Bosch GDS18V-770C Assembly instructions

1-877-BOSCH99 (1-877-267-2499) www.boschtools.com
Operating/Safety Instructions
Consignes d’utilisation/de sécurité
Instrucciones de funcionamiento y seguridad
IMPORTANT
Read Before Using ●IMPORTANT Lire avant usage ●IMPORTANTE Leer antes de usar
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GDS18V-740C
GDS18V-770C

2
1. Work area safety
a. Keep work area clean and well lit. Cluttered or dark
areas invite accidents.
b. 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.
c. Keep children and bystanders away while
operating a power tool. Distractions can cause you
to lose control.
2. Electrical safety
a. Power tool plugs must match the outlet. Never
modify the plug in any way. Do not use any adapter
plugs with earthed (grounded) power tools.
Unmodified plugs and matching outlets will reduce
risk of electric shock.
b. Avoid body contact with earthed or grounded
surfaces, such as pipes, radiators, ranges and
refrigerators. There is an increased risk of electric
shock if your body is earthed or grounded.
c. Do not expose power tools to rain or wet
conditions. Water entering a power tool will increase
the risk of electric shock.
d. Do not abuse the cord. Never use the cord for
carrying, pulling or unplugging the power tool. Keep
cord away from heat, oil, sharp edges or moving
parts. Damagedorentangled cords increase the risk of
electric shock.
e. When operating a power tool outdoors, use an
extension cord suitable for outdoor use. Use of
a cord suitable for outdoor use reduces the risk of
electric shock.
f. If operating a power tool in a damp location
is unavoidable, use a Ground Fault Circuit
Interrupter (GFCI) protected supply. Use of an GFCI
reduces the risk of electric shock.
3. Personal safety
a. Stay alert, watch what you are doing and use
common sense when operating a power tool. Do
not use a power tool while youare tired or underthe
influence of drugs, alcohol or medication. A moment
ofinattentionwhile operating power tools may result in
serious personal injury.
b. Use personal protective equipment. Always wear
eye protection. Protective equipment such as a dust
mask, non-skid safety shoes, hard hat, or hearing
protection used for appropriate conditions will reduce
personal injuries.
Read all safety warnings, instructions, illustrations and specifications provided with this
power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or
serious injury.
SAVE ALL WARNINGS AND INSTRUCTIONS FOR FUTURE REFERENCE
The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cord-
less) power tool.
General Power Tool Safety Warnings
Safety Symbols
The definitions below describe the level of severity for each signal word.
Please read the manual and pay attention to these symbols.
This is the safety alert symbol. It is used to alert you to potential personal injury
hazards. Obey all safety messages that follow this symbol to avoid possible injury or
death.
DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING indicates a hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.

3
General Power Tool Safety Warnings
c. 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 energizing power tools that have the switch
on invites accidents.
d. Remove any adjusting key or wrench before turning
the power tool on. A wrench or a key left attached to
a rotating part of the power tool may result in personal
injury.
e. Do not overreach. Keep proper footing and
balance at all times. This enables better control of
the power tool in unexpected situations.
f. Dress properly. Do not wear loose clothing or
jewelry. Keep your hair and clothing away from
moving parts. Loose clothes, jewelry or long hair can
be caught in moving parts.
g. If devices are provided for the connection of dust
extraction and collection facilities, ensure these
are connected and properly used. Use of dust
collection can reduce dust-related hazards.
h. Do not let familiarity gained from frequent use of
tools allow you to become complacent and ignore
tool safety principles. A careless action can cause
severe injury within a fraction of a second.
4. Power tool use and care
a. Do not force the power tool. Use the correct power
tool for your application. The correct power tool will
do the job better and safer at the rate for which it was
designed.
b. Do not use the power tool if the switch does not
turn it on and off. Any power tool that cannot be
controlled with the switch is dangerous and must be
repaired.
c. Disconnect the plug from the power source and/
or remove the battery pack, if detachable, from
the power tool before making any adjustments,
changing accessories, or storing power tools. Such
preventive safety measures reduce the risk of starting
the power tool accidentally.
d. Store idle power tools out of the reach of children
and do not allow persons unfamiliar with the power
tool or these instructions to operate the power
tool. Power tools are dangerous in the hands of
untrained users.
e. Maintain power tools and accessories. Check for
misalignment or binding of moving parts, breakage
of parts and any other condition that may affect the
power tool’s operation. If damaged, have the power
tool repaired before use. Many accidents are caused
by poorly maintained power tools.
f. Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges are
less likely to bind and are easier to control.
g. Use the power tool, accessories and tool bits etc.
in accordance with these instructions, taking into
account the working conditions and the work to
be performed. Use of the power tool for operations
different from those intended could result in a
hazardous situation.
h. Keep handles and grasping surfaces dry, clean
and free from oil and grease. Slippery handles and
grasping surfaces do not allow for safe handling and
control of the tool in unexpected situations.
5. Battery tool use and care
a. Recharge only with the charger specified by the
manufacturer. A charger that is suitable for one
type of battery pack may create a risk of fire when
used with another battery pack.
b. Use power tools only with specifically designated
battery packs. Use of any other battery packs may
create a risk of injury and fire.
c. When battery pack is not in use, keep it away
from other metal objects like paper clips, coins,
keys, nails, screws, or other small metal objects
that can make a connection from one terminal
to another. Shorting the battery terminals together
may cause burns or a fire.
d. Under abusive conditions, liquid may be ejected
from the battery, avoid contact. If contact
accidentally occurs, flush with water. If liquid
contacts eyes, additionally seek medical help.
Liquid ejected from the battery may cause irritation
or burns.
e. Do not use a battery pack or tool that is damaged or
modified. Damaged or modified batteries may exhibit
unpredictable behavior resulting in fire, explosion or
risk of injury.

