Adjusting The Speed - Ryobi D551H Operator's Manual

ADJUSTING THE DEPTH GAUGE ROD
See Figure 5.
n Unplug the hammer drill.
n Loosen the handle assembly by turning the handle coun-
terclockwise.
n Adjust the depth gauge rod so that the drill bit extends
beyond the end of the rod to the required drilling depth.
n Tighten handle assembly by turning handle clockwise.
ADJUSTING THE DRILL MODE
See Figure 6.
Use carbide-tipped bits and select hammer mode when
drilling in hard materials such as brick, tile, concrete, etc.
Select drill mode when drilling in soft materials.
n For hammer mode: slide the mode selector to the left.
n For drill mode: slide the mode selector to the right.

ADJUSTING THE SPEED

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
speed of approximately 3,000 RPM and a low speed of ap-
proximately 1,000 RPM (stated speeds are with the trigger
switch in the "Full-on" position).
n For high speed: Rotate the two-speed knob clockwise,
aligning the indicator mark with the "2."
n For low speed: Rotate the two-speed knob counterclock-
wise, aligning the indicator mark with the "1."
If you have difficulty changing from one gear range to the
other, turn the chuck by hand until the gears engage.
OPERATION
12
ADJUST DEPTH
GAUGE ROD
AUXILIARY
HANDLE
SLIDE RIGHT FOR
DRILLING MODE
SLIDE LEFT FOR
HAMMER MODE
COUNTERCLOCKWISE
TO LOW SPEED
CLOCKWISE TO
HIGH SPEED
TO
TIGHTEN
TO
LOOSEN
Fig. 5
MODE
SELECTOR
Fig. 6
Fig. 7