NORD SK 7307.1 MAXXDRIVE® B Industrial Bevel-Helical Gear Unit
The NORD SK 7307.1 is a heavy-duty, 3-stage right-angle industrial bevel-helical gearbox from NORD DRIVESYSTEMS' flagship MAXXDRIVE® B Series[cite: 21]. Engineered with NORD's single-piece UNICASE cast iron block housing[cite: 21], the SK 7307.1 delivers exceptional thermal dissipation capacity, extreme radial and axial load tolerance, and a nominal output torque capacity of 48,000 Nm[cite: 21]. Covering 11 frame sizes from SK 5307.1 to SK 11407.1 (15,000 Nm to 282,000 Nm)[cite: 21], MAXXDRIVE® B units support solid output shafts (V), hollow shafts with keyway (A) or shrink disc (S), B5 output flanges (F), torque arms (G), swing bases (SB), cooling fans, heat exchangers, mechanical backstops (RLS), and auxiliary maintenance drives[cite: 21]. They are extensively specified across bucket elevators, apron feeders, heavy belt conveyors, agitators, ball mills, crushers, and port machinery[cite: 21].
Technical Specifications
| Model / Part Number | SK 7307.1 (3-Stage Bevel-Helical, Size 7 Industrial Unit)[cite: 21] |
|---|---|
| Brand / Manufacturer | Getriebebau NORD GmbH & Co. KG[cite: 21] |
| Housing Construction | UNICASE Single-Piece Heavy Cast Iron Housing (GJL-200 / GJS-400)[cite: 21] |
| Nominal Torque Capacity | 48,000 Nm (SK 7307.1) / 15,000 Nm to 282,000 Nm (Full Series Range)[cite: 21] |
| Motor Input Options | IEC B5 Motor Adapters (132 to 355), NEMA C-Face Adapters, Free Input Shafts (W)[cite: 21] |
| Ratio Range (i) | 3-Stage: 12.50 to 90.00 | 4-Stage: 80.00 to 500.00+[cite: 21] |
| Shaft & Mounting Executions | Solid Shaft (V), Hollow Shaft Keyway (A) / Shrink Disc (S), Flange B5 (F), Torque Arm (G), Swing Base (SB)[cite: 21] |
Documentation & Resources
NORD MAXXDRIVE® B Series Modular Architecture Matrix
Complete structural layout guide for NORD DRIVESYSTEMS MAXXDRIVE® B right-angle industrial gearboxes[cite: 21]. Review reduction stages, shaft options, mounting configurations, and auxiliary thermal accessories:
| Gear Unit Series & Reduction Stages | Frame Sizes Covered | Nominal Torque Output (kNm) | Standard Factory Accessories & Packages |
|---|---|---|---|
| MAXXDRIVE® B 3-Stage Bevel-Helical[cite: 21] | SK 5307.1 to SK 11307.1 (7 Sizes)[cite: 21] | 15.0 kNm - 282.0 kNm[cite: 21] | /Fan-Rad (Radial Cooling Fan) |
| MAXXDRIVE® B 4-Stage Bevel-Helical[cite: 21] | SK 5407.1 to SK 11407.1 (7 Sizes)[cite: 21] | 15.0 kNm - 282.0 kNm[cite: 21] | /Cool-W (Water/Oil Heat Exchanger) |
| Hollow Shaft Shrink Disc (S/SH)[cite: 21] | Sizes 5 to 11 (All Frame Sizes)[cite: 21] | 15.0 kNm - 282.0 kNm[cite: 21] | /RLS (Mechanical Backstop) |
| Swing Base Assemblies (SB)[cite: 21] | Sizes 5 to 11 (Complete Drive Packages)[cite: 21] | 15.0 kNm - 282.0 kNm[cite: 21] | /AUX (Inching / Maintenance Drive) |
| Pressure Lubrication Systems (Pump)[cite: 21] | Sizes 5 to 11 (For Heavy Thermal Duty)[cite: 21] | 15.0 kNm - 282.0 kNm[cite: 21] | /Fl-Filtr (Oil Filter & Heater) |
