YUEH CHI ENTERPRISE YU-RA4002 Operation instructions

.
Product Type 1/2” Air Angle Impact
Wrench
Model YU-RA4002
Putting Into Service
Air Supply
Use a clean lubricated air supply that will give
a measured air pressure at the tool of 90
p.s.i./ 6.3bar when the tool is running with
the trigger fully depressed And the air
regulator in its maximum opening flow
position. Use recommended hose size and
length. It is recommended that the tool is
connected to the air supply as shown in
figure1
All Pipe And Fitting
Should Be 1/2” Or Larger
Compressor
With Sufficient Capacity
To Maintain Recommended
Working Pressure At
Each Tool Outlet
Receiver Tank
40 Gallons Or More
Take Air From Top
Easy To Reach And
Operate Shut Off Valve
Air Regulator Set At
Recommended Working
Air Pressure
Drain Daily FilterLubricator
Air Tool
Low Spot To
Trap Water
Drain Daily
Recommended Air Supply System Figure 1
Work Stations
The tool should only be used as a handheld hand
operated tool. It is always recommended that the tool is
used when standing on the solid floor. It can be in other
positions but before any such use, the operator must be in
a secure position having a firm grip and footing and be
aware that when loosening fasteners the tool can move
quite quickly away from the fastener being undone. An
allowance must always be made for this rearward
movement so as to avoid the possibility of hand/arm/body
entrapment.
Foreseen Use Of Tool
The impact wrench is designed for the tightening and
loosening of threaded fasteners within the rang as
specified by manufacturer.It should only be used in
conjunction with suitable impact type 1/2" (13mm) square
female driver nut running sockets.Only use sockets
which are of the impact type.
It is allowed to use suitable extension bars, universal
joints and socket adaptors between the square output
driver of the impact wrench and the square female drive
of the socket.Do not use the tool for any other purpose
than that specified without consulting the manufacturer or
the manufacturer’ sauthorized supplier.To do so may be
dangerous.
Never use an impact wrench as hammer to dislodge or
straighten cross threaded fasteners.Never attempt to
modify the tool for other uses and never modify the tool
for even its recommended use as anut runner.
1.Do not connect aquick connect coupling directly to the
tool but use awhip or aleader hose of say approximately
12 inches (300mm) length.Do not connect the tool to the
airline system without incorporating an easy to reach and
operate air shut off valve.
The air supply should be lubricated.It is strongly
recommended that an air filter, regulator, lubricator (FRL)
is used as shown in Figure 1as this will supply clean,
lubricated air at the correct pressure to the tool.Details of
such equipment can be obtained from your supplier.If
such equipment is nit used then the tool should be
lubricated by shutting off the air supply to the tool,
depressurizing the line by pressing the trigger on the tool.
Disconnect the air line and pour into the intake bushing a
teaspoonful (5mL) of asuitable pneumatic motor
lubricating oil preferably incorporating arust inhibitor.
Reconnect tool to air supply and run tool slowly for afew
seconds to allow air to circulate the oil.If tool is used
frequently lubricate on daily basis and if tool starts to slow
or lose power.When lubricating, also ensure that screen
in intake bushing is clean.
It is recommended that the air pressure at the tool whilst
the tool is running at 90 psi./6.3 bar.The tool can run at
lower and higher pressure with the maximum permitted
working air pressure of 100 psi./ 7.0 bar.For alower air
pressure the tool will give alower output for agiven
setting of the sir regulator set for 90 psi./6.3bar.operation
and increased output for higher pressure.Hence it is
possible that changes in supply pressure can give
situation where the fastener is under over tightened.For
changes in pressure, the regulator position and
application should be reassessed.It is recommended that
joint tightness of the threaded fastener assembly be
checked with suitable measuring equipment.
Follow the national legislation of waste disposal.
“Original Instruction”
Operators Instructions
Includes-Foreseen Use, Work Stations, Putting Into Service,
Operating, Dismantling, Assembly and Safety Rules
Important
Read these instruction carefully before installing, operating,
servicing or repairing this tool. Keep these instructions in a
safe accessible place.

Safe Rules When Using an Impact
Wrench
Read all these safety instructions before operating
this product and save these instructions.
The tool has been manufactured in conformity with
the instruction of EU machine directive.The EU
mark will be considered void in the event of inexpert
repairs, the use of non-original parts and in case of
non-observance of the safety instructions in the
user’s manual.
General safety rules:
1. Watch the tool at all times when in use.
2. People under the influence of alcohol or drugs are
not allowed to use, repair or maintain the tools.
