Bosch 11304 User Manual
Operating/Safety Instructions
Consignes de fonctionnement/sécurité
Instrucciones de funcionamiento
y seguridad
IMPORTANT: IMPORTANT : IMPORTANTE:
Read Before Using Lire avant usage Leer antes de usar
For English Parlez-vous français? ¿Habla español?
See page 2 Voir page 9 Ver página 16
Consumer Information
Renseignement des consommateurs
Información para el consumidor
Toll Free Number: Appel gratuit : Número de teléfono gratuito:
1-877-BOSCH99 (1-877-267-2499) http://www.boschtools.com
11304
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Read and understand all instructions. Failure to follow all instructions
listed below, may result in electric shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
-2-
Work Area
Keep your work area clean and well lit.
Cluttered benches and dark areas invite
accidents.
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.
Keep by-standers, children, and visitors
away while operating a power tool.
Distractions can cause you to lose control.
Electrical Safety
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 the
three wire grounded power cord and
grounded power supply system. Before
plugging in the tool, be certain the outlet
voltage supplied is within the voltage marked
on the nameplate. Do not use “AC only”
rated tools with a DC power supply.
Avoid body contact with grounded surfaces
such as pipes, radiators, ranges and
refrigerators. There is an increased risk of
electric shock if your body is grounded. If
operating the power tool in damp locations is
unavoidable, a Ground Fault Circuit Interrupter
must be used to supply the power to your
tool. Electrician’s rubber gloves and footwear
will further enhance your personal safety.
Don't expose power tools to rain or wet
conditions. Water entering a power tool will
increase the risk of electric shock.
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. Replace damaged
cords immediately. Damaged cords increase
the risk of electric shock.
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. Refer to
“Recommended sizes of Extension Cords” in
the Accessory section of this manual.
Personal Safety
Stay alert, watch what you are doing and
use common sense when operating a
power tool. Do not use tool while tired or
under the influence of drugs, alcohol, or
medication. A moment of inattention while
operating power tools may result in serious
personal injury.
Dress properly. Do not wear loose clothing
or jewelry. Contain long hair. Keep your
hair, clothing, and gloves away from
moving parts. Loose clothes, jewelry, or long
hair can be caught in moving parts. Keep
handles dry, clean and free from oil and
grease.
Avoid accidental starting. Be sure switch is
“OFF” before plugging in. Carrying tools with
your finger on the switch or plugging in tools
that have the switch “ON” invites accidents.
Remove adjusting keys or wrenches before
turning the tool “ON”. A wrench or a key that
is left attached to a rotating part of the tool
may result in personal injury.
Do not overreach. Keep proper footing and
balance at all times. Proper footing and
balance enables better control of the tool in
unexpected situations.
Use safety equipment. Always wear eye
protection. Dust mask, non-skid safety
shoes, hard hat, or hearing protection must be
used for appropriate conditions.
Tool Use and Care
Use clamps or other practical way to
secure and support the workpiece to a
stable platform. Holding the work by hand or
against your body is unstable and may lead to
loss of control.
!
WARNING
Power Tool Safety Rules
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-3-
Do not force tool. Use the correct tool for
your application. The correct tool will do the
job better and safer at the rate for which it is
designed.
Do not use tool if switch does not turn it
“ON” or “OFF”. Any tool that cannot be
controlled with the switch is dangerous and
must be repaired.
Disconnect the plug from the power source
before making any adjustments, changing
accessories, or storing the tool. Such
preventive safety measures reduce the risk of
starting the tool accidentally.
Store idle tools out of reach of children and
other untrained persons. Tools are
dangerous in the hands of untrained users.
Maintain tools with care. Keep cutting tools
sharp and clean. Properly maintained tools,
with sharp cutting edges are less likely to bind
and are easier to control. Any alteration or
modification is a misuse and may result in a
dangerous condition.