4
a. Hold the power tool by insulated gripping surfaces,
when performing an operation where the fastener
may contact hidden wiring. Fasteners contacting a
“live” wire may make exposed metal parts of the power
tool “live” and could give the operator an electric
shock.
b. Use clamps or another practical way to secure
and support the workpiece to a stable platform.
Holding the work by hand or against your body leaves it
unstable and may lead to loss of control.
c. Do not drive fasteners 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.
d. Use only sockets designed for power impact
wrenches. Sockets designed for hand use may break
under the load this tool generates.
e. Be certain to seat the socket completely and securely
on the output drive.
f. Do not use worn or damaged sockets.
g. Select the correct size sockets and keep the inside of
the socket clean.
h. Do not allow a loose fastener to spin freely within the
socket. The fastener may be thrown out of the socket.
i. Use thick cushioned gloves and limit the exposure
time by taking frequent rest periods. Vibration caused
by impact driver action may be harmful to your hands and
arms.
j. Remove battery pack before changing
accessories. Accidental starting may occur because
battery appliances with a battery inserted are in the
operative condition.
k. Be prepared for a reaction torque when “seating”
or removing a fastener. The tool housing may
tend to twist in the opposite direction of accessory
rotation when “seating” or removing a fastener
depending on the torque setting of the tool.
l. Do not run the tool while carrying it at your side.
The rotating drive could become entangled with
clothing and injury may result.
m. Place the tool onto the fastener only when the
tool is switched off. Rotating driver tools can slide
off the fastener.
Safety Rules for Cordless Impact Wrenches
f. Do not expose a battery pack or tool to fire or
excessive temperature. Exposure to fire or
temperature above 265 °F may cause explosion.
g. Follow all charging instructions and do not charge
the battery pack or tool outside the temperature
range specified in the instructions. Charging
improperly or at temperatures outside the specified
range may damage the battery and increase the risk
of fire.
6. Service
a. Have your power tool serviced by a qualified repair
person using only identical replacement parts.
This will ensure that the safety of the power tool is
maintained.
b. Never service damaged battery packs. Service
of battery packs should only be performed by the
manufacturer or authorized service providers.
General Power Tool Safety Warnings

5
Additional Safety Warnings
a. GFCI and personal protection devices like electrician’s
rubber gloves and footwear will further enhance your
personal safety.
b. Develop a periodic maintenance schedule for
your tool. When cleaning a tool be careful not to
disassemble any portion of the tool since internal
wires may be misplaced or pinched or safety guard
return springs may be improperly mounted. Certain
cleaning agents such as gasoline, carbon tetrachloride,
ammonia, etc. may damage plastic parts.
c. Ensure the switch is in the off position before
inserting battery pack. Inserting the battery pack
into power tools that have the switch on invites
accidents.
Some dust created by power
sanding, sawing, grinding, drilling,
and other construction activities contains chemicals
known to causecancer, 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.