3. Keep unqualified persons, children, etc.Away from
the tool.
4. Keep work area clean and with sufficient daylight or
artificial lighting.The work area on which the
machine is used must be cleaned up.Disorder is
potential cause of accidents.
5. Danger of explosion.Never use oxygen and
combustible gas as an air supply for the tool which
many be ignited by spark and cause fire or explosion.
6. Never use gasoline or other flammable liquids to
clean the tool.
7. Do not use air tools in potentially explosive
atmospheres such as in the presence of flammable
liquids, cleaning solvents, fluid energy or stored
gases.
8. Do not expose air tools to rain.Do not use air tools
in damp or wet locations.
9. When afault or failure is detected, the tool must
immediately be disconnected from the air supply and
returned for repair.
10. It is not permitted to modify the tool in any way.
11. When not in use, keep tools in adry place, either
locked up or i a high place, out of the reach of
children.
12. Do not force small air tools to do the job of aheavy-
duty task.Do not use air tool for purpose of which
was not intended.
13. Wear suitable ear protection at environment noise
level>80db(A) and safety spectacles when using the
tool.Always wear approved safety goggles if work in
dusty.This also applies to other persons in the near
by vicinity.
Operating
The output of the impact wrench in prime working
condition is governed by mainly three factors
a) The input air pressure
b) The time the impact wrench is operated on joint.
Normal time for joints of average tension requirement 3to
5seconds.
c) The setting of air regulator for agiven joint at agiven
pressure operated for agiven time.
The air regulator can be used to the regulate the output of
the impact wrench if no other control means is available.
It is strongly recommended that an external pressure
regulator ideally as part of afitter/regulator/lubricator
(FRL) is used to control air inlet pressure so that the
pressure can be set to help control the tension required to
be applied to the threaded fastener joint.
There is no consistent reliable torque adjustment on an
impact wrench of this type.However, the air regulator can
be used to adjust torque to the approximate tightness of
known threaded joint.To set the tool to the desired
torque, select an nut or screw of known tightness of the
same size, thread pitch and thread condition as those on
the job.Turn air regulator to low position, apply wrench to
nut and gradually increase power (turn regulator to admit
more air) until nut moves slightly in the direction it was
originally set.The tool is now set to duplicate that
tightness, note regulator setting for future use.When
tightness nuts not requiring critical torque values, run nut
up flush and then tighten an additional one-quarter to one-
half turn(slight additional turning is necessary if gaskets
are being clamped).For additional power needed on
disassembly work, turn regulator to its fully open position.
This impact wrench is rated abolt size(please refer
technical specification of tool).Rating must be down
graded for spring Ubolts, tie bolts, long cap screws,
double depth nuts badly rusted conditions and spring
fasteners as they absorb much of the impact power.
When possible, clamp or wedge the bolt to prevent spring
back.
Soak rusted nuts in penetrating oil and break rust seal
before removing with impact wrench.If nut does not start
to move in three to five seconds use alarge size impact
wrench.Do not use impact wrench beyond rated capacity
as this will drastically reduce tool life.
Note:Actual torque on afastener is directly related to
joint hardness, tool speed, condition of socket and the
time the tool is allowed to impact.
Use the simplest possible tool=to-socket hook up.Every
connection absorbs energy and reduces power.

Safety precautions for projectile hazards
1. Failure of the workpiece, of accessories or even of
the inserted tool itself can generate high-velocity
projectiles.
2. Always wear impact-resistant eye protection during
the operation of the assembly power tool for
threaded fasteners. The grade of protection required
should be assessed for each use.
3. Ensure that the workpiece is securely fixed
Safety precautions for entanglement hazard
1. Entanglement hazards can result in choking,
scalping and/or lacerations if loose clothing,
personal jewellery, neckwear, hair or gloves are not
kept away from the tool and accessories.
2. Gloves can be become entangled with the rotating
drive, causing severed or broken fingers.
3. Rotating drive sockets and drive extensions can
easily entangle rubber-coated or metal-reinforced
gloves.
4. Do not wear loose-fitting gloves or gloves with cut or
frayed fingers.
5. Never hold the drive, socket or drive extension.
6. Keep hands sway from rotating drives.
Safety precautions for operating hazards
1. The use of the tool can expose the operator’s hands
to hazards including crushing, impacts, cuts and
abrasions and heat. Wear suitable gloves to protect
hands.
2. Operators and maintenance personnel shall be
physically able to handle the bulk, weight and power
of the tool.