Legacy Industrial Gearbox Replacement & MAXXDRIVE® B Upgrade Guide
Obsolete heavy industrial gearboxes installed on cement, mining, and bulk handling systems can be directly replaced with current MAXXDRIVE® B Series bevel-helical units[cite: 21]. Refer to the cross-reference mapping below for 1-to-1 retrofitting:
| Legacy Industrial Gearbox Code | Original Gearbox Type | Current MAXXDRIVE® B Equivalent | MAXXDRIVE Torque Rating | Mechanical Fit & Retrofit Engineering Notes |
|---|---|---|---|---|
| SK 5000 / SK 5207.1 Bevel[cite: 21] | 1st Gen Industrial Bevel[cite: 21] | SK 5307.1 / SK 5407.1 MAXXDRIVE B[cite: 21] | 15,000 Nm[cite: 21] | Direct shaft height & footprint match. Upgraded thermal capacity[cite: 21]. |
| SK 6000 / SK 6207.1 Bevel[cite: 21] | 1st Gen Industrial Bevel[cite: 21] | SK 6307.1 / SK 6407.1 MAXXDRIVE B[cite: 21] | 24,000 Nm[cite: 21] | Identical shaft diameter & keyway specs. Drop-in replacement[cite: 21]. |
| SK 7000 / SK 7207.1 Bevel[cite: 21] | 1st Gen Industrial Bevel[cite: 21] | SK 7307.1 / SK 7407.1 MAXXDRIVE B[cite: 21] | 48,000 Nm[cite: 21] | Direct replacement for heavy conveyor & bucket elevator drives[cite: 21]. |
| SK 8000 / SK 8207.1 Bevel[cite: 21] | 1st Gen Industrial Bevel[cite: 21] | SK 8307.1 / SK 8407.1 MAXXDRIVE B[cite: 21] | 75,000 Nm[cite: 21] | Preserves base mounting bolt pattern. Accepts IEC/NEMA adapters[cite: 21]. |
| SK 9000 to SK 11000 Series[cite: 21] | 1st Gen Ultra Heavy Bevel[cite: 21] | SK 9307.1 to SK 11407.1 MAXXDRIVE B[cite: 21] | 112,000 - 282,000 Nm[cite: 21] | Modular swing base & cooling packages ensure 1-to-1 retrofit[cite: 21]. |
Expert Selection & Retrofit Engineering Notes
When retrofitting an existing application featuring older SK 5207.1, SK 7207.1, or competitor industrial gearboxes[cite: 21], upgrading to MAXXDRIVE® B UNICASE block housing gear units ensures complete dimensional compatibility while offering significantly higher thermal ratings and lower maintenance down-time. Simply supply us with your existing NORD serial number or nameplate data, and our engineering team will provide a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- SK 5307.1V-IEC180 (15 kNm)[cite: 21]
- SK 6307.1V-IEC200 (24 kNm)[cite: 21]
- SK 7307.1V-IEC280 (48 kNm)[cite: 21]
- SK 8307.1V-IEC315 (75 kNm)[cite: 21]
- SK 9307.1V-IEC315 (112 kNm)[cite: 21]
- SK 10307.1V-IEC355 (175 kNm)[cite: 21]
- SK 11307.1V-IEC400 (282 kNm)[cite: 21]
- SK 5407.1V-IEC132 (15 kNm)[cite: 21]
- SK 7407.1V-IEC200 (48 kNm)[cite: 21]
- SK 9407.1V-IEC250 (112 kNm)[cite: 21]
- SK 5307.1A Hollow Shaft[cite: 21]
- SK 7307.1S Shrink Disc[cite: 21]
- SK 8307.1F Output Flange[cite: 21]
- SK 9307.1G Torque Arm[cite: 21]
- SK 7307.1SB Swing Base[cite: 21]
- SK 8307.1-RLS Backstop[cite: 21]
- SK 5307.1-Fan-Rad Cooling[cite: 21]
- SK 7307.1-Cool-W Water[cite: 21]
- SK 9307.1-AUX Inching[cite: 21]
- SK 10307.1-Pump Lubrication[cite: 21]
