Power Fist 8416331 User manual
User Manual
8416331V 2.0
1/2 in. Hammer Drill
Please read and understand all instructions before use.
Retain this manual for future reference.
3
For technical questions call: 1-800-665-8685
V 2.0 8416331
1/2 in. Hammer Drill
SPECIFICATIONS
Voltage Rating 120 V, 60 Hz AC
Amperes 6.3 Amp
No Load Speed 2,800 RPM
Chuck 1/2 in. Keyed
Maximum Drilling Capacity in Metal 3/8 in. (10 mm)
Impact rate 0 to 44,800 BPM
SAFETY
IMPORTANT SAFETY PRECAUTIONS
WARNING! The warnings, cautions and instructions discussed in this instruction manual cannot cover all
possible conditions and situations that may occur. It must be understood by the operator that common sense
and caution are factors which cannot be built into this product, but must be supplied by the operator.
WARNING! Read and understand all instructions before using this tool. Keep this manual for the safety warnings
and precautions, operating, inspection and maintenance instructions. When using this tool, basic precautions
should always be followed to reduce the risk of personal injury and/or damage to the equipment. Note that when
this manual refers to a part number, it refers to the parts list included. Before allowing someone else to use this
tool, make sure they are aware of all safety information.
WORK AREA
1. Keep your work area clean and well lit. Cluttered and dark areas invite accidents.
2. Operate in a safe work environment. Do not use machines or tools in damp or wet locations. Do not expose
to rain. Do not use power tools in the presence of flammable gases or liquids.
3. Keep children, bystanders and visitors away from the work area. Do not let them handle tools or extension
cords. No one should be in the work area if they are not wearing suitable protective equipment.
4. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or
dust. Power tools create sparks which may ignite the dust or fumes.
5. Store unused equipment. When not in use, tools must be stored in a dry location to prevent rust. Always
lock up tools and keep them out of reach of children
Safety Icons
Wear suitable
eye protection.
Use of protective gloves is
recommended. Double insulated.
1/2 in. Hammer Drill
4For technical questions call: 1-800-665-8685
8416331V 2.0
PERSONAL SAFETY
1. Dress properly, wear protective equipment. Use breathing, ear, eye, face, foot, hand and head protection.
Always wear ANSI approved impact safety goggles, which must provide both frontal and side protection.
Protect your hands with suitable gloves. Wear a full face shield if your work creates metal filings or wood
chips. Protect your head from falling objects by wearing a hard hat. Wear an ANSI approved dust mask or
respirator when working around metal, wood and chemical dusts and mists. Wear ANSI approved earplugs.
Protective, electrically non-conductive clothes and non-skid footwear are recommended when working. Wear
steel toed boots to prevent injury from falling objects.
2. Do not over reach; keep proper footing and balance at all times. Proper footing and balance enables better
control of the tool in unexpected situations.
3. Keep any articles of clothing, jewelry, hair etc. away from moving parts. These can be caught in moving
parts, resulting in damage to the tool and/or serious injury.
4. Stay alert, watch what you are doing and use your common sense. Do not operate any machine or tool when
you are tired, under the influence of drugs, alcohol or medications.
5. Use clamps or other practical ways to secure and support the work piece to a stable platform. Holding the
work piece by hand or against your body is unstable and may lead to loss of control.
6. Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source
and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or
energising power tools that have the switch on invites accidents.
ELECTRICAL SAFETY
1. Disconnect power supply. Disconnect from power supply when not in use, before cleaning, servicing or
changing any parts or accessories.
2. Protect yourself against electric shocks when working on electrical equipment. Avoid body contact with
grounded surfaces such as pipes, radiators, cooking stoves and refrigerators. There is an increased chance
of electrical shock if your body is grounded.
3. Use caution when performing an operation where the fastener may contact hidden wiring or its own cord.
Fasteners contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the
operator an electrical shock.
4. Double insulated tools are equipped with a polarized plug (one blade is wider than the other). This plug will
fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does
not fit, contact a qualified electrician to install a polarized outlet. Do not change the plug in any way. Double
insulation eliminates the need for a three wire grounded power cord and grounded power supply system.
5. Grounded tools must be plugged into an outlet properly installed and grounded in accordance with all codes
and ordinances. Never remove the grounding prong or modify the plug in any way. Do not use any adapter
plugs. Check with a qualified electrician if you are in doubt as to whether the outlet is properly grounded. If
the tool should electronically malfunction or break down, grounding provides a low resistance path to carry
electricity away from the user.
6. Do not abuse the cord. Never use the cord to carry the tools or pull the plug from an outlet. Keep cord away
from heat, oil, sharp edges or moving parts. Do not operate this tool if the power cord is frayed or damaged.
