About the Marley 3500 Series
Marley Geareducer units are the standard gear drive for Marley cooling towers — found in power plants, refineries, and large commercial HVAC systems across the US. SPX Cooling Technologies provides direct factory parts support.
The 3500 is a cooling tower drive, heavy duty unit with a rated capacity of 60–250 HP and output torque of 21,500–86,000 ft-lb. Typical operating weight is 1,120–2,057 lbs. Mounting configurations include Flange-mount.
Marley Geareducer units most commonly fail from bevel gear wear, bearing fatigue, and seal failure from water exposure in cooling tower environments.
When your Marley 3500 Series 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 | 3500 |
| Gear Type | Cooling tower drive, heavy duty |
| Power Range | 60–250 HP |
| Output Torque | 21,500–86,000 ft-lb |
| Operating Weight | 1,120–2,057 lbs |
| Mounting Options | Flange-mount |
| Housing Material | Cast iron |
| Parts Availability | SPX Cooling Technologies — direct factory parts |
| Industries Served | Cooling towers, HVAC, power generation, industrial cooling |
Why Repair Your Marley 3500 Series Instead of Replacing It?
- SPX Cooling Technologies provides direct factory parts support for Marley Geareducer units.
- Cooling tower gearbox repair is a specialty — we understand the specific requirements.
- Rebuilding is almost always more cost-effective than replacing a Marley Geareducer.
Frequently Asked Questions — Marley 3500 Series
How much does a Marley Geareducer repair cost?
Marley Geareducer rebuilds typically run $1,000–5,000 depending on size. We publish pricing before teardown. Call (641) 519-6270.
Can you get Marley Geareducer replacement parts?
Yes — we source from SPX Cooling Technologies. Most parts available within 1–2 weeks. Call (641) 519-6270.
Do you repair Marley units for power plant cooling towers?
Yes — power plant cooling tower gearbox repair is a specialty. Call (641) 519-6270.
Do you buy surplus Marley Geareducer units?
Yes — all Geareducer series. Send a nameplate photo to surplus713@gmail.com for a same-day cash offer.
Related Marley (SPX Cooling Technologies) Models
Pricing — Marley 3500 Series
| New OEM UnitFactory list, 16–30 wk lead | $33,000–$99,000 |
| Used / SurplusTested, as-is condition | $3,849–$14,850 |
| Standard Shop RepairIndustry average, 10–18 days | $12,649–$37,950 |
| Our Rebuild Price8–14 business days, free freight | $11,000–$33,000 |
| Cash Buyback OfferWe buy as-is, same day offer | $1,320–$5,940 |
Estimates only. Final quote provided after free teardown inspection. Pricing varies by condition and damage.