Check for misalignment or binding of
moving parts, breakage of parts, and any
other condition that may affect the tools
operation. If damaged, have the tool
serviced before using. Many accidents are
caused by poorly maintained tools. Develop a
periodic maintenance schedule for your tool.
Use only accessories that are recommended by the manufacturer for your
model. Accessories that may be suitable for
one tool, may become hazardous when used
on another tool.
Service
Tool service must be performed only by
qualified repair personnel. Service or
maintenance performed by unqualified
personnel could result in a risk of injury. For
example: internal wires may be misplaced or
pinched, safety guard return springs may be
improperly mounted.
When servicing a tool, use only identical
replacement parts. Follow instructions in
the Maintenance section of this manual.
Use of unauthorized parts or failure to follow
Maintenance Instructions may create a risk of
electric shock or injury. Certain cleaning
agents such as gasoline, carbon tetrachloride,
ammonia, etc. may damage plastic parts.
Demolition Hammer Safety Rules
Hold tools by insulated gripping surfaces
when performing an operation where the
cutting tool may contact hidden wiring or it
own cord. Contact with a "live" wire will make
exposed metal parts of the tool "live" and
shock the operator. Do not drill, fasten or
break into existing walls or other blind areas
where electrical wiring may exist. If this
situation is unavoidable, disconnect all fuses
or circuit breakers feeding this worksite.
Wear ear protectors when using the tool
for extended periods. Prolonged exposure to
high intensity noise can cause hearing loss.
Do not cut or drill into gas lines. Use a
metal detector to determine if there are
metal pipes hidden in the work area or call
the local utility company for assistance
before beginning the operation. Striking or
cutting into a gas line will result in explosion.
Always use the side handle for maximum
control over torque reaction or kick-back.
Never attempt to operate this tool with one
hand. The slip clutch engages if you firmly
control the tool during a torque reaction or
kickback.
Always wear safety goggles or eye
protection when using this tool. Use a dust
mask or respirator for applications which
generate dust. Safety goggles or eye
protection will help deflect fragments of the
material that may be thrown toward your face
and eyes. Dust generated or gases released
from the material you are cutting (i.e. asbestos
insulated pipes, radon) may cause respiratory
difficulties.
Use thick cushioned gloves and limit the
exposure time by taking frequent rest
periods. Vibration caused by hammer-drill
action may be harmful to your hands and
arms.
Position yourself to avoid being caught
between the tool or side handle and walls
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or posts. Should the bit become bound or
jammed in the work, the reaction torque of
the tool could crush your hand or leg.
Do not strike the bit with a handheld
hammer or sledge hammer when
attempting to dislodge a bound or jammed
bit. Fragments of metal from the bit could
dislodge and strike you or bystanders.
Never place the tool down until the motor
has come to a complete stop.
Do not use dull or damaged bits and
accessories. Dull or damaged bits have a
greater tendency to bind in the workpiece.
When removing the bit from the tool avoid
contact with skin and use proper protective
gloves when grasping the bit or accessory.
Accessories may be hot after prolonged use.
Some dust created by
power sanding, sawing,
grinding, drilling, and other construction
activities contains chemicals known to
cause cancer, birth defects or other
reproductive harm. Some examples of
these chemicals are:
• Lead from lead-based paints,
• Crystalline silica from bricks and cement
and other masonry products, and
• Arsenic and chromium from chemically-
treated lumber.
Your risk from these exposures varies,
depending on how often you do this type of
work. To reduce your exposure to these
chemicals: work in a well ventilated area,
and work with approved safety equipment,
such as those dust masks that are specially
designed to filter out microscopic particles.
-4-
!
WARNING
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-5-
IMPORTANT: Some of the following symbols may be used on your tool. Please study them
and learn their meaning. Proper interpretation of these symbols will allow you to operate the
tool better and safer.
