NB300R Series Right Angle Gearbox — Spiral Bevel Planetary Drive,

NB300R Series Right Angle Gearbox — Spiral Bevel Planetary Drive, 1,000–500,000 Nm

NB300R Right Angle Gearbox, 1,000–500,000 Nm, ratios 6.9–9,000, up to 150 kW. Spiral bevel + planetary stages. IEC/NEMA and hydraulic inputs. 16 frame sizes, R2/R3/R4 stages in stock.

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NB300R Series · Spiral Bevel Planetary

NB300R Series Right Angle Gearbox — Spiral Bevel Planetary Drive, 1,000–500,000 Nm

The NB300R Series is a right angle drive gearbox built around a spiral bevel input stage combined with multi-stage planetary reduction. The result is a compact unit that redirects drive by 90° while delivering output torques from 1,000 Nm (NB300R) up to 500,000 Nm (NB321R) — all within the same bolt-circle family. With up to 150 kW of transmissible mechanical power and gear ratios spanning 6.9 to 9,000, this agricultural right angle gearbox line covers fixed industrial plant, heavy mobile machinery, and high-cycle automated drives without needing an external bevel stage. Modular input configurations — IEC/NEMA flanges, axial-piston hydraulic motors, orbit motors, and solid shafts — mean it integrates directly into existing drivetrains.

NB300R Series Right Angle Gearbox — Spiral Bevel Planetary Drive,

150 kW

Max Power

500,000 Nm

Peak Torque

6.9–9,000

Gear Ratio Range

16 Sizes

NB300R → NB321R

Right Angle Gearbox Technical Specifications

ParameterValue
Series DesignationNB300R through NB321R (16 frame sizes)
Gear Unit ConfigurationRight angle — spiral bevel input + planetary reduction stages
Output Torque Range1,000 Nm (NB300R) to 500,000 Nm (NB321R)
Transmissible PowerUp to 150 kW
Gear Ratio Range6.9 – 9,000
Stage VariantsR2 (2-stage) · R3 (3-stage) · R4 (4-stage)
Input ConfigurationsFlanged axial-piston hydraulic motor · Orbit motor · IEC & NEMA adaptors · Solid input shaft
Cross-Reference (NBPG)NB300R, NB301R, NB303R, NB305R, NB306R, NB307R, NB309R–NB321R
Bevel Stage TypeSpiral bevel (low noise, high contact ratio)
InstallationFoot mount · Flange mount · Hollow shaft with shrink disc

NB300R Series Right Angle Drive Gearbox — Full Torque Range

All 16 frame sizes share the same right-angle spiral bevel architecture. Stage count (R2 / R3 / R4) determines the final ratio within each frame.

SeriesModels AvailableRated Torque (Nm)
NB300RNB300R2 · NB300R3 · NB300R41,000
NB301RNB301R2 · NB301R3 · NB301R41,750
NB303RNB303R2 · NB303R3 · NB303R42,500
NB305RNB305R2 · NB305R3 · NB305R45,000
NB306RNB306R2 · NB306R3 · NB306R48,500
NB307RNB307R2 · NB307R3 · NB307R412,500
NB309RNB309R2 · NB309R3 · NB309R418,000
NB310RNB310R2 · NB310R3 · NB310R425,000
NB311RNB311R2 · NB311R3 · NB311R440,000
NB313RNB313R2 · NB313R3 · NB313R455,000
NB315RNB315R3 · NB315R4100,000
NB316RNB316R3 · NB316R4135,000
NB317RNB317R3 · NB317R4170,000
NB318RNB318R4250,000
NB319RNB319R4350,000
NB321RNB321R4500,000