Replace damaged cords immediately. Damaged cords increase the risk of electric shock. Do not modify the
plug in any way.
7. When operating a power tool outside, use an outdoor extension cord marked “W-A” or “W”. These cords are
rated for outdoor use and reduce the risk of electric shock. Use in conjunction with a Ground Fault Circuit
Interrupter (GFCI). If operating a power tool in a damp location is unavoidable, the use of a GFCI reduces the
risk of electric shock. It is recommended that the GFCI should have a rated residual current of 30 mA or less.
8. Avoid using an unnecessarily long extension cord. Choose a cord that is appropriate for the situation, as a
cord that is too long and running across the floor can be more dangerous than helpful. Using a cord that is
too long or too thin could damage the tool. Unroll the cord completely to prevent it from overheating.
9. Place the electrical cord in a position that prevents it from coming into contact with the tool and from getting
caught by the work piece. The cord should always stay behind the tool.
1/2 in. Hammer Drill
5
For technical questions call: 1-800-665-8685
8416331 V 2.0
EXTENSION CORD PRECAUTIONS
WARNING! Keep the extension cord clear of the working area.
• Position the cord so it will not get caught on the workpiece, tools or any other obstructions while you are
working with the power tool.
• Make sure any extension cord used with this tool is in good condition. When using an extension cord, be
sure to use one of heavy enough gauge to carry the current the tool will draw. An undersized cord will cause
a drop in line voltage resulting in loss of power and overheating.
• The table bellow shows the correct size to use according to cord length and nameplate ampere rating. If in
doubt, use the next heavier gauge. The smaller the gauge number the heavier the cord.
MINIMUM GAUGE (AWG)
EXTENSION CORDS (120 V use only)
Amperage rating Total length
More than Less than 25 ft (7.5 m) 50 ft (15 m) 100 ft (30 m) 150 ft (45 m)
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14 12
12 16 14 12 Not Applicable
• Be sure your extension cord is properly wired and in good condition. Always replace a damaged extension
cord or have it repaired by a qualified electrician before using it. Protect your extension cord from sharp
objects, excessive heat and damp or wet areas.
• Use a separate electrical circuit for your power tools. This circuit must not be less than 14 gauge wire and
should be protected with either a 15 A time delayed fuse or circuit breaker. Before connecting the power
tool to the power source, make sure the switch is in the OFF position and the power source is the same as
indicated on the nameplate. Running at lower voltage will damage the motor.
SPECIFIC SAFETY PRECAUTIONS
WARNING! Know your impact drill. Read the Owner’s Manual carefully. Learn the tool’s applications and
limitations, as well as the specific potential hazards related to this tool. Following this rule will reduce the risk
of electric shock, fire or serious injury.
WARNING! Never use the drill in “impact” mode unless a proper masonry bit is installed and you
are drilling in concrete.
WARNING! Always use a safety shield, hearing protection and a dust mask when operating the drill
in “impact” mode.
• Do not drill material too small to be securely held.
• Always keep hands out of the path of the drill bit. Avoid awkward hand positions where a sudden slip could
cause your hand to move into the path of the drill bit.
• Make sure there are no nails or foreign objects in the part of the workpiece to be drilled.
• Do not install or use any drill bit that exceeds 7 in. (175 mm) in length or extends more than 6 in. (150 mm)
beyond the chuck jaws. They can suddenly bend or break.
• Before starting the operation, jog the drill switch to make sure the drill bit does not wobble or vibrate.
• Do not use fly cutters or multiple-part hole cutters, as they can come apart or become unbalanced in use.
• Make sure the spindle has come to a complete stop before touching the chuck or attempting to change the
drill bit.
• Always make sure the chuck is tight and the drill bit is firmly tightened in the chuck before starting the drill.
1/2 in. Hammer Drill
6For technical questions call: 1-800-665-8685
8416331V 2.0
TOOL USE AND CARE
1. Use the right tool for the job. Do not attempt to force a small tool or attachment to do the work of a larger
industrial tool. The tool will perform better and more safely at the task for which it was intended. Do not
modify this tool or use for a purpose for which it was not designed.
2. Securely hold this tool using both hands. Using tools with only one hand can result in loss of control.
3. Maintain tools with care. Keep tools clean, and in good condition for a better and safer performance. Follow
instructions for lubricating and changing accessories. Inspect tool fittings, alignment periodically and, if
damaged, have them repaired by an authorized technician or replaced. The handles must be kept clean, dry
and free from oil and grease at all times. A properly maintained tool reduces the risk of binding and is easier
to control. Applying excessive force can lead to slips and damage to your work or personal injury.
4. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches are removed from the tool or
machine before connecting it. A wrench or key that is left attached to a rotating part of the tool increases the
risk of personal injury.
5. Avoid unintentional starts. Be sure that the switch is in neutral or OFF position when not in use and before
connecting it to any power source. Do not carry the tool with fingers near or on the switch.
6. Only use the lubricants supplied with the tool or specified by the manufacturer. Other lubricants may not be
suitable and may damage the tool or even make the tool explode.
7. When not in use for an extended period, apply a thin coat of lubricant to the steel parts to avoid rust.
8. Maintain the label and name plate on the tool. These carry important information. If unreadable or missing,
contact Princess Auto for a replacement.
LUBRICATION
All of the bearings in this tool are lubricated with a sufficient amount of high-grade lubricant for the life of the unit
under normal conditions. Therefore, no further lubrication is required.
WARNING! NEVER use WD-40 to clean or lubricate your tool. WD-40 is a solvent that will break down the
internal grease and cause the tool to seize up.
UNPACKING
1. Carefully remove the parts and accessories from the box.
2. Make sure that all items listed in the parts lists are included.
3. Inspect the parts carefully to make sure the tool was not damaged while shipping.
4. Do not discard the packaging material until you have carefully inspected and satisfactorily operated the tool.
WARNING! If any part is missing, do not operate the tool until the missing parts are replaced. Failure to do so
could result in serious personal injury.
1/2 in. Hammer Drill
7
For technical questions call: 1-800-665-8685
8416331 V 2.0
KNOW YOUR IMPACT DRILL
INSPECTION
WARNING! Use only accessories recommended for this drill. Follow instructions that accompany accessories.
Use of improper accessories may cause injury to the operator or damage to the drill.
WARNING! If any part is missing or damaged, do not plug the tool into the power source until the missing or
damaged part is replaced.
PARTS IDENTIFICATION
DRILL COMPONENTS
Key Description Qty
A Drill 1
B Chuck Key 1
C Auxiliary Handle 1
D Auxiliary Handle Collar 1
E Depth Rod 1
1/2 in. Hammer Drill
8For technical questions call: 1-800-665-8685
8416331V 2.0
FORWARD / REVERSE SWITCH
The forward / reverse switch (1) is conveniently mounted above the trigger switch
(See Figure 1). To make the drill rotate clockwise for drilling or driving screws, push the
forward / reverse switch to the left. To make the drill rotate counter clockwise for removing
screws, push the forward / reverse switch to the right.
NOTES:
• Never change position of the forward / reverse switch while the chuck is turning.
• The trigger switch will NOT function with the forward / reverse switch in the middle position.
VARIABLE SPEED TRIGGER SWITCH
This drill is equipped with a variable speed ON / OFF switch.
1. Turning the dial clockwise increases the speed of the hammer drill (2) (See Figure 2).
NOTE: Drill will turn at its slowest speed when the dial switch is turned counter clockwise.
2. To stop the drill, release the trigger switch.
NOTE: Drilling at a slow drilling speed for an extended period of time may cause
the drill motor to overheat. If the drill gets hot, stop drilling and allow it to cool
for at least 15 minutes.
TRIGGER SWITCH LOCK
The trigger switch lock-on feature allows the trigger switch to be locked in the ON position
at full speed when continuous operation for extended periods of time is required (See Figure 3).
To lock the trigger switch in the ON position, pull back on the trigger switch to start the drill
and push the trigger switch lock button (3) into the drill handle. Release the trigger switch
while holding the trigger switch lock button into the drill handle. The drill will continue to run.
To release the trigger switch lock button, pull the trigger switch back and then release the trigger.
DRILL / IMPACT SWITCH
The drill / impact switch (4) changes the drilling mode between conventional
drilling and impact for drilling concrete (See Figure 4). To operate the drill in drill mode,
push the drill / impact switch to the right. To operate the drill in impact mode,
push the drill / impact switch to the left.
WARNING! Always use carbide tipped masonry bits when drilling in masonry.
Any other type of bit could break and possibly cause serious injury.
INSTALLING THE AUXILIARY HANDLE
Install the auxiliary handle for two handed operation of the drill (See Figure 5).
This is particularly important for impact drilling in concrete.
1. Turn the auxiliary handle (1) counter clockwise to open the mounting collar (2).
2. Slide the auxiliary handle collar over the chuck and fully onto the drill housing (3).
3. Rotate the auxiliary handle to a comfortable position.
NOTE: The auxiliary handle must be horizontal when using the depth rod.
