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HAMMER DRILL OR DRILL ONLY
Most HD08 operations will be to drill holes in brittle materi-
als such as rock, concrete, or other aggregate. This mode
of operation is selected at the knob below the tool nose by
aiming the picture of the hammer toward the SDS chuck.
For light drilling, the hammering action is turned off by turn-
ing the knob so the picture of a drill bit aims at the chuck. In
both cases the tool must not be operated without the knob
pointing straight front-to-back.
There is no setting for hammering only, how ever, Figure
2 shows a bull-point chisel bit that can be inserted to chip
while the chuck is turning in the hammer drill mode.
IMPORTANT
Do not operate the tool unless the hammer/drill knob
Is set to one of the positions described above.
0PEN-CENTER CLOSED-CENTER OC/CC
The OC/CC selectable model has a knurled knob on the
spool end holding the trigger strut and has two opposing
set screws showing the circuit setting. If the set screws
are horizontal (cross-wise), the setting is for closed-center
circuits. If the set screws are on a vertical line, the setting is
for open-center circuits. The knob can be twisted to change
and should be checked to avoid a wrong setting. A decal
on the trigger strut helps remind you of the knob positions
to select.
Note:
Single circuit type tools now have a knob on the spool
but it cannot be rotated.
DEPTH GAUGE
Drilling depth can be set using the depth gauge shown in
Figure 1. To set the gauge, loosen the side handle, slide
the gauge to the desired position, and tighten the locking
knob. Be sure the side handle is tight before operating the
tool.
The spacing between lines on the gauge is approxi mately
10 mm. The depth gauge can be removed when not in use.
SIDE HANDLE
The side handle assembly, including the depth gauge, fi ts
over the front housing of the hammer drill to assist the op-
erator in maneuvering the tool.
To adjust the side handle to a comfortable position, twist
the handgrip in a counterclockwise direction and reposition
the handle assembly. Once in position, tighten the handle
OPERATION
assembly by twisting the handgrip in a clockwise direction.
Do not clamp the side handle to the black chuck collar.
Clamp the handle only to the housing, against the body
shoulder. The side handle should be securely attached to
the hammer drill during op eration.
Bits with SDS Plus shanks are mounted directly into the
tool holder of the hammer drill. It is a good practice to
slightly grease or oil the bit shanks before inserting them.
To install SDS Plus shanked bits or the bull-point chisel
bit, insert the shank into the tool holder at the nose of the
hammer drill. Then slightly turn the bit until it can be pushed
into the socket. To
sleeve clockwise (while looking from the handle of the
drill to the bit holder) until it stops. Then pull the bit out
of the tool.
11
BIT INSTALLATION
remove the bit, turn the tool holder
Figure 2. Hammer Drill Accessories
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