6
Symbols
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 Designation / Explanation
V Volts (voltage)
Ah Amp hour (measurement of battery capacity)
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.)
n0No load speed (rotational speed at no load)
n Rated speed (maximum attainable speed)
.../min Revolutions or reciprocation per minute (revolutions, strokes, surface speed, orbits etc. per minute)
0 Off position (zero speed, zero torque...)
1, 2, 3, ...
I, II, III, Selector settings (speed, torque or position settings. 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)
A
0
A
0
A
0
A
0
A
0
A
0
A
0

7
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.
Symbols
Symbol Designation / Explanation
Alerts user to read manual.
Alerts user to wear eye protection.
Alerts user to wear respiratory protection.
Alerts user to wear hearing protection.
Alerts user to wear eye, respiratory, and hearing protection.
This symbol designates that this tool is listed by Underwriters Laboratories, to United States and
Canadian Standards.
This symbol designates that this tool is listed by the Canadian Standards Association.
This symbol designates that this tool is listed by the Canadian Standards Association, to United
States and Canadian Standards.
This symbol designates that this tool is listed by the Intertek Testing Services, to United States
and Canadian Standards.
Designates Li-ion battery recycling program.

8
(10) (3)
(6)
(8)
(5)
(4)
(9)
(7)
(11)
(1)
Functional Description and Specifications
Disconnect battery pack from tool before making any assembly, adjustments or changing
accessories. Such preventive safety measures reduce the risk of starting the tool accidentally.
Cordless Impact Wrench GDS18V-740C
Fig. 1
(13)
(16)
(17)(12)
(15)
(14)
User Interface
(1) Output drive
(3) Rotational direction switch
(4) Joist hanger
(5) Battery*
(6) Battery release button*
(7) User Interface
(8) Variable speed trigger switch
(9) Handle (insulated gripping surface)
(10) Socket*
(11) Connectivity module compartment
User Interface
(12) Status indicator LED
(13) Worklight
(14) Speed preselection button
(15) Speed preselection level indicator
(16) Mode button
(17) Mode selection indicator
*Accessories shown or described are not included with the
product as standard. You can find the complete selection of
accessories in our accessories range.

9
(10)
(1)
(3)
(6)
(8)
(5)
(4)
(9)
(7)
(11)
(2)
Functional Description and Specifications
Disconnect battery pack from tool before making any assembly, adjustments or changing accesso-
ries. Such preventive safety measures reduce the risk of starting the tool accidentally.
Cordless Impact Wrench GDS18V-770C
Fig. 2
(1) Output drive
(2) Through hole (GDS18V-770C)
(3) Rotational direction switch
(4) Joist hanger
(5) Battery*
(6) Battery release button*
(7) User Interface
(8) Variable speed trigger switch
(9) Handle (insulated gripping surface)
(10) Socket*
(11) Connectivity module compartment
User Interface
(12) Status indicator LED
(13) Worklight
(14) Speed preselection button
(15) Speed preselection level indicator
(16) Mode button
(17) Mode selection indicator
*Accessories shown or described are not included with the
product as standard. You can find the complete selection of
accessories in our accessories range.
(13)
(16)
(17)(12)
(15)
(14)
User Interface

10
Impact Wrench GDS18V-740C GDS18V-770C
Rated voltage 18V 18V
No-load speed
– Setting 1 0–800 RPM 0–800 RPM
– Setting 2 0–1300 RPM 0–1300 RPM
– Setting 3 0–1750 RPM 0–1750 RPM
Impact rate
– Setting 1 0–1600 IPM 0–1600 IPM
– Setting 2 0–2300 IPM 0–2300 IPM
– Setting 3 0–2600 IPM 0–2600 IPM
Maximum torque
– Setting 1 260 Ft-lbs 260 Ft-lbs
– Setting 2 480 Ft-lbs 480 Ft-lbs
– Setting 3 740 Ft-lbs 770 Ft-lbs
Breakaway torque 1180 Ft-lbs 1250 Ft-lbs
Output drive 1/2” Square drive with
Friction Ring
3/4” Square drive with Friction Ring
and Through Hole
Weight tool only 6.4 lbs 6.4 lbs
Permitted battery temperature
during charging +32…+113°F (0…+45C) +32…+113°F (0…+45C)
Permitted ambient temperature
during operation and storage -4…+122°F (-20…+50C) -4…+122°F (-20…+50C)
Recommended ambient
temperature during charging +32…+95°F (0...+35°C) +32…+95°F (0...+35°C)
Data Transmission (GCY42 installed)
Bluetooth® Bluetooth® 4.1 (Low Energy)ABluetooth® 4.1 (Low Energy)A
Signal interval, approx. 8s 8s
Signal range maximum 98ftBmaximum 98ftB
Functional Description and Specifications
Optimized for AMPShare with Max performance from ≥ 8Ah
AThe mobile terminal devices must be compatible wi th Bluetooth® Low Energy devices (version 4.1) and support the
Generic Access Profile (GAP).
BThe signal range may vary greatly depending on external conditions. The Bluetooth® range may be significantly weaker
inside closed rooms and through metallic barriers (e.g. walls, shelving units, cases, etc.).
Battery Packs / Chargers:
Please refer to the battery/charger list, included with your tool.
NOTE: For tool specifications refer to the nameplate on your tool.

