Ryobi ZR51950A User Manual
Trimmer/Brushcutter
Model No. ZR51950A—250000001 & Up
Model No. ZR51970A—250000001 & Up
Model No. ZR51990A—250000001 & Up
Operator’s Manual
WARNING:
To reduce the risk of injury, the user must read and understand the operator’s manual. Save this manual.
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READ THIS INFORMATION
Before you use your new trimmer/brushcutter, read the following helpful hints to get you started.
Fueling
DANGER:
Gasoline is extremely ammable and explosive. A
re or explosion from gasoline will burn you and
others.
1. Obtain a clean container that is approved for use with gasoline.
2. Mix all of the 2-cycle oil provided with 1 US gallon of 87-octane, unleaded
gasoline.
3. Fill the trimmer’s gas tank carefully.
Cold Starting vs. Warm Starting
When you restart the trimmer/brushcutter and you are not sure whether the engine is still warm, set
the start lever to RUN (Choke Open) and pull the starter cord. If the engine does not start within 5
pulls, refer to “To Start a Cold Engine” later in this manual.
Flooded Engine
Will the engine start? If not, it may be ooded. Relax, this is easy to correct. Set the start lever to
RUN (Choke Open). Squeeze the trigger and pull the starter cord quickly for 10 to 12 pulls.
If the engine does not start, refer to “Troubleshooting” later in this manual.
WARNING: The engine exhaust from this product contains chemicals known to the State
of California to cause cancer, birth defects, or other reproductive harm.
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Printed in USA
All rights reserved
Table of Contents
Introduction...................................................................................................................................................................................4
Safety Rules .............................................................................................................................................................................. 5-6
Symbols .................................................................................................................................................................................... 6-7
Product Labels ..............................................................................................................................................................................8
Features................................................................................................................................................................................... 9-10
Product Specications ...........................................................................................................................................................9
Assembly................................................................................................................................................................................11-15
Unpacking............................................................................................................................................................................ 11
Connecting the Attachment to the Upper Shaft...................................................................................................................12
Removing the Attachment from the Upper Shaft ................................................................................................................12
Attaching the Front Handle..................................................................................................................................................12
Attaching the Shoulder Strap...............................................................................................................................................12
Attaching the Grass Deector..............................................................................................................................................12
Converting from Brushcutter to Trimmer............................................................................................................................14
Converting from Trimmer to Brushcutter............................................................................................................................15
Operation............................................................................................................................................................................... 16-19
Applications.........................................................................................................................................................................16
Mixing the Fuel....................................................................................................................................................................16
Filling the Tank ....................................................................................................................................................................16
Starting the Product .............................................................................................................................................................17
Stopping the Product............................................................................................................................................................17
Operating the Trimmer ........................................................................................................................................................18
Operating the Brushcutter....................................................................................................................................................19
Maintenance.......................................................................................................................................................................... 20-23
Emissions Maintenance Schedule........................................................................................................................................20
Cleaning the Product............................................................................................................................................................20
Servicing the Product...........................................................................................................................................................20
Replacing the Cutting Line............................................................................................................................................ 20-21
Replacing the Spool.............................................................................................................................................................21
Checking the Fuel Cap.........................................................................................................................................................22
Cleaning the Air Filter .........................................................................................................................................................22
Replacing the Spark Arrester............................................................................................................................................... 22
Replacing the Spark Plug.....................................................................................................................................................23
Storing the Product .............................................................................................................................................................. 23
Transporting the Product......................................................................................................................................................23
Troubleshooting ..........................................................................................................................................................................24
Warranty................................................................................................................................................................................ 25-26
Table of Contents
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Introduction
Thank you for purchasing a Ryobi product.
We would like for you to be completely satised with your new product, so feel free to contact an authorized service dealer
for help with service, genuine Ryobi parts, or other information you may require.
Whenever you contact an authorized service dealer, always know the model and serial numbers of the product. These numbers will help the service representative provide exact information about your specic product. You will nd the model and
serial number decal located on the motor housing.
For your convenience, write the product model and serial numbers in the space below.
Model No.
Serial No.
Model No./Serial No.
Label
Read this manual carefully to learn how to operate and maintain your product correctly. Reading this manual will help you
and others avoid personal injury and damage to the product. Although Ryobi designs, produces, and markets safe, state-ofthe-art products, you are responsible for using the product properly and safely. You are also responsible for training persons
you allow to use the product about safe operation.