Key Features of the NB300R Heavy Duty Right Angle Gearbox

  • →
    Spiral bevel 90° input stage — higher contact ratio than straight-cut bevel gears, reducing noise by up to 6 dB and increasing tooth strength under shock load in this heavy duty right angle gearbox design.
  • →
    Torque range 1,000 – 500,000 Nm across 16 frames — all sizes share a common mounting philosophy, so moving up or down the range requires no new machine interface design.
  • →
    Gear ratios 6.9 to 9,000 in one product family — R2, R3, and R4 stage variants deliver the exact output RPM without a secondary gearbox, keeping the drivetrain shorter and lighter.
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    Universal input compatibility — IEC B5/B14 and NEMA C-face adaptors, axial-piston hydraulic motors, orbit motors, and plain solid shafts all fit without custom machining.
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    Suitable as a right angle gearbox for lawn mower and compact agricultural drives — the lower frame sizes (NB300R to NB305R, 1,000–5,000 Nm) fit mid-size tractor and mower deck configurations with no adapter plate.
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    Sealed for outdoor and wash-down environments — double-lip seals on input and output shafts; IP65-equivalent protection on the bevel housing prevents ingress during field operation.
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    Reduced total cost of ownership — modular design means worn planet carriers or bevel sets are field-replaceable without scrapping the housing, cutting repair cost by 40–60% vs. competitors with welded or bonded housings.

Applications for the NB300R Agricultural Right Angle Gearbox

Applications for the NB300R Agricultural Right Angle Gearbox

Agricultural Drives

PTO-driven mowers, rotary tillers, spreaders, and fodder mixers. The compact bevel-planetary layout fits inside existing PTO housings with standard 1-3/8″ or 1-3/4″ spline interfaces.

Marine & Winch

Deck winches, anchor drives, and aquaculture feeding systems where a 90° drive change at the drum is required and the unit must resist salt-spray for 10,000+ operating hours.

Construction Equipment

Concrete mixer drums, slewing rings on mini-excavators, and road-planer head drives — all applications where torque peaks to 2× rated value during material break-in.

Industrial Conveyors

Cross-belt sorters, 90° transfer conveyors, and screw feeders where the motor cannot be aligned axially with the output shaft.

Lawn & Turf Machinery

Large-area ride-on mowers and golf-course fairway cutters where a right angle gearbox for lawn mower applications must fit within a 200 mm vertical envelope.

How to Calculate the Gear Ratio of the NB300R Right Angle Gearbox

The NB300R combines a fixed-ratio bevel stage with a variable-stage planetary section. The total ratio is the product of both:

Total ratio (i) = ibevel × iplanetary

iplanetary = 1 + (Zring / Zsun) ← per planetary stage

Multi-stage: itotal planetary = istage1 × istage2 × istage3

Worked example — NB307R3: Bevel ratio 2:1 × three planetary stages of 5:1 each = 2 × 5 × 5 × 5 = 250:1 total. With a 1,450 RPM motor input, output speed = 1,450 ÷ 250 = 5.8 RPM.

Finding the required ratio: Divide your motor RPM by the target output RPM. If you need 3 RPM from a 1,450 RPM motor: 1,450 ÷ 3 ≈ 483:1 — an NB307R3 or NB309R3 in a high-ratio configuration will cover this.

Share your motor speed, required output RPM, and peak torque demand with us and we will confirm the exact model and stage count within 24 hours.

Right Angle Gearbox Repair: Rebuild or Replace?

The modular NB300R design makes targeted repairs practical. Use this decision guide before ordering a full replacement unit:

  • 1.
    Oil leak at input bevel housing: Replace the bevel-shaft lip seal. On the NB300R–NB307R frame, this is a standard 72×100×10 NBR seal. Downtime: 1–3 hours with the unit in-situ.
  • 2.
    Whine or howl under load (no debris in oil): The bevel set is the likely source. Remove and inspect tooth contact pattern — a correct spiral bevel shows a centered ellipse roughly 50% of tooth face width. If the pattern has migrated to the toe or heel, adjust bearing preload before condemning the gears.
  • 3.
    Metal particles or milky oil: Drain immediately. Milky oil means water ingress — replace seals, flush, and refill. Metallic debris above 50 µm particles indicates gear or bearing failure; replace the affected stage as an assembly. Do not continue running.
  • 4.
    Irregular output speed or slipping under rated load: Check the planet carrier pins for fretting. If pins have migrated more than 0.1 mm, the carrier needs replacement. A carrier kit for NB307R runs approximately 15% of a new-unit price.
  • 5.
    Cracked housing or stripped mounting threads: Replace the complete unit. Repairing cast-iron housings by welding changes bore alignment tolerances and voids warranty. The NB300R replacement listed here ships pre-assembled and test-run.

