Cub Cadet ST4175 Operator's Manual
769-06532 P00 01/11
Quick Instructions to
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Operator’s Manual
NEED HELP? CALL 1-877-282-8684 IN U.S. OR 1–800–668–1238 IN CANADA
ST4175
4-Cycle Trimmer
Assemble Straight
Shaft String
Trimmers
for complete instructions, refer to the
Assembly Instructions of the unit’s
manual.
Read and understand all instruction, warning and danger labels on the unit.
Quick Instructions
to Start Engine
for complete instructions, refer to the
Starting/ Stopping Instructions of the
unit’s manual.
For cold weather conditions
(below 40ºF) refer to the Starting
and Stopping Instructions section
of this manual.
Place the shield onto the
mount bracket. Securely screw the
2 shield screws through the holes on
the mount bracket and into the
shield. Make sure the screws are
tightened equally so there is a
balanced gap between the bracket
and the shield on each side.
Unleaded
Gasoline
Fill fuel tank with fresh fuel.
Pull starter rope 3 to 5 times or
until engine starts. DO NOT
squeeze throttle control.
Remove the cap from the
boom. Push the bottom add-on
into the coupler. Turn the knob
clockwise to tighten.
Primer
Bulb
Press primer bulb 10x.
Wait 60 seconds
before squeezing the
throttle control.
Loosen the screws and adjust the
J-handle in or out until the arrow/white line
on the decal touches the clamp assembly.
Position the J-handle to the location that
provides the best grip and tighten the
clamp screws evenly until tight.
Crouch in starting
position.
Squeeze the throttle control
and run unit for additional 30
to 60 seconds to complete
warm up. The unit may be
used during this time.
Tip unit so that the back of the engine
is facing up in a vertical position.
Remove the oil fill plug from the
crankcase and pour the entire bottle
of 4-cycle oil into the oil fill hole.
NOTE: Do not mix gas and oil
DO NOT squeeze the
throttle control.
DIDN’T START?
Repeat these instructions.
If unit still fails to start, refer
to the operator’s manual for
additional starting and
troubleshooting information
Quick Instructions to
Replace SplitLine®
Trimmer Line
For replacement line, call
1-877-282-8684 or go to an
authorized service dealer.
For complete line installation,
refer to Line Replacement
replacement section of the
unit’s manual.
IMPORTANT: READ OPERATOR’S MANUAL THOROUGHLY AND FOLLOW THE SAFE OPERATION PRACTICES BEFORE OPERATING THE UNIT.
Insert each end of the
replacement line into the
holes on either side of
retention hook.
Push the ends through
until they stick out of the
sides of the head.
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.
Push the trimmer line
until it lies flat against the
cutting head. Make sure
the two lengths of cutting
line are of equal length.
2
• 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, maintenance, and repair information.
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.
NOTE:
Advises you of information or instructions vital to the operation or maintenance of the equipment.
SYMBOL MEANING
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 grasscovered 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 #753-05444 Muffler Assembly.
READ ALL INSTRUCTIONS BEFORE OPERATING
• Read the instructions carefully. Be familiar with the controls and proper use of the unit.
• Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.
• Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.
• 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.
SAFETY WARNINGS FOR GAS UNITS
• Store fuel only in containers specifically designed and approved for the storage of such materials.
• Always stop the engine and allow it to cool before filling the fuel tank. Never remove the fuel tank cap or
add fuel when the engine is hot. Always loosen the fuel tank cap slowly to relieve any pressure in the tank
before fueling. Do not smoke.
• Always add fuel in a clean, well-ventilated outdoor area where there are no sparks or flames. Do not
smoke.
• Never operate the unit without the fuel cap securely in place.
• Avoid creating a source of ignition for spilled fuel. Wipe up any spilled fuel from the unit immediately
before starting the engine. Move the unit at least 30 feet (9.1 m) from the fueling source and site before
starting the engine. Do not smoke.
• Never start or run the unit inside a closed room or building. Breathing exhaust fumes can kill. Only
operate this unit in a well-ventilated outdoor area.
WHILE OPERATING
• 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.
• 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
• IMPORTANT SAFETY INSTRUCTIONS •
SERVICE INFORMATION
TABLE OF CONTENTS
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Maintenance & Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
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© 2011 MTD SOUTHWEST INC, All Rights Reserved.
For service call 1-877-282-8684 in the United States 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 or
www.cubcadet.ca.
