6
7
WARNING
Do not use cutting fl uid
in an overhead or any other position that
allows cutting fl uid to enter motor or switch
enclosure.
6. Plug in tool.
7. With the on(I) / off(O) switch in the off(O) posi-
tion, place the rubber tube over the cutting fl uid
fi tting. Inject cutting fl uid into the rubber tube
using the supplied hand pump. Keep hand pump
and tube away from moving parts. Lubricate
well before starting, and throughout the cutting
operation as needed.
Failure to lubricate properly will cause cutter
damage. The use of HAWG WASH® cutting fl uid
is recommended for long life of these cutters.
The operator is responsible for the application
of lubricants other than HAWG WASH® cutting
fl uid.
In overhead or vertical cutting applications, do
not use cutting fl uids. Use only lubricant pastes
or sprays recommended for high speed cutting.
Do not allow lubricant pastes and sprays to enter
tool.
WARNING
To reduce the risk of injury,
do not hold workpiece by hand.
3. Select High Speed
or Low Speed
, depend-
ing on your application.
WARNING
To reduce the
risk of injury, always keep hands,
gloves, rags, clothing, etc. away
from moving parts and chips. Do
not try to remove chips while the cutter is
rotating. Chips are sharp and can pull objects
into moving parts.
8. Start the drill motor by pulling
the on(I) / off(O) switch out, by
both sides, to the on(I) position.
The drill will not operate unless
the magnet is engaged.
NOTE:
If the cutter does not release from the ar-
bor when the collar is turned, use a locking pliers
to grasp the cutter above the cutter fl utes. Hold-
ing the collar securely in one hand, rotate the pli-
ers clockwise to release the cutter from the arbor.
5. Use a safety strap on vertical, overhead, and
pipe applications.
A. Route the safety strap, through the lower
slots, and wrap it tightly around a solid, rigid
structure. Make sure the strap is not twisted.
WARNING
To reduce the risk of in-
jury, always use a safety strap on vertical,
overhead, and pipe applications. Mounting
can release.
B. Snap the safety strap snaphooks together.
Eliminate any slack in the strap.
C. When using on a vertical surface, secure
the safety strap with a c-clamp or similar
device. This will hold the strap in place and
prevent the tool from sliding down the vertical
surface. Do
not
clamp to the strap. This may
damage the strap and cause it to break.
Maintaining Tool
Keep your tool in good repair by adopting a regular
maintenance program. Before use, examine the
general condition of your tool. Inspect guards,
switches, tool cord set and extension cord for dam-
age. Check for loose screws, misalignment, binding
of moving parts, improper mounting, broken parts
and any other condition that may affect its safe oper-
ation. If abnormal noise or vibration occurs, turn the
tool off immediately and have the problem corrected
before further use. Do not use a damaged tool.
Tag damaged tools “DO NOT USE” until repaired
(see “Repairs”).
Under normal conditions, relubrication is not neces-
sary until the motor brushes need to be replaced.
After six months to one year, depending on use,
return your tool to the nearest
MILWAUKEE
service
facility for the following:
• Lubrication
• Brush inspection and replacement
• Mechanical inspection and cleaning (gears,
spindles, bearings, housing, etc.)
• Electrical inspection (switch, cord, armature, etc.)
• Testing to assure proper mechanical and electrical
operation
Cleaning
Clean dust and debris from vents. Keep the tool
handles clean, dry and free of oil or grease. Use
only mild soap and a damp cloth to clean your tool
since certain cleaning agents and solvents are
harmful to plastics and other insulated parts. Some
of these include: gasoline, turpentine, lacquer thin-
ner, paint thinner, chlorinated cleaning solvents,
ammonia and household detergents containing
ammonia. Never use fl ammable or combustible
solvents around tools.
Repairs
If your tool is damaged, return the entire tool to the
nearest service center.
MAINTENANCE
For a complete listing of accessories refer
to your
MILWAUKEE
catalog or go online to
www.milwaukeetool.com. To obtain a catalog, con-
tact your local distributor or service center.
ACCESSORIES
WARNING
Excessive force on the feed
handle will break magnet free.
9. Even large bits only require a small amount of
pressure on the feed handle.
When feeding the cutter into the material, apply
only enough force to produce a curled chip. Ap-
plying too little force will result in small broken
chips and increased cutting time. Applying too
much force will cause overheating of the cutter
resulting in short cutter life. Overheating of the
cutter can be noticed when cutter and chips
turn brown or blue. Excessive force can cause
the cutter to slow down to a point where cutting
time will increase. The use of cutting lubricants
will reduce cutting heat and increase cutter life.
Use less feed pressure when slotting or notch-
ing because there is less support for the cutting
edges in these situations.
10. Keep constant pressure throughout the entire
operation to prevent chips and burrs from falling
under the cutting edges. Cutting debris under
the cutter can make cutting diffi cult or impos-
sible. Continue lubricating as necessary.
11. When the cut is complete, withdraw the cutter
while the spindle is still rotating.
12. Stop the drill motor by pushing in the on(I) / off(O)
switch.
13. When the spindle has stopped rotating, use
a pliers to remove cutting debris and chips
from the cutter and spindle. Use care to avoid
damaging the cutter teeth.
14.
The center pin is spring loaded. Provide protec-
tion from ejected slug for people and property
below cutting area.
15. Firmly grip the tool to disengaging the magnet.
For the 4272-21, push the magnet switch to
disengage. For the 4274-21, rotate the magnet
knob.
16. When drilling on pipe using the 4274-21, use
the accessory pipe adaptor 48-10-0130 and the
safety strap.
4. For the 4272-21, position the tool so the center
pin is directly over the desired cutting location.
Push the magnetic activation switch to engage
the magnet. The drill will not operate unless the
magnet is engaged.
For the 4274-21, position the tool so the center
pin is directly over the desired cutting location.
Rotate the magnet knob to engage the magnet.
The magnet icons will align
. The drill will not
operate unless the magnet is engaged.
WARNING
• Do not use cutting fl uid in an overhead or
any other position that allows cutting fl uid
to enter motor or switch enclosure.
•
Wet connections are shock haz-
ards. Prevent cutting fl uid from
traveling along cord and contact-
ing the outlet, extension cord
connections or tool plug. Each
time tool is plugged in, elevate extension
cord or gang box connections and ar-
range a drip loop. If plug or connections
get wet, turn power off to outlet before
unplugging tool.
WARNING
To reduce the risk of injury,
always unplug your tool before performing
any maintenance. Never disassemble the tool
or try to do any rewiring on the tool’s electrical
system. Contact a MILWAUKEE service facility
for ALL repairs.
WARNING
To reduce the risk of injury,
electric shock and damage to the tool, never
immerse your tool in liquid or allow a liquid
to fl ow inside the tool.
WARNING
To reduce the risk of injury,
always unplug the tool before attaching or
removing accessories. Use only specifi cally
recommended accessories. Others may be
hazardous.
