311 Series Planetary Gearbox | Bonfiglioli 311 Replacement OEM
311 series planetary gearbox, 35,000 Nm. Direct replacement for Bonfiglioli 311L1–L4 & 311R2–R4. Inline & right angle, ratios up to 9,000:1. MOQ 1, fast 24h quote.
311 Series Planetary Gearbox
Direct Replacement for Bonfiglioli 311L1 · 311L2 · 311L3 · 311L4 · 311R2 · 311R3 · 311R4
Inline and right angle planetary gearboxes covering 1,000 – 1,100,000 Nm, ratios from 3.4 to 5,000, and mechanical power up to 450 kW. All installation dimensions are fully interchangeable with Bonfiglioli EM / ED / ET / EL series, Brevini BW winch series, Bonfiglioli wheel drives, and track drives — no modifications required.
✓ 1,000–1,100,000 Nm
✓ 100% Load-Tested
✓ MOQ 1 Unit
Section 01
Product Overview — What Is the 311 Series Planetary Gearbox?
The 311 series planetary gearbox is a high-torque industrial gear unit available in both inline (coaxial) and right angle (spiral bevel output) configurations — designated 311L for inline and 311R for right angle. The 311 frame size sits within the broader 300-series range at 35,000 Nm rated torque and 180 kW rated power, making it one of the most widely deployed sizes in crane, winch, and wheel drive applications.
The suffix indicates the reduction stage count: L1 / R2 = 1 or 2 stages, through to L4 / R4 = 4 stages. More stages extend the achievable gear ratio within the same housing dimensions. The full 311 variant range covers ratios from 4:1 (inline) and 18:1 (right angle) up to 2,200:1 and 800:1 respectively — with worm-combined configurations reaching up to 9,000:1.
This unit replaces Bonfiglioli Trasmital 311L1, 311L2, 311L3, 311L4, 311R2, 311R3, and 311R4 with fully interchangeable mounting dimensions. It is also dimensionally compatible with equivalent units from Brevini (BW winch series, rotary gearbox), Bonfiglioli wheel drives, and track drives. Custom configurations and OEM private labelling are available.
311 Series Planetary Gearbox | Bonfiglioli 311 Replacement OEM
Section 02
Technical Specifications
Dimensional drawings available on request. Confirm your existing variant (L1–L4 / R2–R4) before ordering.
311 Series — General Parameters
| Parameter | Value / Details |
|---|---|
| 311 Frame — Rated Torque | 35,000 Nm |
| Rated Power (311) | 180 kW |
| Full Series Torque Range | 1,000 – 1,100,000 Nm (sizes 300–321) |
| Max Mechanical Power | Up to 450 kW |
| 311 Ratio — Inline (L) | 4 : 1 – 2,200 : 1 |
| 311 Ratio — Right Angle (R) | 18 : 1 – 800 : 1 |
| Worm Combined Ratio | 400 : 1 – 9,000 : 1 |
| Max Input Speed (311) | 2,000 RPM |
| Gear Unit Versions | Inline coaxial (L series) · Right angle spiral bevel (R series) |
| Output Mounting | Base mount & flange mount |
| Output Shaft Options | Keyed solid · Spline · Spline hollow · Hollow with shrink disc |
| Input Configurations | Flanged axial piston hydraulic motor · Hydraulic track motor · IEC motor adaptor · NEMA motor adaptor · Solid input shaft |
| Brake Options | Hydraulic parking brake (on request) · DC electric brake · AC electric brake |
| Equivalent Series | 311L1 · 311L2 · 311L3 · 311L4 · 311R2 · 311R3 · 311R4 |
| Condition & MOQ | New · No minimum order quantity |
Full 300-Series Range — Torque & Ratio Reference
| Model | Rated Torque (Nm) | Rated Power (kW) | Max Input RPM | Ratio (Inline) | Ratio (R. Angle) | Design |
|---|---|---|---|---|---|---|
| 300 | 1,000 | 20 | 3,000 | 3.3–2,700 | 7–800 | A |
| 301 | 1,750 | 30 | 3,000 | 3.3–2,700 | 7–800 | A |
| 303 | 2,500 | 40 | 3,000 | 3.6–2,900 | 9–900 | A |