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.
Service on this unit both within and after the warranty period should be performed only by an authorized and
approved service dealer.
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
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.
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.
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.
WARNING:
Gasoline is highly flammable, and its vapors can explode if ignited. Take the
following precautions:
RULES FOR SAFE OPERATION
• SAFETY ALERT SYMBOL
Indicates danger, warning or caution. May be used in conjunction with other symbols
or pictographs.
• 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.
• READ OPERATOR'S MANUAL
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.
• 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.
• THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY
WARNING: Small objects can be propelled at high speed, causing injury. Keep
away from the rotating rotor.
SYMBOL MEANING
• CHOKE CONTROL
1. • FULL choke position
2. • PARTIAL choke position
3. • RUN choke position
• UNLEADED FUEL
Always use clean, fresh unleaded fuel
• OIL
Refer to operator’s manual for the proper type of oil.
• ON/OFF STOP CONTROL
ON / START / RUN
• 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.
• DO NOT USE E85 FUEL IN THIS UNIT
WARNING: It has been proven that fuel containing greater than 10% ethanol will
likely damage this engine and void the warranty.
CALIFORNIA PROPOSITION 65
WARNING:
Engine exhaust, some of its constituents and certain finished components
contain or emit chemicals known to the State of California to cause cancer and birth
defects or other reproductive harm. Wash hands after handling.
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. Tip unit so that the back of the engine is facing up in a vertical position.
3. Remove the oil fill plug 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.
Check oil before each use and change as needed. Refer to Checking the Oil Level.
RECOMMENDED FUEL TYPE
Old fuel is the primary reason for improper unit performance. Be sure to use fresh,
clean, unleaded gasoline.
NOTE: This is a four cycle engine. In order to avoid damage to the unit, do not
mix oil with gasoline.
Definition of Blended Fuels
Today's fuels are often a blend of gasoline and oxygenates such as ethanol, methanol
or MTBE (ether). Alcohol-blended fuel absorbs water. As little as 1% water in the fuel
can make fuel and oil separate or form acids when stored. Use fresh fuel (less than 30
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.
FUELING THE UNIT
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.
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 with federal, state and local regulations.
3
KNOW YOUR UNIT
APPLICATIONS
As a trimmer:
• Cutting grass and light weeds.
• Edging
• Decorative trimming around trees,
fences, etc.
Other optional accessories may be used
with this unit.
Throttle
Control
J-Handle
Shaft Grip
Air Filter/Muffler
Cover
Spark Plug
Shaft Housing
Starter Rope Grip
Line
Cutting
Blade
Muffler
On/Off Control
Cutting Head
Cutting Head Shield
Fuel Cap
Rapid-Link®
OIL AND FUEL INFORMATION
INSTALL CUTTING ATTACHMENT SHIELD
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.
1. Place the cutting head shield onto the guard
mount bracket, making sure to align the holes
on the shield with the holes in the guard mount
bracket. (Fig. 1)
2. Take the 2 shield screws and screw each one
into the shield until finger tight.
3. Using an appropriate screw driver, tighten the
screws until the shield is firmly in place. Make
sure the screws are tightened equally so there is
a balanced gap between the bracket and the
shield on each side.
INSTALL AND ADJUST THE J-HANDLE
1. Place the J-handle between the top and middle clamp pieces (Fig. 2).
2. While holding the 3 pieces together, install the 4 screws through the top clamp and into middle clamp.
NOTE: The holes in the top and middle clamp will line up only when assembled correctly.
3. Place the clamps and the J-handle over the shaft housing and onto the bottom clamp.
4. Hold each hex nut in the bottom clamp recess with a finger. Start screws with a large Phillips screwdriver. Do not
tighten until making the handle adjustment.
5. Slide the J-handle in or out until the arrow/white line on the decal touches the clamp assembly (Fig. 2). You must
first loosen the screws if the handle is pre-installed.
6. While holding the unit in the operating position (Fig. 13), position the J-handle to the location that provides you the
best grip.
7. Tighten the clamp screws evenly until tight.
OPERATING THE RAPID-LINK® SYSTEM
The Rapid-Link® system enables the use of these optional Add-Ons.
Trimmer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AF720
Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AH720*
Brushcutter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BC720*
Bladed Pruner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BP720
Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720
Lawn Dethatcher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LD720
Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720*
Pole Saw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS720
Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS725
Turbo Blower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720
* Do NOT use this Add-On with an electric powered unit.