Symbol Name Designation/Explanation
V Volts Voltage (potential)
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watt Power
kg Kilograms Weight
min Minutes Time
s Seconds Time
Diameter Size of drill bits, grinding wheels, etc.
n
0
No load speed Rotational speed, at no load
.../min Revolutions or reciprocation per minute Revolutions, strokes, surface speed,
orbits etc. per minute
0 Off position Zero speed, zero torque...
1, 2, 3, ... Selector settings Speed, torque or position settings.
I, II, III, Higher number means greater speed
Infinitely variable selector with off Speed is increasing from 0 setting
Arrow Action in the direction of arrow
Alternating current Type or a characteristic of current
Direct current Type or a characteristic of current
Alternating or direct current Type or a characteristic of current
Class II construction Designates Double Insulated
Construction tools.
Earthing terminal Grounding terminal
Warning symbol Alerts user to warning messages
Ni-Cad RBRC seal Designates Ni-Cad battery recycling
program
Symbols
0
This symbol designates
that this tool is listed by
Underwriters Laboratories.
This symbol designates
that this tool is listed by
the Canadian Standards
Association.
This symbol designates
that this tool is listed to
Canadian Standards by
Underwriters Laboratories.
This symbol
designates
that
this tool
complies
to NOM
Mexican
Standards.
This symbol designates
that this tool is listed by
Underwriters Laboratories,
and listed to Canadian
Standards by Underwriters
Laboratories.
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FIG. 2
-6-
Model number 11304
Voltage rating 120 V 50 - 60Hz
Amperage rating 15.0 A
No load speed n
0
1,340/min
Shank style Standard 1-1/8" hex, air tool steel
or Bosch internal locking steel.
Functional Description and Specifications
Disconnect the plug from the power source before making any
assembly, adjustments or changing accessories. Such preventive safety
measures reduce the risk of starting the tool accidentally.
!
WARNING
Demolition Hammer
PADDLE ON/OFF
SWITCH
BOSCH
INTERNAL
LOCKING
STEEL
AIR VENTS
FIG. 1
FIG. 3
TOOL
RETAINER
LEVER
NOTCH
(Bosch internal
locking steel)
BOSCH
INTERNAL
LOCKING
STEEL
TOOL
RETAINER
LEVER
COLLAR
(Standard
air steel)
STANDARD
AIR STEEL
AIR VENTS
AIR VENTS
TOOL
RETAINER
LEVER
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PADDLE "ON/OFF" SWITCH
The paddle switch enables the operator to
control the switch functions of "ON /OFF".
TO SWITCH THE TOOL "ON": Squeeze
and hold the paddle lever. TO SWITCH THE
TOOL "OFF ": Release pressure on the
paddle lever. The switch is spring loaded
and will return automatically.
INSTALLING ACCESSORIES
Clean the insert shank end of the accessory
to remove any debris, then lightly grease
with a light oil or lubricant. If work is to be
done where the accessories are changed
frequently and laid in dirt, sand or concrete
dust, it is best not to grease the shank after
wiping clean.
To lock standard air steel in place, lower
the tool retainer lever all the way down and
around the bottom and raise lever all the
way up to the opposite side. To lock, insert
air steel up to the striker and lower the
retainer lever around the shank below the
accessory collar as shown in figure 2.
To lock Bosch internal locking steel in
place, lower tool retainer until you can slide
the internal locking steel up to the striker.
NOTE: notch on internal locking steel should
always face toward the retainer lever. To
lock, raise the tool retainer lever all the way
up as shown in figure 3.
NOTE: The high efficiency available from the
rotary hammers can only be obtained if sharp
and undamaged accessories are used. The
"cost" to maintain sharp and undamaged
accessories is more than offset by the "time
saved" in operating the tool with sharp
accessories.
REMOVING ACCESSORIES
Accessories may be hot
after use. Avoid contact
with skin and use proper protective gloves or
cloth to remove.
To remove an accessory, reverse the
previous directions. All accessories should
be wiped clean after removing.
