About the Boston Gear 920
Boston Gear's 700 and 900 series worm reducers are among the most widely used gear drives in light-to-medium industrial applications. Their simple worm gear design is highly rebuildable, and Altra Industrial Motion maintains good parts availability. The F-series parallel shaft units handle heavier applications.
The 920 is a worm gear, heavy duty unit with a rated capacity of 1.5–5 HP and output torque of 780–3,120 ft-lb. Typical operating weight is 28–51 lbs. Mounting configurations include Foot, flange.
Boston Gear worm units most commonly fail from worm gear wear (bronze worm wheel against steel worm), seal failure causing oil loss, and bearing fatigue in high-cycle applications.
When your Boston Gear 920 fails, downtime costs mount fast. Our standard rebuild turnaround is 8–14 business days with free freight both directions. Emergency 24–72 hour service is available. We publish pricing before teardown — no surprises.
Technical Specifications
| Model Number | 920 |
| Gear Type | Worm gear, heavy duty |
| Power Range | 1.5–5 HP |
| Output Torque | 780–3,120 ft-lb |
| Operating Weight | 28–51 lbs |
| Mounting Options | Foot, flange |
| Housing Material | Cast iron |
| Parts Availability | Altra Industrial Motion distribution — good US availability |
| Industries Served | Conveyors, packaging, food processing, material handling, HVAC |
Why Repair Your Boston Gear 920 Instead of Replacing It?
- Bronze worm wheels are standard replacement parts — available from Altra and aftermarket suppliers.
- Boston Gear's simple design means teardown and rebuild is straightforward — lower labor cost than more complex gear types.
- The cast iron housing is almost always reusable.
Frequently Asked Questions — Boston Gear 920
How long does a Boston Gear worm reducer last?
In properly lubricated, correctly sized applications, Boston Gear worm reducers typically last 15–25 years. High-cycle applications (>1,000 starts/day) or undersized units wear faster. Bronze worm wheel replacement is the most common repair. Call (641) 519-6270.
How much does a Boston Gear repair cost?
700 and 900 series worm reducer rebuilds typically run $300–1,500. F-series parallel shaft units run $800–4,000. We publish pricing before teardown. Call (641) 519-6270.
Can you get Boston Gear replacement worm wheels?
Yes — we source bronze worm wheels from Altra Industrial Motion and aftermarket suppliers. Most common 700 and 900 series worm wheels are available within 1–2 weeks. Call (641) 519-6270.
Do you buy surplus Boston Gear reducers?
Yes — 700, 800, 900 series and F-series units. Send a nameplate photo to surplus713@gmail.com for a same-day cash offer.
Related Boston Gear (Altra Industrial Motion) Models
Pricing — Boston Gear 920
| New OEM UnitFactory list, 16–30 wk lead | $1,188–$3,564 |
| Used / SurplusTested, as-is condition | $189–$729 |
| Standard Shop RepairIndustry average, 10–18 days | $621–$1,862 |
| Our Rebuild Price8–14 business days, free freight | $540–$1,620 |
| Cash Buyback OfferWe buy as-is, same day offer | $64–$291 |
Estimates only. Final quote provided after free teardown inspection. Pricing varies by condition and damage.