The M3RHF60 industrial gear unit brings the hollow-output right-angle construction up to size 60, where conveyor and process drives run loaded around the clock. A spiral-bevel input stage turns the motor 90 degrees into two ground helical stages, and the low-speed shaft is bored through so the machine shaft passes straight in - keyed or clamped by a shrink disc. The housing is the familiar horizontally split cast-iron case of the industrial range, sized at this frame for continuous three-shift duty.
Size 60 with a Hollow Bore and a Bevel Input
Two design decisions shape this unit. The first is the right-angle input, which keeps the motor beside the machine instead of in line with it - decisive wherever the drive point sits in a narrow corridor or against a wall. The second is the hollow output, which removes the coupling between gear unit and machine and with it a recurring alignment and maintenance task. Gearing quality matches the rest of the family: case-hardened and ground teeth in every stage, generous bearing spans for the overhung pull of a head pulley, and one oil sump covering bevel and helical stages alike.
Comparing the Installation Options in This Family
| M3RSF | Right-angle build, solid output, foot mounted - drives through a standard coupling |
| M3RHF | Right-angle build, hollow output, foot mounted - machine shaft enters the bore directly |
| M3RHT | Hollow output on a torque arm, for shaft-mounted drives without a foundation |
| M3PHF | All-helical parallel-shaft build with the same hollow output option |
| Sizes | The same letter system runs across the horizontal frames 50 to 90 |
Reading the table across shows why the family behaves like a system: the torque path, the shaft connection and the mounting are ordered as separate letters, so a plant can settle on the layout each drive point needs without abandoning one maintenance doctrine. Spares, oils and inspection intervals carry over across the whole range.
Typical heavy-duty applications:
- Long-centre trough conveyors with the drive point offset from the motor room
- Rotary dryers, coolers and conditioning drums in fertiliser works
- Chain and scraper conveyor head drives in bulk handling
- Filter and centrifuge drives in mineral processing plants
- Pulp washers and decker thickeners in paper mill circuits
- Clarifier and rake drives where the machine shaft carries the torque
M3RHF60 Code Walk-Through
| M3 | Industrial series with three gear stages |
| R | Bevel input stage giving a right-angle drive |
| H | Hollow low-speed shaft, keyed or shrink-disc connection |
| F | Foot mounting to industry-standard bases |
| 60 | Frame size 60 in the horizontal range 50 to 90 |
Technical Support and Quotation
WGT issues the M-series catalogue together with the size 60 outline drawing as PDF downloads, so the bore, seat and foot pattern can be verified against the machine shaft before any commitment. Send the driven machine, the motor power and speed, the required output speed, the shaft diameter and the running profile; the rated torque is checked against those inputs, a written quotation follows, and every unit ships factory-tested in an export wooden crate with a one-year warranty.
The M3 Series at a Glance
| 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 |
All frames in the table belong to one industrial family. P = helical parallel-shaft, R = bevel-helical right-angle; the low-speed shaft is solid (S) or hollow (H), mounted on feet (F) or a torque arm (T).
Selection Example: Chain conveyor head drive
Take a 55 kW motor at 1480 rpm driving a chain conveyor head shaft at 19 rpm. The ratio follows directly: 1480 / 19 = 77.9, so a ratio near i=78 is selected. In this case the size 60 hollow bore carries the head shaft directly and the right-angle input shortens the drive bay. That single division gives the catalogue ratio; the service factor for your duty class is then applied to the torque, and the frame size follows.
![how to size a industrial helical gearbox in four steps]()
Sizing flow: motor speed, target output speed, torque, service factor.
Where This Series Works in Practice
Airport baggage conveyor
An airport baggage-handling integrator uses reducers on check-in conveyors. Thousands of start-stop cycles a day are absorbed without overheating, and the low noise level matters in a public terminal.
Quarry primary crusher
A quarry operator fits industrial gear units on its primary jaw crusher feeders. The shock of rock dumped straight from the haul truck is covered by the service factor, and the cast-iron housing shrugs off years of dust and vibration.
Technical Questions, Answered
Should I choose a solid or hollow output shaft?
A solid shaft with a keyed coupling is the flexible, conventional choice. A hollow shaft takes the driven shaft directly with a key or shrink disc, removing one coupling and one alignment step; it is preferred where space or alignment access is limited.
How do I match the gear unit to my existing foundation?
Send the nameplate or the outline drawing of the unit being replaced. Frame dimensions follow the common industry dimension ladder, so foot holes, shaft heights and flange bolt circles normally match without redrilling foundations.
![industrial helical gear reducer application fields]()
Common application areas for right-angle industrial helical drives.
Duty Data In, Firm Model Out
Three numbers decide it. Skip the back-and-forth: configure your drive in the WGT Motor & Gearbox Online Selection System and send us the result for a same-day quotation.
Motor power and speed, required output speed and the driven-machine description fix the selection. Send them and the confirmed model, service factor and price come back in writing the same day. Looking for a gear reducer for textile machinery? Tell us the duty point and we will confirm the model in writing.
