Ryobi RY40530 Operation Manual 2 - Page 27

MAINTENANCE TOP PLATE FILING ANGLE See Figure 38.  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 39.  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. DEPTH GAUGE CLEARANCE See Figures 40 - 41.  The depth gauge should be maintained 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. Depth gauge jointers are available in .020 in. to .035 in. 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. CORRECT TOP PLATE FILING ANGLE 30° INCORRECT TOP PLATE FILING ANGLE LESS THAN 30° MORE THAN 30° CORRECT SIDE PLATE FILING ANGLE 80° Fig. 38 INCORRECT SIDE PLATE FILING ANGLE HOOK BACKWARD SLOPE DEPTH GAUGE JOINTER Fig. 39 FLAT FILE Fig. 40 RESTORE ORIGINAL SHAPE BY ROUNDING THE FRONT Fig. 41 27 - English