Ryobi D550H, Operator'S Manual

Page: 7 / 16

7
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 pre-
cautions 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.
FEATURES
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.