Ryobi D550H Operator`s manual

OPERATOR'S MANUAL

HAMMER DRILL - 1/2 in. (13 mm)

D550H

VARIABLE SPEED – DOUBLE INSULATED

Your new hammer drill has been engineered and manufactured to Ryobi's 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.

Thank you again for buying a Ryobi hammer drill.

SAVE THIS MANUAL FOR FUTURE REFERENCE

TABLE OF CONTENTS

■ Introduction ........................................................................................................................................................ 2

■ General Safety Rules .....................................................................................................................................3-4

■ Specific Safety Rules ......................................................................................................................................... 4

■ Symbols ............................................................................................................................................................. 5

■ Specifications .................................................................................................................................................... 6

■ Unpacking .......................................................................................................................................................... 6

■ Applications ....................................................................................................................................................... 6

■ Features .........................................................................................................................................................7-8

■ Operation ......................................................................................................................................................9-13

■ Maintenance ...............................................................................................................................................13-14

■ Parts, Ordering, and Service ........................................................................................................................... 16

INTRODUCTION

Your hammer drill has many features for making the use of this tool more pleasant and enjoyable. Safety, performance, and dependability have been given top priority in the design of this hammer drill making it easy to maintain and operate.

WARNING:

Do not attempt to use this tool until you have read thoroughly and understand completely the operator’s manual. Pay close attention to the safety rules, including Dangers, Warnings, and Cautions. If you use your tool properly and only for what it is intended, you will enjoy years of safe, reliable service.

WEAR YOUR

SAFETY GLASSES

FORESIGHT IS BETTER

THAN NO SIGHT

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 tool operation, always wear safety goggles or safety glasses with side shields and a full face shield when needed. We recommend Wide Vision Safety Mask for use over eyeglasses or standard safety glasses with side shields. Always wear eye protection which is marked to comply with ANSI Z87.1.

Look for this symbol to point out important safety precautions. It means attention!!! Your safety is involved.

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.

SAVE THESE INSTRUCTIONS

WORK AREA

■ Keep your work area clean and well lit. Cluttered benches and dark areas invite accidents.

■ Do not operate power tools in explosive atmo- spheres, such as in the presence of flammable

liquids, gases, or dust. Power tools may create sparks which may ignite the dust or fumes.

■ Keep bystanders, children, and visitors away

while operating a power tool. Distractions can cause you to lose control.

ELECTRICAL SAFETY

■ Double insulated tools are equipped with a po- larized plug (one blade is wider than the other).

This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install a polarized outlet.

Do not change the plug in any way. Double insulation eliminates the need for the three-wire grounded power cord and grounded power supply system.

■ Avoid body contact with grounded surfaces, such as pipes, radiators, ranges, and refrigera-

tors. There is an increased risk of electric shock if your body is grounded.

■ Don’t expose power tools to rain or wet condi-

tions. Water entering a power tool will increase the risk of electric shock.

■ Do not abuse the cord. Never use the cord to carry the tools or pull the plug from an outlet.

Keep cord away from heat, oil, sharp edges, or moving parts. Replace damaged cords immedi-

ately. Damaged cords increase the risk of electric shock.

■ When operating a power tool outside, use an outdoor extension cord marked “W-A” or “W”.

These cords are rated for outdoor use and reduce the risk of electric shock.

PERSONAL SAFETY

■ Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use tool while tired or under the influence of

drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.

■ Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep your hair, cloth-

ing, and gloves away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts or drawn into air vents.

■ Avoid accidental starting. Be sure switch is off

before plugging in. Carrying tools with your finger on the switch or plugging in tools that have the switch on, invites accidents.

■ Remove adjusting keys or wrenches before turn-

ing the tool on. A wrench or a key that is left attached to a rotating part of the tool may result in personal injury.

■ Do not overreach. Keep proper footing and bal-

ance at all times. Proper footing and balance enables better control of the tool in unexpected situations. Do not use on a ladder or unstable support.

■ Use safety equipment. Always wear eye protec-

tion. Dust mask, nonskid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.

TOOL USE AND CARE

■ Use clamps or other practical way to secure and

support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control.

■ Do not force tool. Use the correct tool for your

application. The correct tool will do the job better and safer at the rate for which it is designed.