11
Inserting and Releasing
Battery Pack
Set Forward/Reversing lever (3) to the center (locked
position). Slide charged battery pack (5) into the
housing until the battery pack locks into position (Fig.
3).
Your tool is equipped with a secondary locking latch to
prevent the battery pack from completely falling out of
the handle, should it become loose due to vibration.
To remove the battery pack, press the battery pack
release button (6) and slide the battery pack (5)
completely out of tool housing (Fig. 4).
Inserting and Removing Accessories
Attach only high quality impact ready accessories with
the proper size square drive designed for use with
impact wrenches. To install a socket (10), simply push
completely onto output drive (1) (Fig. 5, 6).
Through hole (2) allows for more secure socket
retention via compatible socket and use of accessory
pin and ring or one-piece retainer. Follow accessory
retention device manufacturer's recommendations for
use of through hole.
Assembly
6
5
5
Fig. 3 Fig. 4
(10)
(10)
(1)
(1)
(2)
Fig. 6
(10) (10)
(1) (1)
(2)
Fig. 5
Disconnect battery pack from tool before making any assembly, adjustments or changing accesso-
ries. Such preventive safety measures reduce the risk of starting the tool accidentally.
GDS18V-740 C
GDS18V-770C

12
Assembly
GCY42 Connectivity Module
installation
To reduce the risk of injury
read the operating instruc-
tions included with Bosch GCY42 connectivity
module. Operating instructions for GCY42 connectivity
module include important information not covered in
this manual.
Only use Button/coin cell 3V
lithium CR2032 battery. Do
not use any other button/coin cells or other forms of
electrical power supply.
Ensure that battery
replacement is carried out
properly. There is a risk of explosion.
Chemical Burn Hazard. Keep
batteries away from children.
This product contains a lithium button/coin cell battery.
If a new or used lithium button/coin cell battery is
swallowed or enters the body, it can cause severe
internal burns and can lead to death in as little as 2
hours. If you think a battery might have been swallowed
or placed inside any part of the body, seek immediate
medical attention.
Always completely secure the
connectivity module
compartment. If the connectivity module compartment
does not close securely, stop using the product, remove
the battery, and keep it away from children.
When discarding batteries,
insulate the ‘+’ and ‘–’
terminals with insulating tape. When disposed of
improperly, lithium batteries may short, causing them to
become hot, burst or ignite.
Never dispose of the batteries
in a fire or expose to high
heat. The batteries may explode.
If GCY42 connectivity module is not purchased with the
tool, or if the replacement of the module or the battery
becomes necessary, please follow this procedure (See
Fig. 7):
- Using a flat screwdriver or a coin, remove the cover
(A) from the side of the handle, by turning it 1/4 turn
counter-clockwise.
- If the tool is already equipped with the connectivity
module, remove the battery (B), but do not remove
the connectivity module (C).
- If the connectivity module is installed for the first
time, remove the plastic placeholder (D) from the
connectivity module compartment, and place the
connectivity module (C) in the compartment observing
correct orientation. Note: Store the placeholder (D)
in a safe place. Reinsert the placeholder again if the
communications module is removed.
- Next place new battery (B) on the top of the
connectivity module with the “+” polarity facing up.
- Place the cover (A) over the battery and turn it ¼-turn
clockwise to lock using a flat screwdriver or a coin.
D
B
C
A
Fig. 7