| 305 | 5,000 | 60 | 3,000 | 3.6–2,900 | 9–900 | A |
| 306 | 8,500 | 75 | 2,500 | 3.7–2,900 | 9–900 | A |
| 307 | 12,500 | 100 | 2,500 | 3.4–2,500 | 13–800 | A |
| 309 | 18,500 | 130 | 2,500 | 3.4–2,500 | 13–800 | B |
| 310 | 25,000 | 150 | 2,000 | 3.8–2,500 | 40–900 | B |
| 311 ✦ | 35,000 | 180 | 2,000 | 4–2,200 | 18–800 | B |
| 313 | 50,000 | 200 | 2,000 | 4–2,200 | 18–800 | B |
| 315 | 80,000 | 250 | 1,500 | 4–2,000 | 70–900 | B |
| 316 | 105,000 | 270 | 1,500 | 4–2,000 | 50–600 | B |
| 317 | 150,000 | 300 | 1,000 | 4–1,900 | 70–900 | B |
| 318 | 200,000 | 340 | 1,000 | 4–1,100 | 200–700 | B |
| 319 | 300,000 | 380 | 500 | 4–1,400 | 300–800 | B |
| 321 | 450,000 | 450 | 500 | 4–1,100 | 300–800 | B |
✦ Primary product on this page. Design A = single housing; Design B = dual housing. Suffix L = inline; R = right angle.
Section 03
Key Features of the 311 Series Planetary Gearbox
The 311 series covers both inline (311L) and right angle (311R) outputs within the same frame size — using the same housing, planet carrier, and ring gear. This reduces the number of unique parts needed in a mixed fleet and simplifies spares inventory.
Inline variants cover 4:1 to 2,200:1. Right angle variants cover 18:1 to 800:1. Combined with a worm stage, the ratio extends to 9,000:1 — all within the same mounting envelope as the original Bonfiglioli 311 series.
Flanged axial piston hydraulic motors, hydraulic track motors, IEC-frame electric motors, NEMA-frame electric motors, and solid input shaft — covering both mobile hydraulic and fixed industrial electric drive systems without custom adaptor engineering.
Spring-applied, hydraulically released parking brake available on request. Engages automatically on power loss — required for crane hoisting, winch holding, and mobile equipment parking on grade. DC and AC electric brake options also available.
Keyed solid, splined, splined hollow, and hollow with shrink disc. Matching the original Bonfiglioli 311 output shaft type eliminates post-installation adaptation work — the primary source of additional cost on replacement projects.
Non-standard input/output combinations, special shaft dimensions, and OEM-specific configurations are built from standard components — keeping lead times within the same window as standard orders and avoiding non-recurring tooling cost.
Section 04
Brand Equivalent Reference Table
The 311 series is fully interchangeable with Bonfiglioli Trasmital and HZPT EP311 designations below. All installation dimensions — bolt pattern, shaft diameter, housing footprint, and port locations — are matched for direct substitution.
| Brand | L1 | L2 | L3 | L4 | R2 | R3 | R4 |
|---|---|---|---|---|---|---|---|
| Bonfiglioli Trasmital | 311L1 | 311L2 | 311L3 | 311L4 | 311R2 | 311R3 | 311R4 |
| Our EP311 Series | EP311L1 | EP311L2 | EP311L3 | EP311L4 | EP311R2 | EP311R3 | EP311R4 |
Beyond Bonfiglioli 311 series, all installation dimensions of our planetary, wheel drive, winch drive, and track drive products are fully interchangeable with the following brands:
Bosch Rexroth
Comer Industries
Reggiana Riduttori
Rossi
Zollern
We do not sell products from these brands; we are only using these brand names for convenience in product selection and it does not involve any infringement.
Section 05
Application Scenarios
The 311 series planetary gearbox at 35,000 Nm rated torque covers the mid-heavy class of crane, winch, and mobile equipment drives — the most commonly replaced frame size in the 300 series range.
