AG 125-A22 angle grinder

AG 125-A22 angle grinder
AG 125-A22 angle grinder
It is essential that the operating instructions
are read before the power tool is operated for
the first time.
Always keep these operating instructions together with the power tool.
Ensure that the operating instructions are
with the power tool when it is given to other
1 General information
2 Safety instructions
3 Description
4 Consumables
5 Technical data
6 Before use
7 Operation
8 Care and maintenance
9 Troubleshooting
10 Disposal
11 Manufacturer’s warranty - tools
12 EC declaration of conformity (original)
1 These numbers refer to the illustrations. You can
find the illustrations at the beginning of the operating
In these operating instructions, the designation “power
tool” always refers to the AG 125‑A22 cordless angle
Operating controls and parts 1
@ Guard release button
; Spindle lockbutton
= Ventilation slots
% Release buttons with additional function (charge
status display activation)
& Battery
( Switch-on interlock
) On / off switch
+ Vibration-absorbing side handle
§ Spindle
/ Standard guard
: Clamping flange with O-ring
· Abrasive cutting disc / abrasive grinding disc
$ Clamping nut
£ “Kwik lock” quick-release clamping nut (optional)
| Wrench
1 General information
1.1 Safety notices and their meaning
Draws attention to imminent danger that will lead to
serious bodily injury or fatality.
Draws attention to a potentially dangerous situation that
could lead to serious personal injury or fatality.
Draws attention to a potentially dangerous situation that
could lead to slight personal injury or damage to the
equipment or other property.
Draws attention to an instruction or other useful information.
1.2 Explanation of the pictograms and other
Warning signs
Obligation signs
Wear eye
Read the
before use.
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Rated speed
per minute
per minute
Location of identification data on the power tool
The type designation and serial number can be found
on the type identification plate on the machine or tool.
Make a note of this data in your operating instructions
and always refer to it when making an enquiry to your
Hilti representative or service department.
Generation: 02
Serial no.:
2 Safety instructions
The safety rules in section 2.1 contain all general safety
rules for power tools which, in accordance with the
applicable standards, must be listed in the operating
instructions. Accordingly, some of the rules listed may
not be relevant to this power tool.
2.1 General power tool safety warnings
Read all safety warnings and all instructions. Failure to follow the warnings and instructions 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 batteryoperated (cordless) power tool.
2.1.1 Work area safety
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
2.1.2 Electrical safety
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.
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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. Damaged or entangled 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 residual current device (RCD)
protected supply. Use of an RCD reduces the risk
of electric shock.
2.1.3 Personal safety
Stay alert, watch what you are doing and use
common sense when operating a power tool. Do
not use a power tool while you are tired or under
the influence of drugs, alcohol or medication. A
moment of inattention while operating power tools
may result in serious personal injury.
b) Use personal protective equipment. Always wear
eye protection. Protective equipment such as dust
mask, non-skid safety shoes, hard hat, or hearing
protection used for appropriate conditions will reduce
personal injuries.
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 energising 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
jewellery. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewellery
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.
2.1.4 Power tool use and care
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
c) Disconnect the plug from the power source
and/or the battery pack 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. 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.
2.1.5 Battery tool use and care
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.
2.1.6 Service
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
2.2 Safety warnings common for grinding, sanding,
wire brushing, polishing or abrasive cutting-off
This power tool is intended to function as a grinder
or cut-off tool. 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.
b) Operations such as sanding, wire brushing or
polishing are not recommended to be performed
with this power tool Operations for which the power
tool was not designed may create a hazard and cause
personal injury.
c) Do not use accessories which are not specifically
designed and recommended by the tool manufacturer. Just because the accessory can be attached
to your power tool, it does not assure safe operation.
d) The rated speed of the accessory must be at
least equal to the maximum speed marked on the
power tool. Accessories running faster than their
rated speed can break and fly apart.
e) The outside diameter and the thickness of your
accessory must be within the capacity rating of
your power tool. Incorrectly sized accessories cannot be adequately guarded or controlled.