■ Do not use tool if switch does not turn it on or

off. Any tool that cannot be controlled with the switch is dangerous and must be repaired.

■ Disconnect the plug from power source before making any adjustments, changing accessories,

or storing the tool. Such preventive safety measures reduce the risk of starting the tool accidentally.

■ Store idle tools out of the reach of children and

other untrained persons. Tools are dangerous in the hands of untrained users.

■ Maintain tools with care. Keep cutting tools sharp

and clean. Properly maintained tools with sharp cutting edges are less likely to bind and are easier to control.

■ Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the tool’s operation. If dam-

aged, have the tool serviced before using. Many accidents are caused by poorly maintained tools.

■ Use only accessories that are recommended by

the manufacturer for your model. Accessories that may be suitable for one tool, may become hazardous when used on another tool.

3

GENERAL SAFETY RULES

SERVICE

■ Tool service must be performed only by quali-

fied repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury.

■ When servicing a tool, use only identical replace- ment parts. Follow instructions in the Mainte-

nance section of this manual. Use of unauthorized parts or failure to follow Maintenance Instructions may create a risk of electric shock or injury.

SPECIFIC SAFETY RULES

Hold tool by insulated gripping surfaces when performing an operation where the cutting tool may contact

hidden wiring or its cord. Contact with a “live” wire will make exposed metal parts of the tool “live” and shock the operator.

ADDITIONAL SAFETY RULES

■ Know your power tool. Read operator’s manual carefully. Learn its applications and limitations, as well as the specific potential hazards related

to this tool. Following this rule will reduce the risk of electric shock, fire, or serious injury.

■ Always wear safety glasses. Everyday eye- glasses have only impact-resistant lenses; they

are NOT safety glasses. Following this rule will reduce the risk of serious personal injury.

■ Protect your lungs. Wear a face or dust mask if

the operation is dusty. Following this rule will reduce the risk of serious personal injury.

■ Protect your hearing. Wear hearing protection

during extended periods of operation. Following this rule will reduce the risk of serious personal injury.

■ Inspect tool cords periodically and, if damaged, have repaired at your nearest authorized service center. Constantly stay aware of cord location.

Following this rule will reduce the risk of electric shock or fire.

■ Check damaged parts. Before further use of the tool, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting, and any other conditions that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced by an

authorized service center. Following this rule will reduce the risk of shock, fire, or serious injury.

■ Do not abuse cord. Never carry the tool by the cord or yank it to disconnect it from the receptacle. Keep cord away from heat, oil, and sharp

edges. Following this rule will reduce the risk of electric shock or fire.

■ Make sure your extension cord is in good condi- tion. When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. A wire gage size (A.W.G.) of at least 16 is recommended for an extension cord

100 feet or less in length. A cord exceeding 100 feet is not recommended. If in doubt, use the next heavier gage. The smaller the gage number, the

heavier the cord. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating.

■ Inspect for and remove all nails from lumber be-

fore using this tool. Following this rule will reduce the risk of serious personal injury.

■ Drugs, alcohol, medication. Do not operate tool while under the influence of drugs, alcohol, or

any medication. Following this rule will reduce the risk of electric shock, fire, or serious personal injury.

■ Save these instructions. Refer to them frequently and use them to instruct others who may use this tool. If you loan someone this tool, loan them these instructions also.

WARNING:

Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

• lead from lead-based paints,

• crystalline silica from bricks and cement

and other masonry products, and

• arsenic and chromium from chemically-

treated lumber.

Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.

4

SYMBOLS

Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning.

Proper interpretation of these symbols will allow you to operate the tool better and safer.

SYMBOL NAME DESIGNATION/EXPLANATION

V Volts Voltage

A Amperes Current

Hz

W

min

Hertz

Watt

Frequency (cycles per second)

Power

Minutes Time

Alternating Current Type or a characteristic of current

n

0

No Load Speed

Class II Construction

.../min Revolutions or Reciprocation Per Minute

Safety Alert

Wet Conditions Alert

Rotational speed, at no load

Designates double-insulated construction tools

Revolutions, strokes, surface speed, orbits etc. per minute

Indicates danger, warning or caution.

