12 sizes · 4,850 to 110,000Nm · 1 to 4 stages · solid output shaft up to 220mm
The MHD (Mid Heavy Duty) Series is Motovario’s range for heavy industry. Its current product, the PBZ, is built in parallel helical and bevel helical layouts in 12 sizes, with rigid spheroidal cast iron casings, case-hardened gears and a wide range of input, output, cooling and lubrication options.
The PBZ comes in two layouts. Parallel helical units (P1Z to P4Z) have one to four reduction stages, and bevel helical units (B2Z to B4Z) have two to four, for right-angle drives. Twelve sizes, from 139 to 409, cover nominal output torque from 4,850Nm to 110,000Nm at 1400rpm input, with ratios from 1.5:1 up to 431:1.
Casings are EN-GJS400-15 spheroidal cast iron, monobloc up to size 349 and split on sizes 399 and 409 for easier maintenance. Gears are case-hardened 21NiCrMo2 steel, with ground helical gears and Gleason bevel gears. The large oil capacity of the casing adds thermal capacity, and every unit is suitable for horizontal or vertical mounting.
Input is through a bell housing and coupling for an IEC motor (NEMA adaptors available) or a solid input shaft, which can be double-ended. Output options are a keyed solid shaft (standard, from 60mm to 220mm depending on size and gearing), a double-ended solid shaft, a hollow shaft with keyway or shrink disc, or a splined shaft. Cooling fans, cooling coils, heat exchangers and lubrication units are available for high thermal loads, and ATEX versions are available.
| Specification | MHD Series (PBZ) |
|---|---|
| Type | Parallel helical and bevel helical gear reducer for mid and heavy duty |
| Gearings | Parallel helical P1Z, P2Z, P3Z, P4Z; bevel helical B2Z, B3Z, B4Z (P1Z and B2Z on sizes 139, 179, 219, 269 and 319) |
| Sizes | 139, 149, 179, 199, 219, 249, 269, 279, 319, 349, 399, 409 |
| Nominal output torque | 4,850 to 110,000Nm (Mn2 at 1400rpm input) |
| Peak torque | Up to 1.8 x Mn2 for overloads of up to 10 seconds |
| Ratios | Parallel helical 1.5:1 to 419:1; bevel helical 3:1 to 431:1 |
| Average efficiency | P1Z 0.98; P2Z 0.96; P3Z 0.94; P4Z 0.92; B2Z 0.95; B3Z 0.93; B4Z 0.91 |
| Casing | EN-GJS400-15 spheroidal cast iron; monobloc up to size 349, split on 399 and 409 |
| Gears | Case-hardened 21NiCrMo2 steel; ground helical gears; Gleason bevel gears |
| Input | Bell housing and coupling for IEC motor (NEMA adaptor available); solid input shaft, single or double-ended |
| Output | Keyed solid shaft (standard); double-ended solid shaft; hollow shaft with keyway; hollow shaft with shrink disc; splined hollow or solid shaft |
| Mounting | Universal, horizontal or vertical (B3, B3R, B6, B7, V5, V6); torque arm and output flange available |
| Thermal and lubrication devices | Cooling fan, cooling coil, oil/water and oil/air heat exchangers, lubrication and monitoring unit, bearing lubrication pump, oil expansion tank |
| Lubrication | Oil bath (forced lubrication for V5/V6 with vertical input); supplied without oil unless ordered; mineral, PAO or PG oil |
| Other options | Backstop device, optional seals, output shaft cover |
| Finish | Blue RAL 5010 |
| ATEX | ATEX versions available |
| Manufacture | Formigine and Ubersetto plants, Modena, Italy |
| Size | Nominal torque (Nm) | Solid output shaft (mm) | Casing |
|---|---|---|---|
| 139 | 4,850 | 70 (60 on P1Z) | Monobloc |
| 149 | 5,500 | 80 | Monobloc |
| 179 | 9,000 | 100 | Monobloc |
| 199 | 11,000 | 110 | Monobloc |
| 219 | 19,000 | 120 | Monobloc |
| 249 | 24,000 | 130 | Monobloc |
| 269 | 29,000 | 140 | Monobloc |
| 279 | 36,000 | 160 | Monobloc |
| 319 | 55,000 | 170 | Monobloc |
| 349 | 70,000 | 180 | Monobloc |
| 399 | 90,000 | 200 | Split |
| 409 | 110,000 | 220 | Split |
Source: Motovario TECHNICAL CATALOGUE PBZ / IEC / STD / EN / REV.0 / 2026 (design features, efficiency, range table at 1400rpm input, dimensions) and Motovario PBZ product page. Checked 2 November 2026.
For technical information, brochures and further product details, visit our downloads page.
Mid Heavy Duty. It is Motovario’s family of gear reducers for medium and heavy industry, and the PBZ is its current parallel helical and bevel helical range.
Continuous, critical and arduous duties. Motovario lists heavy duty conveyors and bucket elevators, mills and crushers, mixers, shredders, reciprocating pumps, cooling towers and extruders, with a dedicated PBZ extruder version.
P units are parallel helical, with input and output shafts parallel, in one to four stages. B units are bevel helical, turning the drive through 90 degrees, in two to four stages. The single-stage P1Z and two-stage B2Z cover the lowest ratios, from 1.5:1 and 3:1.
Both. Sizes up to 349 have a rigid monobloc casing; the two largest sizes, 399 and 409, have a split casing for easier maintenance.
The large oil capacity of the casing gives good thermal capacity on its own. Where the thermal load is higher, units can be fitted with a cooling fan, a cooling coil, an oil/water or oil/air heat exchanger, or a lubrication and monitoring unit.
View Motovario MHD Series gearboxes in our shop
Contact
Betech 100pt Ltd
Four Square Buildings, Thomas Street
Heckmondwike, West Yorkshire, WF16 0LS
Telephone: 01924 411921
Email: sales@betech.co.uk
Opening hours: 8:00 to 17:00
