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.025 in. inspect drive sprocket MAINTENANCE MAINTENANCE SHARPENING THE CUTTERS See Figures 49 - 52. Be careful to file all cutters to the specified angles and to the same length, as fast cutting can only be obtained when all cutters are uniform. WARNING: The saw chain is very sharp. Always wear protective gloves when performing maintenance to the chain to prevent serious personal injury. . Tension the chain prior to sharpening. Refer to Adjusting The Chain Tension. . Use a 5/32 in. diameter round file and holder. Do all of your filing at the midpoint of the bar. . Keep the file level with the top plate of the tooth. Do not let the file dip or rock. . Using light but firm pressure. Stroke towards the front corner of the tooth. . Lift the file away from the steel on each return stroke. . Put a few firm strokes on every tooth. File all left hand cutters in one direction. Then move to the other side and file the right hand cutters in the opposite direction. . Remove filings from the file with a wire brush. CAUTION: A dull or improperly sharpened chain can cause excessive engine speed during cutting, which may result in severe engine damage. WARNING: Improper chain sharpening increases the potential of kickback. WARNING: Failure to replace or repair a damaged chain can cause serious injury. Cutting Corner Side plate depth gauge toe gullet heel rivet hole top plate Fig. 49 Fig. 50 Fig. 51 leFt hand CutterS right hand CutterS Fig. 52 Page 30 — English MAINTENANCE MAINTENANCE TOP PLATE FILING ANGLE See Figure 53. . CORRECT 30° – file holders are marked with guide marks to align file properly to produce correct top plate angle. . LESS THAN 30° – for cross cutting. . MORE THAN 30° – feathered edge dulls quickly. SIDE PLATE ANGLE See Figure 54. . CORRECT 80° – Produced automatically if you use the correct diameter file in the file holder. . HOOK – “Grabs” and dulls quickly; increases the potential of KICKBACK. Results from using a file with a diameter too small or a file held too low. . BACKWARD SLOPE – Needs too much feed inCorreCt more than 30° top plate Filing angle leSS than 30° Fig. 53 30° CorreCt inCorreCt BaCkward Slope Side plate Filing angle Fig. 54 80° CorreCt hook pressure; causes excessive wear to the bar and chain. Results from using a file with a diameter too large or file held too high. MAINTAINING DEPTH GAUGE CLEARANCE See Figure 55 - 57. . Maintain the depth gauge at a clearance of .025 in. Use a depth gauge tool for checking the depth gauge clearances. . Every time the chain is filed, check the depth gauge clearance. .Use a flat file and a depth gauge jointer to lower all gauges uniformly. Use a .025 in. depth gauge jointer. After lowering each depth gauge, restore original shape by rounding the front. Be careful not to damage adjoining drive links with the edge of the file. .Depth gauges must be adjusted with the flat file in the same direction the adjoining cutter was filed with the round file. Use care not to contact cutter face with flat file when adjusting depth gauges. Flat File depth gauge jointer Fig. 56 reStore original Shape By rounding the Front Fig. 57 Fig. 55 raker (depth gauge) ClearanCe .025 in. Page 31 — English MAINTENANCE MAINTENANCE MAINTAINING THE GUIDE BAR See Figure 58. CAUTION: Make sure the chain has stopped before you do any work on the saw. Every week of use, reverse the guide bar on the saw to distribute the wear for maximum bar life. The bar should be cleaned every day of use and checked for wear and damage. Feathering or burring of the bar rails is a normal process of bar wear. Such faults should be smoothed with a file as soon as they occur. A bar with any of the following faults should be replaced: . Wear inside the bar rails that permits the chain to lay over sideways . Bent guide bar . Cracked or broken rails . Spread rails Lubricate guide bars with a sprocket at their tip weekly. Using a grease syringe, lubricate weekly in the lubricating hole. Turn the guide bar and check that the lubrication holes and chain groove are free from impurities. MOUNTING THE SAFE-T-TIP® NOSE GUARD See Figures 59 - 60. . Stop the engine and disconnect the spark plug wire. . Mount the SAFE-T-TIP® on the bar nose. . Fit the locking tab in the recessed slot in the guide bar. . Tighten the mounting screw with wrench until snug. . From the snug position, tighten the mounting screw an additional 3/4 of a turn using a wrench. Fig. 58 luBriCating hole mounting SCrew SaFe-t-tip® Fig. 59 tighten 3/4 oF a turn Fig. 60 MAINTAINING THE SAFE-T-TIP® NOSE GUARD See Figures 59 - 60. CAUTION: Make sure the chain has stopped before you do any work on the saw. WARNING: Although the guide bar comes with a SAFET- TIP® antikickback device already installed, check the tightness of the mounting screw before each use. Page 32 — English Page 33 — English STOP STOP maintenance Use the following instructions to tighten the mounting screw of the nose guard. These are specially hardened screws. If you cannot install th...

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