KRESS KU420 Installation manual

Circular Saw KU420
SAFETY AND OPERATING MANUAL

3
Circular Saw KU420
PRODUCT SAFETY
GENERAL POWER TOOL
SAFETY WARNINGS
WARNING: 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
(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 and clothing
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.
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

4
Circular Saw KU420
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) 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 SAWS
CUTTING PROCEDURES
a) DANGER: Keep hands away from
cutting area and the blade. Keep
your second hand on auxiliary handle, or
motor housing. If both hands are holding the
saw, they cannot be cut by the blade.
b) Do not reach underneath the workpiece.
The guard cannot protect you from the blade
below the workpiece.
c) Adjust the cutting depth to the thickness of
the workpiece. Less than a full tooth of the blade
teeth should be visible below the workpiece.
d) Never hold workpiece in your hands or
across your leg while cutting. Secure the
workpiece to a stable platform. It is important
to support the work properly to minimise body
exposure, blade binding, or loss of control.
e) Hold the power tool by insulated gripping
surfaces only, when performing an
operation where the cutting tool may
contact hidden wiring or its own cord.
Contact with a "live" wire will also make exposed
metal parts of the power tool "live" and could give
the operator an electric shock.
f) When ripping always use a rip fence or
straight edge guide. This improves the accuracy
of cut and reduces the chance of blade binding.
g) Always use blades with correct size and
shape (diamond versus round) of arbour
holes. Blades that do not match the mounting
hardware of the saw will run off-centre, causing
loss of control.
h) Never use damaged or incorrect blade
washers or bolt. The blade washers and bolt
were specially designed for your saw, for optimum
performance and safety of operation.
FURTHER SAFETY
INSTRUCTIONS FOR ALL
SAWS
KICKBACK CAUSES AND
RELATED WARNINGS
— kickback is a sudden reaction to a pinched, bound
or misaligned saw blade, causing an uncontrolled
saw to lift up and out of the workpiece toward the
operator;
— when the blade is pinched or bound tightly by the
kerf closing down, the blade stalls and the motor
reaction drives the unit rapidly back toward the
operator;
— if the blade becomes twisted or misaligned in the
cut, the teeth at the back edge of the blade can dig
into the top surface of the wood causing the blade
to climb out of the kerf and jump back toward the
operator.
Kickback is the result of saw misuse and/or incorrect
operating procedures or conditions and can be avoided
by taking proper precautions as given below.
a) Maintain a firm grip with both hands on
the saw and position your arms to resist
kickback forces. Position your body to
either side of the blade, but not in line with
the blade. Kickback could cause the saw to jump
backwards, but kickback forces can be controlled
by the operator, if proper precautions are taken.
b) When blade is binding, or when interrupting
a cut for any reason, release the trigger
and hold the saw motionless in the material
until the blade comes to a complete stop.
Never attempt to remove the saw from the
work or pull the saw backward while the
blade is in motion or kickback may occur.
Investigate and take corrective actions to eliminate
the cause of blade binding.
c) When restarting a saw in the workpiece,
centre the saw blade in the kerf and check
that saw teeth are not engaged into the
material. If saw blade is binding, it may walk
up or kickback from the workpiece as the saw is
restarted.
d) Support large panels to minimise the risk
of blade pinching and kickback. Large
panels tend to sag under their own weight.
Supports must be placed under the panel on both
sides, near the line of cut and near the edge of the
panel.
e) Do not use dull or damaged blades.
Unsharpened or improperly set blades produce
narrow kerf causing excessive friction, blade
binding and kickback.

