Homelite UT21907, UT21947, UT21506, UT21546 User Manual
OPERATOR’S MANUAL
MightyLite 26cc String Trimmers
(ALL VERSIONS)
MightyLite 26CS
UT21506, UT21907
MightyLite 26SS
UT21546, UT21947
Your trimmer has been engineered and manufactured to our high standard for dependability, ease of operation, and operator
safety. Properly cared for, it will give you years of rugged, trouble-free performance.
WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using
this product.
Thank you for your purchase.
SAVE THIS MANUAL FOR FUTURE REFERENCE
TABLE OF CONTENTS
Introduction ...................................................................................................................................................................... 2
General Safety Rules ........................................................................................................................................................3
Specific Safety Rules .......................................................................................................................................................3
Symbols ........................................................................................................................................................................4-5
Features .........................................................................................................................................................................6-7
Assembly .......................................................................................................................................................................8-9
Operation ...................................................................................................................................................................10-12
Maintenance ..............................................................................................................................................................13-15
Troubleshooting .........................................................................................................................................................16-17
Warranty ....................................................................................................................................................................18-20
Parts Ordering / Service ....................................................................................................................................Back Page
INTRODUCTION
This product has many features for making its use more pleasant and enjoyable. Safety, performance, and dependability
have been given top priority in the design of this product making it easy to maintain and operate.
Page 2
GENERAL SAFETY RULES
WARNING:
Read and understand all instructions. Failure to follow
all instructions listed below may result in electric shock,
fire and/or serious personal injury.
READ ALL INSTRUCTIONS
For safe operation, read and understand all instructions before
using this product. Follow all safety instructions. Failure to
follow all safety instructions listed below, can result in serious personal injury.
Do not allow children or untrained individuals to use this
unit.
Never start or run the engine in a closed or poorly ventilated
area; breathing exhaust fumes can kill.
Clear the work area 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 line or blade.
Wear safety glasses or goggles that are marked to comply
with ANSI Z87.1 standard when operating this product.
Wear heavy, long pants, boots, and gloves. Do not wear
loose fitting clothing, short pants, or go barefoot. Do not
wear jewelry of any kind.
Product users on United States Forest Service land, and in
some states, must comply with fire prevention regulations.
This product is equipped with a spark arrestor; however,
other user requirements may apply. Check with your federal,
state, or local authorities.
Never operate this unit on the operator’s left side.
Secure long hair above shoulder level to prevent entanglement
in moving parts.
Keep all bystanders, children, and pets at least 50 ft. away.
Bystanders should be encouraged to wear eye protection.
Do not operate this unit when you are tired, ill, or under the
influence of alcohol, drugs, or medication.
Do not operate in poor lighting.
Keep firm footing and balance. Do not overreach. Over-
reaching can result in loss of balance or exposure to hot
surfaces. Keep cutting attachment below waist.
To avoid hot surfaces, never operate the unit with the bottom
of the engine above waist level.
Keep all parts of your body away from any moving part.
Do not touch area around the muffler or cylinder of the unit;
these parts get hot from operation.
Always stop the engine and remove the spark plug wire be-
fore making any adjustments or repairs except for carburetor
adjustments.
Inspect the unit before each use for loose fasteners, fuel
leaks, etc. Replace any damaged parts before use.
The string head will rotate during carburetor adjustments.
It has been reported that vibrations from hand-held tools
may contribute to a condition called Raynaud’s Syndrome in
certain individuals. Symptoms may include tingling, numbness, and blanching of the fingers, usually apparent upon
exposure to cold. Hereditary factors, exposure to cold and
dampness, diet, smoking, and work practices are all thought
to contribute to the development of these symptoms. It is
presently unknown what, if any, vibrations or extent of exposure may contribute to the condition. There are measures
that can be taken by the operator to possibly reduce the
effects of vibration:
a) Keep your body warm in cold weather. When operating
the unit wear gloves to keep your hands and wrists
warm. It is reported that cold weather is a major factor
contributing to Raynaud’s Syndrome.
b) After each period of operation, exercise to
increase blood circulation.
c) Take frequent work breaks. Limit the amount of
exposure per day.
d) Keep the product well maintained, fasteners tightened
and worn parts replaced.
If you experience any of the symptoms of this condition,
immediately discontinue use and see your physician about
these symptoms.
Mix and store fuel in a container approved for gasoline. Do
not smoke while fueling or mixing fuel.
Mix fuel outdoors where there are no sparks or flames. Wipe
up any fuel spillage. Move 30 ft. away from refueling site
before starting engine.