-7-
Operating Instructions
!
WARNING
The tool may be switched on with either
hand. Balance the tool with both hands and
rest the tool on the hip.
For the best penetration rates in concrete,
run the tool with a steady pressure, but do
not use excessive force as this will decrease
the efficiency of the tool. Start chipping with
the tool in a straight in position until the
surface to be broken is chipped. Draw the
hammer back at an angle of 60˚ with the
surface to be broken. Apply only enough
force to keep the tool weight on the
accessory
All grease packed hammers require a short
period of time to warm up. Depending on
the room temperature, this time may vary
from approximately 15 seconds (90˚F) to 2
minutes (32˚F). A new hammer requires a
break-in period before full performance is
realized. This period may require up to 5
hours of operation.
Avoid no load running of the tool. No load or
"empty blows" is the most damaging factor
to any impact hammer.
An electric hammer is likely to be the most
expensive portable tool at the construction
job. The long wear and efficient operation of
the BOSCH hammers will more than justify
the cost for tools of this type. As earlier
pointed out, sharp accessories as well as
clean air vents are necessary for efficient
operation. Establish and follow a set
maintenance program.
"TOOL TIPS"
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-8-
Service
Preventive maintenance
performed by unauthorized
personnel may result in misplacing of
internal wires and components which
could cause serious hazard. We
recommend that all tool service be
performed by a Bosch Factory Service
Center or Authorized Bosch Service Station.
TOOL LUBRICATION
Your Bosch tool has been properly
lubricated and is ready to use. It is
recommended that tools with gears be
regreased with a special gear lubricant at
every brush change.
CARBON BRUSHES
The brushes and commutator in your tool
have been engineered for many hours of
dependable service.
Your tool is equipped with a Pop-out brush
system. The tool will shut off when brush
replacement, lubrication and preventive
maintenance are needed.
Only genuine Bosch replacement brushes
specially designed for your tool should be
used.
BEARINGS
Every second brush change, the bearings
should be replaced at Bosch Factory Service
Center or Authorized Bosch Service Station.
Bearings which become noisy (due to heavy
load or very abrasive material cutting) should
be replaced at once to avoid overheating or
motor failure.
Cleaning
To avoid accidents always
disconnect the tool from
the power supply before cleaning or
performing any maintenance. The tool may
be cleaned most effectively with
compressed dry air. Always wear safety
goggles when cleaning tools with
compressed air.
Ventilation openings and switch levers must
be kept clean and free of foreign matter. Do
not attempt to clean by inserting pointed
objects through openings.
Certain cleaning agents
and solvents damage
plastic parts. Some of these are: gasoline,
carbon tetrachloride, chlorinated cleaning
solvents, ammonia and household
detergents that contain ammonia.
!
WARNING
!
WARNING
Maintenance
!
CAUTION
* Hammer hauler (Model 11304K only)
(*= standard equipment)
(**= optional accessories)
If an extension cord is
necessary, a cord with
adequate size conductors that is capable
of carrying the current necessary for your
tool must be used. This will prevent
excessive voltage drop, loss of power or
overheating. Grounded tools must use 3wire extension cords that have 3-prong
plugs and receptacles.
NOTE: The smaller the gauge number, the
heavier the cord.
RECOMMENDED SIZES OF EXTENSION CORDS
120 VOLT ALTERNATING CURRENT TOOLS
Tool’s
Ampere
Rating
Cord Size in A.W.G.
Wire Sizes in mm
2
3-6
6-8
8-10
10-12
12-16
18 16 16 14 .75 .75 1.5 2.5
18 16 14 12 .75 1.0 2.5 4.0
18 16 14 12 .75 1.0 2.5 4.0
16 16 14 12 1.0 2.5 4.0 —
14 12 — — — — — —
25 50 100 150 15 30 60 120
Cord Length in Feet Cord Length in Meters
!
WARNING
Accessories
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