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FEATURES

KNOW YOUR HAMMER DRILL

See Figure 1.

Before attempting to use this product, familiarize yourself 
with all operating features and safety rules.

AUXILIARY HANDLE ASSEMBLY

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

CHUCK KEY

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

DEPTH GAUGE ROD

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

ERGONOMIC DESIGN

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

GRIPZONE

 OVERMOLD TECHNOLOGY

The hammer drill features Gripzone™ overmold technology 
for improved comfort with a positive grip.

LOCK-ON BUTTON

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.

MODE SELECTOR

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

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.

SWITCH TRIGGER

The  hammer  drill  has  a  conveniently  located  switch 
trigger.

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.

Summary of Contents for D551H

Page 1: ...operation and operator safety When 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 ma...

Page 2: ...Assembly 10 n Operation 10 14 n Maintenance 14 15 n Parts Ordering Service 16 TABLE OF CONTENTS INTRODUCTION This tool has many features for making its use more pleasant and enjoyable Safety performan...

Page 3: ...tool n Keep the tool and its handle dry clean and free from oil and grease Always use a clean cloth when clean ing Never use brake fluids gasoline petroleum based products or any strong solvents to cl...

Page 4: ...ed 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 a...

Page 5: ...njury user must read and understand operator s manual before using this product Eye Protection Always wear safety goggles or safety glasses with side shields or a full face shield when operating this...

Page 6: ...ially 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 WARNING To avoid seri...

Page 7: ...ion cords before each use If damaged replace immediately Never use tool with a damaged cord since touching the damaged area could cause electrical shock resulting in serious injury DOUBLE INSULATION D...

Page 8: ...2 in Hammer Speed Low 0 16 000 BPM High 0 48 000 BPM No Load Speed Low 0 1 000 min High 0 3 000 min Input 120 V 60 Hz AC only 5 5 Amps Net Weight 5 75 lbs Blows Per Minute AUXILIARY HANDLE ASSEMBLY D...

Page 9: ...perating in different positions and at different angles GRIPZONE OVERMOLD TECHNOLOGY The hammer drill features Gripzone overmold technology for improved comfort with a positive grip LOCK ON BUTTON The...

Page 10: ...ve care fully inspected and satisfactorily operated the tool n If any parts are damaged or missing please call 1 800 525 2579 for assistance PACKING LIST Hammer Drill Carrying Case Operator s Manual W...

Page 11: ...igure 3 This could cause the drill bit to be thrown from the drill resulting in possible serious injury or damage to the chuck n Insert the drill bit completely into the chuck n Tighten the chuck jaws...

Page 12: ...See Figure 7 CAUTION Never change gears while the tool is running Failure to obey this caution could result in serious damage to the drill The hammer drill has a two speed knob that provides a high s...

Page 13: ...mmer ing Failure to heed this caution may result in damage to the drill LOCKING ON See Figure 10 The lock on feature allows you to lock the drill on when you operate it continuously for extended perio...

Page 14: ...Plug the hammer drill into a power supply n Hold the drill firmly and place the bit at the point to be drilled n Depress the switch trigger to start the drill n Move the drill bit into the workpiece...

Page 15: ...he hex key sharply with a mallet in a clockwise direction n Open the chuck jaws and remove the hex key n Remove the chuck screw by turning it in a clockwise direction with a screwdriver NOTE The screw...

Page 16: ...l 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...

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