The M3PVSF30 vertical parallel shaft gear unit is the compact end of the upright family: three helical stages in line, no bevel set, with the output turned straight down beneath the housing. Because the input and output stay in one vertical plane, the drive hangs from a machined flange at the top of the vessel or basin and the motor bolts onto the input side without any directional change in between. On a frame this size the whole unit weighs little enough for two people to place it by hoist, which keeps installation work off the critical path.
Where a Parallel Vertical Layout Wins
Keeping the gear stages helical-only brings two benefits at small scale: the mesh runs quieter than a bevel-helical build, and the housing casting is shorter, so the unit fits under low vessel roofs and inside covered skids. Agitation duties on small tanks, dosing systems and compact treatment trains are the natural ground, where torque is modest but continuous running matters more than peak rating. The trade is that the input motor sits beside the shaft line, so the layout needs a little side clearance that a bevel build would not.
For buyers comparing frames, the honest rule is simple: if the process shaft is short and the torque sits in the lower band, the parallel vertical build gives the same service life with fewer meshes to maintain.
Reading the Designation Letter by Letter
| M | Industrial multi-stage gear unit family |
| P | Parallel helical stages, input and output in one plane |
| V | Vertical build, output shaft pointing downward |
| S | Solid ground output shaft with parallel key |
| F | Foot pads plus top flange face for vessel mounting |
| 30 | Frame size, compact end of the upright range |
The frame number fixes the shafts, seals and casting; the ratio is a separate choice that sets the process speed. One frame therefore covers a wide speed span, and the same housing reappears across many duty sheets in a plant.
Lubrication on a Short Housing
With only three stages and a short vertical column, oil distribution is less demanding than on the tall frames, but the same reading discipline applies: fill to the plate quantity, check the level with the unit level and at rest, and keep the breather clear. Small units that run on dosing or circulation duty often work near the ambient temperature most of the day, so oil condition changes slowly - which is exactly why a fixed six-month sampling habit catches the rare emulsification case before it reaches the bearings.
Service profiles this build is regularly chosen for: Agitator drives on small chemical blending vessels Vertical cooling water pumps in compressor houses Paddle mixers in food-grade brine preparation Flocculation paddle rows in compact package plants Paint circulation loops in automotive coating shops Malt steeping turners inside germination boxes Dosing tank stirrers at water treatment skids Candle filter agitators in pigment finishing
Mounting and First Run
Set the flange face on a cleaned vessel boss, check it for flatness, and tighten the stud bolts evenly before any shaft work. Enter the process shaft through the coupling with the unit supported until the fixing bolts are torqued - a gearbox hung on its own output shaft twists the flange seating and shows up later as seal weep. Check motor rotation against the required shaft direction before closing the coupling guard.
Hand-rotate the train once, run unloaded for a short period, and log oil level, temperature and noise as the baseline record. On this frame size the whole check takes minutes, and it is the record that later proves whether a noise complaint is a gear matter or a loose base bolt.
What to Put in the Enquiry
Send the absorbed power or torque, required output speed, the vessel or basin shaft diameter, expected overhung load, mounting posture and the medium involved, together with ambient conditions and daily hours. A photo of the old nameplate and the available side clearance for the motor settle the remaining layout questions in one reply.
Repeat Orders and Records
The dimensional drawing, ratio and seal type belong with the vessel file, not in a project folder that gets closed. Plants that keep that pairing can reorder an identical compact unit from a nameplate photograph, and the factory can confirm the build without a survey visit. Across a fleet of small agitated vessels, that habit turns a spare-parts question into a one-message order.
Selection Example: Typical duty point
Take an M3PVSF30 unit on a driven machine that must turn far slower than the motor. 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. 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
Overland conveyor system
A mining company drives a two-kilometre overland conveyor with heavy-duty helical gear units at the head station. Continuous 24-hour duty, frequent starts under full load and minimal maintenance windows were all part of the specification.
Cement plant bucket elevator
A cement works renewed the gear units on its bucket elevators during a kiln shutdown. The new units bolted onto the old foundations without modification, and the elevator was back in service within the planned window.
![industrial gearbox applications - conveyor mixer crusher wastewater]()
Figure: typical industries that use the WGT S-series gear reducers.
Frequently Asked Questions
How do I calculate the ratio I need?
Divide motor speed by the target output speed (i = n1/n2), then check the required torque against the rating table with your service factor. The online selector below does this automatically.
Can the reducer be supplied with a brake motor or an IEC motor flange?
Yes. We supply the reducer as a bare unit with an IEC standard input flange, and you can bolt on any IEC or NEMA motor - including a brake motor. The flange dimensions follow the common IEC pattern, so existing motors drop straight on.
What is the service factor and how is it applied?
The service factor is a multiplier applied to your required torque to cover shocks and duty class - typically 1.0 for uniform duty, 1.25 for moderate shocks, 1.5 or more for heavy shock loads. Send us the driven machine and duty and we will apply the correct factor.
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 packaging machine? Tell us the duty point and we will confirm the model in writing.