The Ryobi warning system in this manual identies potential hazards and has special safety messages that help you and
others avoid personal injury, even death. DANGER, WARNING, and CAUTION are signal words that identify the level of
hazard. However, regardless of the hazard, be extremely careful. Two other words, “Important” and “Note,” highlight information.
Signal Word Explanation
DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor
or moderate injury. It may also be used to alert against unsafe practices that may cause
property damage.
Important Advises you of important information or instructions vital to the operation or maintenance
of the equipment.
Note Advises you of additional information concerning the operation or maintenance of the
equipment.
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Introduction
Safety Rules
WARNING:
Read and understand all instructions. Failure to follow all instructions may result in serious personal
injury as well as damage to the product.
This product has been designed and manufactured to
meet or exceed the requirements of the current version of
ANSI B175.3, safety requirements for gasoline-powered
string trimmers and brushcutters.
■ Physical Condition of the Operator. Do not operate
this product when tired, ill, or under the inuence of
alcohol, drugs, or medication.
■ Clothing Requirements. Always wear long heavy
pants, boots, and gloves. Do not wear loose clothing, jewelry, short pants, sandals, or go barefoot.
Secure hair so that it is above shoulder level to avoid
entanglement in moving parts.
■ Protective Accessories Requirements. Wear eye
protection marked to comply with ANSI Z87.1
standards when operating this product. Wear hearing
protection during extended periods of operation.
■ Condition of Trimmer Before Use. Inspect the
product before each use. Replace damaged parts.
Check for fuel leaks. Make sure all fasteners are
in place and secure. Replace cutting attachment
parts that are cracked, chipped, or damaged in any
way. Make sure the cutting attachment is properly
installed and securely fastened. Be sure the cutting
attachment shield is properly attached, and in the
position recommended by the manufacturer. Use
only exible, non-metallic line recommended by the
manufacturer. For example, never use wire or wirerope, which can break off and become a dangerous
projectile.
■ Proper Stance. Keep rm footing and balance. Do
not overreach. Keep the cutting attachment below
waist level. Keep all parts of your body away from
the rotating cutting attachment and hot surfaces.
■ Exhaust Gases. Never start or run the product inside
a closed room or building; breathing exhaust fumes
can cause illness or death.
■ Fueling. Mix and pour fuel outdoors where there are
no sparks and ames. Slowly remove the fuel cap
only after stopping the engine. Do not smoke while
fueling or mixing fuel. Wipe spilled fuel from the
product. Move at least 30 ft. (9 m) away from the
fueling source and site before starting the engine.
■ Work Area. Clear the area to be cut before each
use. Remove all objects, such as rocks, broken glass,
nails, wire, or string, that can be thrown or become
entangled in the cutting attachment. Clear the area
of children, bystanders, and pets. At a minimum,
keep all children, bystanders, and pets outside a 50
ft. (15 m) radius. Because there still may be a risk of
injury to bystanders from thrown objects, bystanders
should be encouraged to wear eye protection. If you
are approached while operating the product, stop the
engine and the cutting attachment.
■ Dangerous Environments. To avoid falling, do not
use the product in damp or wet locations.
■ Controlling the Product. During carburetor adjustments the cutting attachment may spin. Therefore,
you should wear protective equipment and observe
all safety instructions when adjusting the carburetor. For products equipped with a clutch, be sure the
cutting attachment stops turning when the engine
idles. When the product is turned off, make sure the
cutting attachment has stopped before setting down
the product.
■ Use the Right Product. Use the product for the
intended purpose only.
■ Condition of Brushcutter Before Use. The handles
shall be mounted according to the manufacturer’s
instructions. Do not attach any blade to a product
without proper installation of all required parts. Failure to use the proper parts can cause the blade to y
off and seriously injure the operator and/or bystanders. Discard blades that are bent, warped, cracked,
broken, or damaged in any way.
■ Use the Right Equipment. Always use the barrier
bar on the front handle and the shoulder strap with
the brushcutter.
■ Blade Thrust. Blade thrust may occur when the
spinning blade contacts an object that it does not immediately cut. A blade thrust can be violent enough
to cause the product and/or operator to be propelled
in any direction, and possibly lose control of the
product. Blade thrust can occur without warning if
the blade snags, stalls, or binds. This is more likely
to occur in areas where it is difcult to see the material being cut.