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Circular Saw KU420
f) Blade depth and bevel adjusting locking
levers must be tight and secure before
making cut. If blade adjustment shifts while
cutting, it may cause binding and kickback.
g) Use extra caution when sawing into
existing walls or other blind areas. The
protruding blade may cut objects that can cause
kickback.
SAFETY INSTRUCTIONS
FOR SAWS (CIRCULAR
SAW WITH INNER
PENDULUM GUARD)
LOWER GUARD
FUNCTION
a) Check lower guard for proper closing
before each use. Do not operate the saw
if lower guard does not move freely and
close instantly. Never clamp or tie the
lower guard into the open position. If saw is
accidentally dropped, lower guard may be bent.
Raise the lower guard with the retracting handle
and make sure it moves freely and does not touch
the blade or any other part, in all angles and depths
of cut.
b) Check the operation of the lower guard
spring. If the guard and the spring are not
operating properly, they must be serviced
before use. Lower guard may operate sluggishly
due to damaged parts, gummy deposits, or a build-
up of debris.
c) Lower guard may be retracted manually
only for special cuts such as "plunge cuts"
and "compound cuts." Raise lower guard by
retracting handle and as soon as blade enters the
material, the lower guard must be released. For
all other sawing, the lower guard should operate
automatically.
d) Always observe that the lower guard is
covering the blade before placing saw
down on bench or floor. An unprotected,
coasting blade will cause the saw to walk
backwards, cutting whatever is in its path. Be
aware of the time it takes for the blade to stop after
switch is released.
ADDITIONAL SAFETY
RULES FOR YOUR
CIRCULAR SAW
1. Only use saw blades recommended in the
specication.
2. Do not use any abrasive wheels.
3. Use only blade diameter(s) in accordance with the
markings.
4. Identify the correct saw blade to be used for the
material to be cut.
5. Use only saw blades that are marked with a speed
equal or higher than the speed marked on the tool.
SYMBOL
To reduce the risk of injury, user must
read instruction manual
Double insulation
Warning
Wear ear protection
Wear eye protection
Wear dust mask

6
Circular Saw KU420
9
2
18
21
7
19
5
17
4
6
15
16
13
14
8
11
3
1
10
7
12

7
Circular Saw KU420
Correct
7
3
Incorrect
DC
BA
E F

8
Circular Saw KU420
20
13
J1I
HG
J2

9
Circular Saw KU420
COMPONENT LIST
1. Safety on/off switch
2. Fixed guard
3. Base plate
4. Movable guard
5. Movable guard lever
6. Saw blade
7. Base plate bevel lock
8. Lock off button
9. Spindle lock button
10. Depth adjustment knob
11. Depth of cut scale
12. Socket spanner
13. Dust extraction outlet
14. Inner flange
15. Saw blade bolt
16. Outer flange
17. Spindle
18. Base plate angle scale
19. Cutting guide notch
20.
Vacuum adaptor (See Fig. I) *
21. Parallel guide
22. Adapter
* Not all the accessories illustrated
or described are included in standard
delivery.
TECHNICAL DATA
Type KU420 (4 - designation of
machinery, representative of circular
saw)
Rated voltage 220-230V~50Hz
Rated input power 1400W
Rated no load
speed 5200r/min
Blade size 185 mm
Blade Bore 20mm
Protection class /II
Cutting capacity
Cutting depth at 90° 64mm
Cutting depth at 45° 45mm
Machine weight 4.2kg
ACCESSORIES
Socket spanner 1
Parallel guide 1
Wheel center hub ring 1
Use the saw blades with following
specications:
185mm diameter, 20mm bore, 24-teeth
Note: The blades and vacuum adapter listed
in above may vary depending on the model
conguration. Some congurations are not
equipped with the blades and vacuum adapters
listed above.
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.