REMOVING THE ADD-ON
1. Turn the knob counterclockwise to loosen (Fig. 5).
2. Press and hold the release button (Fig. 3).
3. While firmly holding the upper shaft housing,
pull the lower shaft housing straight out of the
Rapid-Link® coupler (Fig. 4).
INSTALLING THE ADD-ON
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. 5).
2. While firmly holding the add-on, push it straight into the Rapid-Link® coupler (Fig. 4).
NOTE: Aligning the release button with the guide recess will help installation (Fig. 3).
3. Turn the knob clockwise to tighten (Fig. 5).
For decorative trimming/edging with the line cutting head, lock the release button
into the 90° hole (Fig. 5).
ASSEMBLY INSTRUCTIONS
Guide Recess
Fig. 3
Release Button
Rapid-Link®
Coupler
Upper Shaft
Housing
Fig. 4
Lower Shaft
Housing
Primary Hole
Knob
Fig. 5
90˚ Edging Hole
(Trimmer Only)
STARTING/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. 12). To avoid serious
injury, the operator and unit must be in a stable position while starting.
OPERATING INSTRUCTIONS
HOLDING THE TRIMMER
Before operating the unit, stand in the operating position (Fig. 13). Check for the following:
• The operator is wearing eye protection and proper clothing
• With a slightly-bent right arm, the operator’s hand is holding the shaft grip
• The operator’s left arm is straight, the left hand holding the J-handle
• The unit is at waist level
• The cutting head is parallel to the ground and easily contacts the grass without the need to bend over
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting head parallel to the ground.
• Do not force the cutting head. Allow the tip of the line to do the cutting, especially along walls. Cutting with more
than the tip will reduce cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear
or engine drag.
• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are thrown
away from the operator.
• Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or
side-to-side motion. Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon:
• Following the trimming techniques
• What vegetation is being cut
• Where vegetation is cut
For example, the line will wear faster when trimming against a foundation wall as
opposed to trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts,
fences and more.
Rotate the whole unit so that the cutting head is at a 30° angle to the ground (Fig. 14).
WARNING:
Always wear eye, hearing, foot and body protection to
reduce the risk of injury when operating this unit.
Fig. 13
WARNING:
To prevent serious personal injury, never operate the trimmer without the cutting
attachment shield in place.
Cutting
Head
Shield
Screw (2)
Guard
Mount
Bracket
Fig. 1
J-Handle
Screws (4)
Fig. 2
Oil Fill Plug
Cold Weather
Start Lever
Primer
Bulb
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.
Funnel
Spout
Fig. 6
Fig. 7
Gas Can Spout
Fig. 9
WARNING:
Remove fuel cap slowly to avoid injury from fuel spray.
Never operate the unit without the fuel cap securely in place.
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.
Fig. 8
Oil Fill
Plug
O-Ring
Oil Fill
Hole
Fuel Tank
Fuel Cap
Top
Clamp
Middle
Clamp
Bottom
Clamp
Nuts
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 Control is in the ON ( I )
position at all times (Fig. 10).
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.
3. 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 fuel can not be seen
in the bulb, press and release the bulb until fuel is visible.
4. With the unit in the starting position, do not squeeze the throttle control (Fig. 12).
With a controlled and steady motion, pull the starter rope 3 to 5 times or until
engine starts.
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. Wait 60 seconds and then squeeze the throttle control.
6. Continue squeezing the throttle control for an additional 30 to 60 seconds to let
the engine warm up. The unit may be used during this time.
IF... The engine does not start, go back to step 3.
IF... The engine stops while squeezing the throttle control, go back to step 4.
STOPPING INSTRUCTIONS
1. Release your hand from the throttle control. Allow the engine to cool down by idling.
2. Press and hold the On/Off Control switch in the OFF (O) position until the unit comes to a complete stop (Fig. 10).
OFF (O)
ON (I)
Throttle
Control
Fig. 10
Starter
Rope
Starting Position
Throttle
Control
Fig. 12
Fig. 11
Primer Bulb
Cold Weather
Start Lever
Run/ Open
Close/ Start
WARNING:
DO NOT USE E85 FUEL IN THIS UNIT. It has been
proven that fuel containing greater than 10% ethanol will likely
damage this engine and void the warranty.