13
Connectivity
To reduce the risk of injury read the operating instructions included with Bosch GCY42
connectivity module. Operating instructions for GCY42 connectivity module include important
information not covered in this manual.
Bluetooth®
Do not use the power tool with
Bluetooth® in the vicinity of
gas stations, chemical plants, areas where there is
danger of explosion and areas subject to blasting. Do
not use the power tool with Bluetooth® in airplanes.
Do not use the power tool with Bluetooth® in the
vicinity of medical devices. Avoid operation in the
direct vicinity of the human body over longer
periods of time. When using the power tool with
Bluetooth®, interference with other devices and
systems, airplanes and medical devices (e.g., cardiac
pacemakers, hearing aids) may occur. The Bluetooth®
word mark and logos are registered trademarks owned
by Bluetooth SIG, Inc. and any use of such marks by
Robert Bosch Tool Corporation is under license.
Follow all instructions and
warnings provided by your
Bluetooth® device manufacturer. Failure to follow
recommended procedures could result in personal
injury or property damage.
Exercise extreme caution
when using Bluetooth®
devices to control or change power tool functions.
Operation of the device may be in a different area than
the paired power tool. Paired devices may have
functionality which allows timed event programming,
including automatically powering on (e.g. flood light).
Depending upon the power tool, these unattended
operations or function changes without direct line of
sight to the paired tool could result in personal injury or
property damage. Always check tool settings
before use. Settings may be
different than when the tool was last used. The
connectivity module enables transfer of data and
settings based on Bluetooth® wireless technology. With
module installed, select tool settings may be changed
remotely by a paired Bluetooth® device and user
installed app.
The connectivity module
GCY42 is equipped with a radio
interface. Local operating restrictions, e.g. in military
sites or hospitals, are to be observed. Transmitters have
demonstrated an ability to unintentionally interfere with
other devices.
Think safety
SAFETY IS A COMBINATION OF OPERATOR COMMON
SENSE AND ALERTNESS AT ALL TIMES WHEN THE
TOOL IS BEING USED.
FCC caution
The manufacturer is not responsible for radio
interference caused by unauthorized modifications
to this equipment. Such modifications could void the
user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1) This device may not cause harmful interference,
and
2) This device must accept any interference received,
including interference that may cause undesired
operation.
NOTE! This equipment has been tested and found to
comply with the limits for a Class B digital devices,
pursuant to Part 15 of the FCC rules. These limits are
designed to provide reasonable protection against
harmful interference in a residential installation. This
equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there
is no guarantee that interference will not occur in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment off

14
Connectivity
and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment
and receiver.
• Connect the equipment into an outlet on a
circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV
technician for help.
“Exposure to Radio Frequency (RF) Signals: The
wireless device is a radio transmitter and receiver. It is
designed and manufactured not to exceed the emission
limit for exposure to radio frequency (RF) energy set
by the Ministry of Health (Canada), Safety Code 6.
These limits are part of comprehensive guidelines
and established permitted levels of RF energy for the
general population.
These guidelines are based on the safety standards
previously set by international standard bodies. These
standards include a substantial safety margin designed
to assure the safety of all persons, regardless of age
and health.
This device and its antenna must not be co-located
or operating in conjunction with any other antenna or
transmitter.
Industry Canada
This device complies with Industry Canada licence-
exempt RSS standard(s). Operation is subject to the
following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including
interference that may cause undesired operation of
the device.
Using “Bosch Toolbox” app
After pairing your tool with a mobile device you can
adjust certain functions or check the status of the
power tool using Bosch Toolbox app (Fig. 8 and Fig. 9).
Every time you change any setting, the tool will confirm
the changes by flashing the Status indicator LED (12)
blue.
A. Help button – Tapping this button will bring up
help screen.
B. Tool photo – Tapping the photo will let you
customize the photograph of the tool.
C. Power tool battery charge status – The number
of battery icons in green indicates the estimated
charge level of the battery pack. Note: Number of
battery icons may not be equal to the number of
LEDs on the battery fuel gauge.
D. Power tool nickname – Tapping the “pencil” icon
will let you customize the tool nickname. You can
also do it when changing the tool photo.
E. Connection status bar – The connection (signal)
strength is indicated by vertical bars. You can use
the toggle switch to disconnect the tool from your
mobile device.
F. Assigned modes – Allows you to define two modes
of operation (A and B), specifying options such as
Auto Shut Off, Auto Slow Down, and the direction
of rotation for each mode.
G. RPM Adjustment – Allows you to select the
rotation speed.
H. Soft Start – Allows speed ramp-up of the tool.
I. Work Light – Allows you to set the work light’s
brightness and afterglow.
J. User Interface – Allows you to set the brightness
and afterglow of the user interface.