f) Threaded mounting of accessories must match
the grinder spindle thread. For accessories mounted by flanges, the arbour hole of the accessory
must fit the locating diameter of the flange. Accessories that do not match the mounting hardware
of the power tool will run out of balance, vibrate
excessively and may cause loss of control.
g) Do not use a damaged accessory. Before each
use inspect the accessory such as abrasive
wheels for chips and cracks, backing pad for
cracks, tear or excess wear, wire brush for loose
or cracked wires. If power tool or accessory
is dropped, inspect for damage or install an
undamaged accessory. After inspecting and
installing an accessory, position yourself and
bystanders away from the plane of the rotating
accessory and run the power tool at maximum
no-load speed for one minute. Damaged
accessories will normally break apart during this test
h) Wear personal protective equipment. Depending
on application, use face shield, safety goggles or
safety glasses. As appropriate, wear dust mask,
hearing protectors, gloves and workshop apron
capable of stopping small abrasive or workpiece
fragments. The eye protection must be capable of
stopping flying debris generated by various operations. The dust mask or respirator must be capable of
filtrating particles generated by your operation. Proa)
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longed exposure to high intensity noise may cause
hearing loss.
i) Keep bystanders a safe distance away from
work area. Anyone entering the work area must
wear personal protective equipment. Fragments
of workpiece or of a broken accessory may fly
away and cause injury beyond immediate area of
j) Hold the power tool by insulated gripping surfaces
only, when performing an operation where the
cutting tool may contact hidden wiring. Contact
with a "live" wire will also make exposed metal parts
of the power tool "live" and could give the operator
an electric shock.
k) Position the cord clear of the spinning accessory.
If you lose control, the cord may be cut or snagged
and your hand or arm may be pulled into the spinning
l) Never lay the power tool down until the accessory has come to a complete stop. The spinning
accessory may grab the surface and pull the power
tool out of your control.
m) Do not run the power tool while carrying it at your
side. Accidental contact with the spinning accessory
could snag your clothing, pulling the accessory into
your body.
n) Regularly clean the power tool’s air vents. The
motor’s fan will draw the dust inside the housing
and excessive accumulation of powdered metal may
cause electrical hazards.
o) Do not operate the power tool near flammable
materials. Sparks could ignite these materials.
p) Do not use accessories that require liquid
coolants. Using water or other liquid coolants may
result in electrocution or shock.
2.3 Kickback and related warnings
Kickback is a sudden reaction to a pinched or snagged
rotating wheel, backing pad, brush or any other accessory. Pinching or snagging causes rapid stalling of the
rotating accessory which in turn causes the uncontrolled
power tool to be forced in the direction opposite of the
accessory’s rotation at the point of the binding.
For example, if an abrasive wheel is snagged or pinched
by the workpiece, the edge of the wheel that is entering
into the pinch point can dig into the surface of the material
causing the wheel to climb out or kick out. The wheel may
either jump toward or away from the operator, depending
on direction of the wheel’s movement at the point of
pinching. Abrasive wheels may also break under these
Kickback is the result of power tool misuse and/or incorrect operating procedures or conditions and can be
avoided by taking proper precautions as given below.
Maintain a firm grip on the power tool and position your body and arm to allow you to resist
kickback forces. Always use auxiliary handle, if
provided, for maximum control over kickback or
torque reaction during start-up. The operator can
control torque reactions or kickback forces, if proper
precautions are taken.
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b) Never place your hand near the rotating accessory. Accessory may kickback over your hand.
c) Do not position your body in the area where power
tool will move if kickback occurs. Kickback will
propel the tool in direction opposite to the wheel’s
movement at the point of snagging.
d) Use special care when working corners, sharp
edges etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing have a
tendency to snag the rotating accessory and cause
loss of control or kickback.
e) Do not attach a saw chain woodcarving blade or
toothed saw blade. Such blades create frequent
kickback and loss of control.
2.4 Safety warnings specific for grinding and
abrasive cutting-off operations
Use only wheel types that are recommended for
your power tool and the specific guard designed
for the selected wheel. Wheels for which the power
tool was not designed cannot be adequately guarded
and are unsafe.
b) The grinding surface of centre depressed wheels
must be mounted below the plane of the guard lip.
