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OPERATOR'S MANUAL
4 in. (100 mm) Angle Grinder
Model AG400 / 

Double Insulated

SAVE THIS MANUAL FOR FUTURE REFERENCE

THANK YOU FOR BUYING A RYOBI ANGLE GRINDER.

Your new angle grinder has been engineered and manufactured to Ryobi's high standard for dependability, ease of operation,
and operator safety. Properly cared for, it will give you years of rugged, trouble-free performance.

           CAUTION: Carefully read through this entire operator's manual before using your new angle grinder.

Pay close attention to the Rules for Safe Operation, Warnings, and Cautions. If you use your grinder properly and only for
what it is intended, you will enjoy years of safe, reliable service.

Please fill out and return the Warranty Registration Card so that we can be of future service to you.

Thank you again for buying Ryobi tools.

SPECIFICATIONS:

Grinding Wheel Capacity

4 in. (100 mm)

Rating

120 volts, 60Hz, AC only

No Load Speed

11,000 RPM

Amperes

4.3 Amperes

Net Weight

 4.0 lbs. (1.8 kg.)

Summary of Contents for AG400

Page 1: ...CAUTION Carefully read through this entire operator s manual before using your new angle grinder Pay close attention to the Rules for Safe Operation Warnings and Cautions If you use your grinder properly and only for what it is intended you will enjoy years of safe reliable service Please fill out and return the Warranty Registration Card so that we can be of future service to you Thank you again ...

Page 2: ... OF CONTENTS AG400 ANGLE GRINDER TYPICAL APPLICATION WARNING Always use the guard that accompanied the grinder Comply with mounting and use instructions and warnings found in the manual for the grinder and ANSI B7 1 Failure to heed these warnings can result in wheel breakage and serious personal injury For more information on ANSI Standards contact the American National Standards Institute Inc 11 ...

Page 3: ... Ryobi power tool is double insulated This means you areseparatedfromthetool selectricalsystembytwocomplete sets of electrical insulation This extra layer of insulation is intended to protect the user from electrical shock due to a break in the wiring insulation All exposed metal parts are isolated from the internal metal motor components with protecting insulation Double insulated tools do not ne...

Page 4: ...k for misalignment or binding of moving parts breakage of parts and any other condi tion that may affect the tool s operation If dam aged have the tool serviced before using Many accidents are caused by poorly maintained tools WARNING Read and understand all instructions Failure to follow all instructions listed below may result in elec tric shock fire and or serious personal injury SAVE THESE INS...

Page 5: ...ommended If in doubt use the next heavier gage The smaller the gage number the heavier the cord An undersized cord will cause a drop in line voltage resulting in loss of power and overheating Use only accessories that are recommended by the manufacturer for your model Accessories that may be suitable for one tool may become hazardous when used on another tool Service Tool service must be performed...

Page 6: ...d cement and other masonry products and arsenic and chromium from chemically treated lumber Your risk from these exposures varies depending on how often you do this type of work To reduce your exposure to these chemicals work in a well ventilated area and work with approved safety equipment such as those dust masks that are specially designed to filter out microscopic particles SAVE THESE INSTRUCT...

Page 7: ... is 120 volts 60Hz AC only normal household current Do not operate this tool on direct current DC A substantial voltage drop will cause a loss of power and the motor will overheat If your tool does not operate when plugged into an outlet double check the power supply EXTENSION CORDS When using a power tool at a considerable distance from the power source use an extension cord heavy enough to carry...

Page 8: ...you careless Remember that a careless fraction of a second is sufficient to inflict severe injury SPINDLE LOCK BUTTON SWITCH BUTTON SIDE HANDLE GUARD GRINDING WHEEL FEATURES Side Handle The side handle provided stabilizes your grinder and must be used during all grinding operations In addition to maintaining safe control during use the side handle also provides convenient ease of operation for the...

Page 9: ...button and rotate clamp nut until spindle locks Loosen and remove clamp nut from spindle Do not remove disc flange Make sure flats on the bottom of disc flange are engaged with flats on spindle Place the grinding wheel over the spindle with the concave side of the wheel facing up WARNING Always install grinding wheel with the depressed center against the disc flange as shown in figure 3 Failure to...

Page 10: ...e sparks and loose particles thrown from the grinding wheel would be directed toward the operator Always place the guard in the correct location as shown in figures 4 and 5 WARNING Always wear safety glasses and keep guard in place when grinding Hot metal sparks from metal grinding can cause a fire Avoid spark contact with flammable materials such as saw dust or clothing Grinding wheels must be fr...

Page 11: ...ock on press in on the rear portion of the button Button will then disengage from the locked position GRINDING See Figure 8 Always carefully select and use grinding wheels that are recommended for the material to be ground Make sure that the minimum operating speed of the grinding wheel selected is not less than 11 000 rpm The grinding wheel provided with your grinder is suitable for grinding weld...

Page 12: ...er loosen the clamp screw until the guard can be adjusted or removed If you are making adjustments rotate the guard to its correct position as shown in figures 4 5 and 9 then retighten clamp screw securely Never use your grinder without the guard in place and properly adjusted See Figures 4 5 and 6 Note Be sure the tabs on the guard are seated in the groove in the bearing cap If you are replacing ...

Page 13: ...ove dirt carbon dust etc WARNING Do not at any time let brake fluids gasoline petroleum based products penetrating oils etc come in contact with plastic parts They contain chemicals that can damage weaken or destroy plastic WARNING Always wear safety goggles or safety glasses with side shields during power tool operation or when blowing dust If operation is dusty also wear a dust mask MAINTENANCE ...

Page 14: ... exposed wires and cut or worn insulation Ampere rating on tool data plate 0 2 0 2 1 3 4 3 5 5 0 5 1 7 0 7 1 12 0 12 1 16 0 Cord Length Wire Size A W G 25 16 16 16 16 14 14 50 16 16 16 14 14 12 100 16 16 14 12 10 CAUTION Keep the extension cord clear of the working area Position the cord so that it will not get caught on workpiece tools or other obstructions while you are working with a power tool...

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