Tools Required:
• #2 Phillips screwdriver
• Large Phillips screwdriver
OIL AND FUEL INFORMATION
WARNING:
Overfilling oil crankcase may cause serious personal injury. Check and maintain the
proper oil level in the crank case; it is important and cannot be overemphasized. Check the oil before
each use and change it as needed. See Changing the Oil.
Fig. 14
CAUSE ACTION
4
ROCKER ARM CLEARANCE
This service requires disassembly of the engine. If
feeling unsure or unqualified to perform this service,
take the unit to an authorized service center.
• 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 with a Flat-head or
T-20 Torx screwdriver and the one T-25 screw
(Fig. 26).
2. Disconnect the spark plug wire.
3. Clean dirt from around the spark plug. Remove
the spark plug from the cylinder head by
turning a 5/8 in. socket counterclockwise.
4. Remove the engine cover (Fig. 26).
5. 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. 27). Remove the rocker arm cover
and gasket.
6. 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. 27).
• Both rocker arms move freely, and both valves are closed.
If these statements are not true, repeat this step.
7. Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the
valve stem and rocker arm (Fig. 28). Measure both the intake and exhaust valves.
The recommended clearance for both intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard
automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem
with a slight amount of resistance, without binding. See Figures 28 and 29.
8. If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 29).
• To increase clearance, turn the adjusting nut counterclockwise.
• To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances and adjust as necessary.
9. Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m).
10. Check the spark plug and reinstall. See Replacing the Spark Plug.
11. Replace the spark plug wire.
12. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.
REPLACING THE SPARK PLUG
Use a replacement part number 791-180852 spark plug. The correct air gap is 0.025 in. (0.635 mm).
1. Stop the engine and allow it to cool. Remove the five (5) screws with a Flat-head or T-20 Torx screwdriver and the
one T-25 screw (Fig. 26).
2. Grasp the plug wire firmly and pull the cap from the spark plug.
3. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket
counterclockwise.
4. Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm.)
using a feeler gauge (Fig. 30).
5. Install a correctly-gapped spark plug in the cylinder head. Turn 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.
CLEANING
Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain
aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off
any moisture with a soft cloth.
STORAGE
• Never store the unit with fuel in the tank where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
Short Term Storage (1-2 weeks)
1. Store the unit in a horizontal position. If this is not possible, store the unit vertically with the engine at the top.
Long Term Storage
1. Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more than 30 days.
Dispose of the old gasoline in accordance with federal, state and local regulations.
2. Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 5 drops 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, referring to Changing the Oil. Dispose of the old oil in accordance with 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.
MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be
a part of any seasonal tune-up.
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures
take your unit to any non-road engine repair establishment, individual or authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any
non-road engine repair establishment, individual or authorized service dealer.
NOTE: Please read the California/EPA statement that came with the unit for a complete listing of terms and
coverage for the emissions control devices, such as the spark arrestor, muffler, carburetor, etc.
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.
MAINTENANCE AND REPAIR INSTRUCTIONS
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. 15).
2. Push the ends through until they stick out of
the sides of the head (Fig. 16).
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. 17).
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 head (Fig. 18). Make sure the two
lengths of cutting line are of equal length. If
they are not, adjust until they are.
CHECKING THE OIL LEVEL
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 (Fig. 22).
3. Keep dirt, grass clippings and other debris out
of the engine. Clean the area around the
dipstick before removing it.
4. Remove the oil fill plug/dipstick and wipe off oil. Reinsert it all the way back in. (Fig. 20)
5. Remove the oil fill plug/ dipstick and check the oil level. Oil should be up to the top of the dipstick (Fig. 19).
6. If the level is low, add a small amount of oil to the oil fill hole and recheck (Fig. 20). 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. 19).
CHANGING THE OIL
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. 21). 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 fl.oz. (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
3.04 ounces (90 ml) (Fig. 23). Check the level with the dipstick. If the level
is low, add a small amount of oil and recheck. Do not overfill (Fig. 20).
6. Replace the oil fill plug/dipstick.
7. Reconnect the spark plug boot.
AIR FILTER MAINTENANCE
Cleaning the Air Filter
Failure to maintain your air filter properly can result in poor performance or can cause
permanent damage to your engine.
1. Open the air filter cover. Push the tab on the left side of the cover inward. Then
pull the air filter cover out and to the right (Fig. 24).
NOTE:
It may be necessary to remove the fuel cap to completely remove the air
filter cover.
