Rockwell RD4740 User manual

RD4740
750W ANGLE GRINDER EN

RD4740
321
10 9 8 7 6
4A
5
4
1
2
A1 A2 B
C1 C2 C3
C4 D1 D2
D3 E1 E2
F1 F2 G

RD4740
1
2
A1 A2 B
C1 C2 C3
C4 D1 D2
D3 E1 E2
F1 F2 G

5
750W ANGLE GRINDER EN
COMPONENT LIST
1Auxiliary Handle
2Spindle Locking Button
3On/Off Switch
4A Grinding Disc*(not included)
4Protection Guard for Grinding
5Spanner
6Inner Flange
7Outer Flange
8Guard ClampingLever
9Coded Projection
10 Protection Guard for Cutting*
*Not all the accessories illustrated or described are included in standard delivery.
ACCESSORIES
Auxiliary Handle 1
Protection Guard For Grinding 1
Spanner 1
We recommend that you purchase your accessories 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.

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750W ANGLE GRINDER EN
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, re 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
ammable 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. Unmodied 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 inuence 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
nger 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
these devices 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

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750W ANGLE GRINDER EN
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.
5. SERVICE
a) Have your power tool serviced by a qualied
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 specications
provided with this power tool. Failure to follow
all instructions listed below may result in electric
shock, re and/or serious injury.
b) Operations such as sanding, wire brushing or
polishing is 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
specically 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 y 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 anges, the arbour hole of the
accessory must t the locating diameter of
the ange. 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 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 ying
debris generated by various operations . The dust
mask or respirator must be capable of ltrating
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 y
away and cause injury beyond immediate area of
operation.
j) Hold power tool by insulated gripping surfaces
only, when performing an operation where the
cutting accessory may contact hidden wiring
or its own cord. Cutting accessory contacting a
“live” wire may make exposed metal parts of the
power tool “live” and shock the operator.
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 accessory.
l) Never lay the power tool down until the
accessory has come to a complete stop. The

8
750W ANGLE GRINDER EN
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 ammable
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.
q) Recommendation that the tool always be
supplied via a residual current device with a rated
residual current of 30 mA or less.
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 rm 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.
ADDITIONAL SAFETY
INSTRUCTIONS FOR GRINDING
AND CUTTING-OFF OPERATIONS
Safety Warnings Specic for Grinding and Abrasive
Cutting-Off Operations:
a) Use only wheel types that are recommended for
your power tool and the specic 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 operator
from broken wheel fragments and 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 anges that
are of correct size and shape for your selected
wheel. Proper wheel anges support the wheel
thus reducing the possibility of wheel breakage.
Flanges for cut-off wheels may be different from
grinding wheel anges.

9
750W ANGLE GRINDER EN
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
INSTRUCTIONS FOR CUTTING-OFF
OPERATIONS
Additional Safety Warnings Specic 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 and
carefully reenter 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.
SYMBOLS
To reduce the risk of injury, user
must read instruction manual
Warning
Wear ear protection
Wear eye protection
Wear dust mask
Double insulation
RCM marking
TECHNICAL DATA
Voltage 230-240V~50 Hz
Power 750 W
Rated speed 11000 /min
Disc size 125 mm
Disc bore 22.2 mm
Spindle thread M14
Protection class /II
Machine Weight 2.1 kg
OPERATING INSTRUCTIONS
NOTE: Before using the tool, read the instruction
book carefully.
ABN: Australian Business Number. By this number,
business information such as entity type, status,
business location etc. can be found at website
http://abr.business.gov.au.
ABN of Positec Australia Pty Ltd is 14 101 682 357