3. Hold the tool correctly: be ready to counteract
normal or sudden movements and have both hands
available.
4. Maintain a balanced body position and secure
footing.
5. Release the start-and-stop device in the case of an
interruption of the energy supply.
6. Use only lubricants recommended by the
manufacturer.
7. Do not use in confined spaces and beware of
crushing hands between tool and workpiece,
especially when unscrewing.
14. Do not wear loose clothing or jewelry.They can be
caught in moving parts.Rubber gloves and non-skid
foot wear are recommended when working outdoors.
Wear protecti8ve hair covering to contain long hair.
15. Keep proper footing and balance at all times.
16. Use clamps or avice to hold work-piece.It is safer
than using your hand and free both hands to operate
the air tool.
17. When not use, before performing service or changing
accessories please disconnect tool from air
compressor.
18. Do not carry plugged in air tool with your finger on the
switch trigger.Be sure switch is in the “OFF” position
when connecting to air supply.
19. Watch what you are doing.Use common sense, even
unsafe situation or unbalanced positions, particularly
when you are tired.
20. Air powered tools can vibrate in use.Vibration,
repetitive motions or uncomfortable positions may be
harmful to your hands or arms.Stop using any tool if
discomfort, tingling feeling or pain occurs.Seek
medical advice before resuming use.
21. For multiple hazards, read and understand the safety
instructions before installing, operating, repairing,
maintaining, changing accessories on, or working
near the assembly power tool for threaded fasteners.
Failure to do so can result in serious bodily injury.
22. Only qualified and trained operators should install,
adjust or use the assembly power tool for threaded
fasteners.
23. Do not modify this assembly power tool for threaded
fasteners.Modifications can reduce the effectiveness
of safety measures and increase the risks to the
operator.
24. Do not discard the safety instructions;give them to
the operator.
25. Do not use the assembly power tool for threaded
fasteners if it has been damaged.
26. Tools shall be inspected periodically to verify that the
ratings and markings required by this part of EN ISO
11148 are legibly marked on the tool.The
employer/user shall contact the manufacturer to
obtain replacement marking labels when necessary.

Safety precautions for dust and fume
hazards
1. Dust and fumes generated when using assembly
power tools for threaded fasteners can cause ill
health ( for example, cancer, birth defects, asthma
and/or dermatitis); risk assessment and
implementation of appropriate controls for these
hazards are essential.
2. Risk assessment should include dust created by the
use of the tool and the potential for disturbing
existing dust.
3. Direct the exhaust so as to minimize disturbance of
dust in a dust-filled environment.
4. Where dust or fumes are created, the priority shall
be to control them at the point of emission.
5. All integral features or accessories for the collection,
extraction or suppression of airborne dust or fumes
should be correctly used and maintained in
accordance with the manufacturer’s instructions.
6. Use respiratory protection in accordance with
employer’s instructions and as required by
occupational health and safety regulations
Safety precautions for noise hazards
1. Unprotected exposure to high noise levels can
cause permanent, disabling hearing loss and other
problems, such as tinnitus (ringing, bussing,
whistling or humming in the ears).
2. Risk assessment and implementation of appropriate
controls for these hazards are essential.
3. Appropriate controls to reduce the risk may include
actions such as damping materials to prevent
workpieces from “ringing”.
4. Use hearing protection in accordance with
employer’s instructions and as required by
occupational health and safety regulations.
5. Operate and maintain the assembly power tool for
threaded fasteners as recommended in the
instruction handbook, to prevent an unnecessary
increase in noise levels.
6. If the assembly power tool for threaded fasteners
has a silencer, always ensure it is in place and in
good working order when the assembly power tool
for threaded fasteners is operating.
7. Select, maintain and replace the
consumable/inserted tool as recommended in the
instruction handbook, to prevent an unnecessary
increase in noise.
Safety precautions for repetitive motions
hazards
1. When using a power tool for, the operator can
experience discomfort in the hands, arms, shoulders,
neck, or other parts of the body.
2. While using an assembly power tool for threaded
fasteners, the operator should adopt a comfortable
posture whilst maintaining secure footing and
avoiding awkward or off-balanced postures. The
operator should change posture during extended
tasks, which can help avoid discomfort and fatigue.
3. If the operator experiences symptoms such as
persistent or recurring discomfort, pain, throbbing,
aching, tingling, numbness, burning sensations or
stiffness, these warning signs should not be ignored.
The operator should tell the employer and consult a
qualified health professional.