An improperly mounted wheel that projects through
the plane of the guard lip cannot be adequately
c) The guard must be securely attached to the power
tool and positioned for maximum safety, so the
least amount of wheel is exposed towards the operator. The guard helps to protect operator from
broken wheel fragments, accidental contact with
wheel and sparks that could ignite clothing.
d) Wheels must be used only for recommended applications. For example: do not grind with the side
of cut-off wheel. Abrasive cut-off wheels are intended for peripheral grinding, side forces applied to
these wheels may cause them to shatter.
e) Always use undamaged wheel flanges that are of
correct size and shape for your selected wheel.
Proper wheel flanges support the wheel thus reducing the possibility of wheel breakage. Flanges for
cut-off wheels may be different from grinding wheel
f) Do not use worn down wheels from larger power
tools. Wheel intended for larger power tool is not
suitable for the higher speed of a smaller tool and
may burst.
2.5 Additional safety warnings specific for abrasive
cutting-off operations
Do not "jam" the cut-off wheel or apply excessive
pressure. Do not attempt to make an excessive
depth of cut. Overstressing the wheel increases the
loading and susceptibility to twisting or binding of
the wheel in the cut and the possibility of kickback or
wheel breakage.
b) Do not position your body in line with and behind
the rotating wheel. When the wheel, at the point
of operation, is moving away from your body, the
possible kickback may propel the spinning wheel
and the power tool directly at you.
c) When wheel is binding or when interrupting a cut
for any reason, switch off the power tool and hold
the power tool motionless until the wheel comes
to a complete stop. Never attempt to remove the
cut-off wheel from the cut while the wheel is in
motion otherwise kickback may occur.Investigate
and take corrective action to eliminate the cause of
wheel binding.
d) Do not restart the cutting operation in the workpiece. Let the wheel reach full speed and carefully
re-enter the cut. The wheel may bind, walk up or
kickback if the power tool is restarted in the workpiece.
e) Support panels or any oversized workpiece to
minimize the risk of wheel pinching and kickback.
Large workpieces tend to sag under their own weight.
Supports must be placed under the workpiece near
the line of cut and near the edge of the workpiece on
both sides of the wheel.
f) Use extra caution when making a "pocket cut"
into existing walls or other blind areas. The protruding wheel may cut gas or water pipes, electrical
wiring or objects that can cause kickback.
2.6 Additional safety instructions
2.6.1 Personal safety
Modification of the machine or tampering with its
parts is not permissible.
b) Wear ear protectors. Exposure to noise can cause
hearing loss.
c) Always hold the power tool securely with both
hands on the grips provided. Keep the grips dry,
clean and free from oil and grease.
d) Breathing protection must be worn if the power
tool is used without a dust removal system for
work that creates dust.
e) Improve the blood circulation in your fingers by
relaxing your hands and exercising your fingers
during breaks between working.
f) Avoid touching rotating parts. Switch the power
tool on only after bringing it into position at the
workpiece. Touching rotating parts, especially rotating insert tools, may lead to injury.
g) The appliance is not intended for use by debilitated persons who have received no special training. Keep the appliance out of reach of children.
h) Dust from materials, such as paint containing lead,
some wood species, concrete / masonry / stone containing silica, and minerals as well as metal, may be
harmful. Contact with or inhalation of the dust may
cause allergic reactions and/or respiratory or other
diseases to the operator or bystanders. Certain kinds
of dust are classified as carcinogenic such as oak and
beech dust, especially in conjunction with additives
for wood conditioning (chromate, wood preservative).
Material containing asbestos must only be treated by
specialists. Where the use of a dust-extraction
device is possible it shall be used. To achieve a
high level of dust collection, use a suitable dust
extractor. When indicated wear a respirator appropriate for the type of dust generated. Ensure
that the workplace is well ventilated. Follow national requirements for the materials you want to
work with.
The user and any other persons in the vicinity
must wear suitable eye protection, a hard hat,
ear protection, protective gloves and breathing
protection while the tool is in use.
