Worx WU278.1 User manual

LITHIUM-ION BRUSHLESS IMPACT WRENCH WU278.1
LITHIUM-ION BRUSHLESS IMPACT DRIVER WU292 WU292.1
SAFETY AND OPERATING MANUAL
ORIGINAL INSTRUCTIONS

1
2
3
4
5
6
7
8
10
9

2
1
100%
0%
A2
A1
A4A3
B2
B1
A3
A1

C2
C1
D2D1
C4C3
D3
1: 1300/min
2: 2100/min
3: 2900/min
E
F

C2
C1
D2D1
C4C3
D3
1: 1300/min
2: 2100/min
3: 2900/min
E
F

6
COMPONENT LIST
1. Forward/Reverse rotation control
2. Battery pack *
3. Hook
4. Battery pack release button
5. On/off switch
*Not all the accessories illustrated or described are included in standard delivery.
TECHNICAL DATA
Type WU278.1 (278-designation of machinery, representative of Impact Wrench )
WU292 WU292 .1(292-designation of machinery, representative of Impact
WU278.1 WU292 WU292.1
Voltage 20V Max**
No-load speed 0-1300/2100/2900/min
Impact rate 0-1600/2900/3300bpm
Max torque 100/180/300N.m 60/105/175N.m
Chuck size 1/2”(13mm) 1/4”(6.35mm)
Machine Weight 1.7kg 1.44kg
** Voltage measured without workload. Initial battery voltage reaches maximum of 20 volts. Nominal
voltage is 18 volts.
NOISE INFORMATION
A weighted sound pressure LpA: 78.1dB(A)
A weighted sound power LwA: 89.1dB(A)
KpA& KwA 3.0dB(A)
Wear ear protection when sound pressure is over 80dB(A)
VIBRATION INFORMATION
Vibration total values (triax vector sum) determined according to EN 60745:
Typical weighted vibration Vibration emission value: ah= 9,457m/s2
Uncertainty K = 1.5m/s²
The declared vibration total value may be used for comparing one tool with another, and may also be
used in a preliminary assessment of exposure.
Warning: The vibration emission value during actual use of the power tool can differ from the
declared value depending on the ways in which the tool is used dependant on the following examples
and other variations on how the tool is used:
How the tool is used and the materials being cut or drilled.
The tool being in good condition and well maintained
6. Sight light
7. Collet locking sleeve
8. Square driver (Only for WU278.1)
9. Battery Capacity Indicator
10. Bit Clip (Only for WU292 WU292.1)

7
The use the correct accessory for the tool and ensuring it is sharp and in good condition.
The tightness of the grip on the handles and if any anti vibration accessories are used.
And the tool is being used as intended by its design and these instructions.
This tool may cause hand-arm vibration syndrome if its use is not adequately managed.
Warning: To be accurate, an estimation of exposure level in the actual conditions of use should also
take account of all parts of the operating cycle such as the times when the tool is switched off and
when it is running idle but not actually doing the job. This may significantly reduce the exposure level
over the total working period.
Helping to minimize your vibration exposure risk.
ALWAYS use sharp chisels, drills and blades.
Maintain this tool in accordance with these instructions and keep well lubricated (where appropriate).
If the tool is to be used regularly then invest in anti vibration accessories.
Avoid using tools in temperatures of 100C or less.
Plan your work schedule to spread any high vibration tool use across a number of days.
ACCESSORIES
WU278.1 WU292 WU292.1
20V 5.0Ah Li-Ion Battery pack WA3564 2 2 /
16V/20V 6A Charger WA3861 1 1 /
20V 2.0Ah Li-Ion Battery Pack WA3561 / / 2
16V/20V 3A Charger WA3851 / / 1
Hook 1 1 1
Bit clip / 1 1
We recommend that you purchase your accessories from the same store that sold you the tool. Use
good quality accessories marked with a well-known brand name. Choose the type according to the
work you intend to undertake. Refer to the accessory packaging for further details. Store personnel can
assist you and offer advice.

8
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

9
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.
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 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

10
To reduce the risk of injury,
user must read instruction
manual
Warning
Wear ear protection
Wear eye protection
Wear dust mask
Wear protective gloves
Batteries may enter water
cycle if disposed improperly,
which can be hazardous for
ecosystem. Do not dispose of
waste batteries as unsorted
municipal waste.
Do not burn
SYMBOLS
Do not dispose of batteries,
Return exhausted batteries to
your local collection or recycling
point.
xINR18/65-y
Cylindrical lithium Ion battery
cells with max diameter of
18mm and max height of
65mm; “x” represents a
number cells serial connected,
blank if 1; “-y” represents
a number of cells paralleled
connected, blank if 1.
High speed
Low speed
by POSITEC . 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.

