model no. 058-9849-2 AIR-POWERED STUBBY IMPACT WRENCH IMPORTANT: For your own safety, read and follow all of the Safety Guidelines and Operating Instructions before operating this impact wrench. Keep this manual for future reference.
3 TABLE OF CONTENTS TECHNICAL SPECIFICATIONS SAFETY GUIDELINES KEY PARTS DIAGRAM TECHNICAL INFORMATION OPERATING INSTRUCTIONS MAINTENANCE TROUBLESHOOTING EXPLODED VIEW PARTS LIST WARRANTY NOTE: If any parts are missing or damaged, or if you have any questions, please call our toll-free helpline at 1-800-689-9928. SAVE THESE INSTRUCTIONS This manual contains important safety and operating instructions. Read all instructions and follow them with use of this product.
4 5 model no. 058-9849-2 | contact us 1-800-689-9928 SAFETY GUIDELINES TECHNICAL SPECIFICATIONS SQUARE DRIVE SPEED (NO LOAD) MAXIMUM TORQUE 1/2" (12.7 mm) 8500 RPM 450 ft-lb CF REQUIREMENT WORKING PRESSURE AIR INLET 3.5 CFM @ 90 PSI 90 PSI 1/4"-18 NPT AIR HOSE REQUIRED WEIGHT 3/8" (9.5 mm) 3 lb 3 oz (1.45 kg) CFM: Cubic Feet per Minute (the volumetric flow rate of air corrected to standardized conditions of temperature and pressure). NPT: National Pipe Thread.
7 model no. 058-9849-2 | contact us 1-800-689-9928 SAFETY GUIDELINES Risk of burns: The pump and the manifold generate high temperatures. In order to avoid burns or other injuries, do not touch the pump, the manifold, or the transfer tube while the compressor is running. Allow the parts to cool down before handling or servicing. Keep children and pets away from the compressor at all times. SAFETY GUIDELINES Do not use oxygen or any other combustible or bottled gas to power air-powered tools.
9 model no. 058-9849-2 | contact us 1-800-689-9928 CAUTION! CAUTION! Potential hazard that may result in injury or damage to equipment. • Keep proper footing at all times in order to ensure correct balance. • Do not use a tool that is leaking air, that has missing or damaged parts, or that requires repairs. Verify that all screws are securely tightened. • For optimal safety and tool performance, inspect the tool daily in order to ensure free movement of the trigger, safety mechanisms, and springs.
10 11 model no. 058-9849-2 | contact us 1-800-689-9928 No. Description No. Description 1 Square drive 4 Air deflector 2 Housing 5 Trigger 3 Air inlet plug 6 Power setting General use This Mastercraft® Air-powered Stubby Impact Wrench features jumbo-hammer mechanism for higher torque, an adjustable (3 position) torque regulator, and variable speed adjustment. The tool has a front exhaust.
12 13 model no. 058-9849-2 | contact us 1-800-689-9928 2 3 1 8 3 6 4 No. 7 5 No. Description Stubby Impact Wrench 6 Regulator 0 – 123 PSI (0 – 8.5 bar) 2 Quick connector 7 Filter 3 Quick coupler 8 Cut-off valve 4 Air hose 9 Air compressor 5 Lubricator 1 Description Mastercraft ® Air-powered 9 • It is recommended that an automatic in-line filter-regulator-lubricator be used and be located as close to the tool as possible.
14 15 model no. 058-9849-2 | contact us 1-800-689-9928 OPERATION 1. Plug in compressor, turn it on, set the pressure regulator to 90 PSI, attach one end of the air hose to the compressor and the other end of the air hose (1) to the tool (2) (Fig. A). 4. Press the trigger (1) of the tool for rotating operation (Fig. C). 2. Attach the socket (1) of required size to the drive head (2) of the tool (Fig. B). 5.
16 17 model no.
18 19 model no. 058-9849-2 | contact us 1-800-689-9928 Troubleshooting The following chart lists common issues and solutions. Please read it carefully and follow all instructions closely. PROBLEM POSSIBLE CAUSES SOLUTIONS Tool runs at normal speed but loses speed under load. 1. Motor parts are worn or damaged. 2. Rotor blade is worn or stuck due to lack of lubricant. 1. Repair or replace the parts. 2. Lubricate the parts.
21 model no. 058-9849-2 | contact us 1-800-689-9928 1 Bolt M5x16 8 19 Pin 3 x 10 1 2 Washer 5 8 20 Rear plate 1 3 Housing cover 1 21 Ball bearing R6 1 4 O-ring 7.5 x 1.
22 23 model no. 058-9849-2 | contact us 1-800-689-9928 3-Year Limited Warranty This product is guaranteed for a period of 3 years from the date of original retail purchase against defects in workmanship and materials, except for the following component: g) This warranty will not apply to any product or part thereof if any part from another manufacturer is installed therein or any repairs or alterations have been made or attempted by unauthorized persons.