15
Connectivity
K. Reset to Factory Default – Returns the tool to its
original settings.
L. Tool alerts – Tapping the alerts triangle will display
any alerts received from the tool.
M. Info button – Displays tool information and
specifications.
N. Tool Name – Tapping this displays the tool’s model,
serial number, manufacturing date, and baretool
number.
O. Register Tool – Tapping this registers the tool.
P. Tool Specs – Tapping this displays the tool’s
voltage, maximum torque, no load speed, impact
rate, drive/bit holder type, head length, and weight
(excluding battery).
Q. Tool Usage Info – Tapping this displays the tool’s
run time.
R. Bluetooth Low Energy Module – Tapping this
displays the Bluetooth module’s name, firmware
version, and whether the firmware is up to date.
Note: Refer to the in-app Help screen (A) for more
information on connectivity features, modes, and
settings.
GDS18V-740C
GDS18V-740C
C
B
A
D
E
F
G
H
I
J
K
LM
g. 8
Fig. 8
GDS18V-740C
GDS18V-740C C
B
N
O
P
Q
R
Fig. 9

16
Intended Use
This tool is intended for the
tightening and loosening of
bolts, nuts and various threaded fasteners. This tool
is not intended for use as a drill.
Variable Speed Controlled
Trigger Switch
Your tool is equipped with a variable speed trigger
switch. The tool can be turned "ON" or "OFF" by
squeezing or releasing the trigger. The speed can be
adjusted from the minimum to maximum nameplate
RPM by the pressure you apply to the trigger. Apply more
pressure to increase the speed and release pressure to
decrease speed (Fig. 1).
Brake
When the trigger switch is released it activates the
brake to stop the chuck quickly. This is especially useful
in the repetitive driving and removal of screws.
Forward/Reversing Lever
and Trigger Lock
After tool use, lock trigger in
“OFF” position to help prevent
accidental starts and accidental discharge.
Do not change direction of
rotation until the tool comes
to a complete stop. Shifting during rotation of the
chuck can cause damage to the tool.
Your tool is equipped with a forward/
reversing lever and trigger lock (3) located above the
trigger (Fig. 10). This lever was designed for changing
rotation of the socket, and for locking the trigger in an
“OFF” position.
To lock the trigger, move the lever to the center.
For forward rotation, (with chuck pointed away from
you) move the lever to the far left.
For reverse rotation move the lever to the far right.
To activate trigger lock move lever to the center off
position.
Built-in work light
Your tool is equipped with an LED light (13) for better
visibility when using the tool.
After the trigger (8) is activated, the LED will then stay
on for 10 seconds. The length of time for afterglow
can be changed in ‘Bosch ToolBox’ app setting (if
connected).
Operating tips
You will extend the life of your bits and do neater work
if you always put the bit in contact with the work before
pulling the trigger. During the operation, hold the
tool firmly and exert light, steady pressure. Too much
pressure at low speed will stall the tool. This can be
damaging to both tool and bit.
Driving with variable speed
The technique is to start slowly, increasing the speed as
the screw runs down. Set the screw snugly by slowing to
a stop. Prior to driving screws, pilot and clearance holes
should be drilled.
Always hold the tool straight on the bolt to be tightened.
The best method to determine the right impacting/
tightening duration is by means of a trial. For small
screws, the right impacting/ tightening duration can be
reached in less than 0.5 Sec. Therefore, work with low
RPM and switch the tool off immediately when the screw
is tight and the impacting sound can be heard.
Operating Instructions
(3) (3)
Fig. 10

