About the Flender Cavex 400
Flender gear drives — now part of Siemens — are the European standard for heavy industrial applications. H-series and B-series helical units are found in cement plants, paper mills, and steel facilities worldwide. Cavex worm gear units handle the lighter applications. All Flender units are built to high precision standards and are highly rebuildable.
The Cavex 400 is a worm gear unit with a rated capacity of 2.2–45 kW and output torque of 3,600–12,600 Nm. Typical operating weight is 210–385 lbs. Mounting configurations include Foot, flange.
Flender units most commonly fail from gear tooth pitting in high-load applications, bearing fatigue, and seal failure in dusty cement plant environments.
When your Flender Cavex 400 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 | Cavex 400 |
| Gear Type | Worm gear |
| Power Range | 2.2–45 kW |
| Output Torque | 3,600–12,600 Nm |
| Operating Weight | 210–385 lbs |
| Mounting Options | Foot, flange |
| Housing Material | Cast iron, precision-machined |
| Parts Availability | Siemens/Flender US distribution — good availability for current models |
| Industries Served | Cement, mining, steel, paper, chemical, power generation |
Why Repair Your Flender Cavex 400 Instead of Replacing It?
- Flender's precision manufacturing means housings and shafts are almost always reusable — only gears and bearings typically need replacement.
- Siemens/Flender maintains US parts inventory for current production models.
- Flender's modular design allows component-level replacement without full disassembly.
Frequently Asked Questions — Flender Cavex 400
How much does a Flender gear drive repair cost?
H-series and B-series rebuilds typically run $2,000–25,000 depending on size and damage. Cavex worm units run $600–3,000. We publish pricing before teardown. Call (641) 519-6270.
Can you get Flender replacement gears?
Yes — we source Flender gears from Siemens/Flender US and precision gear manufacturers. Custom gear cutting available for obsolete models. Call (641) 519-6270.
Do you repair Flender units for cement plant applications?
Yes — cement plant gearbox repair is a specialty. We rebuild Flender H-series mill drives, kiln drives, and VRM gearboxes. Call (641) 519-6270.
Do you buy surplus Flender gear drives?
Yes — H-series, B-series, Cavex, and Motox units. Send a nameplate photo to surplus713@gmail.com for a same-day cash offer.
Related Flender (Siemens) Models
Pricing — Flender Cavex 400
| New OEM UnitFactory list, 16–30 wk lead | $10,850–$32,550 |
| Used / SurplusTested, as-is condition | $1,085–$4,185 |
| Standard Shop RepairIndustry average, 10–18 days | $3,564–$10,695 |
| Our Rebuild Price8–14 business days, free freight | $3,100–$9,300 |
| Cash Buyback OfferWe buy as-is, same day offer | $372–$1,674 |
Estimates only. Final quote provided after free teardown inspection. Pricing varies by condition and damage.