Harbor Freight Tools 35570 User Manual - Page 7

MAINTENANCE Bit and Chisel Sharpening: If the bit is dull, it can break the chisel, resulting in operator injury. It is sharpenable, however, if there is any sign of wear along the twist (such as irregular grooves or hollows) the bit must be replaced. Chisels cannot be sharpened if the walls become noticeably thin Typically, you will replace a bit three times as often as a chisel. Replacement bits and chisels are available from Harbor Freight Tools. 1. To sharpen the bit, use a three cornered file and sharpen the inner edge of the spur and the cutting edge of the twist. 2. To sharpen the chisel, first fix it in a vise. Use a tapered stone or rotary, file in a drill. Set the RPM's very low or the temper of the chisel will be affected. Use a file to remove any burrs on the outside face of the chisel. Lubrication: 1. Before every use, lubricate the both columns with a light machine oil. Clean them after every use to prevent accumulation of foreign matter. 2. After every 30 days of use, grease the gears inside the head. They are accessible through the panel on the underside of the head. Page 7 SKU 35570