If the electric tool detects that it is being operated
beyond its limits or if the battery is fully discharged,
it may happen that the disc is no longer braked by
the motor.
2.6.2 Power tool use and care
Grinding discs must be stored and handled carefully in accordance with the manufacturer’s instructions.
b) Never use the power tool without the guard.
c) Secure the workpiece. Use clamps or a vice to
secure the workpiece. The workpiece is thus held
more securely than by hand and both hands remain
free to operate the power tool.
d) Do not use cutting discs for grinding.
e) Tighten the disc and flange securely. If the nut
securing the disc and flange is not tightened firmly,
the disc may work loose from the spindle due to
the braking effect of the power tool’s motor after
switching off.
2.6.3 Electrical safety
Before beginning work, check the working area
(e.g. using a metal detector) to ensure that no
concealed electric cables or gas and water pipes
are present. External metal parts of the power tool
may become live, for example, when an electric cable
is damaged accidentally. This presents a serious risk
of electric shock.
b) Dirty or dusty power tools that have been used frequently for work on conductive materials should
be checked at regular intervals at a Hilti Service
Center. Under unfavorable circumstances, dampness or dust adhering to the surface of the tool,
especially dust from conductive materials, may lead
to damage to the tool.
2.6.4 Careful handling and use of batteries
Observe the special guidelines applicable to the
transport, storage and use of Li-ion batteries.
b) Do not expose batteries to high temperatures and
keep them away from fire. This presents a risk of
c) Do not disassemble, squash or incinerate batteries and do not subject them to temperatures over
80°C. This presents a risk of fire, explosion or injury
through contact with caustic substances.
d) Do not charge or continue to use damaged batteries (e.g. batteries with cracks, broken parts,
bent or pushed-in and/or pulled-out contacts).
e) If the battery is too hot to touch it may be defective.
Place the tool in a location where it can be kept
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under observation, well away from flammable materials, and allow it to cool down. Contact Hilti
Service after the battery has cooled down.
2.6.5 Work area safety
If the work involves breaking right through, take
the appropriate safety measures at the opposite
side. Parts breaking away could fall out and / or fall
down and injure other persons.
b) Slits cut in loadbearing walls of buildings or other
structures may influence the statics of the structure,
especially when steel reinforcing bars or load-bearing
components are cut through. Consult the structural
engineer, architect, or person in charge of the
building project before beginning the work.
3 Description
3.1 Use of the product as directed
The power tool is designed for cutting and grinding metals and mineral materials.
Do not use the battery as a power source for other unspecified appliances.
Working with metals: Only with synthetic resin-bonded, fiber-reinforced grinding or cutting discs.
Working with mineral materials: Cutting and slitting using the corresponding guard (DC-EX 125/5"-C), grinding using
the corresponding guard (DG-EX 125/5").
The power tool may be used only for dry cutting or grinding.
It is recommended that a dust removal system consisting of matched components, i.e. dust removal hood and a
suitable Hilti vacuum cleaner, are used for working on mineral materials such as concrete or stone. These serve to
protect the operator and increase the life of the power tool and disc used.
Working on materials hazardous to the health (e.g. asbestos) is not permissible.
Observe the national health and safety requirements.
To avoid the risk of injury, use only genuine Hilti accessories and insert tools.
The power tool is designed for professional use and may be operated, serviced and maintained only by trained,
authorized personnel. This personnel must be informed of any special hazards that may be encountered. The power
tool and its ancillary equipment may present hazards when used incorrectly by untrained personnel or when used not
as directed.
3.2 Items supplied as standard include:
Power tool
Standard guard
Side handle
Front cover
Clamping flange
Clamping nut
Operating instructions
Approved accessories are available from your Hilti Center or can be ordered online at
3.3 Additional items required for operating the tool
A suitable battery of the specified type (see table in the Technical Data section) and a suitable battery charger from
the C 4⁄36 series.
3.4 Temperature-dependent motor protection
The temperature-dependent motor protection system prevents the power tool overheating by monitoring current input
and motor temperature.
In the event of motor overload due to application of excessive pressure to the disc, performance will drop noticeably
or the power tool may stop running (avoid stalling the power tool in this way).
