KRESS KU800 User manual

Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9

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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
9
710
9
7
10
2
1
C1
15o-30o
C3
1
2
A2
A1
B
C2
A1
A3
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G
F
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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
9
710
9
7
10
2
1
C1
15o-30o
C3
1
2
A2
A1
B
C2
A1
A3
E
G
F
DC3
C1

6
Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
GENERAL POWER TOOL
SAFETY WARNINGS
WARNING 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 battery-
operated (cordless) power tool.
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. 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.
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
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.
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 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

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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
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.
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.
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.
SAFETY INSTRUCTIONS
FOR ALL OPERATIONS
Safety Warnings Common for Grinding or
Abrasive Cutting-Off Operations:
a) 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,
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 time.
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. Prolonged 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 operation.
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) Never lay the power tool down until the
accessory has come to a complete stop. The

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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
spinning accessory may grab the surface and
pull the power tool out of your control.
l) 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.
m) 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.
n) Do not operate the power tool near
flammable materials. Sparks could ignite these
materials.
o) Do not use accessories that require liquid
coolants. Using water or other liquid coolants
may result in electrocution or shock.
Further safety instructions for all operations
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 conditions.
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.
a) 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.
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.
Safety Warnings Specific for Grinding and
Abrasive Cutting-Off Operations:
a) 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 protected.
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 the 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
flanges.
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.
Additional Safety Warnings Specific for Abrasive
Cutting-Off Operations:
a) 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

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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
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.
SAFETY WARNINGS FOR
BATTERY PACK
a) Do not dismantle, open or shred cells or
battery pack.
b) Do not short-circuit a battery pack. Do not
store battery packs haphazardly in a box or
drawer where they may short-circuit each
other or be short-circuited by conductive
materials. 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.
c) Do not expose battery pack to heat or fire.
Avoid storage in direct sunlight.
d) Do not subject battery pack to mechanical
shock.
e) In the event of battery leaking, do not allow
the liquid to come into contact with the skin
or eyes. If contact has been made, wash the
affected area with copious amounts of water
and seek medical advice.
f) Seek medical advice immediately if a cell or
battery pack has been swallowed.
g) Keep battery pack clean and dry.
h) Wipe the battery pack terminals with a clean
dry cloth if they become dirty.
i) Battery pack needs to be charged before use.
Always refer to this instruction and use the
correct charging procedure.
j) Do not maintain battery pack on charge when
not in use.
k) After extended periods of storage, it may
be necessary to charge and discharge
the battery pack several times to obtain
maximum performance.
l) Battery pack gives its best performance
when it is operated at normal room
temperature (20 °C ± 5 °C).
m) When disposing of battery packs, keep
battery packs of different electrochemical
systems separate from each other.
n) Recharge only with the charger specified
by Worx. Do not use any charger other than
that specifically provided for use with the
equipment. A charger that is suitable for one type
of battery pack may create a risk of fire when used
with another battery pack.
o) Do not use any battery pack which is not
designed for use with the equipment.
p) Keep battery pack out of the reach of
children.
q) Retain the original product literature for
future reference.
r) Remove the battery from the equipment
when not in use.
s) Dispose of properly.
t) Do not mix cells of different manufacture,
capacity, size or type within a device.
u) Do not remove battery pack from its original
packaging until required for use.
v) Observe the plus (+) and minus (–) marks on
the battery and ensure correct use.
SYMBOLS
To reduce the risk of injury, user must
read instruction manual
Warning
Wear ear protection
Wear eye protection
Wear dust mask
Li-Ion
Li-Ion
Do not dispose of batteries. Return
exhausted batteries to your local
collection or recycling point.
Do not expose to rain or water
Do not burn

