The M3PVHF90 vertical hollow shaft gear unit is the largest bored-output frame in the vertical band: the process shaft rises through the bore, the housing carries thrust and radial load, and the pedestal, top bearing and long coupling that a solid-shaft arrangement would demand all disappear into one machined part. On deep sump pumps, cooling tower fans and thickener rakes, that consolidation is worth more than any point of efficiency.
Choosing Bore Over Solid Shaft
The decision is about the load path. When the process shaft is long and the machine beneath it generates fluid unbalance or whip, a bored output lets the gearbox itself hold the shaft against both components, with alignment set by machined faces rather than by site adjustments. The 90 frame extends that logic to the longest shafts in the range, and its bearing set is dimensioned for the moment arms those installations produce.
The Code and What It Fixes
| M | Three-stage industrial gear unit family |
| P | Parallel-shaft helical gearing throughout |
| V | Vertical axis, output directed down into the process |
| H | Hollow output shaft bored for the through-going shaft |
| F | Foot and flange mounting on headplate or structure |
| 90 | Frame size in the vertical range |
Seals, Bearings and the Shaft Below
Two components dominate the service record of a bored vertical unit: the shaft seal, which faces whatever the process releases directly beneath it, and the lower bearing, which feels every newton the shaft produces. Ground helical stages keep losses and noise low, yet neither gearing quality nor a generous ratio can compensate for a seal grade picked without looking at the atmosphere. State the environment plainly in the enquiry and the drive repays it.
Machine groups this unit is specified into: Deep-well and line-shaft pumps on irrigation schemes Cooling tower fans on large natural-draft stacks Vertical recirculation pumps in desalination trains Silo and big-bag centre discharge drives Thickener rake drives with tall torque tubes Vertical mixer drives on fermentation vessels Sludge blanket and balance tank stirrers Offshore ballast and bilge vertical pump sets
Erection Rules That Matter
The headplate must be machined flat and square, because tilt passes straight into the bore and the seal lip. 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 only read with the unit level and at rest. Torque reaction belongs to the flange bolt circle - never to the shaft - and the anchoring should be engineered with the same seriousness as the bore itself.
Papers and Packing
Delivery includes a dimensional drawing, an oil chart per mounting posture and a nameplate that pins ratio, frame and arrangement for repeat orders. Bore size, keyway or shrink-disc detail and the seal variant are agreed before release so the unit on the dock matches the file in the plant office. The bore ships plugged against dust, and the commissioning spares - seals and fasteners - travel inside the crate, because the parts a site needs on day one should never need hunting.
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
Automatic car-wash line
A car-wash equipment builder fits hollow-shaft reducers to its conveyor chains. The compact frame hides inside the wash tunnel, and FKM seal options handle the constant moisture.
Textile dyeing drums
A dyeing machine maker uses speed reducers on its fabric-turning drums. Low vibration (under 20 microns) prevents streaks in the fabric, and the 94-96% efficiency keeps the heat load down in a warm workshop.
Selection Example: Typical duty point
Work through the numbers for this frame: 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. 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
Can you manufacture a custom ratio or a special shaft?
Beyond the catalogue ratios we can quote special ratios and custom output shafts - splined, extended, special keyways or drilled - for OEM volumes. Tooling is amortised across the order, so unit cost falls as quantity rises.
Will the unit match my existing gearbox interface?
The series is manufactured to the standard centre distances, shaft dimensions and flange patterns of its frame family, so couplings, guards and foundations do not have to be redesigned. Send the nameplate details and we confirm the equivalent frame in writing.
![speed reducer use cases across sectors]()
Typical installation environments for this gearbox family.
OEM Framework Pricing and Reserved Capacity
Building machines in series? 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.
For OEM programmes we hold framework prices and reserve production slots for scheduled call-offs, so your line never waits on a gearbox. Ask for the framework terms with your first enquiry. Looking for a gear reducer for textile machinery? Tell us the duty point and we will confirm the model in writing.
