307 Series Planetary Gearbox

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.

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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.

307 Series Planetary Gearbox

Planetary Gearbox Specifications

ParameterValue
Series307 Series (307L1 / 307L2 / 307L3 / 307L4 / 307R2 / 307R3 / 307R4)
Rated Output Torque12,500 Nm
Max. Transmissible PowerUp to 540 kW
Gear Ratio Range3.4 – 9,000
Stage VariantsL1 (1-stage), L2 (2-stage), L3 (3-stage), L4 (4-stage), R2 / R3 / R4 (with ring-output)
Gear Unit ConfigurationInline
Output MountingFoot & flange mounted
Output Shaft OptionsSolid with key / Splined solid / Splined hollow / Hollow with shrink disc
Input ConfigurationsFlanged axial-piston hydraulic motor · Orbit motor · IEC & NEMA adaptors · Solid shaft
Brake OptionsHydraulically released parking brake · DC electric brake · AC electric brake
Bonfiglioli Cross-Reference307L1 · 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.

SeriesModelsTorque (Nm)
300L300L1–300L41,000
301L301L1–301L41,750
303L303L1–303L42,500
305L305L1–305L45,000
306L306L1–306L48,500
307L ★307L1–307L4 / 307R2–307R412,500
309L309L1–309L418,000
310L310L1–310L425,000
311L311L1–311L440,000
313L313L1–313L455,000
315L315L1–315L4100,000
316L316L1–316L4135,000
317L317L1–317L4170,000
318L318L1–318L4250,000
319L319L1–319L4350,000
321L321L1–321L4500,000

Key Features of the 307 Series Planetary Gear Reducer

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    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.
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    Direct replacement for Bonfiglioli 307L1–307R4 — same bolt-circle, same shaft dimensions. No adapter plates, no custom machining required.
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    Four output shaft configurations — solid keyed, splined solid, splined hollow, and hollow with shrink disc cover most OEM interface requirements.
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    Universal input interface — accepts IEC/NEMA flanged electric motors, flanged axial-piston hydraulic motors, orbit motors, or a plain solid shaft.
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    Integrated brake options — hydraulically released parking brake for mobile machines; DC or AC electric brake for fixed-plant and automated lines.
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    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

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.

ComponentRecommended SpecRole in System
Electric MotorIE3 / 75–110 kW, 4-pole, IEC B5 flangePrime mover — flanges directly to 307L input adaptor
307L3 Planetary Gearbox12,500 Nm · Ratio 100–200:1 · Solid-keyed outputSpeed reduction and torque multiplication
Winch DrumØ 320 mm × 600 mm, 8 mm wire rope, 12-tonne SWLConverts rotary output to linear cable pull
Drive SprocketANSI #100 chain, 17T, bored to suit splined outputSecondary chain stage to driven shaft
PTO Drive ShaftSeries 6 cross-joint, 1-3/4″ 20-spline, 1,000 RPMTransmits power to remote implement from gearbox output
Hydraulic Brake ValveCounterbalance valve, 350 bar, G 3/4″ portsWorks with built-in parking brake for load holding
Coupling / JawElastomeric jaw coupling, 12,000 Nm, 95 Shore AAbsorbs 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

Q1: Is this a genuine Bonfiglioli 307 replacement for Bonfiglioli 307L1 and 307R4?
Yes. The 307 Series planetary gearbox is engineered to match the bolt patterns, shaft diameters, and output torque rating of the Bonfiglioli 307L1–307R4 range. It is an OEM-compatible aftermarket unit, not a Bonfiglioli-branded product.
Q2: What lubricant does the 307 Series industrial planetary gearbox require?
ISO VG 220 or VG 320 mineral gear oil for ambient temperatures of −10 °C to +40 °C. Synthetic PAO is recommended for continuous duty above 40 °C or below −20 °C. Initial fill volume is approximately 4.5 litres for the 307L frame; change interval is 5,000 operating hours or two years, whichever comes first.
Q3: Can the gear ratio of a replacement for Bonfiglioli 307R4 be customised?
Within the 3.4–9,000 range, yes. The L1 through L4 and R2–R4 stage variants cover most ratios. Non-standard ratios outside the catalogue range are available on a minimum-order basis with 6–8 weeks lead time. Provide your input RPM, required output RPM, and peak torque demand.
Q4: What is the typical lead time for the 307 Series Planetary Gear Reducer?
Standard 307L1 and 307L2 variants are held in stock and ship within 3–5 business days. 307L3, 307L4, and all R-type units ship in 10–15 business days. For orders of 5+ units, contact us for a confirmed delivery schedule and volume pricing.
Q5: How do I identify which 307-series variant I currently have installed?
Check the nameplate on the gearbox housing. The model string reads as 307 + stage code (L1–L4 or R2–R4). L = inline output, R = right-angle/ring output; the digit = number of reduction stages. If the nameplate is missing, measure the output shaft diameter and the flange bolt circle, then email us the dimensions — we will identify the variant and confirm availability.

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

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