Ryobi AC04029 Lawn Mower Blade Replacement
For use with RYOBI RY401017 and RY401018 20 in. 40V Lawn Mowers ONLY
Safety Warnings
⚠️ WARNING!
To reduce the risk of injury, user must read and understand the operator's manual for their lawn mower and this instruction sheet. Always wear eye protection with side shields marked to comply with ANSI Z87.1. Ensure compatibility and fit before using this accessory. Do not use this accessory if a part is damaged or missing. If you are not comfortable performing any of the functions described in these instructions, take your unit to a qualified service center.
⚠️ 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 1 and 2 for visual reference.
[Note]: Only use authorized replacement blades.
- Stop the motor and remove the start key. Allow the blade to come to a complete stop.
- Remove the battery pack from the battery port.
- 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 the bottom of the 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 blade posts. Ensure the blade is properly seated with the shaft going through the 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.
- 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 310-360 in.lbs.
⚠️ WARNING:
Ensure the blade is properly seated and the blade nut is tightened to the torque specifications above. Failure to properly attach the blade could cause it to come loose and result in possible serious personal injury.
Diagram Descriptions
Figure 1: Mower Deck View
This figure shows a side view of the lawn mower deck. Key components are labeled:
- A - Blade: The cutting blade itself.
- B - Wrench: A tool used to loosen or tighten the blade nut.
- C - Block of wood: Used to secure the blade and prevent it from turning during maintenance.
Figure 2: Blade Assembly Components
This figure illustrates the individual parts that make up the blade assembly. Key components are labeled:
- A - Adaptor: An adapter piece, possibly for the hub.
- B - Hub: The central part that connects to the mower shaft.
- C - Blade post (half circle): A semi-circular post on the hub that aligns with a corresponding hole on the blade.
- D - Blade post (square): A square post on the hub that aligns with a corresponding hole on the blade.
- E - Blade: The cutting blade.
- F - Blade hole (half circle): A semi-circular opening on the blade that fits over the half-circle blade post.
- G - Blade hole (square): A square opening on the blade that fits over the square blade post.
- H - Blade insulator: A component placed between the blade and the nut/spacer, potentially for vibration dampening or alignment.
- I - Spacer: A component used in the assembly, likely for spacing parts correctly.
- J - Blade nut: The fastener used to secure the blade assembly to the hub.
- K - Shaft: The rotating shaft from the mower motor to which the blade assembly is attached.
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