Parts for 21A634A766 — MTD
We found 45 parts confirmed to fit the MTD 21A634A766.
Compatibility table
| Part # | Part | Also fits | Reference price |
|---|---|---|---|
| 75305332 | Kit-tilr Tra | 5 models | $1219.66 · Amazon |
| 95604183 | Engine Pulley | 7 models | $100.30 · Amazon |
| 749042080638 | Handle | 8 models | $71.58 · Amazon |
| 65604023A | Pulley Assembly | 9 models | $107.69 · Amazon |
| 73105268 | Belt Cover | 10 models | $105.34 · Amazon |
| 749041930637 | Bumper | 10 models | $77.58 · Amazon |
| 786042910638 | Hood Bracket | 10 models | $21.67 · Amazon |
| 68604077B | SHIELD ASM-T | 10 models | $238.25 · Amazon |
| 68604076A0638 | Shld Asm | 10 models | $114.88 · Amazon |
| 65604005A | Tiller Transmission Pulley | 10 models | $75.03 · Amazon |
| GW9301099 | Tiller Woodruff Key | 10 models | $5.91 · Amazon |
| 91104110 | Troy-Bilt Shaft-Drive | 10 models | $250.56 · Amazon |
| 786042900638 | Hood Bracket | 11 models | $20.77 · Amazon |
| 73604257 | Lawn & Garden Equipment Washer | 11 models | $7.29 · Amazon |
| 71004163 | Tiller Screw | 11 models | $5.31 · Amazon |
| GW1901 | Tiller Tine Assembly | 11 models | $282.82 · Amazon |
| 75305578 | Tiller Wheel Axle Service Kit | 11 models | $548.17 · Amazon |
| 91904013 | Transmission Housing | 11 models | $233.65 · Amazon |
| 786042750637 | Troy-Bilt Arm:Idler:Fo | 11 models | $64.62 · Amazon |
| 73604192 | Troy-Bilt Washer:Flat | 11 models | $15.63 · Amazon |
| 7500258 | Ryobi Lawn & Garden Equipment Spacer | 12 models | $53.01 · Amazon |
| 742042270637 | Tiller Bolo Tine, Left | 13 models | $19.42 · Amazon |
| GW55044 | Troy-Bilt Tab, Conduit Mount | 13 models | $28.44 · Amazon |
| 94604208 | Lawn Mower Drive Control Cable | 14 models | $72.78 · Amazon |
| 73204185 | Tiller Forward Clutch Spring | 14 models | $8.80 · Amazon |
| 94604058 | Tiller Reverse Cable | 14 models | $66.10 · Amazon |
| 68604077B0638 | Shield | 15 models | $224.56 · Amazon |
| 91704383 | Troy-Bilt Gear-Worm 30 | 15 models | $159.97 · Amazon |
| 91704380 | Tiller Tine Input Sprocket Assembly | 16 models | $153.54 · Amazon |
| GW9301 | Troy-Bilt Key, 3/16 Sq. X 1 | 17 models | $10.00 · Amazon |
| 92104229 | Tiller Gear Case Cover Gasket | 19 models | $15.91 · Amazon |
| 1916658 | Reverse Belt | 32 models | — · Amazon |
| 1916657 | Belt | 33 models | — · Amazon |
| 71404048 | Pin:cot:int | 39 models | $12.61 · Amazon |
| 92104031 | Tiller Wheel Shaft Oil Seal | 43 models | $17.17 · Amazon |
| 95404091 | Belt-v Rev Drv 3 | 48 models | $27.09 · Amazon |
| 95404090 | Tiller Forward Drive Belt | 49 models | $28.56 · Amazon |
| 7260201 | Lawn Tractor Push Cap | 56 models | $12.53 · Amazon |
| 7250157 | Lawn & Garden Equipment Cable Tie | 85 models | $25.35 · Amazon |
| 7100376 | Ryobi Lawn Tractor Screw | 139 models | $6.05 · Amazon |
| 7100514 | Yard Machines Lawn Tractor Bolt | 157 models | $6.30 · Amazon |
| 7360119 | Lock Washer | 529 models | $2.16 · Amazon |
| 71204063 | Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18 | 1,010 models | $5.45 · Amazon |
| 71204065 | MTD Yard Machines Lawn Tractor Flange Nut | 1,047 models | $6.24 · Amazon |
| 7100599 | MTD Lawn Tractor Screw | 1,116 models | $5.81 · Amazon |
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-634A766: 75305332 (Kit-tilr Tra), 749041930637 (Bumper), 68604076A0638 (Shld Asm), GW9301099 (Tiller Woodruff Key), 91104110 (Troy-Bilt Shaft-Drive), 73604257 (Lawn & Garden Equipment Washer), GW1901 (Tiller Tine Assembly), 73604192 (Troy-Bilt Washer:Flat), 742042270637 (Tiller Bolo Tine, Left), GW55044 (Troy-Bilt Tab, Conduit Mount), 94604208 (Lawn Mower Drive Control Cable), 94604058 (Tiller Reverse Cable), 91704383 (Troy-Bilt Gear-Worm 30), 91704380 (Tiller Tine Input Sprocket Assembly), GW9301 (Troy-Bilt Key, 3/16 Sq. X 1), 71404048 (Pin:cot:int), 92104031 (Tiller Wheel Shaft Oil Seal), 7250157 (Lawn & Garden Equipment Cable Tie), 7100514 (Yard Machines Lawn Tractor Bolt), 7360119 (Lock Washer), 71204063 (Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18), 71204065 (MTD Yard Machines Lawn Tractor Flange Nut).
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 21A-634A766: 95604183 (Engine Pulley), 65604023A (Pulley Assembly), 73105268 (Belt Cover), 65604005A (Tiller Transmission Pulley), 786042750637 (Troy-Bilt Arm:Idler:Fo), 1916658 (Reverse Belt), 1916657 (Belt), 95404091 (Belt-v Rev Drv 3), 95404090 (Tiller Forward Drive Belt).
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-634A766: 749042080638 (Handle), 786042910638 (Hood Bracket), 68604077B (SHIELD ASM-T), 786042900638 (Hood Bracket), 71004163 (Tiller Screw), 75305578 (Tiller Wheel Axle Service Kit), 91904013 (Transmission Housing), 7500258 (Ryobi Lawn & Garden Equipment Spacer), 73204185 (Tiller Forward Clutch Spring), 68604077B0638 (Shield), 7260201 (Lawn Tractor Push Cap), 7100376 (Ryobi Lawn Tractor Screw), 7100599 (MTD Lawn Tractor 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-634A766: 92104229 (Tiller Gear Case Cover Gasket).
Before you buy
Match 21A634A766 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.