The M3RSF70 bevel helical gear unit places the right-angle construction in the middle of the horizontal size ladder, where cement coolers, apron feeders and thickener rakes demand torque that entry frames cannot carry continuously. A spiral-bevel input stage turns the drive 90 degrees into two ground helical stages, ending on a large-diameter solid output shaft ready for a heavy coupling. Around that core is the same horizontally split cast-iron housing that defines the whole industrial family, so inspection, lubrication and spare-parts planning stay uniform across the plant.
A Mid-Ladder Right-Angle Frame for Heavy Conveying
Size 70 is chosen when the duty point outgrows the smaller R frames but the installation still wants the compact lateral motor arrangement. The bevel stage is machined for accurate tooth contact, the helical stages are case-hardened and ground, and the bearing arrangement is rated for the overhung loads that belt pulleys and chain sprockets impose over years of three-shift running. Because every frame from 50 to 90 shares the same design language, a plant running size 50 or 60 R-builds can step up to 70 without changing its maintenance doctrine.
How Size 70 Compares Within the R Family
| M3RSF50 | Entry frame, right-angle, solid shaft, foot mounted |
| M3RSF60 | Size 60 build for continuous conveyor and washer duty |
| M3RSF70 | This unit: size 70, three stages, foot mounted, solid low-speed shaft |
| M3RSF80 / 90 | Larger frames at the top of the foot-mounted right-angle band |
| M3RHF / M3RHT | Hollow-shaft builds of the same frames, foot or torque-arm mounted |
The letters behave independently of the size number, so any frame can be ordered as a solid or hollow output and as a foot or torque-arm mounting. One size ladder, several installation styles - the practical reason industrial buyers treat the family as a site standard.
Typical heavy-duty applications:
- Clinker conveyor and cooler discharge drives in cement works
- Apron and pan feeders beneath primary crushing stations
- Concentrate and tailings thickeners with rake lifting gear
- Wood yard log decks, debarkers and chipper infeeds
- Steel billet transfer cars and rolling mill roller tables
- Sugarcane carrier and milling tandem intermediate drives
Reading the M3RSF70 Code
| M3 | Industrial series with three gear stages |
| R | Bevel input stage giving a right-angle drive (P would keep all stages parallel) |
| S | Solid low-speed shaft, keyed for a standard coupling |
| F | Foot mounting on industry-standard foundations |
| 70 | Frame size 70, mid-range of the horizontal build 50 to 90 |
Ordering Support and Supply
WGT issues the M-series catalogue and the size 70 outline drawing as PDF downloads, so shaft height, bolt pattern and coupling fit can be confirmed against the existing foundation up front. Send the driven machine, the motor power and speed, the required output speed and the running hours per day; the rated torque is verified against those inputs and a written quotation follows. Units leave the factory tested, packed in an export wooden crate and covered by a one-year warranty.
Full Frame Range of 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 |
Every frame in the table can be ordered with alternative shaft and mounting styles. If you are matching an existing installation, send the nameplate details and we confirm the equivalent frame in writing.
Installation Snapshots
Asphalt plant aggregate feeder
An asphalt plant powers its aggregate feeders with reducers in outdoor, dusty conditions. The cast-iron housing and standard paint finish have come through several winters without refurbishment.
Fertiliser granulator drum
A fertiliser producer drives granulator drums with gear units. The slow, high-torque rotation needed to tumble the granules is a natural fit, and the torque-arm option avoids a heavy base frame.
Selection Example: Apron feeder drive
Take a 90 kW motor at 1485 rpm driving an apron feeder under a primary crusher at 12 rpm. The ratio follows directly: 1485 / 12 = 124, so the three-stage band plus a raised service factor covers the shock feed. In this case the size 70 frame and ground gearing absorb crusher shock without a fluid coupling. Use the same method for any frame in the series, then confirm the service factor with us - it is the one number buyers most often get wrong.
![speed reducer selection process diagram]()
The selection path we follow when checking your enquiry.
Technical Q&A
What if the ratio I need falls between two catalogue steps?
Choose the next available step and adjust the driven speed, or ask us for a special pair of gears. Trimming the driven machine is normally cheaper than ordering a special ratio, and a slightly higher ratio never hurts the drive.
How is the unit protected against dust and water ingress?
Housings are sealed to IP55 as standard with NAK oil seals and gasketed covers. Heavy dust, washdown chemicals or steam cleaning call for the higher protection option, which we specify together with the correct lubricant.
![speed reducer use cases across sectors]()
Typical installation environments for this gearbox family.
Sample Units Available for Performance Testing
Validating before you commit? One screen in the WGT Motor & Gearbox Online Selection System is usually enough to pin down the frame size; we confirm the service factor afterwards.
Sample units can be supplied for bench or field testing so your team can confirm noise, temperature rise and backlash before a production order. Tell us the test conditions and we will prepare the documentation. Looking for a gear motor for car wash system? Tell us the duty point and we will confirm the model in writing.
