306 Series Inline Planetary Gearbox
Trusted Across Industries:
Agricultural Machinery
Packaging & Food Processing
Construction Machinery
Mining & Quarrying
Irrigation & Water Management
Marine & Offshore
Renewable Energy
Why Choose Our 306 Series Inline Planetary Gearbox? — Our 306 Series is dimensionally verified against Bonfiglioli 306 OEM installation drawings — housing bolt pattern, output shaft geometry, motor flange pilot diameter, and oil plug positions are all confirmed before a cross-reference is issued. T2max ~12,000 N·m. Transmissible power up to 540 kW. Ratios 3.4:1 to 9,000:1. All seven standard Bonfiglioli 306 configurations covered — 306L1 through 306L4 (inline) and 306R2 through 306R4 (right-angle). Full output and input modularity. Integrated hydraulic, DC, and AC brake options. Profile-ground gears throughout. 100% factory acceptance test with every unit. Free 48-hour cross-reference — send us the nameplate data.
306 Series Inline Planetary Gearbox — Product Overview
The 306 Series Inline Planetary Gearbox is frame size 06 in the Bonfiglioli 300 Series — positioned between the 305 (T2max ~7,000 N·m) and the 307 (T2max ~18,000 N·m) — with a published T2max of 106,000 in·lbs (~12,000 N·m). This torque class is among the most widely specified in medium-duty industrial and agricultural applications worldwide, covering conveyor drives, hoist units, mixer drives, auger drives, and pump drives where the Bonfiglioli 306 is the existing OEM specification. Its compact housing and versatile modular architecture make the 306 one of the best-selling frame sizes in the entire Bonfiglioli 300 Series — and consequently one of the most frequently requested replacement models in our aftermarket range.
Our 306 Series Inline Planetary Gearbox is a confirmed dimensional replacement for every standard Bonfiglioli 306 configuration: all four inline stage variants (306L1 / 306L2 / 306L3 / 306L4) and all three right-angle variants (306R2 / 306R3 / 306R4). Every critical dimension is verified against Bonfiglioli 306 OEM installation drawings — housing bolt pattern, output shaft diameter and keyway geometry, and motor flange pilot diameter — before a cross-reference is confirmed to the customer. This verification step distinguishes our service from generic "compatible" claims: you receive a dimensional drawing with the confirmed cross-reference so your installation team can verify fit before removing the original unit from service.
Beyond the Bonfiglioli 306, our cross-reference database covers equivalent inline planetary models from Brevini (EM / ED series in the ~12,000 N·m class), Dinamic Oil (RE series), Reggiana Riduttori (RR / RA series), Comer Industries (PG / PGA series), and Rexroth (GFT series). Submit the nameplate data from any of these brands and we return a confirmed 306 Series cross-reference within 48 hours.
306 Series OEM Cross-Reference — All Model Variants & Equivalent Brands
Our 306 Series Inline Planetary Gearbox provides confirmed dimensional replacement for all OEM models listed below. All housing interfaces, output shaft geometry, torque ratings, and motor flange standards are verified against OEM installation drawings before confirmation.
① Bonfiglioli (Trasmital) — 306 Series: All Standard Model Numbers
The Bonfiglioli 306 is the primary OEM model our 306 Series is designed to replace. All seven standard ordering configurations are covered — inline (L) and right-angle (R) versions, single through four-stage reductions, and all standard output shaft suffix codes.
