Ryobi HD501 - Manual (Page 9)

Page 9
Fig. 5
OPERATION
VARIABLE SPEED
CONTROL SELECTOR
TO
INCREASE
SPEED
TO
DECREASE
SPEED
VARIABLE SPEED
See Figure 5.
Your hammer drill has a variable speed control selector
designed to allow operator control and adjustment of speed
and torque limits. Speed and torque can be increased or
decreased by rotating the variable speed control selector in
the direction of the arrows shown in figure 5.
NOTE: Hold your hammer drill in normal operating position
and turn the variable speed control selector counterclock-
wise to increase the speed and torque of your hammer drill.
Turn clockwise to decrease the speed and torque of your
hammer drill.
If you desire to lock the switch on at a given speed, depress
the switch trigger, push in and hold the lock-on button, and
release the switch trigger. Next, adjust the variable speed
control selector until the desired speed is reached.
NOTE: If the variable speed control selector is fully turned in
the clockwise direction (zero setting) your drill may not run. If
you desire not to use the variable speed control selector, turn
it in the full counterclockwise direction. This will allow the
speed of your drill to be fully controlled by the amount of
switch trigger depression.
Avoid running your hammer drill at low speeds for extended
periods of time. Running at low speeds under constant usage
may cause your drill to become overheated. If this occurs,
cool your drill by running it without a load and at full speed.
The following guidelines may be used in determining correct
speed for various applications:
LOW speed is ideal when minimum speed and power is
required. For example: starting holes without center punch-
ing, driving screws, mixing paint, and drilling in ceramics.
MEDIUM speed is suitable for drilling hard metals, plastics,
and laminates.
HIGH speed produces best results when maximum power is
required. For example: drilling in wood, soft metals such as
aluminum, brass, and copper, and when using driving acces-
sories.
AUXILIARY HANDLE ASSEMBLY
See Figure 6.
An auxiliary handle assembly has been installed on your
hammer drill. For ease of operation, this auxiliary handle
assembly may be used in either the left-hand or right-hand
position.
■ To adjust, loosen the auxiliary handle assembly by turn-
ing the handle counterclockwise.
■ Rotate auxiliary handle assembly to desired operating
position.
■ Securely tighten by turning the auxiliary handle
clockwise.