Ariens Pro 21 Owners Manual - Page 18

DO NOT Sharpen to This Pattern 1 2 Blade 3 Bolt DISCARD If More Than 1/2 in. (1.27 cm) 2 OA0013 Figure 13 4 3 Sharpen to This Pattern 1. Square Corner 2. Cutting Edge 3. Air Lift 4. Air Lift Erosion OT0792 Figure 12 3. Check mower blade balance. Slide mower blade on an unthreaded bolt. A balanced blade should remain in a horizontal position. If either end of mower blade moves downward, sharpen the heavy end until blade is balanced (Figure 13). 4. Install mower blade on unit. 5. Tighten the bolts to a torque of 37.5 50 lbf-ft (51 - 68 N•m). CHECK DRIVE BELT (SELFPROPELLED MODELS) Check drive belt and replace if worn or damaged. See DRIVE BELT REPLACEMENT on page 20. CHECK FASTENERS Check all fasteners for proper tightness. Pay special attention to blade hardware and all guards, shields and safety devices. CHECK AIR CLEANER See engine manual for specific information. CHANGE ENGINE OIL IMPORTANT: Change engine crankcase oil after first five (5) hours of operation. Then change oil after every 25 hours of operation. Refer to engine manual for instructions and proper oil type. IMPORTANT: Proper oil level must be maintained at all times or engine damage will result. DO NOT overfill. Be sure engine is level when adding oil. GB - 18