| Bonfiglioli Model | Version | Stages | T2max | Our Equivalent |
|---|---|---|---|---|
| 306L1 | Inline, 1-stage | 1 | ~12,000 N·m | 306-L1 |
| 306L2 | Inline, 2-stage | 2 | ~12,000 N·m | 306-L2 |
| 306L3 | Inline, 3-stage | 3 | ~12,000 N·m | 306-L3 |
| 306L4 | Inline, 4-stage | 4 | ~12,000 N·m | 306-L4 |
| 306R2 | Right-angle, 2-stage | 2 (bevel + planetary) | ~12,000 N·m | 306-R2 |
| 306R3 | Right-angle, 3-stage | 3 (bevel + 2 planetary) | ~12,000 N·m | 306-R3 |
| 306R4 | Right-angle, 4-stage | 4 (bevel + 3 planetary) | ~12,000 N·m | 306-R4 |
Standard Output Shaft Suffix Codes — All 306 Variants
| Bonfiglioli Suffix | Output Shaft Type | Mounting | Available in Our 306 Series |
|---|---|---|---|
| NHC / HC | Heavy-duty flanged output — keyed shaft | Flange | ✓ Yes |
| NHZ / HZ | Heavy-duty splined male shaft | Flange | ✓ Yes |
| NPC / PC | Foot base — keyed shaft | Foot | ✓ Yes |
| FZ / FZB | Hollow splined shaft | Flange | ✓ Yes |
| FP | Hollow shaft for shrink disc | Flange | ✓ Yes |
306 Series in Context — Bonfiglioli 300 Series Frame Size Ladder: The 306 is frame size 06 of 20 in the Bonfiglioli 300 Series (305 → 306 → 307). The adjacent sizes — 305 (T2max ~7,000 N·m) and 307 (T2max ~18,000 N·m) — are available from our range as the 305 Series and 307 Series respectively. The 306 sits in the mid-range of the 300 Series and is one of the most frequently specified and stocked frame sizes due to its wide application coverage. Always confirm the exact frame size number from the gearbox nameplate before ordering.
② Brevini Riduttori (Dana) — Equivalent Models (~10,000–15,000 N·m Class)
The Brevini EM and ED inline series in the 10,000–15,000 N·m torque band are confirmed cross-references for the 306 Series:
| Brevini Model | Series | Rated Torque | Stages | Typical Application |
|---|---|---|---|---|
| EM1065 | EM Series | ~10,000 N·m | 1 stage | Light industrial, agitator |
| EM1090 | EM Series | ~13,000 N·m | 1 stage | Conveyor, mixer drive |
| ED2065 | ED Series | ~10,000 N·m | 2 stage | Industrial conveyor, hoist |
| ED2090 | ED Series | ~14,000 N·m | 2 stage | Packaging, auger drive |
| ET3065 | ET Series | ~10,000 N·m | 3 stage | High-ratio conveyor drive |
| EC3065 / EC4065 | EC Series | ~10,000 N·m | 3–4 stage | Conveyor with integrated brake |
③ Dinamic Oil — RE / GB Series (~10,000–15,000 N·m Class)
Dinamic Oil RE series inline planetary gearboxes in the 10,000–15,000 N·m torque band are cross-referenced to the 306 Series:
| Dinamic Oil Model | Rated Torque (N·m) | Typical Application |
|---|---|---|
| RE810 | ~8,100 | Light conveyor, agitator drive |
| RE1020 | ~10,200 | Industrial conveyor, hoist |
| RE1520 | ~15,200 | Medium-duty conveyor, mixer |
④ Reggiana Riduttori & Comer Industries — Equivalent Series
Reggiana Riduttori (RR / RA series) and Comer Industries (PG / PGA series) inline planetary gearboxes in the equivalent torque class are covered by the 306 Series cross-reference database:
| OEM Brand | Series | Torque Class (N·m) | Typical Application |
|---|---|---|---|
| Reggiana Riduttori | RR / RA (10K–15K class) | 10,000 – 15,000 | Industrial conveyor, rotary table |
| Comer Industries | PG / PGA / PGR (10K–15K class) | 8,000 – 15,000 | Agricultural machinery, conveyor |
⑤ Additional OEM Cross-References — Same Torque Class
Beyond the primary brand families above, the 306 Series covers the following OEM inline planetary models in the ~10,000–15,000 N·m range. Submit any model number and we confirm within 48 hours:
| OEM Brand | Series / Models | Torque Class | Typical Application |
|---|---|---|---|
| Bosch Rexroth | GFT4 / GFT7 / GFT9 / GFT17 Inline | 4,000 – 17,000 N·m | Hydraulic motor, industrial drive |
| Rossi | R2E / R3E (10K–15K class) | 10,000 – 15,000 N·m | Italian industrial plant, conveyor |
| Zollern | ZHP3.13 / ZHP3.15 | ~10,000 – 15,000 N·m | Crane travel, industrial drive |
| Omni Gear | RC / SD Series (10K–15K class) | 8,000 – 15,000 N·m | Agricultural and light industrial |
| Fairfield Manufacturing | W Series (10K–15K class) | 10,000 – 15,000 N·m | Industrial hoist, marine drive |
Free 48-Hour OEM Cross-Reference Service: Send us the OEM brand, model number (e.g., Bonfiglioli 306L3 HC, Brevini ED2065, or Dinamic Oil RE1020), gear ratio, and motor flange type from the gearbox nameplate. Our engineering team confirms the 306 Series equivalent with a dimensional drawing and delivery timeline within 48 hours — at no charge.
