Cold Weather Start Lever (Fig. 11) down to the start/closed position and continue to step 3. DO NOT flip this lever down if the temperature is above 40°F.

4

STARTING AND STOPPING INSTRUCTIONS

.	Fully press and release the primer bulb 10 times,
	slowly. Some amount of fuel should be visible in the
	primer bulb and fuel lines (Fig. 11). 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.

4.With the unit in the starting position, do not squeeze the throttle control (Fig. 12). Pull the starter rope out a short distance, until you feel some resistance. This is usually around 2-4 inches. Then pull the rope smoothly and briskly. Repeat this 5 times. The engine should start.

IF COLD... For cold weather conditions (below 40°F), flip the Cold Weather Start Lever back up to the run/open position after the unit has started and before squeezing the throttle control.

5.Squeeze the throttle control to warm up the engine for 15 to 30 seconds. In cold weather, let the engine warm up for 30 to 60 seconds.

IF... The engine does not start, go back to step 3.

IF... The engine stops while you are squeezing the throttle, go back to step 4.

STOPPING INSTRUCTIONS

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

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

Stop/ Off (O)

Start/ On (I)

Throttle

Control

	Fig. 10
Cold Weather					Primer Bulb
Start Lever
Run/ Open

Close/ Start

Fig. 11

Starter

Rope

Throttle

Control

Fig. 12

OPERATING INSTRUCTIONS

OPERATING THE RAPID-LINK™ SYSTEM

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

Mach IV® Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AF720 Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AH720 Brushcutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BC720* Blower/ Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BT720 Blower Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BV720 Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720 Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720 Pole Saw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS720 Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS725 Snow Thrower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST720 Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720 *Do NOT use this attachment with an electric powered unit.

Rapid-Link™ Coupler	Release
REMOVING THE CUTTING ATTACHMENT OR ADD-ON	Button

WARNING: Before you begin using any attachment, read and understand the manual that came with the attachment. Follow all safety information contained within.

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

1.Turn the knob counterclockwise to loosen (Fig. 13).

2.Press and hold the release button (Fig. 13).

3.While firmly holding the upper shaft housing, pull the cutting attachment or add-on straight out of the Rapid-Link™ coupler (Fig. 14).

Installing the Cutting Attachment or Add-On

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 (Fig. 13).

2.While firmly holding the add-on, push it straight into the Rapid-Link™ coupler (Fig. 14).

Guide Recess

Fig. 13

Primary Hole

Upper Shaft		Lower Shaft
Housing		Housing
	Fig. 14

NOTE: Aligning the release button with the guide recess will help installation (Fig. 13).

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

CAUTION: Add-ons are to be used in the primary hole only. Using the wrong hole could lead to personal injury or damage to the unit.

3.Turn the knob clockwise to tighten (Fig. 15).

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

For edging (when using the line head cutting attachment with Rapid-Link™ models), lock the release button of the cutting attachment into the 90° edging hole (Fig. 15).

90˚ Edging Hole

(Trimmer Only)

Knob

Fig. 15

HOLDING THE TRIMMER
Before operating the unit, stand in the operating position (Fig. 16).	Fig. 16
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 handle

OPERATING INSTRUCTIONS

•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 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

•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) by working from top to bottom in small increments to avoid premature line wear or engine drag.

•Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side motion. Cutting shorter lengths produces the best results.

•Trim only when grass and weeds are dry.

• The life of your cutting line is dependent upon:

•Proper adherence of explained trimming techniques

•What vegetation is cut

• Where vegetation is cut

For example, the line will wear faster when trimming against a foundation wall as opposed to trimming around a tree.

DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation
around trees, posts, fences and more.	Fig. 17

Rotate the whole unit so that the cutting attachment is at a 30° angle to the ground (Fig. 17).

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.

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.

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.

FREQUENCY	MAINTENANCE REQUIRED	SEE
Before starting engine	Fill fuel tank with fresh fuel	p. 4
	Check oil	p. 6
Every 10 hours	Clean and re-oil air filter	p. 6
1st change at 10 hours	Change oil	p. 6
2nd change at 25 hours	Change oil	p. 6
Every 25 hours after	Clean spark arrestor	p. 7
10 hours on new engine	Check rocker arm to valve clearance and adjust	p. 6
Every 25 hours	Check rocker arm to valve clearance and adjust	p. 6
Every 25 hours	Check spark plug condition and gap	p. 6

FIXED LINE INSTALLATION

Always use original equipment manufacturer 0.105 inch (2.67 mm) replacement line. Lines other than those specified may make the engine overheat or fail.

To install the trimming line:

1. Insert each end of the replacement line into the holes on either side of retention hook (Fig. 18).

2.Push the ends through until they stick out of the sides of

the head (Fig. 19).

	WARNING: Never use metal-reinforced line,	Fig. 18
	wire, chain, or rope. These can break off and
	become dangerous projectiles.
3.	Pull the ends through making sure that the ends are of
	equal length and the middle of the line is centered between
	the insertion holes (Fig. 20).
4.	If the ends are not of equal length, push the longer end
	back through the head part way and pull the shorter end to
	compensate. Repeat until both ends are the same length.
5.	Push the trimmer line until it lies flat against the cutting

Fig. 19

head (Fig. 21). Make sure the two lengths of cutting line are of equal length. If they are not, adjust until they are.

