Neilsen CT3991 User manual

AIR IMPACT WRENCH
3/4" Square Drive
CT3991
ORIGINAL INSTRUCTIONS
Cannon Tools Limited
Address: 20 Station Road, Rowley Regis, West Midlands, B65 0JU.U.K.
SAVE THESE INSTRUCTIONS AND PRECAUTIONS.
READ ALL PRECAUTONS AND INSTRUCTIONS BEFORE USE.

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EC DECLARATION OF CONFORMITY
We CANNON TOOLS LTD
20 Station road, Rowley Regis, West Midlands,B65 0JU.U.K.
Declare that the following machine complies with the appropriate basic safety and
health requirements of the EC Directive based on its design and type, as brought
into circulation by us.
In case of alteration of the machine, not agreed upon by us, this declaration will
lose its validity.
Product description: 3/4" SQUARE DRIVE AIR IMPACT WRENCH
Model: CT3991
Applicable EC Directives:
EC Machinery Directive 2006/42/EC
Harmonized standards
EN ISO 12100, EN ISO 11148-6
20 Station Road, Rowley Regis, West Midlands, B65 0JU.U.K.
Mr. Gurcharan Tony Singh Sanghera
Managing Director
CANNON TOOLS LTD
2017-05-04

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1. SAFETY
WARNING! DO NOT use wrench if damaged or thought to be faulty.
WARNING! Disconnect from the air supply before changing accessories or servicing.
WARNING! Due to the possible presence of asbestos dust from brake linings, when working
around vehicle brake systems we recommend you wear suitable respiratory protection.
WARNING! Check correct air pressure is maintained and not exceeded. We recommend
90psi.
DO NOT use the wrench for a task it is not designed to perform.
DO NOT use worn, or damaged sockets
DO NOT use the wrench unless you have been instructed in its use by a qualified person.
DO NOT use the wrench for a task it is not designed to perform.
DO NOT carry the wrench by the air hose, or yank the hose from the air supply.
DO NOT operate the wrench if you are tired or under the influence of alcohol, drugs or
intoxicating medication.
DO NOT carry the wrench with your hand on the power trigger in order to avoid unintentional
starting.
DO NOT direct air from the air hose at yourself or others.
Maintain the wrench in good condition and replace any damaged or worn parts. Use genuine
parts only. Unauthorised parts may be dangerous and will invalidate the warranty. Keep air
hose away from heat, oil and sharp edges. Check air hose for wear before each use and
ensure that all connections are secure.
Only use impact sockets which are specifically designed for use with an impact wrench.
Wear approved safety eye/face shield, ear defenders and hand protection.
Follow all workshop safety rules, regulations, and conditions when using the wrench.
Maintain correct balance and footing. Ensure the floor is not slippery and wear non-slip
shoes.
Keep children and non essential persons away from the working area.
When not in use disconnect from air supply and store in a safe, dry, childproof location.
2. INTRODUCTION
Push button style forward/reverse switch enables one handed operation. Two stage trigger
design offers increased control with feather touch trigger for running up to 272Nm and fully
depressed for full torque. Features hammer cage support mechanism to reduce tool vibration
while in operation. Composite casing with soft grip makes the tool lighter, easier to handle and
helps to reduce vibration and chill. Handle exhaust with built-in silencer to help reduce noise
level and limits circulation of brake dust on wheel applications. Suitable for heavy-duty use in
the professional garage.
3. SPECIFICATION
Clutch Type : Twin Hammer Air Pressure : 90 psi
Max Torque : 1420 Nm Air Consumrtion (25%) : 9.5 SCFM
Max Torque : 1050 ft-lb Weight : 2.3 kg
Free Speed : 7000 rpm Length : 174 mm
Noise : 92.88/103.88 dBA Air Inlet : 1/4"

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4. PREPARATION
WARNING! Ensure the air supply is clean and does not exceed 90psi while operating the
wrench. Too high an air pressure and/or unclean air will shorten the product life due to
excessive wear, and may be dangerous causing damage and/or personal injury.
4.1. Air Supply
4.1.1. Ensure the wrench trigger is not depressed when connecting to the air supply.
4.1.2. You will require an air pressure of 90psi, and an air flow according to specification.
4.1.3. D rain your compressor air tank of water daily. Water in the air line will damage the
wrench.
4.1.4. Clean the compressor air inlet filter weekly. Recommended hook-up procedure is shown
in fig.1; see also note 4.2.
4.1.5. Line pressure should be increased to compensate for unusually long air hoses (over 8
metres). The minimum hose diameter should be1/4” I.D. and fittings must have the same
inside dimensions.
4.1.6. Keep hose away from heat, oil and sharp edges. Check hose for wear, and make certain
that all connections are secure.
4.2. Couplings
Vibration may cause failure if a quick change coupling is connected directly to the wrench.
To overcome this, connect a leader hose to the wrench. A quick change coupling may then
be used to connect the leader hose to the air line recoil hose. See fig.2 & fig.3.