11
OPERATING INSTRUCTIONS
Note: Before using the tool, read the
instruction book carefully.
INTENDED USE:
This tool is intended for the fastening and
loosening of bolts, nuts and various threaded
fasteners. This tool is not intended for use as a
drill.
ASSEMBLY AND OPERATION
Action Figure
Before operation
Checking the battery
charge condiction See Fig. A1
Removing The Battery
Pack See Fig. A2
Charging The Battery See Fig. A3
Installing The Battery
Pack See Fig. A4
Assembly
Inserting and Removing
Bits and Socket See Fig. B1, B2
Assembling the belt
hook and bit clip
See Fig. C1, C2,
C3, C4
Operaton
Switch Lock See Fig. D1
Forward And Reverse
Rotation Control
Warning: Never
Change The Direction
Of Rotation When The
Chuck Is Rotating,Wait
Until It Has Stopped!
See Fig. D2, D3
Variable Speed Control See Fig. E
Operating the On/Off
Switch
Warning: Do not
operate for long
periods at low speed
because excess heat
will be produced
internally.
See Fig. F
Using The Sight Light
Before operation, the
LED light will be activated
when the On/Off switch is
slightly depressed, and will
automatically turn off 20
seconds after the On/Off
switch is released.
The tool and battery are
equipped with a protection
system. When the LED Light
is quickly flashing 3 seconds
and turn off, the system will
automatically cut off power to
the tool to extend battery life.
The tool will automatically stop
during operation if the tool and/
or battery are placed under one
of the following conditions:
•Overloaded: The tool
is operated in a manner
that causes it to draw an
abnormally high current. In this
situation, release the Trigger
Switch on the tool and stop the
application that caused the tool
to become overloaded. Then
pull the Trigger Switch again to
restart.
• Overheated: Under the
condition above, if the tool
does not start, the Tool and
Battery are overheated. In
this situation, let the Tool and
Battery cool before pulling the
Trigger Switch again.
• Low battery voltage: The
remaining Battery capacity
is too low and the tool will
not operate. In this situation,
remove and recharge the
Battery.
Warning: To turn on the
light, press the On/Off switch
and make sure the Forward/
Reverse Rotation Control is on
right/left position.
See Fig. F

12
TROUBLE SHOOTING
1. I CAN NOT FITTHE BATTERY INTO THE
BATTERY CHARGER.WHY?
The battery can be inserted into the charger only
in one direction. Turn the battery around until it
can be inserted into the slot, the red LED Light
should turn on when the battery is charging.
2. REASONS FOR DIFFERENT BATTERY PACK
WORKINGTIMES
Charging time problems, as above, and having
not used a Battery Pack for a prolonged time will
reduce the Battery Pack working time. This can
be corrected after several charge and discharge
operations by charging & working with your drill.
Heavy working conditions such as large screws
into hard wood will use up the Battery Pack
energy faster than lighter working conditions. Do
not re-charge your Battery Pack below 0oC and
above 30oC as this will affect performance.
MAINTENANCE
Remove the battery pack from the machine
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.
We recommend that you purchase your
accessories listed in the above list from the same
store that sold you the tool. Use good quality
accessories marked with a well-known brand
name. Refer to the accessory packaging for
further details. Store personnel can assist you and
offer advice.
DISPOSAL OF AN
EXHAUSTED BATTERY
PACK
To preserve natural resources, please
recycle or dispose of the battery pack
properly. This battery pack contains
Lithium batteries. Consult your local waste
authority for information regarding available
recycling and/or disposal options. Discharge your
battery pack by operating your saw, then remove
the battery pack from the saw housing and cover
the battery pack connections with heavy duty
adhesive tape to prevent short circuit and energy
discharge. Do not attempt to open or remove any
of the components.
ENVIRONMENTAL
PROTECTION
Waste electrical products should not be
disposed of with household waste. Please
recycle where facilities exist. Check with
your Local Authority or retailer for recycling
advice.

13
DECLARATION OF
CONFORMITY
We,
Positec Power Tools (Europe) Ltd, PO Box 152,
Leeds, LS10 9DS, UK
Declare that the product,
Description WORX Cordless Impact Wrench
Type WU278.1 (278-designation of machinery,
representative of Impact Wrench )
WU292 WU292.1(292-designation of
machinery, representative of Impact Driver )
Function Tightening and loosening screws,
nuts
Complies with the following Directives,
2006/42/EC, 2004/108/EC, 2011/65/EU
Standards conform to
EN 55014-1,
EN 55014-2,
EN 60745-1,
EN 60745-2-2
The person authorized to compile the technical
file,
Name Russell Nicholson
Address Positec PowerTools (Europe)Ltd, PO
Box 152,Leeds,LS10 9DS,UK
Suzhou 2014/12/15
Allen Ding
Deputy Chief Engineer,Testing &
Certification

Copyright © 2015, Positec. All Rights Reserved.
2CSD26PPK11001A0
www.worx.com