Parts for 21AA45M5031 — MTD

We found 59 parts confirmed to fit the MTD 21AA45M5031.

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.

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 21AA45M5031: 78601760638 (MTD Bracket-rh H), 6490041B0638 (HANDLE ASM-U), 7860185A0637 (Bracket), 78601770691 (Bracket-lh H), 78601760691 (Bracket-rh H), 6490041B0691 (HANDLE ASM-U), 7860113A0638 (Shield), 7840208D0691 (Shift Cover), 6860044B0691 (Tiller Side Cover), 64900340691 (Tube Handle Assembly), 78601870637 (Shift Bracket), 7860090A0691 (Tiller Side Shield), 7860178A0691 (Tine Shield), 78601800637 (Shield Bracket), 95111583 (Kmart Lawn & Garden Equipment Engine Blower Housing), 95112535 (Lawn & Garden Equipment Engine Fuel Tank Cap), 751P10664A (MTD Lawn & Garden Equipment Throttle Linkage Spring), 7100376 (Ryobi Lawn Tractor Screw), 7100599 (MTD Lawn Tractor Screw).

Drive system (belts, pulleys, motors)

Symptom: A drum or tub that won't turn, a burning-rubber smell, or a loud thump or squeal during a cycle.

Check: With power off, turn the drum or tub by hand -- resistance or grinding points to the motor or a bearing, and a cracked, glazed, or snapped belt is visible once the cabinet is open.

Parts in this group on 21AA45M5031: 7840158B0638 (Belt Cover), 7840158B0709 (Belt Cover), 7840158B0691 (MTD Tiller Belt Guard), 7840158A0662 (Belt Cover), 78601930637 (Idler Keeper), 7561162 (Ryobi Tiller Input Pulley), 61104074A (Tiller Gear Case Wheel Shaft), 9540434 (Tiller Drive Belt).

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 21AA45M5031: 93404233 (Complete Wheel), 78601810638 (MTD Shift Rod), 93404231 (Tiller Wheel Assembly), 9170059B (Gear), 6170060 (Sprocket), 7381013 (Ryobi Lawn Tractor Mandrel Shaft), 751P10665A (Linkage), 78601810691 (Tiller Shaft Rod Lever), 7311595 (Ryobi Counter Weig), 7461117 (Tiller Clutch Cable), 9130484 (Tiller Tine Shaft Drive Chain), 9210378 (Tiller Tine Shaft Oil Seal), 95110799 (Kmart Cylinder Head), 6170061 (Ryobi Sprocket Assembly), 95110669 (MTD Lawn Tractor Oil Fill Plug), 9410563 (Snowblower Ball Bearing), 95110652 (MTD Snowblower Fuel Filter), 71204213 (Kmart Lawn & Garden Equipment Bolt), 63105020AP (MTD Lawn and Garden Equipment Engine Dipstick Assembly), 95110650 (MTD Lawn & Garden Equipment Fuel Line Kit), 9410600 (MTD Lawn Tractor Ball Bearing), 73107059 (MTD Lawn & Garden Equipment Engine Breather Hose), 95112785 (Carburetor Assembl), 7120421 (Tiller Wing Nut), 9360119 (MTD Lawn & Garden Equipment Lock Washer), 7123004A (Ace Lawn & Garden Equipment Flange Lock Nut), 71204063 (Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18), 71204065 (MTD Yard Machines Lawn Tractor Flange Nut).

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 21AA45M5031: 751P120058B (Carburetor Gasket), 751P11565B (Valve Cover Gasket), 751P11567B (MTD Lawn & Garden Equipment Engine Carburetor Gasket), 95111571 (MTD Lawn & Garden Equipment Engine Carburetor Gasket).

Before you buy

Match 21AA45M5031 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.