Parts for 21A121R700 — Yard Machines

We found 28 parts confirmed to fit the Yard Machines 21A121R700.

Compatibility table

Prices shown are an informational reference range only, not an offer or an Amazon price — RepairKitHub does not sell parts directly. Each part links to an Amazon search so you can compare current listings yourself.

Common failure areas on this model

The confirmed parts above group into a handful of failure areas. Here is what each points to and how to check it before you order anything.

General hardware and mounting parts

Symptom: A small mechanical or mounting part has failed, cracked, or gone missing.

Check: Compare the physical shape and mounting points to the original piece, and confirm the exact part number against your model plate before ordering.

Parts in this group on 21A-121R700: 75304489 (Gearbox), RB29 (Carburetor Repair Kit), 872 (Rod), 791182174 (Yard Machines Muffler), 75304333 (Lawn & Garden Equipment Engine Carburetor), 791610311B (Lawn & Garden Equipment Engine Spark Plug), 791683065 (Shroud), 791180090 (Yard Machines Lawn & Garden Equipment Carburetor Rebuild Kit), 791682039 (Fuel Line), 7531209 (Yard-Man Lawn & Garden Equipment Engine Piston Ring Set), 791613103 (Yard Machines Lawn & Garden Equipment Engine Recoil Starter Rope), 791180288 (Sleeve Bolt), 791182723 (Yard-Man Lawn & Garden Equipment Bolt), 75305860 (Yard-Man Lawn & Garden Equipment Clutch Assembly), 791180350B (Yard Machines Lawn & Garden Equipment Engine Air Filter).

Storage, trim and cosmetic hardware

Symptom: A cracked shelf, broken door bin, worn hinge, or missing trim piece -- cosmetic and storage wear rather than a functional breakdown.

Check: Match the physical dimensions and mounting tabs of the old part before ordering; these pieces are often model-specific even between visually similar models.

Parts in this group on 21A-121R700: 791684451 (Line Trimmer Reed Valve Assembly), 791613102 (Yard-Man Lawn & Garden Equipment Engine Recoil Starter Spring), 791182612 (Ryobi Lawn & Garden Equipment Engine Fuel Tank Cap), 791181811 (Troybilt Lawn & Garden Equipment Screw), 791181599 (Yard-Man Tiller Clutch Spring), 791181086 (MTD Yard Machines Line Trimmer Fuel Line), 791182405 (Trimmer Switch), 791153592 (Yard Machines Line Trimmer Clutch Drum), 791181345 (Tiller Clutch Cover Screw).

Door and drum seals

Symptom: A door or drum seal that has lost its grip, letting water or conditioned air escape past it.

Check: Inspect the seal for tears, flattening, or gaps, and check it against your model's part number before ordering.

Parts in this group on 21A-121R700: 75304619 (Troybilt Lawn & Garden Equipment Engine Exhaust Gasket), 7531208 (Yard Machines Lawn & Garden Equipment Engine Carburetor Mount Gasket), 791610675 (Gasket).

Interior lighting

Symptom: The interior light doesn't turn on when the door opens.

Check: Confirm power is reaching the socket, then check the door-activated light switch before assuming the bulb itself is at fault.

Parts in this group on 21A-121R700: 791683974B (MTD Yard Machines Line Trimmer Primer Bulb and Hose Assembly).

Before you buy

Match 21A121R700 exactly against the model and serial plate on the appliance itself before ordering anything — a single mismatched character can point to a different production run with different parts. Then check the part number printed or stamped on the part you are replacing against the part numbers in the table above; the printed number is the most reliable way to confirm fitment when a model has gone through multiple production runs. RepairKitHub does not sell parts directly — every part link above routes to an Amazon search for that part number so you can compare current listings and sellers yourself.

How to confirm this is your model

Check inside a door opening, on a back or side panel, or behind a removable panel or drawer for a label printed with the model and serial number. Match every character exactly, including letters and dashes at the end — appliance model numbers often have similar prefixes but different suffixes for different production runs.

Still not sure?

Use the model lookup tool to search by model or part number, or start from the symptom your appliance is showing.