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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
Wear protective gloves.
Make sure the battery is removed prior
to changing accessories.
COMPONENT LIST
1. AUXILIARY HANDLE
2. SPINDLE LOCK BUTTON
3. ON/OFF SWITCH
4. BATTERY PACK RELEASE BUTTON *
5. BATTERY PACK *
6. WHEEL GUARD FOR GRINDING
7. DISC *
8. SPANNER
9. INNER FLANGE
10. OUTER FLANGE
11. GUARD LOCKING SCREW
12. SPINDLE
* Not all the accessories illustrated or described
are included in standard delivery.
TECHNICAL DATA
KU800 KU800.2 KU800.3 KU800.9
Charger voltage 100-240V~ 50/60Hz
Rated voltage 20V
No load speed 8500/min
Disc size 100mm
Disc bore 16mm
Spindle thread M10
Machine
weight 2.4kg 1.7kg
ACCESSORIES
KU800 KU800.2 KU800.3 KU800.9
Spanner 1 1 1 1
Auxiliary
handle 1 1 1 1
Wheel
guard for
grinding
1 1 1 1
Battery pack
(KPB2004) 2 2 / /
Battery pack
(KA3498) / / 2 /
Charger
(KA3705) / 1 1 /
Charger
(KCH2006) 1 / / /
Press-
ing plate
（15mm）/ 1 / /
Press-
ing plate
（16mm）/ 1 / /
We recommend that you purchase your accessories
listed in the above list from the same store that sold
you the tool. Refer to the accessory packaging for
further details. Store personnel can assist you and
offer advice.
OPERATING
INSTRUCTIONS
Note: Before using the tool, read the
instruction book carefully.
INTENDED USE
The machine is intended for cutting, roughing and
brushing metal and stone materials without using
water. For cutting metal, a special protection guard
for cutting (accessory) must be used.
ASSEMBLY AND OPERATION
ACTION FIGURE
ASSEMBLY
Assembling Auxiliary Handle See Fig. A

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Lithium-Ion Brushless
Angle Grinder
KU800 KU800.2
KU800.3 KU800.9
Assembling Grinding/Cutting
Disc/Pressing plate
Note: Please select the
right pressing plate in line
with the actual situation.
See Fig. B1,
B2, B3
Adjusting Wheel Guard
Note: Before any work on
the machine itself, remove
the battery pack. For work
with grinding or cutting
discs, the protection guard
must be mounted. Use the
correct type of disc for your
application. If the power
tool is intended to perform
cutting off operations,
a guard specific for this
operation must be fitted.
Place the guard in the groove on
the spindle collar and rotates to
the required working position.
Clamp the guard with the screw.
The grinding disc must be rotate
freely within the guard.
The closed side of the wheel
guard must always point to
the operator.
See Fig. C
OPERATION
Using On/Off Switch See Fig. D
Hand Grip Areas See Fig. E
Rough Grinding
Warning! Never use
a cutting disc for
roughing.
Cutting See Fig. F
WORKING HINTS FOR
YOUR ANGLE GRINDER
1. Always start at no load to achieve maximum
speed then start working.
2. Do not force the disc to work faster, reducing the
Disc’s moving speed means longer working time.
3. Always work with a 15-30 angle between disc and
workpiece. Larger angles will cut ridges into the
workpiece and affect the surface finish. Move the
angle grinder across and back and forth over the
workpiece.
4. When using a cutting disc never change the
cutting angle otherwise you will stall the disc and
angle grinder motor or break the disc. When cutting,
only cut in the opposite direction to the disc rotation.
If you cut in the same direction as the disc rotation
the disc may push itself out of the cut slot.
5. When cutting very hard material best results can
be achieved with a diamond disc.
6. When using a diamond disc it will become very
hot. If this happens you will see a full ring of sparks
around the rotating disc. Stop cutting and allow to
cool at no load speed for 2-3 minutes.
7. Always ensure the workpiece is firmly held or
clamped to prevent movement.
MAINTENANCE
Remove the battery before carrying out any
adjustment, servicing or maintenance.
There are no user serviceable parts in your power
tool. Never use water or chemical cleaners to clean
your power tool. Wipe clean with a dry cloth. Always
store your power tool in a dry place. Keep the motor
ventilation slots clean. Keep all working controls free
of dust. Occasionally you may see sparks through the
ventilation slots.This is normal and will not damage
your power tool.
TROUBLESHOOTING
Although your new angle grinder is really very
simple to operate, if you do experience problems,
please check the following:
1. If your grinder wheel wobbles or vibrates, check
that outer flange is tight; check that the wheel is
correctly located on the flange plate.
2. If there is any evidence that the wheel is
damaged do not use as the damaged wheel may
disintegrate, remove it and replace with a new
wheel. Dispose of old wheels sensibly.
3. If working on aluminum or a similar soft alloy,
the wheel will soon become clogged and will not
grind effectively.
ENVIRONMENTAL
PROTECTION
Disposal
The machine, its accessories and
packaging materials should be sorted
for environmentally friendly recycling.The plastic
components are labeled for categorized recycling.

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AR01555800