Safety precautions for accessory hazards
1. Disconnect the assembly power tool for threaded
fasteners from the energy supply before changing the
inserted tool or accessory.
2. Do not touch sockets or accessories during
impacting, as this increases the risk of cuts, burns or
vibration injuries.
3. Use only sizes and types of accessories and
consumables that are recommended by the assembly
power tool for threaded fasteners manufacturer.
4. Use only impact-wrench-rated sockets in good
condition, as poor condition or hand sockets and
accessories used with impact wrenches can shatter
and become a projectile.
Safety precautions for workplace hazards
1. Slips, trips and falls are major causes of workplace
injury. Be aware of slippery surfaces caused by the
use of the tool and also of trip hazards caused by the
air line or hydraulic hose.
2. Proceed with care in unfamiliar surroundings. Hidden
hazards, such as electricity or other utility lines, can
exist.
3. The assembly power tool for threaded fasteners is not
intended for use in potentially explosive atmospheres
and is not insulated against coming into contact with
electric power.
4. Make sure there are no electrical cables, gas pipes,
etc., that can cause a hazard if damaged by use of
the tool

7. Do not exceed the maximum air pressure stated on
the tool.
8. For torque-control and continuous-rotation tools, the
air pressure has a safety critical effect on
performance. Therefore, requirements for length
and diameter of the hose shall be specified.
9. Never carry an air tool by the hose.
Warning
1. The tool shall not be used in explosive atmospheres
unless specially designed for that purpose.
2. The tool is not electrically insulated. Do not use
where there is a possibility of coming into contact
with live electricity.
3. Unexpected tool movement due to reaction forces or
breakage of inserted tool or reaction bar may cause
injuries.
4. Preferably shut off the air supply before changing
socket or at least ensure that the hands are well
clear of the operating trigger.
5. Be aware of the risk of crushing by torque between a
reaction bar and the workplace.
6. When loosening fasteners first ensure that there is
sufficient clearance behind the tool to avoid hand
entrapment. The tool will move away from the
threaded joint as the nut/bolt etc. Is loosened and
rides up the thread moving the tool with it.
7. There is a risk of being injured specially when
unscrewing in confined work place if hands are not
kept away from the reaction bar. Keep hands sway
from the nut runner socket.
8. In case of nut runner socket failure, it may danger to
person from high speed splinters being emitted fro
impact wrench.
9. Be aware of the whipping compressed air hose.
10. Always ensure that the reverse valves is in the
correct position before operating the tool. Do not run
the tool unless the socket is first located on the joint.
11. Prevent the loose clothes, long hair, or any other
personal accessories from closing to the moving
part to reduce the risk of being caught trapped or
drawn in the rotating spindle.
Safety precautions for vibration hazards
1. Exposure to vibration can cause disabling damage to
the nerves and blood supply of the hands and arms.
2. Keep the hands away from the sockets.
3. Wear warm clothing when working in cold conditions
and keep your hands warm and dry.
4. If you experience numbness, tingling, pain or
whitening of the skin in your fingers or hands, stop
using the assembly power tool for threaded fasteners,
tell your employer and consult a physician.
5. Operate and maintain the assembly power tool for
threaded fasteners as recommended in the instruction
handbook, to prevent an unnecessary increase in
vibration levels.
6. Do not use worn or ill-fitting sockets or extensions, as
this is likely to cause a substantial increase in
vibration.
7. Select, maintain and replace the consumable/inserted
tool as recommended in the instruction handbook, to
prevent an unnecessary increase in vibration levels.
8. Sleeve fittings should be used where practicable.
9. Support the weight of the tool in a stand, tensioner or
balancer, if possible.
10. Hold the tool with a light but safe grip, taking account
of the required hand reaction forces, because the risk
from vibration is generally greater when the grip force
is higher.
Additional safety instructions for pneumatic
power tools
1. Always shut of air supply, drain hose of air pressure
and disconnect tool from air supply when not in use,
before changing accessories or when making repairs.
2. Never direct air at yourself or anyone else.
3. Whipping hoses can cause severe injury. Always
check for damaged or loose hoses and fittings.
4. Cold air shall be directed away from the hands.
5. Do not use quick-disconnect couplings at tool inlet for
impact and air-hydraulic impulse wrenches. Use
hardened steel (or material with comparable shock
resistance) threaded hose fittings.
6. Whenever universal twist couplings (claw couplings)
are used, lock pins shall be installed and whip check
safety cables shall be used to safeguard against
possible hose-to-tool and hose-and hose connection
failure.