306 Series Inline Planetary Gearbox — Technical Specifications
Standard engineering parameters for the 306 Series, aligned with the Bonfiglioli 306 and equivalent OEM specifications.
| Parameter | Specification | Notes |
|---|---|---|
| T2max (Peak Torque) | ~12,000 N·m (106,000 in·lbs) | Matches Bonfiglioli 306 T2max specification |
| Transmissible Power | Up to 540 kW | Matches Bonfiglioli 300 Series power ceiling |
| Gear Ratio Range | 3.4:1 – 9,000:1 | 1 to 4 inline stages; right-angle 2–4 stages |
| Gear Unit Versions | Inline (L) / Right-angle (R) with spiral bevel first stage | Matching Bonfiglioli 306L and 306R configurations |
| Output Configurations | Flanged keyed shaft / Splined shaft / Foot keyed / Hollow splined / Hollow with shrink disc | All Bonfiglioli 306 suffix codes reproduced |
| Input Configurations | Flanged axial-piston motor / Orbit motor / IEC B5 / NEMA / Solid input shaft | Custom adaptor plates for non-standard motors |
| Brake Options | Hydraulic-released parking brake / DC electric brake / AC electric brake | Rated to hold full nominal output torque at any ratio |
| Transmission Efficiency | 96% – 98% per stage | Rolling-contact planetary; consistent with OEM spec |
| Gear Material | 20CrMnTi / 18CrNiMo7-6 Alloy Steel | Carburised, 58–62 HRC; profile-ground DIN/ISO Class 6 |
| Housing Material | Ductile Iron GGG-50 | Machined to Bonfiglioli 306 reference dimensions |
| Sealing / IP Rating | IP65 standard / IP67 optional | Double-lip shaft seals; cassette seals for washdown duty |
| Lubrication | Mineral or Synthetic ISO VG 220/320 gear oil | Vent, level, and drain plug positions match OEM |
| Operating Temperature | -30°C to +100°C | Extended range options available |
| Surface Treatment | Epoxy primer + two-component PU topcoat | Salt spray >500 hours per ISO 9227 |
| Design Life (B10) | 3,000+ hours at rated load | Per ISO 281 bearing life and AGMA 2001 gear durability |
| Certification | ISO 9001:2015, CE Declaration of Conformity | FAT report supplied with every unit |
| Lead Time | 5 – 15 days (standard) / 25 – 50 days (custom ratio) | 306L2 / 306L3 / 306L4 common ratios in stock |
Core Advantages
Eight engineering and commercial reasons to specify our 306 Series as the Bonfiglioli 306 replacement:
● Verified Dimensional Match
Every 306 Series cross-reference is verified against Bonfiglioli 306 OEM installation drawings — housing bolt pattern, output shaft diameter and keyway, and motor flange pilot diameter — before confirmation. No assumptions from torque data alone.
● All 7 Standard Variants Covered
306L1, 306L2, 306L3, 306L4 (inline, 1 to 4 stages) and 306R2, 306R3, 306R4 (right-angle with bevel input) — all standard reduction stage counts and all output shaft suffix types are available from our confirmed production range.
● T2max ~12,000 N·m — Matched to OEM
The 306 Series is rated to the Bonfiglioli 306 T2max of ~12,000 N·m (106,000 in·lbs) — ensuring the replacement unit meets the same peak torque capability as the original without upsizing to the 307 frame or downsizing to the 305 frame.
● Profile-Ground Gear Sets
All sun gears, planet gears, and ring gears are carburised, hardened to 58–62 HRC, and profile-ground to DIN/ISO Class 6 — matching the Bonfiglioli 300 Series production quality standard throughout.
