307 Series Planetary Gearbox — 12,500 Nm Inline Industrial Reducer, Replacement for Bonfiglioli 307
307 Series Planetary Gearbox, 12,500 Nm, ratios 3.4–9,000, up to 540 kW. Drop-in replacement for Bonfiglioli 307L1–307R4. IEC/NEMA, hydraulic, and solid-shaft inputs. 7 models in stock.
Drop-In Bonfiglioli 307 Replacement
307 Series Planetary Gearbox — 12,500 Nm Inline Industrial Gear Reducer
The 307 Series is a heavy-duty industrial planetary gearbox rated at 12,500 Nm peak output torque, covering gear ratios from 3.4 to 9,000. Engineered as a direct-mount replacement for Bonfiglioli 307L1, 307L2, 307L3, 307L4, 307R2, 307R3, and 307R4 units, it accepts IEC/NEMA motor flanges, hydraulic piston motors, orbit motors, and solid input shafts without adapter modification. The inline Planetary Gear Reducer architecture keeps the footprint compact while transmitting up to 540 kW — suited for demanding mobile, agricultural, and fixed-plant applications.
Planetary Gearbox Specifications
| Parameter | Value |
|---|---|
| Series | 307 Series (307L1 / 307L2 / 307L3 / 307L4 / 307R2 / 307R3 / 307R4) |
| Rated Output Torque | 12,500 Nm |
| Max. Transmissible Power | Up to 540 kW |
| Gear Ratio Range | 3.4 – 9,000 |
| Stage Variants | L1 (1-stage), L2 (2-stage), L3 (3-stage), L4 (4-stage), R2 / R3 / R4 (with ring-output) |
| Gear Unit Configuration | Inline |
| Output Mounting | Foot & flange mounted |
| Output Shaft Options | Solid with key / Splined solid / Splined hollow / Hollow with shrink disc |
| Input Configurations | Flanged axial-piston hydraulic motor · Orbit motor · IEC & NEMA adaptors · Solid shaft |
| Brake Options | Hydraulically released parking brake · DC electric brake · AC electric brake |
| Bonfiglioli Cross-Reference | 307L1 · 307L2 · 307L3 · 307L4 · 307R2 · 307R3 · 307R4 |
Full 300-Series Torque Range — Where 307 Fits
We stock the complete 300-series line from 1,000 Nm to 500,000 Nm. The table below positions the 307 within the family, so you can upgrade or downgrade without changing your mounting envelope.
| Series | Models | Torque (Nm) |
|---|---|---|
| 300L | 300L1–300L4 | 1,000 |
| 301L | 301L1–301L4 | 1,750 |
| 303L | 303L1–303L4 | 2,500 |
| 305L | 305L1–305L4 | 5,000 |
| 306L | 306L1–306L4 | 8,500 |
| 307L ★ | 307L1–307L4 / 307R2–307R4 | 12,500 |
| 309L | 309L1–309L4 | 18,000 |
| 310L | 310L1–310L4 | 25,000 |
| 311L | 311L1–311L4 | 40,000 |
| 313L | 313L1–313L4 | 55,000 |
| 315L | 315L1–315L4 | 100,000 |
| 316L | 316L1–316L4 | 135,000 |
| 317L | 317L1–317L4 | 170,000 |
| 318L | 318L1–318L4 | 250,000 |
| 319L | 319L1–319L4 | 350,000 |
| 321L | 321L1–321L4 | 500,000 |
Key Features of the 307 Series Planetary Gear Reducer
- →
12,500 Nm rated output torque — handles continuous heavy loads in winch, conveyor, and slewing-drive duty cycles without de-rating. - →
Gear ratios 3.4 to 9,000 in a single housing line — L1 through L4 stage variants let you hit the exact output RPM without a secondary reducer. - →
Direct replacement for Bonfiglioli 307L1–307R4 — same bolt-circle, same shaft dimensions. No adapter plates, no custom machining required. - →
Four output shaft configurations — solid keyed, splined solid, splined hollow, and hollow with shrink disc cover most OEM interface requirements. - →
Universal input interface — accepts IEC/NEMA flanged electric motors, flanged axial-piston hydraulic motors, orbit motors, or a plain solid shaft. - →
Integrated brake options — hydraulically released parking brake for mobile machines; DC or AC electric brake for fixed-plant and automated lines. - →
Up to 540 kW transmissible power — a capacity margin that accommodates shock loads common in agricultural and mining operations.
How to Calculate the Gear Ratio of a Planetary Gearbox
Selecting the right ratio for your 307 Series industrial planetary gearbox starts with one formula. For a standard planetary stage where the ring gear is fixed:
i = 1 + (Zring / Zsun)
i = gear ratio | Zring = number of ring-gear teeth | Zsun = number of sun-gear teeth
Example — 307L single stage: A ring gear with 72 teeth and a sun gear with 24 teeth gives i = 1 + (72 / 24) = 4:1.
