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EP-CTU3300 Planetary Track Drive Gearbox – 33,000 Nm
Brevini CTU3300 Compatible Replacement | EVER POWER
The EP-CTU3300 is EVER POWER’s answer to demanding high-cycle track drive applications where fatigue life, not just peak torque, defines product success. Engineered as a drop-in replacement for the Brevini riduttori CTU3300, this unit delivers 33,000 Nm of output torque backed by an enhanced gear geometry specifically tuned for continuous-duty tracked earthmoving and material handling equipment.
Product Overview
Target machines: 25-35 t excavators, large crawler cranes, tracked cold planers, heavy-duty mining dozers and large offshore jack-up leg drives. The EP-CTU3300 incorporates a reinforced output-stage carrier with 4-planet configuration, reducing per-tooth stress by approximately 25% versus a conventional 3-planet design at the same torque rating – directly translating to longer overhaul intervals on high-hour machines.
Technical Parameters
| Parameter | Value |
|---|---|
| Model | EP-CTU3300 |
| Replaces | Brevini riduttori CTU3300 |
| Max Output Torque | 33,000 Nm |
| Gear Stages | 3 |
| Planet Count (Output Stage) | 4 planets |
| Ratio Range | 30:1 – 150:1 |
| Max Input Speed | 2,500 rpm |
| Overload Capacity | 2.8x rated (momentary) |
| Housing Material | GGG50 ductile iron |
| Protection Class | IP68 |
| Operating Temp. | -30 degC to +85 degC |
| Approx. Weight | ~102 kg |
| Brake | Spring multi-disc / hydraulic release |
| Surface Treatment | Epoxy primer + polyurethane topcoat |
Working Principle
Three sequential planetary stages are coaxially nested within the housing. The first two stages handle speed reduction from the hydraulic motor at relatively high input speeds; the third stage uses the 4-planet carrier to share the final high-torque output load across four simultaneous tooth contact zones. This arrangement is quieter than a 3-planet output stage and produces a more even torque ripple waveform, reducing vibration transmitted through the track frame into the operator cab.
Helical planet gears in the final stage provide an axial contact ratio greater than 1.0, ensuring smooth handover between successive tooth engagements even at the very low output speeds typical of slow travel and positioning moves.
Core Advantages
| ► 4-Planet Output Stage ~25% lower tooth stress vs 3-planet – measurably longer overhaul intervals on high-hour machines. |
► Helical Final Stage Smooth torque handover; reduced cab vibration and noise versus straight-cut alternatives. |
| ► 2.8x Overload Tolerance Momentary torque spikes during trench wall strikes or hard-ground scraping are absorbed without tooth damage. |
► Extended Overhaul Interval Synthetic VG 220 oil + sealed housing supports 2,500 hour oil change intervals. |
| ► Brevini CTU3300 Drop-In Fit Identical flange and spline interface – installs in the original machine cutout without any adaptation. |
|
Structure and Material Technology
Gear blanks are precision-forged from 20CrMnTi and 17CrNiMo6 steels for optimal core strength and case hardness balance. Carburising depth is controlled to 0.9-1.3 mm; tooth flanks are profile-ground to ISO accuracy grade 5. The output flange bearing is a double-row angular contact ball bearing sized to carry the full sprocket chain load in combined axial and radial directions. All external surfaces are coated with a two-coat epoxy primer + polyurethane topcoat system tested to 480 hours salt spray per ISO 9227.
Typical Application Scenarios
| Industry | Machine Type | Key Requirement |
|---|---|---|
| Earthmoving | 30 t hydraulic excavator | High-cycle travel on abrasive rocky terrain; low vibration transmission into cab. |
| Road Maintenance | Large tracked cold planer | Slow precise travel speed control during surface milling; high thrust force. |
| Marine/Offshore | Jack-up leg rack drive | Slow high-torque drive; smooth torque essential to prevent leg structure fatigue. |
| Mining | Medium crawler dozer | Continuous pushing duty with frequent direction reversals on soft overburden. |
Selection Guide
- Duty Cycle Class – Continuous S1 or intermittent S3? High-hour machines (8,000 h/year) should use the 4-planet output stage as standard.
- Peak Torque with Shock Factor – Multiply rated drawbar torque by 2.0-2.5 for hard-ground excavation; EP-CTU3300 handles 2.8x.
- Travel Speed Range – Low-speed positioning vs high-speed tramming; select ratio accordingly within 30:1-150:1.
- Cab Vibration Limit – Specify helical final stage if operator vibration level (ISO 2631) is a design constraint.
- Motor Flange – SAE-B, SAE-C or ISO metric; provide motor model for direct confirmation.
Speak to our engineers for a torque and duty-cycle sizing review.
Brevini CTU3300 vs. EVER POWER EP-CTU3300
Disclaimer: EVER POWER references the Brevini riduttori CTU3300 model number solely to help customers identify a compatible replacement. We do not manufacture or imply affiliation with Brevini. No intellectual property of Brevini is reproduced. Our replacement unit is an independently designed product that is dimensionally and functionally compatible.
| Aspect | Brevini CTU3300 | EVER POWER EP-CTU3300 |
|---|---|---|
| Planet Count (Output) | 3 planets | 4 planets – lower stress, longer life |
| Price | OEM premium | Competitive aftermarket rate |
| Lead Time | 10-18 weeks | 3-6 weeks |
| Overload Tolerance | 2.5x rated | 2.8x rated |
| Vibration (helical) | Straight-cut standard | Helical final stage available |
Complete track drive packages including hydraulic motor available from EVER POWER. Request a package quotation.
Quality Certifications and Service Commitment
- ISO 9001:2015 – Traceability from raw material to finished gearbox.
- CE Marking – Machinery Directive compliance documentation supplied with every unit.
- 18-month warranty covering material and workmanship defects.
- Hydrostatic leak test on 100% of units before shipping.
Case Studies – Engineer Field Notes
| Country | Application | Feedback |
|---|---|---|
| Canada | 30 t excavator fleet renewal, oil sands site, 12 units | “Abrasive sand is brutal on seals. EP-CTU3300 held up for 18 months without a single seal failure. The 4-planet output stage is visibly more robust than what we had before.” – Equipment Manager, Fort McMurray. |
| Italy | Large tracked cold planer for highway resurfacing contract | “Smooth milling speed is everything for road quality. The helical gearing reduced the cab vibration reading below our operator health limit without additional damping.” – Project Engineer, Milan. |
| Indonesia | Medium crawler dozer, coal mine overburden stripping | “High-cycle pushing duty in tropical heat. No thermal issues reported after 12 months. EVER POWER’s local agent supported us very well.” – Mine Maintenance Lead, Kalimantan. |
Frequently Asked Questions
Q: Does the helical final stage require a different lubrication spec?
A: No – the same synthetic ISO VG 220 oil serves both straight-cut and helical configurations. Helical gears generate slightly more heat, but within the existing thermal budget of the housing.
Q: What is the rated static brake holding torque?
A: The spring brake provides a minimum static holding torque of 1.5x the rated output torque, satisfying SAE J1229 slope-hold requirements at 35 deg gradient.
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