It means attention!!! Your safety is involved.

Do not expose to rain or use in damp locations.

The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols, and the explanations with them, 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.

SYMBOL MEANING

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 serious injury to yourself or to 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.

NOTE:

Advises you of information or instructions vital to the operation or maintenance of the equipment.

SAVE THESE INSTRUCTIONS

5

Chuck Capacity

Hammer Speed

No Load Speed

Input

Net Weight

* BPM = Blows Per Minute

SPECIFICATIONS

5/64 in. (2 mm) - 1/2 in. (12.7 mm)

Low (0-16,000 BPM*) & High (0 - 48,000 BPM*)

Low (0 - 1,000/min) & High (0 - 3,000/min)

120 Volts, 60 Hz, AC only, 5.5 Amps

5.75 lbs. (2.6 kg)

INSTRUCTIONS

Your hammer drill has been shipped completely assembled.

■ Carefully remove the tool from the box. Make sure that all items listed in the packing list are included.

■ Inspect the tool carefully to make sure no breakage or damage occurred during shipping.

■ Do not discard the packing material until you have carefully inspected and satisfactorily operated the tool.

■ If any parts are damaged or missing, please call

1-800-525-2579 for assistance.

UNPACKING

PACKING LIST

Hammer Drill

Carrying Case

Operator’s Manual

WARNING:

If any parts are missing do not operate your tool until the missing parts are replaced. Failure to do so could result in possible serious personal injury.

APPLICATIONS

You may use your hammer drill for the purposes listed below:

■ Hammer drilling in concrete, brick, or other masonry.

■ Drilling in wood.

■ Drilling in ceramics, plastics, fiberglass, and laminates.

■ Drilling in both soft and hard metals.

■ Using driving accessories, such as driving screws with screwdriver bits.

■ Mixing paint.

6

FEATURES

DOUBLE INSULATION

Double insulation is a concept in safety in electric power tools, which eliminates the need for the usual three-wire grounded power cord. All exposed metal parts are isolated from the internal metal motor components with protecting insulation. Double insulated tools do not need to be grounded.

WARNING:

The double insulated system is intended to protect the user from shock resulting from a break in the tool's internal wiring. Observe all normal safety precautions to avoid electrical shock.

Important: Servicing of a tool with double insulation requires extreme care and knowledge of the system and should be performed only by a qualified service technician. For service, we suggest you return the tool to your nearest authorized service center for repair. Always use original factory replacement parts when servicing.

ELECTRIC MOTOR

Your hammer drill has a precision built electric motor. It should be connected to a power supply that is 120

volts, 60 Hz, AC only (normal household current). Do not operate this tool on direct current (DC). A substantial voltage drop will cause a loss of power and the motor will overheat. If your tool does not operate when plugged into an outlet, double-check the power supply.

SWITCH

Your hammer drill has a conveniently located trigger switch.

LOCK-ON

The hammer drill contains a lock-on feature that allows you to lock the drill on when you operate it continuously for extended periods of time.

VARIABLE SPEED

This tool has a variable speed switch that delivers higher speed with increased trigger pressure. Speed is controlled by the amount of switch trigger depression.

REVERSIBLE

This hammer drill allows you to reverse the drill rotation.

You can control the direction of the chuck with a lever located above the switch trigger.

DRILL MODE

You can change the drill mode depending on the type of material in which you are drilling.

DEPTH GAUGE ROD

A depth gauge rod is installed on the hammer drill to assist you in controlling the depth of drilled holes.

CHUCK KEY

A chuck key is provided for use when installing or removing bits. It is also used when removing the chuck.

AUXILIARY HANDLE

An auxiliary handle is installed on the hammer drill. For ease of operation, you may use the handle with either the left hand or the right hand.

ERGONOMIC DESIGN

The design of the hammer drill provides for easy handling.

It is designed for comfort and ease of grasp when operating in different positions and at different angles.

7

DEPTH

GAUGE ROD

FEATURES

MODE

SELECTOR

LOCK-ON

BUTTON

HANDLE

ASSEMBLY

SWITCH

TRIGGER

CHUCK

Fig. 1

WARNING:

Do not attempt to modify this tool or create accessories not recommended for use with this tool. Any such alteration or modification is misuse and could result in a hazardous condition leading to possible serious personal injury.