Stop the engine and allow to cool before refueling or storing
the unit.
Allow the engine to cool; empty the fuel tank and secure the
unit from moving before transporting in a vehicle.
SPECIFIC SAFETY RULES
Replace string head if cracked, chipped, or damaged
in any way. Be sure the string head or blade is properly
installed and securely fastened. Failure to do so can cause
serious injury.
Make sure all guards, straps, deflectors, and handles are
properly and securely attached.
Use only the manufacturer’s replacement string in the
cutting head. Do not use any other cutting attachment.
Page 3
To install any other brand of cutting head to this string
trimmer can result in serious personal injury.
Never operate unit without the grass deflector in place
and in good condition.
Maintain a firm grip on both handles while trimming. Keep
string head below waist level. Never cut with the string
head located over 30 in. or more above the ground.
SYMBOLS
Some of the following symbols may be used on this product. Please study them and learn their meaning. Proper
interpretation of these symbols will allow you to operate the product better and safer.
SYMBOL NAME EXPLANATION
Safety Alert Symbol Precautions that involve your safety.
Read the Operator’s Manual
Wear Eye and Hearing Protection
Keep Bystanders Away Keep all bystanders at least 50 ft. away.
Ricochet
No Blade
Gasoline and Lubricant
To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Wear eye protection which is marked to comply with ANSI
Z87.1 as well as hearing protection when operating this
equipment.
Thrown objects can ricochet and result in personal injury or
property damage.
Do not install or use any type of blade on a product displaying this symbol.
Use unleaded gasoline intended for motor vehicle use with
an octane rating of 87 [(R + M) / 2] or higher. This product is
powered by a 2-cycle engine and requires pre-mixing gasoline
and 2-cycle lubricant.
Page 4
SYMBOLS
The following signal words and meanings are intended to explain the levels of risk associated with this product.
SYMBOL SIGNAL MEANING
DANGER:
WARNING:
CAUTION:
CAUTION:
Indicates an imminently hazardous situation, which, if not avoided, will result
in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided, could result
in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury.
(Without Safety Alert Symbol) Indicates a situation that may result in property
damage.
SERVICE
Servicing requires extreme care and knowledge and should
be performed only by a qualified service technician. For
service we suggest you return the product to your nearest
AUTHORIZED SERVICE CENTER for repair. When servicing, use only identical replacement parts.
WARNING:
To avoid serious personal injury, do not attempt to use this
product until you read thoroughly and understand completely the operator’s manual. If you do not understand
the warnings and instructions in the operator’s manual,
do not use this product. Call Homelite customer service
for assistance.
WARNING:
The operation of any power tool can result in foreign objects being thrown into your eyes, which can
result in severe eye damage. Before beginning power tool operation, always wear safety goggles or
safety glasses with side shields and, when needed, a full face shield. We recommend Wide Vision Safety
Mask for use over eyeglasses or standard safety glasses with side shields. Always use eye protection
which is marked to comply with ANSI Z87.1.
SAVE THESE INSTRUCTIONS
Page 5
FEATURES
FEATURES
PRODUCT SPECIFICATIONS
Weight (dry)
MightyLite 26CS ...................................................................................................................................................
MightyLite 26SS ....................................................................................................................................................
String cutting width ........................................................................................................................................................17 in.
Engine displacement .......................................................................................................................................................26cc
String diameter ........................................................................................................................................................... .080 in.
7.9 lbs.
8.7 lbs.
MIGHTYLITE 26CS
starter grip
front
handle
drive shaft
housing
single line
string
head
rear
handle
throttle
trigger
curved shaft
grass deflector
engine
switch
handle
primer
choke dial
front
bulb
primer
bulb
starter grip
choke dial
rear
handle
engine
switch
throttle
trigger
dual line
string
head
drive shaft
housing
straight shaft
grass deflector
MIGHTYLITE 26SS
Fig. 1
Page 6
FEATURES
KNOW YOUR STRING TRIMMER
See Figure 1.
The safe use of this product requires an understanding of
the information on the tool and in this operator’s manual as
well as a knowledge of the project you are attempting. Before
use of this product, familiarize yourself with all operating
features and safety rules.
EZ WIND™ TAP ADVANCE SYSTEM
The EZ Wind™ Tap Advance System allows easy line advance
during trimmer operation.
GRASS DEFLECTOR
The trimmer includes a grass deflector that helps protect
you from flying debris.
TOP-MOUNTED MOTOR
The top-mounted motor improves balance and is located
away from the dust and debris of the cutting area.
Page 7
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