■ Stopping the Product. A coasting blade can cause
injury while it continues to spin after the engine is
stopped or throttle is released. Maintain proper control until the blade has completely stopped rotating.
Safety Rules
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Safety Rules
This engine is equipped with a spark arrester mufer. It is a violation of California Public Resource Code Section
4442 to use or operate this engine without a spark arrester mufer on any forest-covered, brush-covered, or grasscovered land. Other states or federal areas may have similar laws.
This spark ignition system complies with Canadian ICES-002.
Save these instructions. Refer to them frequently and use them to instruct others who may use this product. If you
loan someone this product, loan these instructions also.
Symbols
The following symbols are located on the product. Please study them and learn their meaning. Proper interpretation of these
symbols allows you to operate the product better and safer.
Symbol Name Explanation
Safety Alert Symbol Precautions that involve your safety.
Read the Operator’s Manual Read the operator’s manual before starting or operating this product.
Failure to follow operating instructions and safety precautions in the
operator’s manual can result in serious injury.
Wear Eye and Hearing Protection Wear eye protection which is marked to comply with ANSI Z87.1 as
well as hearing protection when operating this equipment.
Keep Bystanders Away Keep all bystanders at least 50 feet (15 m) away.
Ricochet Thrown objects can ricochet and result in personal injury or property
damage.
No Blade Do not install or use any type of blade on a product displaying this
symbol.
Blade Thrust Beware of blade thrust. Products authorized for blade use will
display this symbol to warn of blade thrust.
Gasoline and Oil 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 oil.
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Symbols
Symbols
The following signal words and meanings are intended to explain the levels of risk associated with this
product.
SYMBOL SIGNAL MEANING
DANGER: Indicates an imminently hazardous situation, which, if not avoided, will
result in death or serious injury.
WARNING: Indicates a potentially hazardous situation, which, if not avoided, could result
in death or serious injury.
CAUTION: Indicates a potentially hazardous situation, which, if not avoided, may result
in minor or moderate injury.
CAUTION: (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 qualied 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:
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
WARNING:
To avoid serious personal injury, do not attempt
to use this product until you read thoroughly and
understand completely the operator’s manual. Save
this operator’s manual and review frequently for
continuing safe operation and instructing others who
may use this product.
Symbols
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Product Labels
50' 15m
50' 15m
50' 15m
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Product labels and instructions are easily visible to the operator and are located near any area of potential danger.
Replace damaged or lost labels.
Part No. 986178-001
Part No. 985102-001
Part No. 984032-001
Part No. 984105-001
OFF ON
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Part No. 983961-001 (Shoulder Strap)Part No. 984240-001
Product Labels
Features
Product Specifications
Engine 25.4 cc Full Crank
Cutting Width
Model No. ZR51950A 17 in.
Model No. ZR51970A 18 in.
Model No. ZR51990A 8 in. for brushcutter, 18 in. for trimmer
Line Size .095 in.
Weight
Model No. ZR51950A 12-1/2 lbs.
Model No. ZR51970A 13-1/2 lbs.
Model No. ZR51990A 13-1/2 lbs.
Know Your Trimmer/Brushcutter
See Figure 1.
Before attempting to use this product, familiarize yourself
with all operating features and safety rules.
Common Features
Engine
The engine is powerful and easy to start. It is effectively
counterbalanced, which allows for less vibration and more
durability.
Ergonomic Design
The design of the product provides for easy handling. It is
designed for comfort and ease of grasp when operating in
different positions and at different angles.
Curved/Straight Shaft Features
(Model No. ZR51950A/ZR51970A)
Dual Line
The dual line permits more efcient cutting than a single
line.
Grass Deflector
The grass deector helps protect you from ying debris.
Brushcutter Features
(Model No. ZR51990A)
Blade
The Tri-Arc® blade allows you to brushcut weeds, vines
and light brush.
Brushcutter Guard
The brushcutter guard helps protect you from the blade and
from ying debris.
Shoulder Strap
The brushcutter includes a shoulder strap that helps support
the product.
Barrier Bar
The handle on the brushcutter contains a barrier bar that
restrains the operator in position and maintains a proper
distance between the operator and the blade.
Features
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