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Slide cover and plastic tube back. Figure 4-1b (4) 20 Hours (3) Before Each Use Figure 4-1d (5) 20 Hours - Gear Bar Lube 13 4-3 BLADE REPLACEMENT The disc mower blades each have two cutting edges. When one edge becomes dull or damaged, remove the bolt and turn the blade over, Nuts can be re-used if not damaged. If both cutting edges of the blade have been used, the blades must be replaced. Always replace both blades on a spindle to retain balance. When replacing blades, the attaching bolt and nu