17
Operating Instructions
For screwing larger, longer wood screws into hard
material, pre-drilling is the best method.
Tightening Torque
The tightening torque depends on the duration of the
impacting/tightening action. The largest tightening
torque is achieved after approx. 6 to 10 Sec. impacting
/ tightening action.
The torque build-up depends on the following factors:
• Hardness of the bolts/nuts.
• Type of washer (disk washer, spring washer, seal).
• Hardness of the material to be joined.
• Lubricating effect at the surfaces of the junction.
This leads to the following application cases:
Hard joining application: The joining of metal to metal
with a disk washer. The maximum torque is reached
after a relative short impacting/tightening action.
Medium joining application: The joining of metal
to metal when using spring ring washer, disk spring
washer, stud bolts or bolts/nuts with conical seats.
Soft joining application: The joining of e.g. metal to
wood or insulation material.
For middle or soft joining cases, the maximum
tightening torque is less than for hard cases. Therefore,
a longer impacting/tightening action is necessary to
arrive at the maximum tightening torque.
Selecting the working mode
The power tool has two preset working modes: A and B
(17). You can also program working modes for different
applications and adjust existing modes via the Bosch
Toolbox under A and B.
To switch between the working modes A and B (17),
press the Mode button (16).
By Default Mode A is designed for Self-Drilling Screws.
Auto Slow Down is activated in both the forward and
reverse directions.
By Default Mode B is designed for Wood Screws. In
the forward direction Auto Shut-off is activated. In the
reverse direction Auto Shut Off functions as Auto-Bolt
Release for the default Mode B.
Note: Only one Setting or Mode can be active on the tool
at a time. 1, 2, 3, A, or B.
Fastening with screws
The procedure shown in (Fig. 11) will help to fasten
materials together with your tool and will reduce the
possibility of stripping, splitting or separating the
material.
First, clamp the pieces together and drill the first hole
2/3 the diameter of the screw. If the material is soft,
drill only 2/3 the proper length. If it is hard, drill the
entire length.
Second, unclamp the pieces and drill the second hole
the same diameter as the screw shank in the first or top
piece of wood.
Third, if flat head screw is used, countersink the hole
to make the screw flush with the surface. Then, simply
apply even pressure when driving the screw. The screw
shank clearance hole in the first piece allows the screw
head to pull the pieces tightly together.
Driving nuts and bolts
Use variable speed control with caution for driving nuts
and bolts with socket attachments. The technique is
to start slowly, increasing speed as the nut or bolt runs
down. The nut or bolt is set when the socked comes to
a stop.
Note: Ensure that no metal particles enter the power
tool. After working at a low speed for an extended
period, you should operate the power tool at the
maximum speed for approximately three minutes
without load to cool it down.
2. Drill same
diameter as
screw shank.
3. Countersink same
diameter as screw
head.
1. Drill 2/3 diameter and 2/3
of screw length for soft
materials, full length for
hard materials.
Screw
Apply a slight
even pressure
when driving
screws.
FASTENING WITH
SCREWS
Fig. 11

18
Cold weather use (32°F)
Due to the lubrication used in the impacting
mechanism, the tool should be run for three minutes
at no load prior to actual usage. This will warm the
lubricant and provide better performance.
User interface
Status indicator LED
The LED bar at the top of the user interface illuminates
in various colors to help the user identify the status of
the tool. When the status indicator LED (12) is green,
the tool and battery pack are operating normally and
temperatures are ok. If the indicator changes to yellow,
it means that the tool or battery temperatures have
risen to a high level, and the use of the tool must stop
to allow the tool to cool off. It is best to back off the load
and give the tool chance to cool down. If the indicator
turns red, the tool will shut off to protect itself and/or
the battery pack from an overheating situation.
The status indicator LED (12) will also blink blue when
the speed (14) or mode (16) buttons are held for 7
seconds. This will reset the tool settings to factory
default.
Joist Hanger
When using the joist hanger
always be aware that the
accessory is exposed. Always hang the tool in an area
where yourself and bystanders cannot accidently make
contact with the accessory.
To reduce the risk of injury, Do
not use the joist hanger if it
appears damaged or deformed. This could result in
unstable hanging and the tool unexpectedly falling.
To reduce the risk of injury, use
care in selecting the location
for hanging the tool.
The optional joist hanger accessory (4) will allow you
to conveniently attach your tool to a joist, or other
convenient support when not in use.
The joist hanger (4) can be attached to either side of
the tool by securing it with a mounting screw. Always
make sure you securely tighten the mounting screw
before use (Fig.1).
• Select a suitably sized and shaped object that will pro-
vide adequate hanging stability. An unstable hanging
surface could result in the tool unexpectedly falling.
• Ensure that the tool is hung out of the way of walkways
and working areas with bystanders. The tool could
be bumped or a bystander could become entangled
causing the tool to unexpectedly fall.
Operating Instructions

19
Accessories
Service
NO USER SERVICEABLE
PARTS INSIDE. 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.
Batteries
Be alert for battery packs that are nearing their
end of life. If you notice decreased tool performance
or significantly shorter running time between charges
then it is time to replace the battery pack. Failure to do
so can cause the tool to operate improperly or damage
the charger.
Tool Lubrication
Your Bosch tool has been properly lubricated and is
ready for use.
Motors
The motor in your tool has been engineered for many
hours of dependable service. To maintain peak
efficiency of the motor, we recommend it be examined
every six months. Only a genuine Bosch replacement
motor specially designed for your tool should be used.
Cleaning
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.
Ventilation openings and switch levers must be kept
clean and free of foreign matter. Do not attempt to clean
by inserting pointed objects through opening.
Maintenance
Included Accessories Available separately
- Joist hanger - Carrying case
- GCY42 Connectivity Module
To avoid accidents, always disconnect the battery pack from tool before servicing or cleaning.
The use of any other attachments or accessories not specified in this manual may create a
hazard.
Store accessories in a dry and temperate environment to avoid corrosion and deterioration.