4. Turn the auxiliary handle clockwise to tighten the mounting collar onto the drill housing.
NOTE: Do not over tighten the auxiliary handle or you will break the mounting collar.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
1/2 in. Hammer Drill
9
For technical questions call: 1-800-665-8685
8416331 V 2.0
INSTALLING THE DEPTH ROD
The dept rod is used as a gauge to control the depth of the drilled hole.
1. Turn the auxiliary handle (1) counter clockwise to open the mounting collar (2)
(See Figure 6).
2. Insert the hexagonal end of the depth rod (3) into the matching hole in the auxiliary
handle mounting collar (4).
3. Position the depth rod so the tip of the round end (5) will contact the workpiece when
the drill reaches the appropriate depth.
NOTE: Auxiliary handle must be placed in the horizontal position to allow depth rod to
be inserted into the mounting collar. Tighten the auxiliary handle.
INSTALLING BITS
WARNING! Never hold the chuck body with one hand and use the drill power to rotate the
drill body to loosen or tighten bits. You may severely injure your hand.
1. Removed the drill plug from the power source.
2. Rotate the chuck collar (1) to open or close the jaws (2) to a point where the opening
is slightly larger than the bit size you intend to sue (See Figure 7). Raise the front
of your drill slightly to prevent the bit from falling out of the chuck jaws.
3. Insert the drill bit into the chuck the full length of the jaws.
4. Insert the chuck key (3) into one of the three holes in the chuck body. Rotate the chuck
key
clockwise until the drill bit is held firmly in place by the chuck jaws.
NOTE: Do not use a wrench on the chuck key or you may damage the key or chuck.
WARNING! Do not insert the drill bit into the chuck and tighten as shown in Figure 8.
The drill bit MUST be properly inserted with all three chuck jaws holding the bit centered
in the chuck. Failure to properly insert the drill bit could cause the drill bit to be thrown
from the chuck resulting in possible serious injury or damage to the chuck.
REMOVING BITS
1. Remove the drill plug from the power source.
2. Insert the chuck key into one of the three holes in the chuck body. Rotate chuck key
counter clockwise until the chuck jaws release the drill bit.
NOTE: Do not use a wrench on the chuck key or you may damage the key or the chuck.
3. Remove the drill bit.
Figure 6
Figure 7
Figure 8
1/2 in. Hammer Drill
10 For technical questions call: 1-800-665-8685
8416331V 2.0
DRILLING
WARNING! Every time you use the drill you should verify the following:
1. The chuck is tight.
2. The workpiece is properly secured.
3. Safety glasses are being worn.
• Failure to adhere to these safety rules can greatly increase the chances of injury.
• When drilling smooth hard surfaces such as metal, use a centre punch to mark the
desired hole location. This will prevent the drill bit from slipping off centre as
the hole is started.
NOTE: Use slower drilling speeds when drilling larger holes.
NOTE: Use a masonry bit with the drill in impact mode ONLY when drilling in concrete.
• The workpiece to be drilled should be secured in a vise or with clamps to keep it from
turning as the drill bit rotates (See Figure 9).
4. Check the drill bit to make sure it is firmly locked into the drill chuck and the forward / reverse switch is in
the forward position.
5. Hold the drill firmly with both hands whenever possible. Use one hand to grasp the handle and switch and
the other to grasp the body of the drill.
NOTE: Make sure the hand placed on the body of the drill does not cover the air vents. Covering these air
vents will reduce the motor cooling and possibly lead to overheating the motor.
6. While holding the drill firmly, place the point of the drill bit at the point to be drilled. Depress the trigger
switch to start the drill.
7. Move the drill bit into the workpiece applying only enough pressure to keep the bit cutting. Do not force the
drill bit or apply sideways pressure to elongate the hole.
WARNING! Be prepared for binding and bit breakthrough. When these situations occur, the drill bit has the
tendency to grab the workpiece. This action will kick the drill opposite to the direction of the drill bit’s rotation
and could cause a loss of control when breaking through the material as you complete drilling the hole. If you
are not prepared, this loss of control can result in possible serious injury.
When drilling metals, use a light oil on the drill bit to keep it from overheating. The oil will prolong the life of the drill
bit and improve the drill cutting action. If the bit jams in the workpiece or if the drill stalls, release the trigger switch
immediately. Remove the bit from the workpiece and determine the reason for the jam.
DRILLING IN CONCRETE
WARNING! Always use a face shield when drilling in concrete.
Always use the impact mode and slower drill speeds for faster drilling in concrete.
Always use carbide tipped masonry bits.
Figure 9
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