2. Remove the air filter (Fig. 24).
3. Wash the filter in detergent and water. Rinse the filter thoroughly and allow it to dry.
4. Apply enough clean SAE 30 motor oil to lightly coat the filter.
5. Squeeze the filter to spread and remove excess oil.
6. Replace the filter (Fig. 24).
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. 24).
NOTE: It may be necessary to remove the fuel cap to completely replace the air filter cover.
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. 24).
9. Replace the fuel cap if you have removed it.
IDLE SPEED ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjustment screw is between the
air filter cover and the engine starter housing (Fig. 25).
NOTE: Careless adjustments can seriously damage your unit. An authorized
service dealer should make carburetor adjustments.
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 screwdriver in between the Air Filter Cover and the Engine Cover
(Fig. 25). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.
NOTE: The cutting attachment should not rotate when the engine idles.
3. If the cutting attachment rotates when the engine idles, turn the idle speed screw counterclockwise 1/8 of a turn at
a time (as needed), to reduce idle speed.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all
of the following are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
WARNING:
To prevent extensive engine wear and damage to the unit, always maintain the proper oil
level in the crankcase. Never operate the unit with a low oil level.
CAUTION:
Wear gloves to prevent injury when handling the unit.
Fig. 19
Fig. 20
Oil Fill Plug/ Dipstick
Oil Fill
Plug
O-Ring
Fig. 21
Oil Fill
Hole
Fig. 24
Air Filter Cover
Air Filter
Ta b
WARNING:
The cutting attachment may spin during idle speed adjustments. Wear protective clothing
and observe all safety instructions to prevent serious personal injury.
Fig. 25
Idle Adjustment Screw
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before
cleaning or servicing it.
WARNING: Do not sand blast, scrape or clean electrodes. Grit in the
engine could damage the cylinder.
Fig. 30
0.025 in.
(0.635 mm.)
Old fuel (over 30 days) Drain fuel tank and add fresh fuel
Fouled spark plug Replace or clean the spark plug
Old fuel (over 30 days) Drain fuel tank and add fresh fuel
Cutting attachment bound with grass Stop the engine and clean the cutting attachment
Dirty air filter Clean or replace the air filter
TROUBLESHOOTING
Empty fuel tank Fill fuel tank with fuel
Primer bulb wasn't pressed enough Press primer bulb fully and slowly 10 times
Old fuel (over 30 days) Drain fuel tank and add fresh fuel
Fouled spark plug Replace or clean the spark plug
Air filter is plugged Replace or clean the air filter
Old fuel (over 30 days) Drain fuel tank and add fresh fuel
Improper idle speed Adjust according to the Idle Speed Adjustment section
ENGINE WILL NOT START
ENGINE WILL NOT ACCELERATE
ENGINE WILL NOT IDLE
If further assistance is required, contact an authorized service dealer.
ENGINE LACKS POWER OR STALLS WHEN CUTTING
UNIT*
Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 4-Cycle
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 cu. in. (26.2 cc)
Clutch Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrifugal
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,200+ rpm
Idle Speed RPM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,600 rpm
Valve clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.003–0.006 in. (0.076–0.152 mm)
Spark Plug Gap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 inch (0.635 mm)
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAE 30 Oil
Crankcase Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.04 oz (90 ml)
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unleaded
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 oz (532 ml)
Approximate Unit Weight (No fuel, with handle, shield and cutting attachment) . . . . . . . . . . . . . . . . . . . 14.5 lbs (6.5 kg)
Trimming Line Diameter:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.105 inches (2.67 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 in. (43.18 cm.)
SPECIFICATIONS
*All specifications are based on the latest product information available at the time of printing. We reserve the right to
make changes at any time without notice.
WARNING:
Never use metal-reinforced line, wire, chain or rope. These can break off and become
dangerous projectiles.
Fig. 22
Fig. 23
Fill Line
Fig. 26
View Of The Rear Engine Cover
Fig. 27
Rocker Arm
Cover
Fig. 28
Adjustment
Nuts
Intake
Exhaust
Rocker
Arms
Spark
Plug Hole
Valve Stem
Fig. 29
Feeler
Gauge
0.003–0.006 in.
(0.076–0.152 mm)
Screws
Screws
O-Ring
Full
Add 1.4-
1.5 oz.
(41-44 ml)
T-25 Screws
Fig. 16
Fig. 15
Fig. 17
Fig. 18
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.
