BOSCH 11388 User guide

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 10 Ver página 18

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.

11387

11388

BM 1619929485 12/01 12/6/01 1:37 PM Page 1

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

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 adaptor plugs. Check with a
qualified electrician if you are in doubt as
to whether the outlet is properly
grounded. If the tools should electrically

malfunction or break down, grounding
provides a low resistance path to carry
electricity away from the user. Improper
grounding can shock, burn or electrocute.
Grounded tools are equipped with three
conductor cord and three prong type plugs.

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.

!

WARNING

Power Tool Safety Rules

BM 1619929485 12/01 12/6/01 1:37 PM Page 2

-3-

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.

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.

Use a metal detector to determine if there
are gas or water 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. Water entering an electrical device
may cause electrocution.

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 action

may be harmful to your hands and arms.

Do not use dull or damaged bits and
accessories. Dull or damaged bits have a

greater tendency to bind in the workpiece.

Always use both handles for maximum
control over this hammer. Never attempt to
operate this tool with one hand. This tool

BM 1619929485 12/01 12/6/01 1:37 PM Page 3

develops intense percussive forces during
operation and you may lose control if
attempting one hand operation.

Position yourself to avoid being caught
between the tool or side handle and walls
or posts. Should the bit become bound or

jammed in the work, the reaction 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.

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

BM 1619929485 12/01 12/6/01 1:37 PM Page 4

-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.

BM 1619929485 12/01 12/6/01 1:37 PM Page 5

-6-

Model number 11387 11388
Shank style

3/4" Hex x 21/32" Round SDS Max

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

VENTILATION

OPENINGS

DUST

SHIELD

LOCKING

SLEEVE

AUXILIARY

HANDLE

VENTILATION

OPENINGS

HAND GRIP

TRIGGER

"ON-OFF"

SWITCH
WITH "LOCK­ON" BUTTON

"VARIO-LOCK"-

SELECTOR RING

NOTE: For tool specifications refer to the nameplate on your tool.

SPLINE TOOL HOLDER

(Model 11387 only)

FIG. 1

BM 1619929485 12/01 12/6/01 1:37 PM Page 6

INSTALLING ACCESSORIES

Clean the insert shank end of the accessory
to remove any debris, then lightly grease with
a light oil or lubricant.

(Model 11388 only)

Pull and hold locking sleeve backward. Insert
accessory into the tool holder through the
dust shield, while twisting and pushing inward
until it sets into place. Release locking sleeve
to lock bit in place. Pull outward on the
accessory to be certain it is locked into the
tool holder (fig. 2).

(Model 11387 only)

Insert accessory into the tool holder, while
twisting and pushing inward until it locks
automatically into place (Fig. 3).

To install hex round chisels, align flat on chisel
with alignment mark on tool holder, then push
chisel into tool holder until it lock automatically
into place. Pull outward on the accessory to
be certain it is locked into the tool holder
(Fig. 3).

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, pull and hold
locking sleeve backward and pull bit forward.
All accessories should be wiped clean after
removing.

NOTE: The high efficiency available from the
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.

LOCKING SLEEVE

FIG. 2

-7-

Operating Instructions

!

WARNING

TRIGGER "ON-OFF" SWITCH

WITH "LOCK-ON" BUTTON

To turn the tool “ON” squeeze the trigger
switch. To turn the tool “OFF”, release the
trigger switch, which is spring loaded and will
return to the “OFF” position automatically.
Your tool is also equipped with "Lock-ON"
button located just above the trigger that
allows continuous operation without holding
the trigger.

TO LOCK SWITCH ON: Squeeze trigger fully,
depress button and release trigger.

TO UNLOCK THE SWITCH: Squeeze trigger
and release it without depressing the "Lock­ON" button.

If the "Lock-ON" button is
continuously being

depressed, the trigger cannot be released.
To increase switch life, do not turn switch on

and off while tool is under load.

AUXILIARY HANDLE

The tool must be supported with the
auxiliary handle, which can be swiveled 360˚.
To reposition and/or swivel the handle,
loosen the hand grip, move the handle to the
desired position along the barrel and
securely retighten the hand grip.

FIG. 3

LOCKING

SLEEVE

ALIGNMENT

MARK

FLAT

HEX ROUND CHISEL

!

WARNING

BM 1619929485 12/01 12/6/01 1:37 PM Page 7

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
lubricated with Bosch lubricant at every
brush change.

CARBON BRUSHES

The brushes and commutator in your tool
have been engineered for many hours of
dependable service. To maintain peak
efficiency of the motor, we recommend
every two to six months the brushes be
examined. 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.

REPLACEMENT OF CORD AND

CARBON BRUSHES

Your is designed to provide a qualified
service technician optimal access to replace
the carbon brushes and the cord. This
provides the service technician the ability to
replace these components without the need
of disassembling the entire tool housing.

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

"VARIO-LOCK"- SELECTOR RING

The vario-lock selector ring can be set in any
one of twelve (30˚ increments) positions.
Choose a position which is best suited for
your operation. To adjust, pull the selector
ring forward and hold firmly, then turn both
the accessory and the selector ring to the
desired position. Release the selector ring
and turn the accessory slightly until it locks
in place.

"TOOL TIPS"

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.

All 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.

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.

-8-

BM 1619929485 12/01 12/6/01 1:37 PM Page 8

-9-

* Auxiliary Handle
* Carrying case

(*= 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

BM 1619929485 12/01 12/6/01 1:37 PM Page 9