● 96–98% Per-Stage Efficiency
Rolling-contact planetary gearing delivers 96–98% efficiency per reduction stage — consistent with the original Bonfiglioli 306 specification and significantly better than worm-gear alternatives in the same torque class.
● Full Brake Integration
Hydraulically-released parking brake, DC electric brake, and AC electric brake are all available as factory-integrated options — matching every Bonfiglioli 306 brake configuration and meeting the load-holding requirements for hoist, crane, and inclined conveyor applications.
● Fastest Lead Times in the Range
The 306 is one of the highest-volume frame sizes in our production range. 306L2, 306L3, and 306L4 in the most common gear ratios (10:1 to 500:1) are held in complete sub-assembly stock, allowing final assembly and factory acceptance test completion within 5–15 days — faster than any other frame size in the 300 Series range.
● 100% Factory Acceptance Test
Every unit is run at rated torque and speed for a minimum of two hours on our loaded test benches. Oil temperature, housing temperature, vibration, and seal integrity are all measured and reported. A complete test report is supplied with every shipment.
How the 306 Series Inline Planetary Gearbox Works
The 306 Series uses the same coaxial multi-stage planetary gear architecture as the Bonfiglioli 306 it replaces. Five steps describe the complete power flow:
Motor Input
The electric or hydraulic motor drives the first-stage sun gear at rated input speed. The input flange matches the motor standard exactly — IEC B5, SAE, or NEMA — eliminating adaptor plates in direct replacement installations where the original motor is retained.
Planet Gear Load Sharing
Three or more planet gears mesh simultaneously with the sun gear and the fixed ring gear. Each planet carries a proportional share of total torque — enabling the compact 306 housing to transmit up to 12,000 N·m peak torque reliably across the full gear ratio range.
First-Stage Reduction
The planet carrier outputs at reduced speed and amplified torque, fully coaxial with the motor input. Speed drops and torque increases in direct proportion to the stage ratio — the defining feature of an inline planetary gearbox.
Additional Stages
For high ratios — 100:1 to 9,000:1 as required in agricultural auger drives, conveyor head-pulley drives, and irrigation pump drives — the 306 Series adds up to three additional reduction stages, each multiplying torque while adding only modest axial length.
Coaxial Output
The final-stage carrier drives the output shaft or flange through exactly the same interface geometry as the Bonfiglioli 306 it replaces — keyed shaft, splined shaft, hollow splined shaft, or hollow shaft with shrink disc — enabling a direct bolt-in installation with no modification to the driven equipment.
306 Series Application Scenarios
The Bonfiglioli 306 is among the most versatile frame sizes in the 300 Series, covering the widest range of medium-duty applications. Our 306 Series covers the same sectors with confirmed dimensional and performance equivalence:
Industrial Conveyor & Hoist Drives
Belt conveyors, chain conveyors, bucket elevators, and overhead hoist units in the 50–200 kW power class. The 306L2 and 306L3 are among the most common specifications for conveyor tail and head pulley drives. With integrated brake option, the 306 Series meets the load-holding requirements of EN 14492-2 for hoist applications.
Agricultural Machinery
TMR feed mixer drives, grain auger drives, straw chopper drives, and precision seeder drives. The 306 Series' wide ratio range (3.4:1 to 9,000:1) and compatibility with electric and hydraulic motor input flanges make it the standard specification for Bonfiglioli 306 replacements in agricultural machinery — particularly where high gear ratio and compact housing are both required.
Packaging & Food Processing
Packaging line conveyor drives, filling machine drive units, and food processing mixer and agitator drives. The 306 Series IP65 and IP67 sealing options make it suitable for washdown-duty food processing environments, and the hollow shaft with shrink disc output enables direct shaft mounting without coupling.
Construction Machinery Auxiliary Drives
Concrete pump truck auxiliary drives, cement mixer drives, and construction site conveyor drives. The 306 Series with hydraulic orbit motor input — SAE A through SAE C flanges — is a direct replacement for Bonfiglioli 306 units in mobile construction equipment, providing the same operating torque in a confirmed bolt-in package.
