Ryobi D552HK Operator's Manual download pdf (Page 10)

VARIABLE SPEED

The variable speed switch delivers higher speed with

increased trigger pressure and lower speed with decreased

trigger pressure.

NOTE: You might hear a whistling or ringing noise from the

switch during use. Do not be concerned; this is a normal

part of the switch function.

DIRECTION OF ROTATION SELECTOR

(FORWARD/REVERSE)

See Figure 3.

The direction of bit rotation is reversible and is controlled

by a selector located above the switch trigger. With the drill

held in normal operating position, the direction of rotation

selector should be positioned to the left of the switch trigger

for forward drilling. The drilling direction is reversed when

the selector is to the right of the switch trigger.

CAUTION:

To prevent gear damage, always allow the chuck to

come to a complete stop before changing the direction

of rotation.

To stop the drill, release the switch trigger and allow the

chuck to come to a complete stop.

NOTE: The drill will not run unless the direction of rotation

selector is pushed fully to the left or right.

Avoid running the drill at low speeds for extended periods

of time. Running at low speeds under constant usage may

cause the drill to become overheated. If this occurs, cool the

drill by running it without a load and at full speed.

TWO-SPEED GEAR TRAIN

See Figure 4.

The drill has a two-speed gear train designed for drilling or

driving at LO (1) or HI (2) speeds. A switch is located on the

side of the drill to select either LO (1) or HI (2) speed. When

using drill in the LO (1) speed range, speed will decrease

and unit will have more power and torque. When using drill in

the HI (2) speed range, speed will increase and unit will have

less power and torque. Use LO (1) speed for high power

and torque applications, usually for drill bits larger than 3/8

in. Use HI (2) speed for fast drilling or driving applications,

usually for drill bits smaller than 3/8 in.

CAUTION:

To prevent gear damage, always allow the chuck to come

to a complete stop before changing gear speed.

OPERATION

Fig. 4

REVERSE

ROTATION

FORWARD

ROTATION

DIRECTION OF

ROTATION SELECTOR

(FORWARD/REVERSE)

Fig. 3

TWO-SPEED

GEAR SHIFT KNOB

LO (1)

HI (2)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Ryobi D552HK Operator's Manual Page 10

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