Tower crane hoisting winches, derrick boom luffing drives, and mobile crane slewing drives. The hydraulic parking brake option satisfies FEM M5+ crane duty classifications for powered load holding at rest.
Interchangeable with Brevini BW hydraulic winch series. Used in anchor windlass, mooring winch, deck crane winch, and cable laying equipment where a compact, high-torque winch drive with fail-safe braking is specified.
Replaces Bonfiglioli wheel drive and track drive equivalents. Deployed on dump trucks, site dumpers, concrete mixer trucks, and tracked paving equipment. Hydraulic axial piston motor input is standard for mobile equipment.
Rope drum drives, conveyor drives, and longwall face haulage drives. The 311 frame at 35,000 Nm covers the majority of mid-class mining winch and chain conveyor drive requirements.
Deck machinery gear drives where the hydraulic motor input configuration is standard. The right angle (311R) variant positions the motor parallel to the deck structure while delivering output torque perpendicular — reducing deck protrusion height on compact vessels.
311 series planetary gearbox Application Scenarios
Section 06
Frequently Asked Questions
Section 07
Verified Customer Reviews
"Replacing a 311L3 on a tower crane winch — I sent the nameplate data on Monday morning. By Monday afternoon I had a dimensional drawing confirming the fit. Unit arrived in 12 days by air freight. Bolted directly on with no shimming or spacers. Crane inspector had the documentation he needed without us chasing anything. That alone saved half a day."
"My Bonfiglioli 311R3 decided to retire unannounced in the middle of a job site — as one does. I ordered the EP311R3, half-expecting to spend the next week on an international supply chain adventure involving at least three time zones and a forms-in-duplicate situation. Instead: order placed Tuesday, shipped Thursday, on site Monday. No drama. Machine running. I'm filing a complaint about the lack of story material."
Section 08
Why Source the 311 Series from Our Factory
Our factory has manufactured planetary gearboxes for 35+ years. The production line covers CNC precision machining of housings, DIN/AGMA gear hobbing, case hardening and heat treatment, and full assembly under controlled conditions.
No-load run-in and full rated-torque bench test on every unit — not spot-checked, not sampled. Signed test report ships with every order. Units that don't pass the test don't leave the factory.
Certified quality management system covering the full production process — incoming material inspection, machining tolerance control, gear mesh measurement, assembly verification, and outgoing test documentation.
Over 10,000 standard specifications maintained in finished or semi-finished stock. Standard replacement orders for common 311 variants (L1–L4, R2–R4) typically process in 4–7 business days — without waiting for a production run.
Our export team includes English-speaking engineers who handle product selection, cross-reference to competitor part numbers, torque calculations, custom drawings, and after-sales support. From initial RFQ to post-installation questions — one point of contact.
OEM private labelling, custom nameplate specifications, and drawing-based custom configurations are available for equipment manufacturers building their own branded product lines. Minimum quantities and lead times confirmed on enquiry.
Order 311 Series Planetary Gearbox — Response in 24 Hours
Send your existing Bonfiglioli 311 variant (311L1–L4 or 311R2–R4), quantity, and shipping destination. Alternatively, provide your torque, ratio, and motor interface requirements. We'll confirm price, stock status, and lead time within 24 business hours.
✓ Brevini BW / Bonfiglioli EM ED ET EL
✓ MOQ 1 · 100% Load-Tested
✓ Sea / Air / DHL · EXW FOB CIF
📧 [email protected]
| ISO 9001:2015 · CE · RoHS
| Port: Jiangmen, China
| T/T · Western Union · Escrow
Related Searches
311 series planetary gearbox · Bonfiglioli 311L1 311L2 311L3 311L4 replacement · 311R2 311R3 311R4 right angle gearbox · EP311 series planetary gearbox · Bonfiglioli EM ED series replacement · Brevini BW winch gearbox replacement · 311 series planetary gearbox 35000 Nm supplier
추가 정보
| editor | WM |
|---|