WARNING: Always use the correct line length when installing trimming line on the unit. If the two lengths of cutting line are not of equal length, the unit may develop a vibration.

Fig. 20				Fig. 21

5

MAINTENANCE AND REPAIR INSTRUCTIONS

CHECKING THE OIL LEVEL

WARNING: 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 (Fig. 22).

O-Ring

Oil Fill Plug/Dipstick

Full

Add 1.4-1.5 Oz.

(41-44 ml)

Top of

Dipstick

Fig. 22

Oil Fill

Plug/Dipstick

Oil Fill Hole

6.If the level is low, add a small amount of oil to the oil fill hole and recheck (Fig. 23). Repeat this procedure until the oil level reaches the top of the dipstick.

NOTE: Do not overfill the unit.

NOTE: Make sure the O-ring is in place on the oil fill plug/dipstick when checking and changing the oil (Fig. 22).

CHANGING THE OIL

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

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.

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 (Fig. 24). Allow ample time for complete drainage.

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 3.04 fluid ounce (90 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) (Fig. 25). Check the level with the dipstick. If the level is low, add a small amount of oil and recheck. Do not overfill (Fig. 25).

6.Replace the oil fill plug/dipstick.

7.Reconnect the spark plug boot.

AIR FILTER MAINTENANCE

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

Cleaning the Air Filter

Clean and re-oil the air filter every 10 hours of operation. It is an important item to maintain. Failure to maintain your air filter properly can result in poor performance or can cause permanent damage to your engine.

1.Open the air filter cover. Push the tab on the left side of the cover inward. Then pull the air filter cover out and to the right (Fig. 26).

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

2.Remove the air filter (Fig. 26).

3.Wash the filter in detergent and water (Fig. 27). Rinse the filter thoroughly and allow it to dry.

4.Apply enough clean SAE 30 motor oil to lightly coat the filter (Fig. 28).

5.Squeeze the filter to spread and remove excess oil (Fig. 29).

6.Replace the filter (Fig. 30).

Fig. 23

Fig. 24

Fill Level

Fig. 25

Air Filter

Air Filter Cover

Tab

Fig. 26

Fig. 27

Fig. 28

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

7. Reinstall the air filter cover. Position the hooks on the right side of the air filter cover into the slots at the right side of the back plate (Fig. 31, no.1).

8. Swing the cover to the left until the tab on the air filter cover snaps into place in the slot on the back plate (Fig. 31, no. 2).

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. 32).		Fig. 29
NOTE:	Careless adjustments can seriously damage your	Back Plate
	unit. An authorized service dealer should make
	carburetor adjustments.	Slots
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.

Fig. 30

Clean Air Filter	Air Filter Cover
The condition of the air filter is important to the operation of the
unit. A dirty air filter will restrict air flow. This is often mistaken for
an out of adjustment carburetor. Check the condition of the air
filter before adjusting the idle speed screw. Refer to Air Filter
Maintenance.
Adjust Idle Speed Screw
WARNING: To avoid serious personal injury,
always turn the unit off and allow it to cool	Cover Hinge
before you clean or service it.	Fig. 31

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 (Fig. 32). 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.

ROCKER ARM CLEARANCE

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

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

Idle Ajustment Screw

	Fig. 32
Remove	Remove Screws
Screws	Engine
	Cover

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 five (5) screws on back of the engine cover with a Flat-head or T-20 Torx screwdriver (Fig. 33).

2.Remove the screw behind the engine cover with a Flathead or T-25 Torx screwdriver (Fig. 34).

3.Disconnect the spark plug wire.

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

5.Remove the engine cover (Fig. 33 & 34).

6.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 (Fig. 35). Remove the rocker arm cover and gasket.

7.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. 36)

•Both rocker arms move freely, and both valves are closed If these statements are not true, repeat this step.

Muffler

Fig. 33

Screw

Fig. 34

Rocker Arm Cover

Spark Plug Hole

Fig. 35

	8.	Slide the feeler gauge between the rocker arm and the	Rocker Arms	Adjusting Nuts
		valve return spring. Measure the clearance between the		INTAKE
		valve stem and rocker arm (Fig. 37). 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			EXHAUST
	the rocker arm and valve stem with a slight amount of resistance,		Feeler
	without binding. Figure 38 and 39 show how to measure the
			Gauge
	clearance.			Fig. 36
	9.	If the clearance is not within specification:
			Exhaust	Exhaust
	a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut
			Adjusting Nut	Rocker Arm
		driver (Fig. 37).
				Feeler
		• To increase clearance, turn the adjusting nut
				Gauge
		counterclockwise.

	• To decrease clearance, turn the adjusting nut clockwise.	0.003–0.006 in.
b. Recheck both clearances, and adjust as necessary.		(0.076–0.152 mm)
10.	Reinstall the rocker arm cover using a new gasket. Torque
	the screw to 20–30 in•lb (2.2–3.4 N•m).	Intake Valve	Exhaust Valve
11.	Reinstall the engine cover. Check alignment of the cover	Stem	Stem
	before tightening the screws. Tighten screws.	Fig. 37

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

13.Replace the spark plug wire.

REPLACING THE SPARK PLUG

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

Use a replacement part number 791-180852B spark plug. The correct air gap is 0.025 in. (0.635 mm.). Remove the plug after every 25 hours of operation and check its condition.

1.Stop the engine and allow it to cool. Grasp the plug wire firmly and pull 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.

6