FREQUENCY MAINTENANCE REQUIRED SEE
Every 10 hours Clean and oil air filter p. 4
Change 1st 10 hours Change oil p. 4
Every 25 hours
Change oil
Check rocker arm to valve clearance and adjust
Check spark plug condition and gap
p. 4
p. 4
p. 4
769-06532 P00 01/11
Instructions rapides
Español — Page 11 English — Page 1Français — Page 5
Manuel de l’utilisateur
BESOIN D’AIDE ? POUR VOS QUESTIONS, APPELEZ LE 1-877-282-8684
AUX ÉTATS-UNIS OU LE 1–800–668–1238 AU CANADA
ST4175
Taille-bordures
4 temps
pour le montage des
taille-bordures à
arbre droit
Pour des instructions plus détaillées,
veuillez consulter les instructions de
montage du manuel de l’appareil.
Read and understand all instruction, warning and danger labels on the unit.
Instructions rapides
pour le démarrage
du moteur
Pour des instructions plus détaillées,
veuillez consulter les instructions de
démarrage/arrêt du manuel de
l’appareil.
Pour une utilisation par temps froid
(température inférieure à 4ºC/40°F),
veuillez consulter les instructions de
démarrage/arrêt du manuel.
Placez l’écran de protection sur le
support de montage. Vissez fermement
les 2 vis d’écran à travers les trous du
support de montage jusque dans l’écran.
Assurez-vous que le degré de serrage soit
le même pour les deux vis afin d’avoir le
même espacement entre le support et
l’écran de chaque côté.
Essence
sans plomb
Remplissez le réservoir de
carburant récent.
Tirez de 3 à 5 fois sur le cordon
de démarrage, jusqu’au
démarrage de l’appareil. NE
PRESSEZ PAS la commande
des gaz.
Retirez le capuchon du
manche. Insérez la tige
d’extension inférieure dans le
coupleur. Tournez le bouton
dans le sens des aiguilles d’une
montre pour resserrer.
Poire
d'amorçage
Appuyez 10x sur la
poire d’amorçage.
Attendez 60 secondes
avant de presser la
commande des gaz.
Desserrez les vis et réglez la poignée en
forme de J en la déplaçant d’avant en
arrière jusqu’à ce que la flèche/ligne
blanche touche le système de serrage.
Positionnez la poignée en forme de J de
manière à permettre la meilleure prise et
serrez bien toutes les vis.
Vous devez être en position
accroupie pour démarrer.
Pressez la commande des gaz
et faites tourner l’appareil
encore 30 à 60 secondes pour
le réchauffer. Vous pouvez déjà
l’utiliser pendant ce temps.
Retournez l’appareil pour placer l’arrière
du moteur vers le haut en position
verticale. Enlevez le bouchon de
remplissage d’huile du carter et versez tout
le contenu de la bouteille d’huile 4 temps
dans l’orifice de remplissage d’huile.
REMARQUE : Ne pas mélanger l’essence
et l’huile
NE PRESSEZ PAS la
commande des gaz.
S’IL NE DÉMARRE PAS
Suivez à nouveau ces instructions.
Si l’appareil ne démarre toujours pas,
veuillez consulter le manuel de
l’utilisateur pour plus d’informations de
démarrage et de résolution des problèmes
Instructions
rapides pour le
remplacement du
SplitLine® fil de
coupe
Pour vous procurer du fil de rechange,
téléphonez au 1-877-282-8684
ou rendez-vous chez un distributeur
agréé.
Pour l’installation détaillée, veuillez
consulter la section Remplacement du
fil de coupe du manuel de l’appareil.
IMPORTANT : LISEZ ATTENTIVEMENT LE MANUEL DE L’UTILISATEUR ET SUIVEZ LES INSTRUCTIONS POUR UNE UTILISATION EN TOUTE SÉCURITÉ
AVANT D’UTILISER L’APPAREIL.
Insérez chaque extrémité
du fil de rechange dans
les trous des deux côtés
du crochet de retenue.
Poussez-les jusqu’à ce
qu’elles ressortent des
côtés de la tête.
Tirez sur ces extrémités en
vous assurant qu’elles sont
de même longueur et que le
milieu du fil est centré entre
les trous d’insertion.
Poussez le fil de coupe
pour qu’il se trouve à plat
contre la tête de coupe.
Assurez-vous que les
deux longueurs de fil de
coupe sont égales.
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