10
750W ANGLE GRINDER EN
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 (not supplied) must be used.
ASSEMBLY AND ADJUSTMENT
MOUNTING THE PROTECTIVE DEVICES
1. AUXILIARY HANDLE (See Fig. A1, A2)
For all work with the machine, the auxiliary handle
(1) must be mounted.
Screw the auxiliary handle (1) on the right or left of the
machine head depending on the working method.
WARNING! Do not make any alterations to the
auxiliary handle.
Do not continue to use an auxiliary handle if it is
damaged.
MOUNTING THE GRINDING TOOLS
Before any work on the machine itself, pull the
mains plug.
Grinding and cutting discs become very hot while
working; do not touch until they have cooled.
1. Spindle Locking Button (See Fig. B)
Clean the grinder spindle and all parts to be mounted.
For clamping and loosening the grinding tools, lock the
grinder spindle with the Spindle Locking Button (2).
WARNING: Actuate the Spindle Locking
Button (2) only when the grinder spindle is at
a standstill!
2. Assembling the Protection Guards (See Figs.
C1-C4)
Open the guard clamping lever (8). Put the protection
guard down rmly. (See Fig. C1)
Place the protection guard with coded projection (9)
into the coded groove on the spindle collar of the
machine head and rotate to the required position
(working position). (See Fig. C2,C3)
To fasten the protection guard, close the guard
clamping lever (8). (See Fig. C4)
The closed side of the protection guard must always
point to the operator.
WARNING! Before any work on the machine
itself, pull the mains plug.
For work with grinding or cutting discs, the
protection guard must be mounted.
3. Grinding/Cutting Disc (See Fig. D1-D3)
Place the inner ange (6) onto the spindle.
(See Fig. D1)
Place the disc on the tool spindle and inner ange.
Ensure it is correctly located.
Pay attention to the dimensions of the grinding
disc. The mounting hole diameter must t the inner
ange (6) without play. Do not use reducers or
adapters.
When using a diamond cutting disc, take care that the
direction-of-rotation arrow on the diamond cutting
disc and the direction of rotation of the machine
(direction-of-rotation arrow on the machine head)
agree. (See Fig. D2)
Screw on the outer ange (7) with the provided
spanner (5). (See Fig. D3)
4. Adjustable outer ange clamping(See Fig. E1, E2)
The outer ange (7) should be adjusted to suit
different disc thickness. For thicker grinding discs the
raised part of the outer ange is tted facing towards
the disc to provide improved support for the disc hole
(See Fig. E1). For thinner cutting or diamond discs
the raised part of the outer ange is tted facing away
from the disc. (See Fig. E2). Always ensure your disc
is securely clamped.
OPERATION
Starting Operation
To start the power tool, push the on/off switch (3)
forward.
To lock the on/off switch for continuous use, push the
on/off switch (3) forward then press down at the front
until it engages (See Fig. F1).
To switch off the power tool, release the on/off switch
(3) or, if it is locked, briey push down the back of the
on/off switch (3) and then release it. (See Fig. F2)
Operating Instructions
- Clamp the workpiece if it does not remain
stationary due to its own weight.
- Do not strain the machine so heavily that it comes
to a standstill.
- Grinding and cutting discs become very hot while
working; after work do not touch until they have
cooled.
- Pull the plug from the socket-outlet when not
using the machine. With the plug inserted and

11
750W ANGLE GRINDER EN
mains voltage existing, the power tool still has low
power consumption even when it switched off.
1. Hand grip areas (See Fig. G)
Always hold your angle grinder rmly with both hands
when operating (See Fig. G).
2. Rough Grinding
The best roughing results are achieved when setting
the machine at an angle of 30° to 40°. Move the
machine back and forth with moderate pressure. In
this manner, the workpiece will not become too hot,
does not discolour and no grooves are formed.
WARNING! Never use a cutting disc for
roughing.
3. Cutting
WARNING! For cutting metal, always work
with the wheel guard for cutting (not
supplied).
When cutting, do not press, tilt or oscillate the
machine. Work with moderate feed, adapted to the
material being cut.
Do not reduce the speed of running down cutting
discs by applying sideward pressure.
The direction in which the cutting is performed is
important.
The machine must always work in an up-grinding
motion. Therefore, never move the machine in the
other direction! Otherwise, the danger exists of it
being pushed uncontrolled out of the cut.
WORKING HINTS FOR YOUR
GRINDER
If your power tool becomes too hot, run no load for 2-3
minutes to cool the motor.
Never start your angle grinder with the disc/ accessory
in contact with the workpiece.
Always start at no load to achieve maximum speed
then start working.
Do not force the disc to work faster, reducing the
Disc’s moving speed means longer working time.
When grinding, always work with a 30° to 40° angle
between disc and workpiece. Larger angles will cut
ridges into the workpiece and affect the surface nish.
Move the angle grinder across and back and forth over
the workpiece.
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.
When cutting very hard material best results can be
achieved with a diamond disc.
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 cooling at no
load speed for 2-3 minutes.
Always ensure the workpiece is rmly held or clamped
to prevent movement.
MAINTENANCE
Remove the plug from the socket before carrying
out any adjustment, servicing or maintenance.
Your power tool requires no additional lubrication 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.
If the supply cord is damaged, it must be replaced
by the manufacturer, its service agent or similarly
qualied persons in order to avoid a hazard.
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 will not operate check the power at
the main plug.
2. If your grinder wheel wobbles or vibrates, check
that outer ange is tight, check that the wheel is
correctly located on the ange plate.
3. 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.
4. If working on aluminum or a similar soft alloy, the
wheel will soon become clogged and will not grind
effectively.

POSITEC AUSTRALIA PTY LTD
ABN 14 101 682 357
MADE IN PRC
Copyright © 2018, Positec. All Rights Reserved.