Porter-Cable 987 - Manual (Page 10)

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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 987 is equipped with a ham-
mer setting (A) Fig. 5B. 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
Models 984 and 987 have a two-speed
gear shift which provides spindle speed
ranges of approximately 0 to 450 RPM
(LOW) and 0 to 1450 RPM (HIGH).
To change speed ranges, release
trigger switch to stop motor. Slide
speed selector (A) Fig. 6 toward rear for
HIGH speed or toward front for LOW
speed.
The low speed position is normally in
high torque applications (drilling larger
holes, driving or removing screws, etc.).
The high speed position is normally
used for lower torque applications.
DRIVER BIT STORAGE
Convenient storage areas (B) Fig. 6 with retaining clips for screwdriver bits are
provided on each side of the tool.
Fig. 6
A B
Fig. 7
A B
SIDE HANDLE
Models 984 and 987 are shipped with
a side handle (A) Fig. 7 to provide
additional control and support during
high torque drilling and driving opera-
tions. The side handle can be used on
either side of the drill/driver. To use,
screw the side handle (A) into the
threaded hole (B) on either side of the
tool.
Fig. 5A
A
Fig. 5B
A
B
ADJUSTABLE GRIPS
Three different grip adjustments (small, medium, and large) are provided with
the drill/driver to accommodate various hand sizes, and to provide maximum
user comfort and control. The drill is shipped with a medium grip (A) Fig. 8
installed.
984-987 - manual - 905273- 04-08-03.qxd 4/8/03 9:41 AM Page 10