Ryobi P1121 Operation Manual - Page 17

MAINTENANCE WARNING: Before performing any maintenance, make sure the mower batteries and start key are removed and the power supply is disconnected to avoid accidental starting and possible serious personal injury. WARNING: Always wear eye protection with side shields marked to comply with ANSI Z87.1. Failure to do so could result in objects being thrown into your eyes resulting in possible serious injury. WARNING: When servicing, use only authorized replacement parts. Use of any other parts can create a hazard or cause product damage. WARNING: Never use a hose, water, or any liquids to clean or rinse off the lawn mower. Corrosive liquids, water, fertilizers, and chemicals used to treat lawns can enter the lawn mower and/or battery compartment and damage electronic components and/or the battery pack, which can result in a short circuit, increased risk of fire, electric shock, and serious personal injury. Remove any buildup of grass and leaves on or around the mower housing and/ or underneath the mower deck. Wipe the mower clean with a dry cloth occasionally. NOTICE: Periodically inspect the entire product for damaged, missing, or loose parts such as screws, nuts, bolts, caps, etc. Tighten securely all fasteners and caps and do not operate this product until all missing or damaged parts are replaced. Please contact customer service or an authorized service center for assistance. GENERAL MAINTENANCE Avoid using solvents when cleaning plastic parts. Most plastics are susceptible to damage from various types of commercial solvents and may be damaged by their use. Use clean cloths to remove dirt, dust, oil, grease, etc. WARNING: Do not at any time let brake fluids, gasoline, petroleumbased products, penetrating oils, etc., come in contact with plastic parts. Chemicals can damage, weaken, or destroy plastic which can result in serious personal injury. Remove any build-up of grass and leaves on or around the motor cover. Wipe the mower clean with a dry cloth occasionally. Do not use water. LUBRICATION All of the bearings in this product are lubricated with a sufficient amount of high grade lubricant for the life of the unit under normal operating conditions. Therefore, no further bearing lubrication is required. WARNING: Always protect hands by wearing heavy gloves and/or wrapping the cutting edges of the blade with rags and other material when performing blade maintenance. Contact with the blade could result in serious personal injury. REPLACING THE CUTTING BLADE See Figures 14 - 15. NOTE: Only use authorized replacement blades.  Stop the motor and remove the start key. Allow blade to come to a complete stop.  Remove start key, battery packs and disconnect the power supply.  Turn the mower on its side.  Wedge a block of wood between the blade and mower deck to prevent the blade from turning.  Loosen the blade nut by turning it counterclockwise (as viewed from bottom of mower) using a 15 mm wrench or socket (not provided).  Remove the blade nut, spacer, blade insulator, and blade.  Place the new blade on the shaft against the fan assembly. Ensure blade is properly seated with shaft going through center blade hole and the two blade posts inserted into their respective holes on the blade. Make sure it is installed with the curved ends pointing up toward the mower deck and not down toward the ground. When seated properly, the blade should be flat against the fan assembly.  Replace the blade insulator and spacer, then thread the blade nut on the shaft and finger tighten. NOTE: Make certain all parts are replaced in the exact order in which they were removed.  Torque the blade nut down clockwise using a torque wrench (not provided) to ensure the bolt is properly tightened. The recommended torque for the blade nut is 350 - 400 in. lbs. 13 - English