3.34 inch (85mm)
2.55 inch(65mm)
10.9 inch (277mm)
Maintenance instruction:
1. Dry the filter and the air inlet of the tool.
2. Lubricate the quick connect coupling to prevent
blocking.
3. Air tool require lubrication throughout the life of
the tool. The air motor and bearing uses
compressed air to start the tool. The moisture in
compressed air will rust the air motor; you must
lubricate the motor daily.
4. Avoid storing the tool in a location subject to
high humidity. If the tool is left as it is used, the
residual moisture inside the tool can cause rust.
5. Before storage, lubricate tool and run it for a few
seconds.
6. Regular inspection of spindles, threads, and
clamping devices in respect of wear and tolerances
for location of abrasive products.
7. If the tool is too seriously damage to be used
anymore, recycle raw material instead of disposing
as waste. The machine, accessories and packaging
should be sorted for environmental-friendly
recycling. Check with your local authority or retailer
for recycling advice.
Read the operator’s instructions
before operating the tool.
Wear eye protection device. Wear ear protection device.
Technical Specification
Other Data
Air Inlet 1/4” (6.35mm)
Bolt Capacity 1/2 inch
13 mm
369 ft. lb
51 kg/m
500 Nm
Average Air Consumption
4 cfm
0.11 m3/min
Overall Length
Square Drive 1/2 inch
Clutch Twin Hammer
Type
Recommended Personal
Safety Equipment Use : Safety Glasses & Ear Protectors
Torque
Overall Width
Overall High
Product Type
1/2” Air Angle Impact Wrench
Serial No.
RPM (r/min)
8000 ±10%
Weight
Recommended Minimum
Hose Bore Diameter
Air Pressure
Maximum 6.3bar (90 psi)
Vibration
Level :
Noise Level
Sound Pressure Level dB(A)
Sound Power Level dB(A)
Recommended Maximum
Hose Length
Tested in accordance with
EN ISO 28927-2
YU-RA4002 1.3 kg 2.86 lbs
90.1
Measurement uncertainty K=3dB Measurement uncertainty
K=1.5 m/sec2
30 ft / 10 m
Load No Load
84.8
101.1. 95.8
3/8 in. / 10 mm
Tested in accordance with
EN ISO 15744
Model: YU-RA4002
4.894m/sec2

EC DECLARATION OF CONFORMITY
We: YUEH CHI ENTERPRISE CO., LTD.
No. 90, Jifeng Rd., Wufeng Dist., Taichung City, 41348 Taiwan
declare in sole responsibility that the equipment
Equipment: Air Impact Wrench
Model/ Serial No.:YU-x1 , SE-x2, PW-x3, SC-x4
x1: 1200P, 1202P, 1210PH, 1210P, 1240P, 1260P, 1270P, 1202T, 1260T, 1280T, 1281P, 1281T, 1282T, 1283T, 1285T,
1285TH, 2581T, 2583T6, 2587T, 2590T8, 2540PLR8, 2570T8, 2530R8, 2580PL, 2500T, 2520P, 2520P6, 0900P, 0902P,
0942P, 0904T, 0906T, 0907T, 0981T, 0982T, 0983T, 0984T, 0985T, 0987T, 1930T, 1932T, 1982T, 1985T, 1900P, 1920P,
1980P, 1981P, 1900R, 1980T, 0901RM, 0903RM, 0601R, 0985T-3/8“, 0986T, 0986J, 0986P, 0987P, 0988T, 0988J,
0988P, 2585T, 09851T, 09891T, 09891J, 12891T, 1217T, 19891T, 19892T6, 25891T, 25892T6, 25871T8,
19891T6, 25893T, 25893T6, 25893T8, 12898T, 12893T, 503H1, 503H2, RA4002
x2: 1281T, 1982T
x3: 1281T, 1982T, 1283T, 1283T‐A, 1284T, 1284T‐A, 1700T
x4: 1600P
to which this declaration applies, complies with these normative documents:
●Machinery Directive: 2006/42/EC
and conforms to the following EN standards,
●EN ISO 12100:2010
●EN ISO 11148-6:2012
Authorized representative established within the EU(if applicable):
Company Name:
Company Address:
Person responsible for compiling the technical file established within the EU:
Name, Surname:
Address:
Note: This declaration becomes invalid, if technical or operational modifications are
introduced without the manufacturers consent.
Name and Signature/Position Title Date and place
Taiwan, May. 20, 2020

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