Irrigation & Water Management
Centre-pivot and linear irrigation machine drive units, pump station drives, and water treatment plant mixer drives. The 306 Series' combination of high gear ratio, compact housing, and IP65/IP67 sealing makes it the standard choice for outdoor continuous-duty irrigation applications where the existing Bonfiglioli 306 unit needs replacement.
Renewable Energy & Environmental
Small wind turbine yaw and pitch drives, solar tracker azimuth drives, biogas plant agitator drives, and composting drum drives. The 306 Series' high efficiency (96–98% per stage), wide ratio range, and compact modular housing make it well-suited to the long continuous-duty cycles of renewable energy and environmental plant equipment.
306 Series — Frequently Asked Questions
Common questions from maintenance engineers and procurement teams sourcing Bonfiglioli 306 Series replacements:
Q 01
Is the 306 Series a confirmed bolt-on replacement for the Bonfiglioli 306L2, 306L3, and 306L4?
Yes. Our 306 Series models are dimensionally verified against Bonfiglioli 306 OEM installation drawings — covering all configurations from 306L1 through 306L4 and 306R2 through 306R4. Housing bolt pattern, output shaft diameter and keyway dimensions, and motor flange pilot diameter are all confirmed before a cross-reference is issued. Provide the complete Bonfiglioli model number including the reduction stage suffix (L1 through L4) and output shaft suffix (e.g., HC, FP, NPC, FZ) and we return a confirmed dimensional match within 48 hours.
Q 02
What is the T2max of the Bonfiglioli 306 and how does the 306 Series replacement compare?
The Bonfiglioli 306 has a published T2max of 106,000 in·lbs, which converts to approximately 11,977 N·m (~12,000 N·m). Our 306 Series replacement is rated to the same T2max — ensuring it can withstand the same maximum peak torque as the original without exceeding its structural limits. This is the critical parameter for hoist and crane applications where momentary peak loads must not exceed the gearbox's maximum rated torque.
Q 03
How does the 306 Series relate to the Bonfiglioli 305 and 307 in the frame size ladder?
In the Bonfiglioli 300 Series, the 306 sits between the 305 (T2max ~7,000 N·m) and the 307 (T2max ~18,000 N·m). The three frame sizes are dimensionally distinct and cannot be interchanged. The 306 is among the most common frame sizes — its torque class of ~12,000 N·m covers a very wide range of medium-duty industrial and agricultural applications. Always confirm the exact frame size from the nameplate before ordering; we confirm the correct series from nameplate data within 48 hours.
Q 04
Can the 306 Series also replace Brevini EM1065, EM1090, ED2065, and ED2090?
Yes, with confirmed dimensional cross-reference. The Brevini EM1065, EM1090, ED2065, and ED2090 inline planetary models are in the same torque class as the Bonfiglioli 306 (~10,000–14,000 N·m), and our 306 Series cross-reference database covers these models. Provide the Brevini model number including the ratio code and we return a dimensional comparison with our 306 Series equivalent and confirm whether the housing interfaces are directly interchangeable.
Q 05
What motor interface options are available for the 306 Series?
The 306 Series supports the full range of standard motor input configurations as factory options: IEC B5 flanges (frame 80 through 355) for electric motors, SAE A / B / C / D hydraulic motor flanges for orbit and axial-piston hydraulic motors, NEMA C-face flanges for North American applications, and solid input shaft for belt or chain drives. Custom adaptor plates are available for non-standard motor frames. For high-torque hydraulic applications — construction machinery, irrigation pump stations, and marine auxiliary drives — the SAE C and D flange orbit and axial-piston motor configurations are the most common specification. Specify the motor make, displacement, and flange code when ordering and we confirm the correct input interface.
Q 06
Why is the 306 one of the most commonly stocked replacement gearboxes?
The Bonfiglioli 306 frame size covers a torque class of approximately 8,000–12,000 N·m continuous rated torque, which aligns with the power range of the most widely used electric motor sizes (11 kW to 37 kW) in industrial and agricultural equipment. This torque class is specified in more different types of machinery than any other single frame size in the 300 Series — conveyors, hoists, agricultural drives, packaging equipment, and irrigation systems all commonly land in this range. As a result, the 306L2, 306L3, and 306L4 are among the highest-volume models in our production programme and are held in partial-build stock for the fastest available delivery.