Multi-stage units (L2, L3, L4): Multiply the individual stage ratios together. A 307L3 with three stages of 4:1, 5:1, and 7:1 delivers a total ratio of 4 × 5 × 7 = 140:1.
Practical conversion formula: Output speed (RPM) = Input speed (RPM) ÷ i. If your motor runs at 1,450 RPM and you need 10 RPM at the output, the required ratio is 1,450 ÷ 10 = 145:1 — achievable with a 307L3 at the right tooth counts. Contact us with your motor RPM and target output speed; we will confirm the correct stage variant.
Application Areas for the 307 Industrial Planetary Gearbox
Agricultural Machinery
Tractor PTOs, combine drives, and irrigation pump heads requiring compact, high-torque output in dusty, vibration-heavy environments.
Winch & Hoist Systems
Marine deck winches, crane slewing rings, and construction hoists where load-holding under the integrated parking brake is mandatory.
Conveyor & Mixer Drives
Bulk-material conveyors, twin-shaft mixers, and packaging line drives that run 24/7 and need consistent torque without thermal runaway.
Construction & Mining
Drill-head drives, road planers, and tunnelling equipment where impact loads can briefly exceed nominal torque by 2–3×.
Renewable Energy
Solar tracker slewing drives and small-scale wind-turbine pitch-control systems demanding precise, backlash-controlled positioning.
Complete Agricultural Power Drive Solution
The 307 Series planetary gearbox works as the torque hub in a broader drivetrain. Below is a matched power package for a mid-size agricultural or materials-handling application — every component is sourced from our catalogue so you receive a single BOM and one freight shipment.
| Component | Recommended Spec | Role in System |
|---|---|---|
| Electric Motor | IE3 / 75–110 kW, 4-pole, IEC B5 flange | Prime mover — flanges directly to 307L input adaptor |
| 307L3 Planetary Gearbox | 12,500 Nm · Ratio 100–200:1 · Solid-keyed output | Speed reduction and torque multiplication |
| Winch Drum | Ø 320 mm × 600 mm, 8 mm wire rope, 12-tonne SWL | Converts rotary output to linear cable pull |
| Drive Sprocket | ANSI #100 chain, 17T, bored to suit splined output | Secondary chain stage to driven shaft |
| PTO Drive Shaft | Series 6 cross-joint, 1-3/4″ 20-spline, 1,000 RPM | Transmits power to remote implement from gearbox output |
| Hydraulic Brake Valve | Counterbalance valve, 350 bar, G 3/4″ ports | Works with built-in parking brake for load holding |
| Coupling / Jaw | Elastomeric jaw coupling, 12,000 Nm, 95 Shore A | Absorbs shock pulses between motor and gearbox |
★ Custom BOM available on request — specify your motor brand, output shaft interface, and duty cycle and we will configure the matched package.
Planetary Gearbox Repair: When to Rebuild vs. Replace
Not every fault justifies a full replacement. Here is a practical decision framework built around the 307 Series and its Bonfiglioli-equivalent units:
- 1.
Oil leakage at input or output seal: Replace the lip seal (typically Ø 60–120 mm on the 307 frame). Cost is low and the housing remains reusable. Downtime: 2–4 hours. - 2.
Elevated noise / vibration (no metal debris in oil): Drain and inspect. If debris is absent, replace the planet bearings as a set. Rebuild kit with three planet bearings and seals runs typically 8–12% of new-unit cost. - 3.
Metal particles in lubricant: The ring gear or planet gears have started to pit. At 12,500 Nm, running on damaged gears accelerates failure exponentially. Swap to a new or rebuilt unit — the 307 Series replacement listed here ships with all gears already inspected and lapped. - 4.
Parking brake slippage: Recalibrate the hydraulic release pressure first (nominal 20–30 bar). If slippage persists, the friction disc pack is worn — a standard service item available as a separate kit. - 5.
Cracked housing: Replace the unit. Welding a planetary gearbox housing changes bore concentricity and will accelerate bearing failure.
FAQ — 307 Series Planetary Gearbox
Ready to Order or Need a Quote?
Get Your 307 Series Planetary Gearbox — In Stock, Ships in 3–5 Days
Send us your model number (307L1 / 307R2 / etc.), quantity, and target output speed. Our engineering team responds within 24 hours with a confirmed price, lead time, and technical datasheet.
Full 300-series range (300–321) available · OEM cross-reference service · Volume pricing from 5 units
Informations complémentaires
| editor | wm |
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