Parts for 21A634B063 — MTD
We found 42 parts confirmed to fit the MTD 21A634B063.
Same parts list as 21A630C063 (MTD). 21A634B063 shares an identical confirmed parts list with 21A630C063 (MTD). That page is the canonical version of this parts list — use it if you want the primary reference, or stay here since the list below is exactly the same for 21A634B063.
Compatibility table
| Part # | Part | Also fits | Reference price |
|---|---|---|---|
| 75305332 | Kit-tilr Tra | 5 models | $1219.66 · Amazon |
| 73105268 | Belt Cover | 10 models | $105.34 · Amazon |
| 1904281 | Drive Shaft Assembly | 10 models | $183.71 · Amazon |
| 1916726 | Forward Guide | 10 models | $9.81 · Amazon |
| 786042910638 | Hood Bracket | 10 models | $21.67 · Amazon |
| 71504034 | MTD Lawn & Garden Equipment Roll Pin | 10 models | $34.32 · Amazon |
| 1916724 | Reverse Spring | 10 models | $6.22 · Amazon |
| GW1325C | Shim | 10 models | $28.57 · Amazon |
| 68604076A0638 | Shld Asm | 10 models | $114.88 · Amazon |
| 1916106001 | Tiller Drive Control Bar | 10 models | $69.69 · Amazon |
| 65604005A | Tiller Transmission Pulley | 10 models | $75.03 · Amazon |
| GW9301099 | Tiller Woodruff Key | 10 models | $5.91 · Amazon |
| 78604359 | Transmission Cover | 10 models | $35.62 · Amazon |
| 786040700637 | Bracket Mount Cover | 11 models | $62.20 · Amazon |
| 786040950637 | Guard-trns P | 11 models | $42.91 · Amazon |
| 786042900638 | Hood Bracket | 11 models | $20.77 · Amazon |
| 73604257 | Lawn & Garden Equipment Washer | 11 models | $7.29 · Amazon |
| 742042275083 | TINE-BOLO 10 | 11 models | $27.45 · 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 |
| GW9929 | Troy-Bilt Washer-#1.12 | 11 models | $9.57 · Amazon |
| 73604192 | Troy-Bilt Washer:Flat | 11 models | $15.63 · 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 |
| GW9301 | Troy-Bilt Key, 3/16 Sq. X 1 | 17 models | $10.00 · 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 |
| 7100805 | Lawn Tractor Hex Bolt | 44 models | $7.86 · Amazon |
| 7250157 | Lawn & Garden Equipment Cable Tie | 85 models | $25.35 · Amazon |
| 7100376 | Ryobi Lawn Tractor Screw | 139 models | $6.05 · Amazon |
| 7360169 | Toro Lawn & Garden Equipment Lock Washer | 154 models | $5.60 · Amazon |
| 7123004A | Ace Lawn & Garden Equipment Flange Lock Nut | 187 models | $5.81 · Amazon |
| 7360119 | Lock Washer | 529 models | $2.16 · 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-634B063: 75305332 (Kit-tilr Tra), 1904281 (Drive Shaft Assembly), 1916726 (Forward Guide), 71504034 (MTD Lawn & Garden Equipment Roll Pin), GW1325C (Shim), 68604076A0638 (Shld Asm), 1916106001 (Tiller Drive Control Bar), GW9301099 (Tiller Woodruff Key), 786040950637 (Guard-trns P), 73604257 (Lawn & Garden Equipment Washer), 742042275083 (TINE-BOLO 10), GW1901 (Tiller Tine Assembly), GW9929 (Troy-Bilt Washer-#1.12), 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), GW9301 (Troy-Bilt Key, 3/16 Sq. X 1), 71404048 (Pin:cot:int), 92104031 (Tiller Wheel Shaft Oil Seal), 7100805 (Lawn Tractor Hex Bolt), 7250157 (Lawn & Garden Equipment Cable Tie), 7360169 (Toro Lawn & Garden Equipment Lock Washer), 7123004A (Ace Lawn & Garden Equipment Flange Lock Nut), 7360119 (Lock Washer).
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-634B063: 73105268 (Belt Cover), 65604005A (Tiller Transmission Pulley), 786042750637 (Troy-Bilt Arm:Idler:Fo), 1916658 (Reverse Belt), 1916657 (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-634B063: 786042910638 (Hood Bracket), 1916724 (Reverse Spring), 78604359 (Transmission Cover), 786040700637 (Bracket Mount Cover), 786042900638 (Hood Bracket), 71004163 (Tiller Screw), 75305578 (Tiller Wheel Axle Service Kit), 91904013 (Transmission Housing), 73204185 (Tiller Forward Clutch Spring), 7100376 (Ryobi Lawn Tractor Screw), 7100599 (MTD Lawn Tractor Screw).
Before you buy
Match 21A634B063 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.