Q 07
What quality documentation is supplied with each 306 Series unit?
Every unit is supplied with: (1) full factory acceptance test report — minimum 2-hour loaded run at rated torque and speed, recording oil temperature, housing surface temperature, vibration, noise, and seal integrity; (2) EN 10204 3.1 material test certificates for all alloy steel forgings; (3) heat treatment batch records; (4) gear tooth profile and lead measurement records; (5) CE Declaration of Conformity; (6) installation and maintenance manual in English. All documentation is included in the standard delivery package at no additional charge.
Quality Assurance
- ✓ ISO 9001:2015 Certified Production — all manufacturing processes from raw material incoming inspection to final assembly and test are controlled under our certified QMS.
- ✓ 100% Loaded Factory Acceptance Test — every unit run at rated torque and speed for minimum 2 hours; oil temperature, vibration, noise, and seal integrity recorded; full test report supplied with every unit.
- ✓ Profile-Ground Gear Inspection — all gears measured on CNC gear measuring machines; gear tooth profile and lead records supplied with every unit.
- ✓ EN 10204 3.1 Material Certificates — alloy steel forgings with mill certificates; heat treatment batch records maintained for 10 years.
- ✓ Verified Dimensional Cross-Reference — all OEM replacement cross-references verified against Bonfiglioli 306 installation drawings before confirmation to the customer.
- ✓ CE Declaration of Conformity — supplied with all units; BV, ABS, and Lloyd's certification available for marine and offshore projects on request.
How to Order a 306 Series Replacement
Read the Nameplate
Record OEM brand, frame size, full model number (e.g., 306L3 HC or 306R2 FP), gear ratio, and motor flange code from the gearbox nameplate or maintenance manual.
Submit Cross-Reference
Send nameplate data to our engineering team. We verify dimensional match against Bonfiglioli 306 OEM drawings and confirm the 306 Series equivalent within 48 hours.
Confirm Options
Specify brake type (hydraulic / DC / AC / none), output shaft type, input flange standard (IEC / SAE / NEMA), and IP rating (IP65 or IP67).
Receive Quotation
Firm quotation with lead time, dimensional drawing for installation verification, and CE documentation reference supplied within 48 hours of confirmed cross-reference.
Tested & Shipped
Every unit fully assembled and FAT-tested at rated torque before shipment. Test report, material certificates, and CE documentation included in the delivery package.
Related Products — Compatible Drive Components
Compatible Motors for the 306 Series
The 306 Series is engineered for direct motor attachment across all standard IEC, SAE, and NEMA input flanges — no coupling adaptor required for the most common motor configurations. Our matched motor range covers the complete input power and speed envelope of the 306 Series, from IEC electric motors for industrial conveyor and hoist drives to high-flow hydraulic orbit and axial-piston motors for construction machinery and agricultural equipment — all factory-paired and tested as a complete drive assembly before shipment.
Frame 80 to 355, IE3 / IE4 efficiency class, 0.75 kW to 315 kW — direct IEC B5 flange mount to all 306 Series inline inputs. Optional integrated DC or AC electromagnetic brake for static load holding on hoist and inclined conveyor drives.
SAE A / B / C flange — high torque at low speed, compact and reliable for agricultural machinery, irrigation drives, and construction auxiliary applications. Direct SAE flange mount to all 306 Series hydraulic input configurations with no adaptor plate required.
SAE B / C / D flange — displacement 28 to 500 cc/rev, continuous pressure 350–450 bar. For high-power hydraulic applications: construction crane auxiliary drives, heavy irrigation pump stations, and marine deck equipment where the 306 Series' 12,000 N·m torque rating is required with hydraulic input.
Ready to Replace Your Bonfiglioli 306 or Equivalent Gearbox?
Whether you need a confirmed replacement for a Bonfiglioli 306L1, 306L2, 306L3, 306L4, 306R2, 306R3, or 306R4 — or an equivalent for a Brevini EM / ED, Dinamic Oil RE, Reggiana Riduttori RR, Comer PG / PGA, or other brand model in the same ~12,000 N·m torque class — our engineering team will confirm the 306 Series model, issue a dimensional drawing, and provide a firm quotation within 48 hours.