8

OPERATION

WARNING:

Always wear safety goggles or safety glasses with side shields when operating this tool. Failure to do so could result in dust, shavings, or loose particles being thrown into your eyes, resulting in possible serious injury.

INSERTING BITS

See Figure 2.

Follow these directions to insert bits.

■ Unplug the hammer drill.

WARNING:

Failure to unplug the tool could result in accidental starting causing possible serious injury.

■ Position the chuck jaws so that the opening is slightly larger than the drill bit you intend to use.

NOTE: To open the chuck jaws, turn the chuck collar counterclockwise. To close the chuck jaws, turn the chuck collar clockwise.

■ Raise the front of the drill to keep the drill bit from falling out of the chuck jaws.

WARNING:

Do not insert a drill bit into the chuck jaws and tighten as shown in Figure 3. This could cause the drill bit to be thrown from the drill resulting possible serious injury or damage to the chuck.

■ Insert the drill bit completely into the chuck.

■ Tighten the chuck jaws securely on the drill bit using the chuck key provided. Do not use a wrench to tighten or loosen the chuck jaws.

REMOVING BITS

Follow these directions to remove bits.


WARNING:


■ Loosen the chuck jaws using the chuck key provided.

■ Remove the drill bit from the chuck jaws.

CHUCK JAWS

DRILL BIT

WRONG

CHUCK COLLAR

RIGHT

Fig. 2

Fig. 3

9

OPERATION

ADJUSTING THE HANDLE ASSEMBLY

See Figure 4.

Follow these directions to adjust the handle assembly.


WARNING:


■ Loosen the handle assembly by turning the handle counterclockwise.

■ Remove the handle from the drill.

■ Rotate the handle assembly and place it on the opposite side.

■ Tighten the handle assembly securely by turning the handle clockwise.

ADJUSTING THE DEPTH GAUGE ROD

See Figure 5.

Follow these directions to adjust the depth gauge rod.


WARNING:


■ Loosen the handle assembly by turning the handle counterclockwise.

■ Adjust the depth gauge rod so that the drill bit extends beyond the end of the rod to the required drilling depth.

■ Tighten the handle assembly by turning the handle clockwise.

ADJUSTING THE DRILL MODE

See Figure 6.

Adjust the drill mode when necessary. We recommend that you use carbide-tipped bits and select hammer mode when drilling in hard materials such as brick, tile, concrete, etc. We recommend that you select drill mode when drilling in soft materials.

Follow these directions to adjust the drill mode.


WARNING:


■ For hammer mode: Slide the mode selector to the left.

■ For drill mode: Slide the mode selector to the right.

HANDLE

ASSEMBLY

HANDLE

ADJUST DEPTH

GAUGE ROD

HANDLE

SLIDE RIGHT FOR

DRILLING MODE

SLIDE LEFT FOR

HAMMER MODE

TO

TIGHTEN

TO

LOOSEN

Fig. 4

Fig. 5

Fig. 6

10

OPERATION

ADJUSTING THE SPEED

See Figure 7.

The hammer drill has a two-speed knob that provides a high speed of approximately 3,000 RPM and a low speed of approximately 1,000 RPM (stated speeds are with the trigger switch in the “Full-on” position).

Follow these directions to adjust the speed.


WARNING:


■ For high speed: Rotate the two-speed knob clockwise, aligning the indicator mark with the “2.”

■ For low speed: Rotate the two-speed knob counterclockwise, aligning the indicator mark with the “1.”

If you have difficulty changing from one gear range to the other, turn the chuck by hand until the gears engage.

CAUTION:

Never change gears while the tool is running. Failure to obey this caution could result in serious damage to the drill.

1

CLOCKWISE TO

HIGH SPEED

COUNTERCLOCKWISE

TO LOW SPEED

2

FORWARD

ROTATION

Fig. 7

CHANGING THE ROTATION

See Figure 8.

The direction of the chuck is controlled by the lever located above the switch trigger.

Follow these directions to change the rotation.


WARNING:


■ For forward rotation: Move the lever to the left.

■ For reverse rotation: Move the lever to the right.