Complete Right Angle Drive System — Recommended Components

The NB300R right angle drive gearbox performs best as part of a matched drivetrain. The components below are selected to interface directly with the NB300R input and output configurations:

ComponentSpecificationInterface with NB300R
Electric MotorIE3, 7.5–110 kW, 4-pole, IEC B5 flangeBolts to IEC adaptor on NB300R input; no intermediate coupling required
Drive SprocketANSI #80–#120 chain, 15–21T, keyed boreMounted on solid keyed output shaft; transfers torque to chain-driven load
Marine Winch DrumØ 280–400 mm, 6–12 mm wire rope, SWL to 10 tCouples to splined hollow output on NB309R–NB313R for aquaculture and dredging winch duty
PTO Drive ShaftSeries 4–6 cross-joint, 1-3/8″ or 1-3/4″ 6-splineFeeds power from tractor PTO into NB300R input shaft on agricultural drives
Elastomeric Jaw Coupling2,000–15,000 Nm, 95 Shore A spiderAbsorbs torsional shock between motor and bevel input; reduces bevel-tooth fatigue

FAQ — NB300R Right Angle Gearbox

Q1: What is the difference between a right angle gearbox and an inline planetary gearbox?
An inline planetary unit keeps input and output on the same axis. A right angle gearbox — like the NB300R — uses a spiral bevel stage to redirect the drive by 90°, allowing the motor to mount perpendicular to the output shaft. This is essential when axial space is limited or when the driven machine axis is fixed.
Q2: Is the NB300R Series a heavy duty right angle gearbox suitable for continuous-duty industrial use?
Yes. The planetary section is rated for S1 (continuous) duty. The spiral bevel stage is rated to 150 kW at the input. For S6 (intermittent) duty cycles, peak torque can reach 1.8× the catalogue value for up to 10 seconds per cycle, provided the mean cyclic torque remains below rated.
Q3: Can I use the NB300R as a right angle gearbox for a lawn mower or compact turf machine?
The NB300R (1,000 Nm) and NB301R (1,750 Nm) are sized for compact mower decks. They accept a 1-3/8″ 6-spline PTO input and deliver solid-keyed output. Confirm the mounting flange dimensions against your mower chassis before ordering — we can supply a dimensioned drawing on request.
Q4: What lubricant does the NB300R right angle drive gearbox require?
ISO VG 220 EP gear oil for the bevel and planetary chambers at ambient temperatures of −10 °C to +40 °C. Above 40 °C or below −20 °C, switch to a PAO-based synthetic. Initial fill is approximately 1.8 L for the NB300R frame. Change interval: 5,000 hours or 2 years. The bevel and planetary chambers share a single oil bath on frames up to NB307R.
Q5: What is the lead time for NB300R Series agricultural right angle gearbox units?
NB300R through NB307R in R2 and R3 stage configurations are held in stock — typical dispatch is 3–5 business days. R4-stage units and frames NB309R and above ship in 10–20 business days. Orders of 5+ units qualify for volume pricing; contact us with your model list and quantities.

Get Pricing & Technical Support

Order the NB300R Right Angle Gearbox — Stock Units Ship in 3–5 Days

Tell us your model number (e.g. NB307R3), required gear ratio, input configuration, and quantity. Our engineering team returns a confirmed quote and dimensional drawing within 24 hours.

Full NB300R–NB321R range in stock · Volume pricing from 5 units · IEC / NEMA / hydraulic input options

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