MAC TOOLS MCD791-CA - Maintenance

ENGLISH
10
Accessories

WARNING: Since accessories, other than those
offered by Mac Tools, have not been tested with this
product, use of such accessories with this tool could
be hazardous. To reduce the risk of injury, only Mac
Tools recommended accessories should be used with
thisproduct.
Recommended accessories for use with your tool are
available at extra cost from your local dealer or authorized
service center. If you need assistance in locating any
accessory, please contact Mac Tools, 505 North Cleveland
Ave., Westerville, Ohio 43082, call 1-800-MAC-Tools (1-800-
622-8665) or visit our website www.mactools.com.
Cleaning

WARNING: Blow dirt and dust out of all air vents with
clean, dry air at least once a week. To minimize the risk
of eye injury, always wear ANSI Z87.1 approved eye
protection when performingthisprocedure.

WARNING: Never use solvents or other harsh
chemicals for cleaning the non-metallic parts of
the tool. These chemicals may weaken the plastic
materials used in these parts. Use a cloth dampened
only with water and mild soap. Never let any liquid
get inside the tool; never immerse any part of the tool
into aliquid.
MAINTENANCE

WARNING: To reduce the risk of serious personal
injury, turn unit off and remove the battery pack
before making any adjustments or removing/
installing attachments or accessories. An
accidental start-up can causeinjury.
Low Battery Warning
When in spotlight mode and the battery is nearing
complete discharge, the spotlight will flash twice and then
dim. After two minutes, the battery will be completely
discharged and the drill will immediately shut down. At this
point, replace with a freshbattery.

WARNING: To reduce the risk of injury, always have a
back-up battery or secondary lighting available if the
situation warrantsit.
Performing an Application (Fig. A)

WARNING: To reduce the risk of personal
injury, ALWAYS ensure workpiece is anchored or
clampedfirmly.

WARNING: Always wait until the motor has come to
a complete standstill before changing the direction
ofrotation.
Prior to performing work:
• Set the speed selector
6
. Refer to Speed Selection.
• Install the appropriate bit or accessory into the
chuck. Refer to Installing a Bit or Accessory into a
KeylessChuck.

WARNING:
• Do not use this tool to mix or pump easily
combustible or explosive fluids (benzine,
alcohol,etc.).
• Do not mix or stir flammable liquids
labeledaccordingly.
Screwdriving
Your tool has a clutch with adjustable torque for driving
and removing a wide array of fastener shapes and sizes. The
numbers 1–15 on the mode selection collar
5
are used to
set a torque range for screwdriving. The higher the number
on the collar, the higher the torque and the larger the
fastener which can be driven.
1. Turn the mode selection collar
5
to the
desiredposition. Refer to Mode Selection.
2. Pull the trigger switch applying pressure in a straight
line with the bit until the fastener is seated at the
desired depth in the workpiece.
Recommendations for Screwdriving
• Start with lower torque settings, then advance to higher
torque settings to avoid damage to the workpiece
orfastener.
• Make some practice runs in scrap or on unseen areas of
the workpiece to determine the proper position of the
mode selection collar.
Drilling
IMPORTANT: For MASONRY, such as brick, cement, cinder
block, etc., use carbide-tipped masonry bits.
1. Turn the mode selection collar
5
to the drillsymbol.
Refer to Mode Selection.
2. Place drill bit in contact with the workpiece.
NOTE: Use sharp drill bit only.
3. Pull the trigger switch applying pressure in a straight
line with the bit until it reaches the desired depth.

WARNING: Drill may stall if overloaded causing a
sudden twist. Always expect the stall. Grip the drill
firmly to control the twisting action and avoidinjury.
4. Keep the motor running when pulling the bit back out
of a drilled hole to preventjamming.
Recommendations for Drilling
• When drilling, always apply pressure in a straight line
with the bit, but do not push hard enough to stall the
motor or deflect thebit.
• IF THE DRILL STALLS:
- RELEASE TRIGGER SWITCH IMMEDIATELY,
remove drill bit from work, and determine cause
ofstalling.
- DO NOT DEPRESS TRIGGER SWITCH ON AND
OFF IN AN ATTEMPT TO START A STALLED
DRILL—THIS CAN DAMAGE THEDRILL.
- To minimize stalling or breaking through the
material, reduce pressure on drill and ease the bit
through the last fractional part of thehole.
• Large holes (5/16" to 1/2" [7.9 mm to 12.7 mm]) in steel
can be made easier if a pilot hole (5/32" to 3/16" [4 mm
to 4.8 mm]) is drilledfirst.
• If drilling thin material or material that is prone to
splinter, use a wood “back-up” block to prevent damage
to theworkpiece.