This .pdf document is bookmarked Operating Instructions and Parts Manual 8-inch Bench Grinder Model JWBG-8 Model 726100 shown For models with serial no. 15100001 and higher. JET 427 New Sanford Road LaVergne, Tennessee 37086 Ph.: 800-274-6848 www.jettools.com Part No.
1.0 Warranty and Service JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please contact Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday. Warranty Period The general warranty lasts for the time period specified in the literature included with your product or on the official JET branded website. • JET products carry a limited warranty which varies in duration based upon the product.
2.0 Table of contents Section Page 1.0 Warranty and Service ..................................................................................................................................... 2 2.0 Table of contents............................................................................................................................................ 3 3.0 Safety warnings...................................................................................................................................
11. Make certain the switch is in the OFF position before connecting the machine to the power supply. 12. Make certain grounded. 3.0 Safety warnings 1. Read and understand the entire owner's manual before attempting assembly or operation. 2. Read and understand the warnings posted on the machine and in this manual. Failure to comply with all of these warnings may cause serious injury. 3. Replace warning labels obscured or removed. 4. Do not use this grinder for other than its intended use.
27. Remove loose items and unnecessary work pieces from the area before starting the grinder. 31. Allow abrasive wheels to reach full RPM before starting the grinding operation. 32. Do not crowd the work so that the wheels slow. 28. Don’t use in dangerous environment. Don’t use power tools in damp or wet location, or expose them to rain. Keep work area well lighted. 33. Tool rest should be adjusted less than 1/8” from wheel surface. 34.
5.0 Specifications Model number ............................................................................................. ............................................... JWBG-8 Stock numbers: Bench Grinder with two Norton grinding wheels ....................................... ................................................. 726100 Bench Grinder only (no grinding wheels) ................................................. .................................................
6.0 Setup and assembly 6.1 Shipping contents Carton contents (see Figure 1) Qty.
6.4 Mounting the grinder The grinder is provided with rubber pads to help prevent movement on a bench. For best results, however, it is recommended the grinder be bolted to the work surface or a grinder stand (fasteners not included). 1. Align mounting holes on grinder with predrilled holes in a bench or grinder stand. Refer to Figure 2 for hole spacing. 2. Insert bolts through the holes, and tighten using washers and nuts. Figure 3: brackets to spark guards 6.
The tool rests must not contact the grinding wheel, but should ideally be adjusted to within 1/16” of the wheel, depending upon the type of tool being ground. As a wheel wears down, the tool rest should be readjusted to maintain this clearance. 1. Suspend wheel from the hole by a small pin or finger. 2. Gently tap the flat side of the wheel with a nonmetallic object, such as a wood dowel or the handle of a screwdriver.
6.13 Wheel balancing and repeat the above steps for the outer flange. With the grinder unplugged from the power source, and arbor nuts snugged down, rotate wheels by hand and observe their motion. 4. If required, a shim made of thick paper or card stock may be placed between flange and wheel side. A grinding wheel has proper balance when: 1. 2. Continue this combination of flange movements until the wobble is eliminated.
7.1 Grounding instructions product will draw. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. Table 1 shows correct size to use depending on cord length and nameplate ampere rating. If in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord. 1.
8.3 Tool rest adjustment paths, and turn on the grinder. Allow it to reach full running speed before beginning operation. As the wheel wears down, the tool rest must be readjusted to maintain a 1/16" to 1/8” distance. 1. Loosen two hex cap screws (H, Figure 8) with a 12mm wrench. 2. Slide tool rest bracket (Q) as needed. 3. Tighten screws (H). Keep a steady, moderate pressure on the workpiece and keep it moving at an even pace for smooth grinding.
Test new wheels for cracks and maintain the existing sequence of retaining hardware. Be sure the grinder is unplugged before attempting repairs. Check grinding wheels for cracks and chips. Replace if damaged. To change a wheel (refer to Figure 5): 1. Disconnect grinder from power source. 2. Move spark guard and tool rest away from the wheel.
12.0 Troubleshooting the JWBG-8 Table 3 Problem Motor will not start. Motor will not start and fuse blows or circuit breaker trips. Motor fails to develop full power. Motor overheats. Motor stalls or slows. Frequent fuse or circuit breaker failure. Grinding wheels won’t spin true. Excessive vibration. Probable Cause Remedy Not plugged into receptacle. Plug must be fully inserted into receptacle. Switch not in ON position. Make sure switch is moved completely to ON position.
13.0 Replacement Parts Replacement parts are listed on the following pages. To order parts or reach our service department, call 1800-274-6848 Monday through Friday (see our website for business hours, www.jettools.com). Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.
13.1.
13.1.2 JWBG-8 Bench Grinder – Parts List Index No Part No Description Size Qty 1A .............. JWBG8-01A .............. Rotor Assembly ....................................................... ...................................... 1 1 ................ JWBG8-01................. Arbor (RE: JWBG8-01A) ........................................... ...................................... 1 2 ................ JWBG8-02................. Rotor (RE: JWBG8-01A) ........................................... ...........
Index No Part No Description Size Qty 55 .............. JBG8A-54.................. Cross Head Screw ................................................... 1/4 x 1/2 ........................ 2 56 .............. 6295480 .................... Hex Head Screw ...................................................... 1/4 x 3/8 ........................ 4 57 .............. JBG8A-55.................. Eye Shield Bracket – left.......................................... ...................................... 1 58 ........
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427 New Sanford Road LaVergne, Tennessee 37086 Phone: 800-274-6848 www.jettools.
