Description
EP-PWD3500 Planetary Winch Drive Gearbox – 35,000 Nm
Brevini PWD3500 Compatible Replacement | EVER POWER
The EP-PWD3500 is EVER POWER’s solution for applications where standard-size gearboxes cannot handle the torque or duty. Replacing the Brevini riduttori PWD3500, this 3-to-4-stage planetary drive delivers 35,000 Nm peak output torque with a broad ratio selection covering 30:1 to 250:1, all within a sealed, corrosion-resistant housing designed for the harshest offshore and heavy industrial environments.
Product Overview
Served industries: offshore pipe-laying vessels, active heave compensation (AHC) winch systems, large crawler and ring cranes, ROV launch and recovery systems (LARS), and subsea cable tensioners. The EP-PWD3500 incorporates a torsionally flexible coupling interface at the motor end to absorb hydraulic motor torque ripple and protect internal gears from resonance-induced fatigue.
Technical Parameters
| Parameter | Value |
|---|---|
| Model | EP-PWD3500 |
| Replaces | Brevini riduttori PWD3500 |
| Max Output Torque | 35,000 Nm |
| Gear Stages | 3 – 4 |
| Ratio Range | 30:1 – 250:1 |
| Max Input Speed | 1,000 rpm |
| Continuous Thermal Limit | 55 kW |
| Backlash | <= 9 arcmin |
| Housing Material | GGG50 ductile iron + marine epoxy coating |
| Lubrication | Synthetic ISO VG 320 (factory filled) |
| Protection Class | IP66 (IP68 option) |
| Operating Temp. | -35 degC to +85 degC |
| Approx. Weight | ~165 kg |
| Special Feature | Torsional flex coupling interface (motor end) |
Working Principle
Where ratio requirements exceed what a 3-stage design can efficiently provide, the EP-PWD3500 optionally adds a fourth reduction stage within the same external envelope, reaching 250:1 overall ratio without tandem-connecting two separate gearboxes. The torsional flex coupling at the motor interface absorbs cyclic torque ripple from hydraulic motors (typically 5-15% ripple amplitude), preventing resonant excitation of the planetary gear mesh – especially important in AHC applications where motor speed and direction reverse frequently.
Core Advantages
| ◼ Up to 250:1 Single-Unit Ratio Eliminates costly tandem gearbox arrangements for very high reduction needs. |
◼ Torsional Flex Motor Interface Damps motor torque ripple, protecting gear teeth from fatigue at high cycle counts. |
| ◼ Marine-Grade Coating 720+ hour salt spray test. Suitable for offshore C5M corrosion zone. |
◼ -35 degC Cold Start Capable Low-pour-point synthetic oil and cold-rated FKM seals enable Arctic duty. |
| ◼ Compatible Replacement Fit Engineered to match Brevini PWD3500 bolt pattern and shaft dimensions for direct retrofit. |
|
Structure and Material Technology
The housing is externally coated with a marine-grade two-part epoxy system (total DFT >= 250 microns). Gear materials are 17CrNiMo6 or 18CrNiMo7-6 vacuum-arc-remelted for superior core toughness. The output shaft runs in a double-row tapered roller bearing assembly pre-loaded at the factory to prevent axial play under combined radial/axial rope loads.
Typical Application Scenarios
| Industry | Application | Scenario Notes |
|---|---|---|
| Offshore | AHC (Active Heave Compensation) winch | Frequent direction reversals demand low backlash and torque-ripple damping – both delivered. |
| Subsea | LARS (Launch And Recovery System) | High-ratio (200:1+) allows very precise lowering speed control for ROV deployment. |
| Pipeline | Pipe-laying vessel tensioner drive | Continuous high-torque hold combined with slow linear speed – ideal for 3-4 stage design. |
| Heavy Crane | Crawler crane main hoist upgrade | Arctic-rated units deployed in construction projects with no cold-start issues. |
Selection Guide
- AHC or Standard Winch? – AHC applications need the flex coupling and low backlash option.
- Required Ratio – 3-stage for 30:1-150:1; 4-stage for 150:1-250:1.
- Motor Type and Displacement – for proper torque and speed matching.
- Corrosion Zone – C4, C5M (offshore) or CX (very aggressive).
- Temperature Range – Arctic-rated variants use different seals and lubricant; please specify.
Talk to our offshore application specialists for configuration support.
Brevini PWD3500 vs. EVER POWER EP-PWD3500
Disclaimer: Brevini riduttori PWD3500 is referenced for cross-reference assistance only. EVER POWER is an independent manufacturer. This listing does not imply any partnership with or endorsement by Brevini.
| Aspect | Brevini PWD3500 | EVER POWER EP-PWD3500 |
|---|---|---|
| Price | European OEM premium | Competitive aftermarket pricing |
| Lead Time | 12-20 weeks typical | 4-7 weeks |
| Max Ratio (single unit) | Standard range | Up to 250:1 without tandem connection |
| AHC Motor Interface | Rigid coupling standard | Torsional flex coupling available |
| Arctic Variant | Special order only | Standard catalogue option |
Motor packages: 
matched hydraulic and electric motors supplied by EVER POWER on request.
Quality Certifications and Service Commitment
- ISO 9001:2015 certified quality management system.
- CE Marking – Machinery Directive 2006/42/EC.
- DNV GL / Bureau Veritas third-party inspection available on request.
- 18-month warranty – full manufacturing defect coverage.
More at EVER POWER About Us.
Case Studies – Engineer Field Notes
| Country | Application | Feedback |
|---|---|---|
| United Kingdom | North Sea AHC winch replacement on MPSV | “The flex coupling option was the deciding factor. Our original Brevini had gear wear from motor ripple. The EVER POWER unit has run without that issue for 11 months.” – Chief Engineer, Aberdeen. |
| Russia | Siberian pipeline crawler crane main hoist | “Cold-start at -32 degC in January. No stiffness or unusual noise. The Arctic-spec lubrication clearly works.” – Site Engineer, Yamal Peninsula. |
| Singapore | LARS winch for deep-water ROV support vessel | “EVER POWER delivered all 4 units within 5 weeks, including DNV witness testing.” – Project Engineer, Jurong. |
Frequently Asked Questions
Q: Can the EP-PWD3500 be supplied with DNV or BV certification?
A: Yes. Third-party witness testing by DNV GL or Bureau Veritas can be arranged. Please state this at order stage.
Q: Is the flex coupling replaceable in the field?
A: Yes. The torsional flex element is a serviceable cartridge. Replacement coupling sets are held in stock.
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