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EP-PWD3700 Extreme-Duty Planetary Winch Drive Gearbox – 37,000 Nm
Brevini PWD3700 Compatible Replacement | EVER POWER
The EP-PWD3700 is EVER POWER’s flagship planetary winch drive gearbox. Engineered to directly replace the Brevini riduttori PWD3700, this unit achieves a class-leading 37,000 Nm rated output torque and a maximum ratio of 300:1, making it the go-to choice for deepwater crane operators, offshore heavy-lift contractors and extreme-duty industrial hoist builders.
Product Overview
Target applications: deepwater crane main hoists (300 m+ depth), semi-submersible rig drawworks, heavy pipelay tensioner main drives, offshore wind turbine foundation installation cranes, and large-format industrial furnace car drives. The EP-PWD3700 is available with optional integrated oil temperature monitoring and vibration sensor ports for integration into predictive maintenance systems.
Technical Parameters
| Parameter | Value |
|---|---|
| Model | EP-PWD3700 |
| Replaces | Brevini riduttori PWD3700 |
| Max Output Torque | 37,000 Nm |
| Gear Stages | 3 – 4 |
| Ratio Range | 35:1 – 300:1 |
| Max Input Speed | 800 rpm |
| Continuous Thermal Limit | 65 kW |
| Overload Capacity | 3.0x rated torque (momentary) |
| Housing Material | GGG50 ductile iron + marine epoxy (C5M) |
| Lubrication | Synthetic ISO VG 320 or PAO VG 460 |
| Protection Class | IP66 / IP68 optional |
| Operating Temp. | -35 degC to +90 degC |
| Approx. Weight | ~190 kg |
| Monitoring Options | Oil temp sensor port, vibration sensor boss |
| Brake Option | Spring wet multi-disc / dry disc / none |
Working Principle
The EP-PWD3700’s 4-stage planetary arrangement stacks four concentric reduction stages coaxially. Each stage’s planet carrier becomes the sun shaft input to the next, achieving 300:1 reduction in a compact form factor. The output stage bearing pre-load system is factory-set using precision shims so the tapered roller bearing assembly carries both radial rope loads and axial fleet angle loads without play developing over service life. An optional external oil cooler circuit is available for tropical-climate duty above 40 degC ambient.
Core Advantages
| ★ Class-Leading 37,000 Nm Torque Top-of-range PWD series capacity – handles the most demanding crane and hoist loads. |
★ 300:1 in a Single Housing Eliminates tandem gearbox systems, reducing overall drivetrain length and weight. |
| ★ Condition Monitoring Ready Oil temperature and vibration sensor ports enable Industry 4.0 predictive maintenance integration. |
★ 3.0x Overload Tolerance Momentary overload capacity handles unexpected load spikes without gear tooth damage. |
| ★ C5M Marine Coating + IP68 Option Full offshore corrosion and immersion protection for the most aggressive environments. |
|
Structure and Material Technology
The EP-PWD3700 uses 18CrNiMo7-6 vacuum-arc-remelted (VAR) steel – the same grade used in aircraft and wind turbine main gearboxes – carburised to 1.0-1.5 mm case depth and ground to DIN ISO 1328 accuracy class 5. The housing interior is shot-peened to improve fatigue resistance. All external fasteners are stainless steel A4-80 to prevent galvanic corrosion in offshore installations.
Typical Application Scenarios
| Industry | Application | Scenario Notes |
|---|---|---|
| Deepwater | Offshore heavy crane main hoist (300 m+) | 300:1 ratio provides precise positioning at depth with large hydraulic motors. |
| Oil & Gas | Semi-sub rig drawworks main drive | 37,000 Nm handles combined hook and drill-string weight spikes during jarring. |
| Renewable Energy | Offshore wind monopile upending crane | Slow controlled rotation of 500+ tonne monopiles requires high torque at very low speed. |
| Steel Industry | EAF electrode positioning drive | Precise low-speed drive under extreme thermal radiation environment. |
Selection Guide
- Maximum Hook Load (kN) – Define peak with all rigging dynamic factors applied.
- Required Lowering Speed (m/min) – Used to derive drum speed and required ratio.
- Number of Part Lines – Affects drum torque calculation.
- Motor Specification – Dual-motor input flanges available for very high torque requirements.
- Monitoring Requirements – State if oil temperature and vibration monitoring ports are needed.
- Classification Society – DNV, BV, ABS, Lloyd’s; third-party inspection arranged accordingly.
Engage our heavy-lift engineering team for a detailed selection study at no cost.
Brevini PWD3700 vs. EVER POWER EP-PWD3700
Disclaimer: The Brevini riduttori PWD3700 model is referenced solely to assist customers identifying a functionally compatible alternative. EVER POWER is not affiliated with Brevini. The EP-PWD3700 carries its own original design specifications and independent warranty.
| Aspect | Brevini PWD3700 | EVER POWER EP-PWD3700 |
|---|---|---|
| Price Level | High-end OEM Europe | Substantially lower total cost of ownership |
| Lead Time | 14-22 weeks standard | 5-8 weeks |
| Max Ratio | Standard range | Up to 300:1 single unit |
| Condition Monitoring | Not standard | Sensor ports standard option |
| Class Society Inspection | Available (at premium) | Available at competitive rate |
| Dual-Motor Input | Special order | Standard configuration option |
EVER POWER can supply matched hydraulic piston motors or electric torque motors as a complete drive system.
Quality Certifications and Service Commitment
- ISO 9001:2015 – Material traceability to melt certification.
- CE Marking – EU Machinery Directive 2006/42/EC compliant.
- DNV GL / BV / ABS 3rd-party inspection available on request.
- 18-month warranty from despatch date.
- Dedicated after-sales account manager for registered heavy-lift customers.
Visit EVER POWER About Us for our full quality and company profile.
Case Studies – Engineer Field Notes
| Country | Application | Feedback |
|---|---|---|
| United Arab Emirates | Offshore heavy crane main hoist, Persian Gulf | “The oil temperature sensor allowed us to optimise the cooling circuit remotely. No unplanned downtime in 12 months.” – Crane Superintendent, Abu Dhabi. |
| South Korea | Offshore wind foundation installation vessel main winch | “Dual-motor input option was essential for our synchronised lifting programme. EVER POWER engineered the flange arrangement to our drawing within 3 weeks.” – Lead Engineer, Busan. |
| Mexico | Semi-sub drill rig drawworks for deep Gulf wells | “We replaced 2 Brevini units with EP-PWD3700. Commissioning was straightforward and the dimensional match was exact. Significant cost saving versus the original OEM quote.” – Mechanical Supervisor, Veracruz. |
Frequently Asked Questions
Q: Is 3.0x overload a one-time or repeatable rating?
A: The 3.0x rating covers momentary (less than 5-second) transient overloads. Repeated application must be reviewed by our engineers to assess cumulative fatigue impact.
Q: Can the gearbox be fitted with dual-motor input flanges?
A: Yes. A dual-input configuration allows two motors to share the driving torque. Contact us for the dual-input technical datasheet.
Q: What condition monitoring sensor types are supported?
A: G1/2 threaded boss positions for PT100 oil temperature probes and M8 tapped pads for accelerometer attachment. Compatible with major PLC and SCADA systems.
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