If the power tool stalls or slows significantly due to overloading, release the pressure applied to the tool and then allow
it to run under no load for approx. 30 seconds.
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3.5 Guard with front cover 2
When grinding with straight grinding discs and cutting with cutting discs in metalworking applications, use the
standard guard with front cover.
3.6 DC‑EX 125/5"‑C compact dust removal hood for cutting (accessory) 3
For cutting mineral materials using diamond discs.
Use of this guard for working on metal is not permissible.
3.7 DG-EX 125/5" dust removal hood for grinding (accessory) 4
The grinding system is suitable only for occasional use with diamond cup wheels for grinding mineral materials.
Use of this guard for working on metal is not permissible.
3.8 Lithium‑ion battery charge status
When the lithium-ion battery is in use, the charge status can be indicated by gently pressing one of the battery release
buttons (press until resistance is felt - do not release the battery). The display on the rear of the battery provides the
following information:
LEDs light constantly
LED 1, 2, 3, 4
LED 1, 2, 3
LEDs blink
Charge status C
C ≧ 75 %
LED 1, 2
50 % ≦ C < 75 %
25 % ≦ C < 50 %
10 % ≦ C < 25 %
C < 10 %
Indication of the charge status is not possible while the power tool is in operation or immediately after operation. If the
battery charge status LEDs flash, please refer to the information given in the Troubleshooting section.
4 Consumables
Discs with a diameter of max. 125 mm, designed for a speed of 11000/min and a peripheral speed of 80 m/sec,
and with a maximum thickness of 6.4 mm (abrasive grinding discs) or 2.5 mm (abrasive cutting discs).
Abrasive cutting disc
Cutting, slitting
Diamond cutting disc
Cutting, slitting
Abrasive grinding disc
Rough grinding
Diamond grinding disc
Rough grinding
Assignment of discs to the equipment used
Front cover (in combination with A)
DG‑EX 125/5" surface
DC‑EX 125/5"-C compact guard (in combination with A)
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Side handle
DC BG 125 hoop grip
(optional for E)
Clamping nut
Clamping flange
Kwick-Lock (optional
for G)
5 Technical data
Right of technical changes reserved.
Power tool
AG 125‑A22
Rated voltage
21.6 V
Rated speed
Max. washer diameter
Ø 125 mm
Weight in accordance with EPTA procedure 01/2003
2.7 kg
B 22/3.3 Li‑Ion (01)
B 22/2.6 Li‑Ion (02)
B 22/5.2 Li‑Ion (01)
Rated voltage
21.6 V
21.6 V
21.6 V
5.2 Ah
3.3 Ah
2.6 Ah
Energy capacity
112.32 Wh
71.28 Wh
56.16 Wh
0.78 kg
0.78 kg
0.48 kg
Information about the power tool and applications
Drive spindle thread (arbor size)
Spindle length
M 14
22 mm
The vibration values given in these instructions have been measured in accordance with a standardized test and may
be used to compare one electric tool with another. They may be used for a preliminary assessment of exposure.
The data given represents the main applications of the electric tool. However, if the electric tool is used for different
applications, with different accessories or is poorly maintained, the data may vary. This may significantly increase
exposure over the total working period. An accurate estimation of exposure should also take into account the times
when the tool is switched off, or when it is running but not actually being used for a job. This may significantly reduce
exposure over the total working period. Identify additional safety measures to protect the operator from the effects of
noise and/or vibration, for example: maintain the tool and the accessories, keep the hands warm, organization of work
Noise information (measured in accordance with EN 60745‑2‑3):
Typical A-weighted sound power level, LWA
94 dB (A)
Uncertainty for the given sound power level, KWA
3 dB (A)
Uncertainty for the given sound level, KpA
3 dB (A)
Typical A-weighted emission sound pressure level, LpA
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83 dB (A)
Total vibration (vector sum of three directions), measured in accordance with EN 60745‑2‑3
3.8 m/s²
Surface grinding using the vibration-absorbing side
handle, ah,AG
Uncertainty, Kh,AG
Additional information
1.5 m/s²
Other applications, such as cutting, may produce vibration values that deviate from the given values.
