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8
INSTALLING AND REMOVING DRILL AND SCREWDRIVER BITS
Always set the reversing button to the center (locked "OFF")
position when installing and removing bits.
1. The three-jaw chuck is designed
for self-centering of the bit. Open
jaws large enough by turning the
sleeve (A) Fig. 2 counterclockwise,
when viewing the chuck from the bit
end, so that the bit shank can be
inserted easily.
2. Clean and insert the smooth end
of the bit as far as it will go into the
chuck, or up to the flutes for small
bits.
3. While holding the bit with one
hand, turn the sleeve (A) Fig. 2 clockwise until the bit is gripped in the chuck.
4. Tighten the chuck by turning the sleeve (A) clockwise. Tighten securely.
Do not operate the drill motor while installing or removing
bits. This action may cause the bit to be thrown from the
chuck, causing personal injury.
5. To remove the bit, reverse procedure.
ADJUSTING TORQUE COLLAR
The clutch unit provides twenty clutch settings, a “Drill” (solid lock-up) setting
(and a hammer position for the hammer drill). Lowest torque is available at
setting #1, with maximum torque available at the “Drill” setting. The amount of
output torque may be adjusted by rotating the front collar (A) Fig. 3A, so that the
desired torque setting is aligned with the index mark (B) Fig. 3A. In general,
lower torque settings are used for driving small screws and other delicate work,
while higher torque settings are used for driving larger screws.
The “Drill” position is used for drilling
and for driving very large screws.
The Model 977 is equipped with a
hammer setting (A) Fig. 3B. The
hammer position is used when
“impacting” is needed to assist in the
drilling operation (concrete, bricks,
etc.). The hammering function will not
engage unless the torque collar is set
to the hammer position AND the drill
bit is pushed against the work.
TWO-SPEED GEAR SHIFT
The Model 966, 977, and 978 cordless tools all have a two-speed gear shift
which provides spindle speed ranges of approximately 0 to 450 RPM (LOW)
and 0 to 1400 RPM (HIGH) for Models 977and 978, and 0-400 RPM (LOW)
and 0-1300 RPM (HIGH) for Model 966. To change speed ranges, release
trigger switch to stop motor. Slide speed selector (A) Fig. 4 backward for HIGH
speed or forward for LOW speed.
Fig. 2
A
Fig. 3A
A
Fig. 3B
A
B