Ryobi P5452BTL Operation Manual - Page 23

MAINTENANCE  Properly tension the chain prior to sharpening. Refer to Adjusting the Chain Tension earlier in this manual. Do all of your filing at the mid-point of the bar.  Use a 5/32 in. diameter round file and holder.  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 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. Occasionally remove filings from the file with a wire brush. WARNING: Improper chain sharpening increases the potential of kickback, which can result in serious personal injury. WARNING: Failure to replace or repair damaged chain can cause serious injury. CORRECT TOP PLATE FILING ANGLE 30° INCORRECT TOP PLATE FILING ANGLE LESS THAN 30° MORE THAN 30° CORRECT SIDE PLATE FILING ANGLE 80° Fig. 27 INCORRECT SIDE PLATE FILING ANGLE HOOK BACKWARD SLOPE RAKER CLEARANCE .025 in. Fig. 28 NOTICE: A dull or improperly sharpened chain can cause excessive engine speed during cutting, which may result in severe engine damage. DEPTH GAUGE JOINTER Fig. 29 TOP PLATE FILING ANGLE See Figure 27.  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. FLAT FILE Fig. 30 SIDE PLATE ANGLE See Figure 28.  CORRECT - 80° Produced automatically if correct diameter file is used in file holder.  HOOK - "Grabs" and dulls quickly. Increases potential of KICKBACK. Results from using a file with diameter too small, or file held too low.  BACKWARD SLOPE - Needs too much feed pressure, causes excessive wear to bar and chain. Results from using a file with diameter too large, or file held too high. 23 - English