18
19
2. To install/remove cutter:
A. Unplug tool.
B. Raise the drill motor to its highest position on
the slide rail.
C. Twist the quick-change arbor. Insert the cutter
into the arbor and release collar. Tug on cutter
to ensure it is secure. Cutter should be fully
seated into spindle.
D. Reverse procedure to remove cutter.
NOTE:
Do not remove cutter unless slug is
removed. Slug may eject unexpectedly. Avoid
contact with cutter tips. Periodically inspect the
cutter tips for loose or damaged tips.
NOTE:
If the cutter does not release from the arbor
when the collar is turned, use a locking pliers to
grasp the cutter above the cutter fl utes. Holding
the collar securely in one hand, rotate the pliers
clockwise to release the cutter from the arbor.
WARNING
To reduce the risk of injury, do not
hold workpiece by hand.
3. Select High Speed or Low Speed , depending
on your application.
WARNING
Do not use cutting fl uid in an over-
head or any other position that
allows cutting fl uid to enter motor or switch en-
closure.
Wet connections are shock hazards. Prevent
cutting fluid from traveling along cord and
contacting the outlet, extension cord connec-
tions or tool plug. Each time tool is plugged in,
elevate extension cord or gang box connections
and arrange a drip loop. If plug or connec-
tions get wet, turn power off to outlet before
unplugging tool.
4. For the 4272, 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, 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
To reduce the risk of injury, always
use a safety strap on vertical, over-
head, and pipe applications. Mounting can re-
lease.
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.
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.
WARNING
Do not use cutting fl uid in an over-
head or any other position that
allows cutting fl uid to enter motor or switch en-
closure.
6. Plug in tool.
7. With the on(I) / off(O) switch in the off(O) position,
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
i n j u r y, a l w a y s k e e p
hands, gloves, rags, clothing, etc.
away from moving parts and chips. Do
not try to remove chips while the cut-
ter is rotating. Chips are sharp and can pull ob-
jects 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.
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. Apply-
ing 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 notching
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 impossible.
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, push the magnet switch to disen-
gage. For the 4274, rotate the magnet knob.
16. When drilling on pipe using the 4274, use the ac-
cessory pipe adaptor 48-10-0130 and the safety
strap.
MAINTENANCE
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.
Maintaining Tool
Keep your tool in good repair by adopting a regular
maintenance program. Before use, examine the gen-
eral condition of your tool. Inspect guards, switches,
tool cord set and extension cord for damage. Check
for loose screws, misalignment, binding of moving
parts, improper mounting, broken parts and any
other condition that may affect its safe operation.
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, spin-
dles, bearings, housing, etc.)
• Electrical inspection (switch, cord, armature, etc.)
• Testing to assure proper mechanical and electrical
operation
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.
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 thinner, 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.
ACCESSORIES
WARNING
To reduce the risk of injury, always
unplug the tool before attaching or
removing accessories. Use only specifically
recommended accessories. Others may be haz-
ardous.
For a complete listing of accessories refer
to your
MILWAUKEE
catalog or go online to
www.milwaukeetool.com.