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5. OPERATION
WARNING! Ensure you read, understand and
apply safety instructions before use.
5.1. Only use impact sockets which are specifically
designed for use with an impact wrench.
5.2. Connect the wrench to the air hose as in section 4.
5.3. Place the socket fully over the subject nut and
depress the trigger to operate the wrench.
5.4. To change the torque direction depress the button
in fig.1 and release. Depress and release again for
both directions. If the button remains outermost, then reverse direction; innermost then
forward direction. See also "F" and "R" symbols on the impact wrench handle.
5.5. A "soft start" torque of 272Nm is available by depressing the primary "feather touch" trigger
in fig.1.
5.6 Further depression of the secondary trigger in fig.1 provides the maximum torque available.
DO NOT use any additional force upon the wrench in order to remove a nut.
DO NOT allow the wrench to free run for an extended period of time as this will reduce
bearing life.
6. MAINTENANCE
WARNING! Disconnect the wrench from the air supply before changing accessories,
servicing or performing maintenance.
Replace or repair damaged parts. Use genuine parts only. Unauthorised parts may be
dangerous and will invalidate the warranty.
6.1. If the air system does not have an oiler, lubricate the air wrench daily with a few drops of
air tool oil dripped into the air inlet.
6.2. Clean the wrench after use with a mild detergent on a moist cloth.
6.3. For a full service contact your local service agent.
6.4. When not in use, disconnect from the air supply, store in a safe, dry, childproof location.

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7. TROUBLESHOOTING
7.1. Loss of power or erratic action may be due to the following:
a) Excessive drain on the air line. Moisture or restriction in the air pipe. Incorrect size or
type of hose connectors. To remedy check the air supply and follow instructions in
section 4.
b) Grit or gum deposits in the wrench may also reduce performance. This may be evident
in the air strainer, located in the area of the air inlet. Flush the wrench out with gum
solvent oil or an equal mixture of SAE No 10 oil and paraffin. Allow to dry before use.
8. ASSEMBLY DIAGRAM AND PARTS LIST

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Index
Description
Q'ty
Index
Description
Q'ty
▲1
Housing Ass'y
1
32
Air Regulator
1
2
Air Inlet Bushing
1
33
Throttle Valve
1
3
Exhaust Deflector
1
35
Pin
2
4
Seal
1
36
Pin
1
5
Screw
1
37
Spring
1
6
Rear End Plate
1
38
Spring
6
7
Spacer
1
39
Cap Screw
4
8
Rotor
1
40
Screw
3
★9
Rotor Blade
6
41
Screw
4
▲10
Cylinder
1
42
Screw
1
11
Gasket
1
43
Screw
6
12
Front End Plate
1
44
Screw
1
13
Hammer Cage
1
45
Washer
1
14
Hammer Dog
2
46
Washer
1
15
Hammer Pin
2
★47
Ball Bearing
1
16
Anvil(3/4")
1
★48
Ball Bearing
1
17
Socket Retainer
1
49
Retainer Ring
1
18
Anvil Bushing(3/4")
1
50
O-Ring
1
19
Front Cover Ass'y
1
51
O-Ring
2
▲20
Valve Bushing
1
52
O-Ring
2
21
Pin
1
53
O-Ring
1
22
Spring
1
54
Dust protection ring
1
23
Spring
1
56
Aluminum nameplates
1
24
Reverse Valve
1
60
Washer
2
25
Gasket
1
26
Valve closure
1
27
Trigger Ass'y
1
30
Trigger Pin
1
31
Spring
1
★are easily damaged parts；"▲"are semi assembled parts

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CANNON TOOLS LTD
Add: 20 station road, Rowley Regis, west midlands,B65 0JU.U.K.
Made in China