NOTE: The hammer drill will not run unless the lever is pushed fully to the left or right.

CAUTION:

The hammer drill is not designed for reverse hammering. Failure to obey this caution may result in property damage.

REVERSE

ROTATION

Fig. 8

DEPRESS SWITCH TRIGGER TO

TURN HAMMER DRILL ON

Fig. 9

11

OPERATION

TURNING THE HAMMER DRILL ON/OFF

See Figure 9.

Follow these directions to turn the hammer drill on and off.

■ To turn the drill on: Depress the switch trigger.

■ To turn the drill off: Release the switch trigger.

LOCKING ON

See Figure 10.

The lock-on feature allows you to lock the drill on when you operate it continuously for extended periods of time.

If you have the “lock-on” feature engaged during use and the drill is disconnected from the power supply, disengage the “lock-on” feature immediately. Also, do not lock the trigger switch if you might need to suddenly stop the drill.

WARNING:

Before connecting the hammer drill to a power supply, make sure it is not in the “locked-on” position.

Failure to do so could result in accidental starting of the drill resulting in possible serious injury.

Follow these directions to lock on.

■ Depress the switch trigger.

■ Push in the lock-on button.

■ Release the switch trigger.

■ Release the lock-on button.

NOTE: To release the lock, depress the switch trigger.

DRILLING

See Figure 11.

Follow these directions to drill.

■ Depress and release the switch trigger to make sure the drill is in the OFF position before connecting it to a power supply.

■ Check the rotation lever for the correct setting. Refer to “CHANGING THE ROTATION” earlier in this manual.

■ Secure the material to be drilled in a vise or with clamps to keep it from turning as the drill bit rotates.

■ Plug the hammer drill into a power supply.

■ Hold the drill firmly and place the bit at the point to be drilled.

■ Depress the switch trigger to start the drill.

■ Move the drill bit into the workpiece applying only enough pressure to keep the bit cutting.

NOTE: Do not force the drill or apply side pressure to elongate a hole. Let your drill and bit do the work.

SWITCH

TRIGGER

LOCK-ON

BUTTON

Fig. 10

Fig. 11

WARNING:

Be prepared for binding or breakthrough. When these situations occur, the drill has a tendency to grab and kick in the opposite direction and could cause loss of control when breaking through material. If you are not prepared, this loss of control could result in possible serious injury.

12

OPERATION

HELPFUL TIPS

■ When drilling hard, smooth surfaces, use a center punch to mark the desired hole location. This measure will prevent the drill bit from slipping off center as you start the hole. However, the variable speed feature allows you to start holes without center punching. To accomplish this, operate the drill at a low speed until you start the hole.

■ When drilling metals, use a light oil on the drill to keep it from overheating. The oil will prolong the life of the bit and increase the drilling action.

■ If the bit jams in the workpiece or if the drill stalls, stop the tool immediately. Remove the bit from the workpiece and determine the reason for jamming.

MAINTENANCE

WARNING:

When servicing use only identical Ryobi replacement parts. Use of any other parts may create a hazard or cause product damage.

GENERAL

Avoid using solvents when cleaning plastic parts. Most plastics are susceptible to damage from various types of commercial solvents and may be damaged by their use.

Use clean cloths to remove dirt, carbon dust, etc.

WARNING:

Do not at any time let brake fluids, gasoline, petroleum-based products, penetrating oils, etc. come in contact with plastic parts. They contain chemicals that can damage, weaken, or destroy plastic.

When electric tools are used on fiberglass boats, sports cars, wallboard, spackling compounds, or plaster, it has been found that they are subject to accelerated wear and possible premature failure, as the fiberglass chips and grindings are highly abrasive to bearings, brushes, commutators, etc. Consequently, we do not recommended that this tool be used for extended work on any fiberglass material, wallboard, spackling compounds, or plaster. If, however, you do work with any of these materials, it is extremely important that the tool is cleaned frequently by blowing with an air jet.

WARNING:

Always wear safety goggles or safety glasses with side shields during power tool operation or when blowing dust. If operation is dusty, also wear a dust mask.

LUBRICATION

All the bearings in this tool are lubricated with a sufficient amount of high grade lubricant for the life of the unit under normal operating conditions. Therefore, no further lubrication is required.

