LAWN MOWER BLADE

AC04020/AC04021/AC04145

For use with RYOBI® 40 Volt

20 in. Lawn Mower ONLY

991000488

2-3-17 (REV:03)

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 - 2.



Stop the motor and remove the

fuse key. Allow blade to come to a

complete stop.



Remove the battery pack.



Turn the mower on its side.

 Wedge a block of wood between

the blade and mower deck to pre-

vent 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.

 Make certain the blade carrier is

pushed completely against the mo-

tor shaft.

Fig. 1



Place the new blade on the shaft

against the blade carrier. 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

blade carrier.



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 recom-

mended torque for the blade nut is

350-400 in. lbs.

A - Blade (lame, hoja)

B - Wrench (clé, llave)

C - Block of wood (pièce de bois, bloque de

madera)

A

B

C

Fig. 2

A - Blade carrier (support de la lame, soporte

de la hoja)

B - Shaft (arbre, eje)

C - Blade (lame, hoja)

D - Blade insulator (isolant de lame, aislante

de hoja)

E - Spacer (entretoise, separador)

F - Blade nut (écrou de lame, tuerca de la

hoja)

G - Blade posts (tiges pour lame, montantes

de cuchilla)

G

G

F

E

C

D

A

B

B

G

G

CALIFORNIA

PROPOSITION 65

WARNING:

This product and substances that

may become airborne from its use

may contain chemicals, including

lead, known to the State of Califor-

nia to cause cancer, birth defects,

or other reproductive harm.

Wash

hands after handling.

TECHTRONIC INDUSTRIES POWER EQUIPMENT

1428 Pearman Dairy Road

Anderson, SC 29625 USA

1-800-860-4050

www.ryobitools.com

NOTE: For purposes of the illustrations in this manual, only standard replacement blades are shown. However, bagging

blades would install in the same way.