6 Before use
6.1 Inserting the battery 5
Check that the power tool is switched off and the
switch interlock activated before fitting the battery.
Before inserting the battery in the power tool, check
to ensure that the battery terminals and the contacts
in the power tool are free from foreign objects.
CAUTION If the battery is not fitted correctly
it may drop out and fall while the work is in
CAUTION A falling battery may present a risk of
injury to yourself and others.
Before beginning the work, check that the battery is
securely seated in the tool.
6.2 Removing the battery from the power tool 6
6.3 Transport and storage of batteries
Fire hazard. Never transport batteries in loose, bulk form.
There is a risk of short circuiting.
Pull the battery out of the locked position (working position) and move it into the first latching position (transport
Observe national and international transport regulations
when shipping batteries (transportation by road, rail, sea
or air).
6.4 Fitting the side handle
Screw the side handle into one of the threaded bushings
6.5 Guards
Wear gloves when fitting or removing parts, when
making adjustments or when remedying malfunctions.
Read the instructions for fitting the corresponding guard.
6.5.1 Fitting guards 7
power tool can be fitted. The locating lugs of the guard
fit into the guard mount on the power tool.
Fit the guard onto the drive spindle collar so that the
two triangular marks on the guard and on the power
tool are in alignment.
Push the guard onto the drive spindle collar; press
the guard release button.
Rotate the guard until it engages and the guard
release button jumps back into its original position. Adjusting the guard
Press the guard release button and then rotate the guard
until it engages in the desired position.
6.5.2 Removing the guard (hood)
Press the guard release button and remove the guard.
6.5.3 Fitting and removing the front cover 8
If you use the front cover, fit it by pushing it onto the
Press the front cover onto the standard guard, with
the closed side positioned as shown in the illustration, until it engages.
To remove the front cover, release the catch and
then pull the front cover away from the standard
6.5.4 Positioning the DC‑EX 125⁄5" cutting guard 9
Take care to ensure that the on / off switch is freely
accessible and operable at all times.
6.6 Fitting and removing discs
Diamond discs must be replaced when the cutting or
grinding performance drops significantly. This generally
is the case when the segments reach a height of less
than 2 mm. Other discs must be replaced when the
cutting performance drops significantly or other parts of
the angle grinder (not the disc) come into contact with
the material you are working on. Abrasive discs generally
have to be replaced when the durability date has been
The guards are equipped with keyed locating lugs that
ensure only guards of a type suitable for use with the
Printed: 16.06.2015 | Doc-Nr: PUB / 5223757 / 000 / 01
6.6.1 Fitting discs 10 11
Tighten the disc and flange securely. If the nut securing
the disc and flange is not tightened firmly, the disc may
work loose from the spindle due to the braking effect of
the power tool’s motor after switching off.
Remove the battery from the power tool.
CAUTION The clamping flange is equipped with
an O-ring. If this O-ring is missing, the clamping
flange must be replaced.
Fit the clamping flange onto the drive spindle (keyed
fit to prevent slipping/rotation).
Fit the disc.
Screw on the clamping nut corresponding to the
type of disc fitted 11.
CAUTION The spindle lockbutton may be
pressed only when the drive spindle is
motionless. There is otherwise a risk of causing
irreparable damage to the gearing or that the disc
works loose.
Press the spindle lockbutton and hold it in this
Use the wrench to tighten the clamping nut securely,
then release the spindle lockbutton and remove the
6.6.2 Removing discs
Remove the battery from the power tool.
Press the drive spindle lockbutton and hold it in this
Release the clamping nut by gripping it with the
wrench and turning the nut counterclockwise.
Release the drive spindle lockbutton and remove
the disc.
When operating the power tool, take care to ensure
that the Kwik lock nut does not come into contact with
the working surface. Do not use a damaged Kwik lock
6.7.1 Fitting discs using the Kwik lock clamping
nut 12
The arrow on the upper surface of the nut must be within
the index marks. If the arrow is not within the index marks
when the nut is tightened it will be impossible to release
the nut by hand. In this case, use the pin wrench to
release the Kwik lock nut (do not use a pipe wrench!).
