Operation – Ryobi D551H User Manual

Page 13

OPERATION

TURNING THE HAMMER DRILL ON/OFF

See Figure 8.
To turn the hammer drill on and off.
n

To turn the drill on: depress the switch trigger.

To turn the drill off: release the switch trigger.

CHANGING THE ROTATION

See Figure 9.
The direction of the chuck is controlled by the lever located
above the switch trigger.
NOTE: The design of the switch will not permit changing
the direction of rotation while the drill is running. Release
the switch trigger and allow the drill to stop before chang-
ing its direction.
n

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 hammer-
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 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 result-
ing in possible serious injury.

To lock on:
n

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.

DEPRESS SWITCH TRIGGER TO

TURN HAMMER DRILL ON

REVERSE

ROTATION

FORWARD

ROTATION

SWITCH

TRIGGER

LOCK-ON

BUTTON

Fig. 10

Fig. 8

Fig. 9