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EP-CTD3700 Flagship Planetary Track Drive Gearbox ?? 37,000 Nm
Brevini CTD3700 Compatible Replacement | EVER POWER
The EP-CTD3700 is EVER POWER’s most powerful planetary track drive gearbox ?? the flagship of the CTD replacement series. Engineered to replace the Brevini riduttori CTD3700, this unit delivers a class-leading 37,000 Nm output torque and a maximum ratio of 300:1 from a single sealed housing, serving the largest hydraulic mining excavators, ultra-heavy crawler cranes and extreme-duty offshore tracked platforms where performance and reliability are non-negotiable.
Product Overview
Target machines: 70-100 t+ hydraulic excavators, large-class crawler cranes (600 t+ lifting), TBM backup crawler track systems, heavy tracked launch and recovery systems for subsea equipment, and industrial tracked furnace car drives in steel mills. The EP-CTD3700 uses 18CrNiMo7-6 vacuum-arc-remelted steel throughout all gear stages ?? the same material specification used in aircraft landing gear gearboxes ?? delivering maximum core toughness for peak shock loads that would fracture lower-grade materials.
Optional integrated dual oil temperature monitoring (input and output sump) combined with vibration monitoring provides a comprehensive health data stream for any predictive maintenance platform.
Technical Parameters
| Parameter | Value |
|---|---|
| Model | EP-CTD3700 |
| Replaces | Brevini riduttori CTD3700 |
| Max Output Torque | 37,000 Nm |
| Gear Stages | 3 – 4 |
| Ratio Range | 40:1 – 300:1 |
| Max Input Speed | 2,000 rpm |
| Continuous Thermal Limit | 65 kW |
| Overload Capacity | 3.0x rated (momentary) |
| Gear Steel Grade | 18CrNiMo7-6 VAR |
| Tooth Accuracy | DIN ISO 1328 Class 5 |
| Housing Material | GGG50 + C5M marine epoxy |
| Lubrication | PAO VG 460 (factory filled) |
| Protection Class | IP68 |
| Operating Temp. | -35 degC to +90 degC |
| Approx. Weight | ~158 kg |
| Monitoring | Dual oil temp (PT100) + vibration sensor boss |
| Brake | Spring multi-disc failsafe / hydraulic release |
| External Fasteners | Stainless A4-80 |
Working Principle
The 4-stage coaxial arrangement achieves 300:1 in a single housing by stacking four planetary stages. Stage 1 accepts the high-speed motor input at up to 2,000 rpm; each successive stage multiplies torque while reducing speed. The final output stage uses a large-bore taper roller bearing assembly factory-shimmed to zero axial play ?? essential for carrying the combined chain tension, sprocket offset and overturning loads of a 90 t excavator track system.
The dual oil temperature monitoring uses a PT100 probe in both input-side and output-side oil sumps. Comparing temperatures between the two positions detects abnormal heat generation in individual gear stages before it manifests as visible damage ?? enabling predictive maintenance action with 3-4 weeks’ advance notice based on real operating data from multiple fleet installations.
Core Advantages
|
◆ Class-Leading 37,000 Nm
Top of the CTD series ?? no compromise for the largest tracked machines in operation. |
◆ 300:1 Single Housing
Eliminates tandem gearbox complexity for very high reduction applications. |
|
◆ VAR Steel Throughout
18CrNiMo7-6 vacuum-arc-remelted steel in all gear stages ?? aircraft landing gear specification. |
◆ Dual Temperature Monitoring
Input and output sump temperature comparison enables stage-specific fault detection. |
|
◆ C5M Marine Epoxy + A4-80 Fasteners
Full offshore corrosion protection ?? suitable for acid mine drainage and saltwater environments. |
Structure and Material Technology
All gear blanks in every stage are precision-forged from 18CrNiMo7-6 VAR steel, vacuum degassed to minimise inclusion content. Carburising depth is controlled to 1.0-1.5 mm; hardness profiles are documented per unit in the quality record. Tooth flanks are ground to DIN ISO 1328 accuracy class 5. The housing interior is shot-peened in all bore and seat zones to improve fatigue resistance. All exterior threaded fasteners are stainless steel A4-80 ?? no galvanic corrosion risk in wet mine or offshore environments. The output flange registers are ground to 0.010 mm total runout for accurate sprocket mounting on large-class machines.
Typical Application Scenarios
| Industry | Machine / Use | Key Requirement |
|---|---|---|
| Mining | 90 t excavator, hard rock open cast | VAR steel handles peak shock loads from buried blasted rock; monitoring prevents unplanned stops. |
| Crane | 550 t crawler crane undercarriage | 300:1 ratio provides precise ultra-slow travel during lift setup on soft ground. |
| Tunnelling | TBM backup crawler system | Continuous 24/7 slow push; dual temperature monitoring tracks stage health continuously. |
| Steel Mill | 200 t furnace car track drive | Ultra-slow precise load movement; spring brake holds 200 t car on inclined transfer route. |
Selection Guide
- Machine Class (t) ?? Provide operating weight and worst-case drawbar pull for torque confirmation.