6.7 Fitting and removing discs using Kwik lock
The Kwik lock nut may be used instead of the standard
clamping nut. No tools are then required for changing
Remove the battery from the power tool.
Clean the clamping flange and the quick-release
clamping nut.
CAUTION The clamping flange is equipped with
an O-ring. If this O-ring is missing, the clamping
flange must be replaced.
Fit the clamping flange onto the drive spindle.
Fit the disc.
Screw the Kwik lock clamping nut onto the spindle
until it contacts the disc (the side with the lettering
should be visible after the nut is screwed on).
CAUTION The spindle lockbutton may be
pressed only when the drive spindle is
motionless. There is otherwise a risk of causing
irreparable damage to the gearing or that the disc
works loose.
Press the spindle lockbutton and hold it in this
Use the wrench to tighten the clamping nut or,
respectively, rotate the disc firmly by hand in a
clockwise direction until the Kwik lock nut is tight,
then release the spindle lockbutton and remove the
wrench (where applicable).
6.7.2 Removing discs secured with Kwik lock
Remove the battery from the power tool.
Release the Kwik lock nut by turning the knurled ring
counterclockwise. (Use the pin wrench to release the
Kwik lock nut if very tight. Do not use a pipe wrench.)
7 Operation
Always use the side handle with the power tool (use
the hoop handle as an option).
The insert tool may get hot during use. Wear protective
gloves when changing insert tools.
7.1 Rough grinding
Never use abrasive cutting discs for grinding.
Printed: 16.06.2015 | Doc-Nr: PUB / 5223757 / 000 / 01
Best results are obtained when the disc maintains an
angle of 5° to 30° with the working surface when grinding.
Move the power tool to and fro while applying moderate
pressure. This will avoid overheating and discoloration of
the workpiece and ensure an even surface finish.
7.2 Cutting
When cutting, apply moderate feed pressure and do not
tilt the power tool or, respectively, the cutting disc (hold
at approx. 90° to the surface being cut). For best results,
start cutting at the smallest cross section when cutting
profiles and square tube.
7.3 On / off switch with switch-on interlock 13
The on / off switch with safety lock (switch-on interlock)
gives you full control of the switch function and avoids
unintentional restarting.
Push the safety lock (switch-on interlock) forward to
unlock the on / off switch and then press the switch
The safety lock (switch-on interlock) returns automatically to the locked position when the on / off
switch is released.
8 Care and maintenance
Repairs to the electrical section of the power tool may
be carried out only by trained electrical specialists.
Before beginning cleaning, remove the battery in order to prevent the electric tool starting unintentionally.
8.1 Care of the power tool
Under extreme conditions, when used for working on
metal, conductive dust may accumulate inside the tool.
This may have an adverse effect on the tool’s protective
insulation. In this case, use of a stationary dust extraction system and frequent cleaning of the ventilation
slots are recommended.
Never operate the power tool when the air vents are
blocked. Regularly clean the power tool’s air vents carefully with a dry brush. Do not permit foreign objects to
enter the interior of the tool. The motor’s fan will draw
dust into the casing and an excessive accumulation of
conductive dust (e.g. metal, carbon fiber) may cause
electrical hazards. Clean the outside of the power tool at
regular intervals with a slightly damp cloth. Do not use
a spray, steam pressure cleaning equipment or running
water for cleaning. This may negatively affect the electrical safety of the tool. Always keep the grip surfaces
of the tool free from oil and grease. Do not use cleaning
agents which contain silicone.
Frequent work on conductive materials (e.g. metal, carbon fiber) may make shorter maintenance intervals necessary. Take your individual work place risk assessment
into account.
8.2 Care of the Li‑ion battery
Battery performance drops at low temperatures.
Store the battery in a cool and dry place.
In order to achieve maximum battery life, stop using the
battery as soon as a significant drop in battery performance is noticed.
- If use continues, further battery discharge will be
stopped automatically before the battery cells suffer
- Charge the batteries using the specified and approved
Hilti battery chargers for Li‑ion batteries.
