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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" 

Summary of Contents for CT3991

Page 1: ...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 INSTRU...

Page 2: ...d 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...

Page 3: ...il 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 approve...

Page 4: ...ine 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 fo...

Page 5: ...r 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 wren...

Page 6: ...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...

Page 7: ...2 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 An...

Page 8: ...7 CANNON TOOLS LTD Add 20 station road Rowley Regis west midlands B65 0JU U K Made in China...

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