10421 (3900001-3999999 - 1993) Lawn Boy Lawn Mower - Overview

PANEL

Door

Filter- A/C Cartridge

★★★★★

★★★★★

(4)

This is a replacement air filter/AC cartridge for your small engine. The air filter prevents dirt and debris from entering the engine. Over time, the air filter can become clogged or damaged, and this... Add to cart

Washer-Stepped

★★★★★

★★★★★

(1)

The Stepped Washer is used to secure the wheels onto the shaft of a push mower. It attaches to the wheel axle. If broken due to wear/fatigue, the wheel will come off and the part should be replaced. I... Add to cart

Key-Flywheel

★★★★★

★★★★★

(1)

Add to cart

Ring-Clip, Locking

★★★★★

★★★★★

(1)

This OEM Locking Ring holds components or assemblies onto a shaft or in a housing/bore when installed in a groove. Installation is rated as "Easy" by customers and will require pliers. The part secure... Add to cart

Bolt-Shoulder The Shoulder Bolt is a 3/8-16 x 3-5/8 bolt, certified by the original equipment manufacturer. It is a metal bolt which is individually sold and comes in black. Installation requires a wrench or socket... Add to cart

Nut-Lock, Ni The Ni Lock Nut (Nylock Nut) is a Silver, 5/16x18, individually sold metal nut. It can be adjusted and replaced using a wrench or socket and torque wrench to the manufacturer specfications, and is use... Add to cart

Nut-Lock, Ni Add to cart

Washer This OEM-sourced washer in your walk-behind lawnmower provides space and protects the rear wheel from rubbing against the pivot arm assembly, ensuring smooth wheel rotation. A damaged washer may appea... Add to cart

Bearing-Ball This metal ball bearing reduces friction and evenly distributes weight among the rotating parts in your lawn equipment. These bearings can be found in various areas such as the wheels, in pulleys, bla... Add to cart

Screw-Hh Add to cart

Washer-Thrust, Keyed Add to cart

Gear-Pinion Add to cart