The M3PSF50 industrial gear unit is built to the standard interface dimensions of the size 50 horizontal industrial frame. It is a three-stage, all-helical drive on parallel axes: the motor enters one side, the slow-turning output shaft leaves the other, and the whole torque path runs on case-hardened, ground helical gearing inside a rigid cast-iron housing. This is the layout heavy plants choose when a right-angle gearbox is not required but continuous, high-torque service is - conveyors, crushers and mill drives that run for years without a shutdown.
A Three-Stage Parallel-Shaft Drive for Heavy Duty
Three helical stages give the M3PSF50 a wide ratio band without the sliding loss of a worm stage, so the unit holds its efficiency even at low output speeds. The P-type industrial gear unit family is sized 50 to 90 in the horizontal build, and every frame shares the same design language: horizontally split housing for inspection without full disassembly, generous bearing spans for overhung loads from pulleys and sprockets, and a foot mounting that bolts onto standard industry foundations.
What the M3PSF50 Designation Decodes
| M3 | Industrial gear unit series, three gear stages |
| P | Helical gear unit, parallel-shaft layout (R would be the bevel-helical right-angle build) |
| S | Solid low-speed shaft (H = hollow shaft with key or shrink disc) |
| F | Foot mounting (T = torque arm) |
| 50 | Frame size; horizontal builds run from 50 to 90 |
Read the code left to right and the whole gear unit describes itself. The same system covers vertical builds (a V in the code, sizes 10 to 90), so a plant can standardise on one family for both horizontal and vertical drives.
Duties this industrial gear unit is built for:
- Primary and secondary crushers in mining and aggregate plants
- Overland and pit-head belt conveyor systems
- Ball mills, rod mills and ore grinding circuits
- Cement plant bucket elevators and clinker conveyors
- Steel mill roller tables and slab transfer cars
- Port cranes, ship loaders and stacker-reclaimers
Documentation and Ordering
WGT supplies the M-series catalogue and the outline drawing for this frame as PDF downloads, so interface checks - shaft height, bolt pattern, coupling fit - can be done before any commitment is made. Send the driven machine, the motor power and speed, and the required output speed; the selection is confirmed with a rated-torque check and a written quotation, and units ship factory-tested in an export wooden crate with a one-year warranty.
Selection Example: Overland conveyor head drive
Take a 55 kW motor at 1480 rpm driving an overland conveyor head pulley at 31 rpm. The ratio follows directly: 1480 / 31 = 47.7, so a three-stage build near i=48 is selected. In this case the parallel-shaft layout puts motor and pulley shaft on one line, simplifying the guard. The same three numbers - motor speed, target output speed, required torque - are all you need; our engineers (or the online selector below) cross-check the service factor for your duty cycle.
![gear reducer selection flow chart - ratio and frame size]()
Figure: from motor data to a confirmed gearbox model in four steps.
Common Models in the M3 Series
| Model | Centre distance | Output | Typical duty |
|---|
| M3PSF50 | size 50 | solid shaft, foot | conveyors, feeders |
| M3PSF60 | size 60 | solid shaft, foot | crushers, mixers |
| M3PSF70 | size 70 | solid shaft, foot | ball mills, shredders |
| M3PSF80 | size 80 | solid shaft, foot | kilns, heavy conveyors |
| M3PSF90 | size 90 | solid shaft, foot | mill and kiln drives |
| M3RSF50 | size 50 | solid shaft, foot, right-angle | inclined conveyors, elevators |
| M3RSF60 | size 60 | solid shaft, foot, right-angle | screw classifiers, feeders |
| M3RHF70 | size 70 | hollow shaft, foot, right-angle | agitators, drum drives |
| M3PHT80 | size 80 | hollow shaft, torque arm, parallel | shaft-mounted conveyors |
| M3RHT90 | size 90 | hollow shaft, torque arm, right-angle | heavy shaft-mounted drives |
The table below shows the M3 industrial range: P builds are all-helical on parallel axes, R builds add a bevel input stage for a right-angle drive; S / H describe the low-speed shaft and F / T the mounting.
Application Cases
Stone quarry conveyor
A stone quarry runs reducers on its primary conveyor. Shock loads from oversized rock are absorbed by the case-hardened gears (surface HRC58-62), and after two years of continuous duty the units still run within their original 68 dB noise spec.
Flour mill screw conveyors
A flour mill standardised on gear reducers for its screw conveyor network. One spare-part pool now covers fifteen drives, and the smooth helical input stage keeps noise low in the packing hall.
![industrial gearbox applications - conveyor mixer crusher wastewater]()
Figure: typical industries that use the WGT S-series gear reducers.
Frequently Asked Questions
Can this unit mount on my existing installation without redesign?
Yes - the series is manufactured to the same centre distances, shafts and flange dimensions of the common industry frames, so couplings, guards and foundations stay untouched.
Which lubricating oil should be used?
GB L-CKC220~460 or Shell Omala 220~460 as supplied. Under normal duty the housing is lubricated for life; in hot or continuous-duty environments an oil change after the first 400 hours and then every 4000 hours is recommended.
What warranty and documentation come with the gearbox?
A one-year warranty covers material and workmanship. Each unit ships with a test record (noise, temperature rise, backlash), a dimension drawing and an installation manual.
Get Your Drawing and Quotation within 24 Hours
Ready to size your drive? Not sure which model fits? Try our online WGT Motor & Gearbox Online Selection System to match motor power, ratio and mounting in one minute.
Or simply send your motor data (kW, speed, duty) and driven-machine details through the inquiry button - we reply with a completed datasheet, dimension drawing and factory price the same working day. Looking for a gearbox for belt conveyor? Tell us the duty point and we will confirm the model in writing.