8.3 Checking the power tool after care and
After carrying out care and maintenance work on the
power tool, check that all protective and safety devices
are fitted and that they function faultlessly.
9 Troubleshooting
Possible cause
The battery runs down more
quickly than usual.
The battery doesn’t engage with
an audible click.
Very low ambient temperature.
Allow the battery to warm up slowly
to room temperature.
Clean the retaining lugs and push the
battery in until it engages. Contact
Hilti Service if the problem persists.
Charge the battery.
LED 1 blinks.
The retaining lugs on the battery are
The battery is discharged.
The tool is overloaded (application
limits exceeded).
The power tool doesn’t run and
1 LED blinks.
The battery is discharged.
Use the right power tool for the job
(don’t use a low-powered tool for
heavy work).
Change the battery and charge the
empty battery.
Printed: 16.06.2015 | Doc-Nr: PUB / 5223757 / 000 / 01
Possible cause
The power tool doesn’t run and
1 LED blinks.
The tool doesn’t work and all 4
LEDs blink.
The battery is too hot or too cold.
Bring the battery to the recommended working temperature.
Release the switch and press it again.
The power tool or the battery
becomes very warm.
The power tool has been overloaded
The overheating prevention cut-out
has been activated.
Electrical fault.
A battery with inadequate capacity
was used.
The battery is discharged.
Switch the power tool off immediately, remove the battery from the
tool and allow it to cool down while
keeping an eye on it, contact Hilti
Use the right power tool for the job
(don’t use a low-powered tool for
heavy work).
Use a battery with a capacity of at
least 2.6 Ah.
Charge the battery.
The tool is overloaded (application
limits exceeded).
Switch the power tool off and on
The power tool has been overloaded
(application limits exceeded).
The power tool doesn’t achieve
full power.
No braking function.
Allow the power tool to cool down.
10 Disposal
Improper disposal of the equipment may have serious consequences: the burning of plastic components generates
toxic fumes which may present a health hazard. Batteries may explode if damaged or exposed to very high
temperatures, causing poisoning, burns, acid burns or environmental pollution. Careless disposal may permit
unauthorized and improper use of the equipment. This may result in serious personal injury, injury to third parties and
pollution of the environment.
Dispose of defective batteries right away. Keep them out of reach of children. Do not disassemble or incinerate the
Batteries that have reached the end of their life must be disposed of in accordance with national regulations or returned
to Hilti.
Most of the materials from which Hilti power tools or appliances are manufactured can be recycled. The materials
must be correctly separated before they can be recycled. In many countries, Hilti has already made arrangements for
taking back your old power tools or appliances for recycling. Please ask your Hilti customer service department or
Hilti representative for further information.
For EC countries only
Disposal of electric tools together with household waste is not permissible.
In observance of the European Directive on waste electrical and electronic equipment and its implementation in accordance with national law, electrical appliances that have reached the end of their life
must be collected separately and returned to an environmentally compatible recycling facility.
Printed: 16.06.2015 | Doc-Nr: PUB / 5223757 / 000 / 01
11 Manufacturer’s warranty - tools
Please contact your local Hilti representative if you have
questions about the warranty conditions.
12 EC declaration of conformity (original)
Year of design:
Angle grinder
AG 125-A22
Hilti Corporation, Feldkircherstrasse 100,
FL‑9494 Schaan
We declare, on our sole responsibility, that this product
complies with the following directives and standards:
2006/42/EC, until 19th April 2016: 2004/108/EC, from
20th April 2016: 2014/30/EU, 2006/66/EC, 2011/65/EU,
EN 60745‑1, EN 60745‑2‑3, EN ISO 12100.
Paolo Luccini
Head of BA Quality and Process Management
Business Area Electric Tools & Accessories
Tassilo Deinzer
Executive Vice President
Business Unit Power
Tools & Accessories
Technical documentation filed at:
Hilti Entwicklungsgesellschaft mbH
Zulassung Elektrowerkzeuge
Hiltistrasse 6
86916 Kaufering
Printed: 16.06.2015 | Doc-Nr: PUB / 5223757 / 000 / 01
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