10
Circular Saw KU420
OPERATING
INSTRUCTIONS
1. ON/OFF SWITCH
In order to prevent accidental starting, the saw is
equipped with a lock off button. When starting the
circular saw, depress the lock off button then the
safety on/off switch, and release the lock off button,
the machine starts running. To switch off just
release the on/off switch.
2. HAND GRIP POSITION
Hold the machine with both hands while working
and make sure it is stable and secure. Fig. A and B
respectively shows the correct and incorrect ways
to support a large workpiece.
3. FITTING/REMOVING THE SAW BLADE
(Machine parts diagram)
Warning: Except for the saw blade uninstalled
(included in the package), this circular saw has
been completely installed.
Please carefully inspect the saw blade before
replacement to ensure that the saw blade is not
damaged during transportation.
When removing the saw blade, press the spindle
lock button to prevent the spindle from rotating.
Then loosen the bolt with the socket spanner. Now
remove the outer ange, then lift the movable guard
as far as possible and remove the saw blade. When
replacing the saw blade, hold the movable guard
lever and turn the movable guard clockwise to
open. Make sure that the bore of the blade is on
the inner ange and that the arrow direction of the
blade is the same as that of the movable guard.
Keep the surface of the blade and the press plates
clean. Press the spindle lock button again so that
the outer ange is against the spindle shoulder.
After tightening the blade bolt by hand as far as
possible, tighten an additional 1/4 turn by the
spanner and check whether the blade has been
tightened.
WARNING: Blade teeth are very sharp.
For best cutting results ensure you use a blade
suited to the material and cut quality you need.
4. DEPTH OF CUT ADJUSTMENT
Lift the depth adjustment knob up to raise the body
away from the base plate. Set the cutting depth
using the scale then push the depth locking knob
down to lock (Fig. C, D). In order to be able to cut
the workpiece, it is necessary to set the depth 3
mm thicker than the that of the workpiece.
5. BASE PLATE
Adjusting the angle of the base plate enables bevel
cutting (Fig. E). The base plate must always be
held rmly against the surface of the workpiece to
reduce saw vibration, blade jumping or breakage.
(Fig. F, G)
6. BEVEL CUTTING ADJUSTMENT
Loosen the two base plate bevel lock on the base
plate, rotate the base plate to the desired base plate
angle scale and lock with the lock button (Fig. E).
Then, check the bevel angle of the base plate and
make sure it is rmly locked. Generally, the scale
on the base plate is accurate. However, you are still
recommended to use the protractor or test on the
workpiece before cutting in case you need a precise
angle cutting. While using bevel cuts, please do not
use depth scale to avoid possible errors.
7. CUTTING GUIDE
For straight cutting, keep the 0-degree mark line
of the cutting guide notch on the same line as the
cutting line on the workpiece; while for a 45 degree
angle cut, align it with the 45-degree mark line.
8. PARALLEL GUIDES ADJUSTMENT
To ensure accurate straight cutting, please make
the cut of the circular saw parallel to the edge of the
required cutting distance of the workpiece. Slide the
parallel guide to the required cutting distance and
lock it (Figure H). Parallel guides can be inserted
from both ends of the base plate. The cutting
distance is indicated on the scale of the guide by
the cutting guide notch of 0 to 45 degrees. You
can check whether the cutting distance set by the
machine is correct or not by trial cutting.
9. DUST EXTRACTION OUTLET
To keep tidy, a dust cleaner (such as a vacuum
cleaner) can be attached to the circular saw.
Connect the vacuum adapter to the dust extraction
outlet of the circular saw and connect the hose of
vacuum cleaner to the vacuum adapter. Make sure
the connection to the vacuum adapter is safe (Fig.
I).

11
Circular Saw KU420
WORKING HINTS FOR
YOUR CIRCULAR SAW
If the machine is severely hot, please let your
machine run for 2~3 minutes without any load for
cooling. Try to avoid continuous use at a low speed.
If your power tool becomes overheated,
Always cut with a blade with proper materials and
thickness. The more teeth of the saw, the better
quality. Always ensure that the workpiece is xed or
clamped to prevent movement. Keep close to the
cutting line when supporting the large panel. Any
movement of the workpiece may affect the cutting
quality. Since the cuts of the upwards saw blade
may cause torn burr on the top surface/edge, so
make the side used for appearance downwards
when cutting. Cutting too fast may signicantly
reduce the performance of the tool and the life of
the saw blade. Always keep the better surface of
the workpiece downwards to ensure the opening as
small as possible. Only sharp blades of the correct
size will be used.
Rip saws (for softer materials only) can only
be operated by people who are skilled and
experienced.
WARNING: During this operation, the saw
tooth are exposed, so please pay special
attention to safety.
Clearly mark the area to be cut on the workpiece,
set the cutting depth on the machine, and place the
front edge of the base plate used for the machine
against the surface of the workpiece (Fig. J1, J2);
the cutting guide indication coincides with the
surface marking line of the workpiece. Ensure
that the saw blade is close to the surface of the
workpiece without contact, and turn the guard lever
to open the movable shield. For turning on, take
the front edge of the base plate as a pivot point
and slowly cut the saw blade into the workpiece.
Wait until the saw blade is completely cut into the
workpiece, and then the movable guard can be
released for normal operation.
MAINTENANCE
Your power tool requires no additional lubrication
or maintenance. There is no parts requiring special
maintenance Only simple maintenance on the
machine is needed according to the following
requirements.
1. Wipe clean with a dry cloth. Never use water or
chemical cleaners to clean your power tool to avoid
compromise on the performance of the machine
shell or causing accidents such as electric leakage.
2. Always keep the air inlet clean and unobstructed,
and prevent debris from being accumulated at the
air inlet, which may affect the cooling of motor.
In addition, try not to use it in dusty environment.
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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