Ryobi D551H - Manual (Page 12)

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OPERATION
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.
Fig. 5
Fig. 6
Fig. 7
COUNTERCLOCKWISE
TO LOW SPEED
CLOCKWISE TO
HIGH SPEED
ADJUST DEPTH
GAUGE ROD
TO
TIGHTEN
TO
LOOSEN
AUXILIARY
HANDLE
SLIDE RIGHT FOR
DRILLING MODE
SLIDE LEFT FOR
HAMMER MODE
MODE
SELECTOR