13

MAINTENANCE

REMOVING THE CHUCK

See Figures 12, 13, and 14.

Follow these directions to remove the chuck.


WARNING:


■ Open the chuck jaws by turning the chuck collar counterclockwise.

■ Insert a 5/16 in. (7.9 mm) or larger hex key into the chuck.

■ Tighten the chuck jaws using the chuck key provided.

■ Loosen the chuck screw by tapping the hex key sharply with a mallet in a clockwise direction.

■ Open the chuck jaws and remove the hex key.

■ Remove the chuck screw by turning it in a clockwise direction with a screwdriver.

NOTE: The screw has left hand threads.

■ Reinsert the hex key into the chuck.

■ Tighten the chuck jaws securely using the chuck key provided.

■ Loosen the chuck by tapping the hex key sharply with a mallet in a counterclockwise direction.

■ Unscrew the chuck by hand.

TIGHTENING THE CHUCK

See Figures 12 and 13.

The chuck may become loose on the spindle and begin to shake when using the drill. Also, the chuck screw may become loose causing the chuck jaws to bind and prevent them from closing.

Follow these directions to tighten the chuck.


WARNING:


■ Open the chuck jaws by turning the chuck collar counterclockwise.

■ Insert a 5/16 in. (7.9 mm) or larger hex key into the chuck.

■ Tighten the chuck jaws using the chuck key provided.

■ Tap the hex key sharply with a mallet in a clockwise direction to tighten the chuck on the spindle.

CHUCK

JAWS

HEX KEY

SCREWDRIVER

HEX KEY

CHUCK JAWS

MALLET

CHUCK

MALLET

CHUCK

Fig. 12

Fig. 13

Fig. 14

■ Open the chuck jaws and remove the hex key.

■ Tighten the chuck screw by turning it in a counterclockwise direction with a screwdriver.

NOTE: The screw has left hand threads.

14

NOTES

15

OPERATOR'S MANUAL

HAMMER DRILL - 1/2 in. (13 mm)

D550H

VARIABLE SPEED – DOUBLE INSULATED

EXTENSION CORD CAUTION

When using a power tool at a considerable distance from a power source, be sure to use an extension cord that has the capacity to handle the current the tool will draw. An undersized cord will cause a drop in line voltage, resulting in overheating and loss of power. Use the chart to determine the minimum wire size required in an extension cord. Only round jacketed cords should be used.

When working with a tool outdoors, use an extension cord that is designed for outside use. This is indicated by the letters

"WA" on the cord's jacket.

Before using any extension cord, inspect it for loose or exposed wires and cut or worn insulation.

**Ampere rating

(on tool faceplate)

Cord Length

25'

50'

100'

0-2.0

2.1-3.4

3.5-5.0

5.1-7.0

7.1-12.0 12.1-16.0

Wire Size (A.W.G.)

16 16 16 16 14 14

16 16 16 14 14 12

16 16 14 12 10 —

CAUTION: Keep the extension cord clear of the working area. Position the cord so that it will not get caught on lumber, tools or other obstructions while you are working with a power tool.

**Used on 12 gauge - 20 amp circuit.

• SERVICE

Now that you have purchased your tool, should a need ever exist for repair parts or service, simply contact your nearest Ryobi Authorized Service Center. Tool service must be performed only by qualified repair personnel. Be sure to provide all pertinent facts when you call or visit. Please call 1-800-525-2579 for your nearest Ryobi

Authorized Service Center. You can also check our Web site at www.ryobitools.com

for a complete list of Authorized Service Centers.

• MODEL NO. AND SERIAL NO.

The model number of this tool will be found on a plate attached to the motor housing.

Please record the model number and serial number in the space provided below.

• HOW TO ORDER REPAIR PARTS

WHEN ORDERING REPAIR PARTS,

ALWAYS GIVE THE FOLLOWING INFORMATION:

D550H

• MODEL NUMBER

• SERIAL NUMBER

RYOBI TECHNOLOGIES INC.

1428 Pearman Dairy Road Anderson, SC 29625

Post Office Box 1207 Anderson, SC 29622 www.ryobitools.com

Phone 1-800-525-2579

983000-129

9-02

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