The M3RVHF50 vertical hollow shaft gear unit combines a right-angle bevel input with a bored vertical output: the process shaft rises through the bore, the spiral bevel stage lets the motor sit alongside at deck level, and three-stage helical gearing behind it turns the torque down the vertical axis. For tank mixers and deep pump lines, the result is one machined assembly standing in for a pedestal, a top bearing and a long coupling.
Bore Output Meets Right-Angle Input
Each feature solves a different site problem. The hollow bore lets the gearbox hold the process shaft against radial and thrust components with alignment set by machined faces, while the bevel input frees the layout from a motor tower above the machine. Together they suit installations where headroom is short, the shaft is long, and the motor has to remain reachable from a walkway - a combination found on storage tanks, aeration basins and jetty pump decks.
What the Code Commits To
| M | Three-stage industrial gear unit family |
| R | Spiral bevel first stage taking the input at ninety degrees |
| V | Vertical axis with the output directed into the process |
| H | Hollow output shaft bored for the through-going shaft |
| F | Foot and flange mounting on headplate or structure |
| 50 | Frame size in the vertical range |
Seal and Bearing Choices That Decide the Service Life
On a bored vertical unit two parts write the maintenance history: the shaft seal, exposed to whatever the process releases beneath it, and the lower bearing, which carries every newton the shaft generates. Seal grade and bearing set are therefore chosen from the stated environment, not defaulted. State vapour, solids content and temperature in the enquiry and the drive is sized for its atmosphere rather than for a showroom.
Machine groups this unit is specified into: Floating-roof tank mixers on crude and fuel storage Vertical circulation pumps in aquaculture raceways Digestion tank stirrers at biogas plants Vertical firewater pumps on offshore platforms Lime slurry agitators in flue gas treatment Deep aeration basin mixers at treatment works Vertical brine pumps in salt and chlorate plants Cyclone feed stirrers in mineral tailings duty
Erection Sequence That Protects the Mesh
Headplate flatness and squareness come first, because tilt passes through the bore straight into the seal lip and lower bearing. Shaft end float is set to drawing so unit and process bearings share thrust as designed; the breather takes its vertical-service position and the oil level is read only with the unit level and at rest. Torque reaction is taken by the flange bolt circle, never by the shaft, and the anchorage deserves engineering attention equal to the bore itself.
Documentation and Dispatch
Delivery includes a dimensional drawing, an oil chart per mounting posture and a nameplate pinning frame, ratio and arrangement for future repeats. Bore size, keyway or shrink-disc detail and the seal variant are agreed before release, so the crate at the dock matches the file in the plant office. The bore ships plugged against dust, and day-one commissioning spares travel inside the crate with the unit.
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: Typical duty point
Consider a typical duty for this frame: the driven shaft has to run at a fraction of motor speed. Motor speed divided by the target output speed gives the ratio, rounded to the nearest available step, and the required torque with the service factor then fixes the frame size. 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
Dust-extraction fan bank
An environmental-equipment plant uses reducers on the rotary valve feeders of its dust-extraction systems. Compact size, quiet running and food-grade oil options made the approval easy.
Steel mill run-out table
On the run-out table of a small steel mill, units handle the repeated starts and stops of hot billet handling. The 42CrMo output shafts tolerate the thermal cycling, and torque-arm mounting keeps the drive clear of the roller frames.
Technical Questions, Answered
Can I reuse my existing couplings and foundations?
Yes. Centre distances, shaft dimensions and flange bolt patterns follow the common industry standards, so couplings, guards and foundations do not have to be redesigned. Send the nameplate details and we confirm the equivalent frame in writing.
Can the reducer be used outdoors or in a washdown area?
Standard paint and NAK seals suit sheltered outdoor duty. For washdown or coastal sites specify the heavy-duty coating, FKM seals and stainless fasteners; for humid rooms we recommend the breather and oil-check routine in the manual.
![industrial helical gear reducer application fields]()
Common application areas for right-angle industrial helical drives.
From RFQ to Dispatch - One Account Manager
Tired of chasing suppliers? 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.
One account manager follows your enquiry from selection to dispatch, with lead times and test dates confirmed in writing. Urgent unit needs and project volumes are handled on the same route. Looking for a speed reducer for cement plant? Tell us the duty point and we will confirm the model in writing.