- Stage Count ?? 3-stage for 40:1-120:1; 4-stage for 120:1-300:1.
- Monitoring Level ?? Basic (output sump only) or dual (input + output) temperature monitoring.
- Environment ?? Specify acid mine drainage, saltwater or standard for appropriate coating and fastener grade.
- Classification Society ?? For offshore, state DNV, BV or ABS requirement at order.
- Motor ?? Provide hydraulic motor model, displacement and maximum pressure for complete system design.
Engage EVER POWER senior engineers for a complete heavy-machine track drive system study.
Brevini CTD3700 vs. EVER POWER EP-CTD3700
Important Notice: EVER POWER references the Brevini riduttori CTD3700 model number solely to assist customers in identifying a compatible replacement. We do not manufacture, sell, or claim any affiliation with Brevini riduttori. No trademarks or intellectual property of Brevini are reproduced. The EP-CTD3700 is an independently designed and manufactured product that is dimensionally and functionally compatible.
| Aspect | Brevini CTD3700 | EVER POWER EP-CTD3700 |
|---|---|---|
| Price | Highest OEM European tier | Substantially lower total cost |
| Lead Time | 14-22 weeks | 5-8 weeks |
| Gear Steel | Standard alloy steel | 18CrNiMo7-6 VAR ?? aircraft grade |
| Max Ratio (single unit) | Standard range | Up to 300:1 |
| Dual Temp Monitoring | Not available | Standard option |
| Class Society Inspection | Available at premium | DNV/BV/ABS at competitive rate |
Complete heavy track drive packages ?? gearbox + high-torque hydraulic motor + installation hardware ?? available from EVER POWER. Request a turnkey drive package.
Quality Certifications and Service Commitment
- ISO 9001:2015 ?? VAR melt certificate traceable to every finished unit.
- CE Marking ?? Machinery Directive 2006/42/EC.
- DNV GL / Bureau Veritas / ABS inspection available on request.
- 18-month warranty from dispatch date.
- Dedicated account engineer for registered large-machine fleet customers.
- Emergency planet set, sun shaft and seal kit dispatched within 48 hours.
Visit EVER POWER About Us for our complete quality and capability profile.
Case Studies ?? Engineer Field Notes
| Country | Application | Customer Feedback |
|---|---|---|
| Australia | 90 t excavator fleet, Pilbara iron ore, 8 units | “Hard magnetite rock is the ultimate test. After 20 months and 18,000 fleet hours: zero gear failures. The dual temperature monitoring flagged one bearing developing abnormally ?? we replaced it on schedule, zero unplanned downtime.” ?? Equipment Director, Port Hedland. |
| Germany | 550 t crawler crane, offshore wind farm monopile installation | “300:1 ratio using existing fleet motors ?? no motor replacement needed. EVER POWER confirmed compatibility within 24 hours of receiving our crane drawing.” ?? Project Manager, Hamburg. |
| South Africa | 200 t furnace car track drive, platinum smelter, 4 units | “Acid fume environment plus floor wash-down is corrosive to everything. After 2 years: no coating failure, no fastener corrosion, no seal failure. Best result we have seen from any supplier.” ?? Plant Engineer, Rustenburg. |
Frequently Asked Questions
Q: What is the benefit of VAR steel over standard alloy steel for planetary gears?
A: Vacuum arc remelting removes non-metallic inclusions that act as fatigue crack initiation sites. VAR steel consistently shows 20-40% longer fatigue life in rotating gear applications at equivalent hardness.
Q: Can the EP-CTD3700 be certified for use on a DNV-classed offshore structure?
A: Yes. Third-party witness inspection and certification by DNV GL can be arranged. Please state this requirement at order, as it adds approximately 2 weeks to lead time.
Q: How does dual temperature monitoring improve predictive maintenance?
A: By comparing input and output sump temperatures, abnormal heat generation in individual stages can be identified. In fleet experience, this provides 3-6 weeks of advance warning before a failure that would otherwise be undetected until audible noise or chip-in-oil detection.
Q: What is the extended warranty option?
A: An extended 24-month warranty is available under a service agreement. Contact EVER POWER for terms.
Partner With EVER POWER
For the world’s most demanding tracked machine applications, EVER POWER provides the engineering depth, material quality and global supply capability to keep your fleet operating. Browse our complete CTD replacement catalogue, learn about EVER POWER’s capabilities, or contact our engineering team now. Homepage: planetary-gear-box.top.