20
Lisez toutes les consignes de sécurité, instructions, illustrations et spécifications fournies
avec cet outil électrique. Le non-respect de toutes les instructions figurant ci-après pourrait
causer un choc électrique, un incendie et/ou des blessures graves.
CONSERVEZ TOUS LES AVERTISSEMENTS ET TOUTES LES CONSIGNES
DE SÉCURITÉ POUR RÉFÉRENCE FUTURE.
Dans les avertissements, le terme « outil électroportatif » se rapporte à votre outil branché sur le secteur (avec fil) ou à votre
outil alimenté par piles (sans fil).
Avertissements généraux concernant la sécurité des outils électroportatifs
1. Sécurité du lieu de travail
a. Maintenez le lieu de travail propre et bien éclairé.
Les risques d’accident sont plus élevés quand on
travaille dans un endroit encombré ou sombre.
b. N’utilisez pas d’outils électroportatifs dans des
atmosphères explosives, comme par exemple
en présence de gaz, de poussières ou de liquides
inflammables. Les outils électroportatifs produisent
des étincelles qui risquent d’enflammer les poussières
ou les vapeurs.
c. Éloignez les enfants et les visiteurs quand vous vous
servez d’un outil électroportatif. Vous risquez une
perte de contrôle si on vous distrait.
2. Sécurité électrique
a. Les fiches des outils électroportatifs doivent
correspondre à la prise. Il ne faut absolument
jamais modifier la fiche. N’utilisez pas d’adaptateur
de prise avec des outils électroportatifs munis
d’une fiche de terre. Le risque de choc électrique est
moindre si on utilise une fiche non modifiée sur une
prise qui lui correspond.
b. Évitez tout contact du corps avec des surfaces
reliées à la terre tels que tuyaux, radiateurs,
gazinières ou réfrigérateurs. Le risque de choc
électrique augmente si votre corps est relié à la terre.
c. N’exposez pas les outils électroportatifs à la pluie
ou à l’humidité. Si de l’eau pénètre dans un outil
électroportatif, le risque de choc électrique augmente.
d. Ne maltraitez pas le cordon. Ne vous en servez
jamais pour transporter l’outil électroportatif, pour
le tirer ou pour le débrancher. Éloignez le cordon
de la chaleur, des huiles, des arêtes coupantes ou
des pièces mobiles. Les cordons abîmés ou emmêlés
augmentent les risques de choc électrique.
e. Si vous utilisez un outil électroportatif à l’extérieur,
employez une rallonge conçue pour l’extérieur. Ces
rallonges sont faites pour l’extérieur et réduisent le
risque de choc électrique.
f. S'il est absolument nécessaire d'utiliser l'outil
électroportatif dans un endroit humide, utilisez une
alimentation protégée par un disjoncteur de fuite de
terre (GFCI). L'utilisation d'un disjoncteur GFCI réduit
les risques de choc électrique.
Symboles relatifs à la sécurité
Les définitions ci-dessous décrivent le niveau de gravité pour chaque terme signalant un danger.
Veuillez lire le mode d’emploi et lire la signification de ces symboles.
C’est le symbole d’alerte relatif à la sécurité. Il est utilisé pour vous avertir de
l’existence possible d’un danger de lésion corporelle. Obéissez à tous les messages
relatifs à la sécurité qui suivent ce symbole pour éviter tout risque de blessure ou
même de mort.
DANGER indique une situation dangereuse qui, si elle n’est pas évitée, causera la
mort d’une personne ou une blessure grave.
AVERTISSEMENT indique une situation dangereuse qui, si elle n’est pas évitée,
pourrait causer la mort d’une personne ou une blessure grave.
MISE EN GARDE indique une situation dangereuse qui, si elle n'est pas évitée,
causera une blessure légère ou modérée.