Start from the nameplate. Send us a photo and we tell you if ours fits.
If you have to replace a planetary gearbox, the plate on the housing is where to start: it gives us the model and the ratio. The mounting dimensions decide the rest, and this page shows you which ones to measure.
How to read a gearbox nameplate
Every planetary gearbox carries a plate, usually on the housing near the output end. It holds the three figures that identify the unit: the model code, the gear ratio and the serial number. Different manufacturers label them differently, which is why the same plate can look unfamiliar.
What the fields are called
These are blank plates, not yet stamped: the fields are empty because the data is marked at the time of manufacture. They are here so you can recognise where to look and how the plate looks on the gearbox.
The six things that decide whether a gearbox fits
Interchangeability is decided by the mounting, not by the name on the plate. These are the six items to check, in the order that matters — four are dimensions, two come off the plate or the catalogue. The more of them you have, the faster and more precise our answer.
- Mounting flange, bolt circle and pilot diameter This decides more than anything else: if the mounting holes line up, the gearbox sits where the old one was. We need the bolt circle diameter, the number of holes and their size, plus the pilot diameter — the machined spigot that centres the gearbox on the machine. Measure the pilot even when the flange looks identical: two flanges with the same bolt circle can have different pilots. On foot-mounted units an alternative hole pattern will usually solve a different bolt circle.
- Output shaft: diameter and profile Diameter, length and type of coupling — splined, keyed cylindrical, or flanged. For a splined profile we also need the number of teeth and the module, normally shown on the machine drawing.
- Motor interface Hydraulic or electric, and to which standard (SAE, IEC or other). This is where differences between manufacturers show up most often. If the input is a male shaft, its diameter and profile matter too, so that whatever is fitted on it — a pulley, for instance — still fits.
- Gear ratio Shown on the plate. If the replacement has a different ratio the output speed changes: the swap is still possible, but it has to be assessed against the application.
- Rated torque The torque the gearbox has to transmit in continuous duty. Haumea plates do not carry it: it comes from the catalogue, from the model code.
- Brake, if fitted A spring-applied brake changes both the envelope and the interface. If your gearbox has one, tell us: it has to be matched on the replacement.
A dimensioned example: the PG 1003 MC 57.5
| Dimension | Output side | Motor side |
|---|---|---|
| Bolt circle and holes | Ø295 — 10 holes Ø17 | Ø106.4 — 2 holes M12 |
| Pilot diameter | Ø230 f7 | Ø82.55 H8 |
| Shaft | Ø90 h6 with key, extension 170 | Ø25 CH.8 — interface 12012, SAE 2-bolt |
| Gear ratio | 57.5 | |
| Rated torque | 1221 daNm continuous, 2442 daNm peak | |
| Spring-applied brake RA25 | braking torque 22 daNm · release 19 bar · 300 bar max | |
The brake is a separate item: if the gearbox you are replacing has one, tell us — it changes the envelope and the interface, and it has to be matched against the brake fitted on the replacement.
Full or partial interchangeability
Not every replacement is a straight swap, and the difference is worth knowing before you order.
Full
It bolts straight on. Same mounting envelope, same motor interface, same output — flange, feet, shafts. The Haumea unit takes the place of the existing one using the holes that are already there.
Partial
One element of the coupling needs adapting. The most common case is the same output flange with a different shaft diameter, or the other way round. What this involves is assessed case by case — we tell you before you commit to anything.
In both cases gear ratio, output torque and radial and axial loads are checked separately, against the data sheets or the catalogue. They are not implied by the mounting fitting.
Check your gearbox
Fill in what you have to hand. The starred fields are the ones that let us answer yes or no. If one is missing, send it anyway: we will work with the rest, and call you if we need more.
What happens next
| Who answers | The Haumea sales office |
|---|---|
| How long | Within 24 hours |
| What you get | Confirmation of whether a Haumea PG/PGA equivalent exists, whether the interchangeability is full or partial, and availability |
| Delivery | Ex works in 24 to 48 hours from order confirmation. Transit time to your country is quoted separately |
Comer Industries, SOM and Frama gearboxes
Haumea works in partnership with Comer Industries, and across the range from PG100 to PG9000 the Haumea PG/PGA frame sizes correspond directly to theirs. SOM and Frama are historic brands that were absorbed into Comer: if your gearbox still carries one of those names, tell us the code on the plate and we check the Haumea equivalent for that specific model. We also supply spare parts for Comer Industries gearboxes and for older SOM and Frama units.
Frequently asked questions
Are Haumea planetary gearboxes interchangeable with units from other manufacturers?
Yes. Gearboxes made and assembled by Haumea can be fully or partially interchangeable, in the mounting to the application, with planetary gearboxes from other producers. In many cases the existing unit can be replaced with a Haumea PG/PGA without modifying the machine.
What is the difference between a planetary gearbox and an epicyclic gearbox?
None: they are two names for the same mechanism, a gear train in which the planets rotate around a central sun gear. “Epicyclic” describes the path of the planets, “planetary” their arrangement. In industry the two terms are used interchangeably, and the Haumea PG/PGA series answers to both.
What exactly does partial interchangeability mean?
It means the mounting matches except for one element of the coupling, which has to be adapted. Ratio, output torque and radial and axial loads are always checked separately: they are not implied by the mounting fitting. The most common case is the same output flange with a different shaft diameter, or the reverse. The work involved is assessed case by case, and we tell you what it is before you commit.
How do I find the make and model of my gearbox?
From the nameplate on the housing, usually near the output end. If it is unreadable, the unit can be identified from its dimensions: flange, bolt circle, pilot diameter and output shaft. Send us what you can measure and a photo of where the plate should be.
Do you make custom planetary gearboxes?
Yes. Where no standard unit fits, the gearbox is built to the application — this is a large part of what Haumea does.
Do you also supply spare parts and individual components?
Yes. We supply spare parts for Comer Industries gearboxes and for older SOM and Frama units.
How long does delivery take?
The gearbox leaves our works 24 to 48 hours after order confirmation. Transit time depends on the destination and is quoted with the order.
How long before I know whether an equivalent exists?
Within 24 hours of sending the form.
The Haumea PG/PGA range
Frame sizes from PG 100 to PG 9000, with the ratio range and the rated torque of each.
| Frame size | Rated torque (kNm) Mc | Available ratios (i) |
|---|---|---|
| PG 100 | 1.00 | 3.55 - 3422 |
| PG 160 | 1.60 | 3.55 - 3422 |
| PG 250 | 2.50 | 3.77 - 2369 |
| PG 500 | 5.00 | 3.77 - 1845 |
| PG 700 | 7.00 | 3.66 - 2969 |
| PG 1000 | 10.00 | 3.55 - 2230 |
| PG 1600 | 16.00 | 3.55 - 2230 |
| PG 1800 | 18.00 | 13.00 - 1216 |
| PG 2500 | 25.00 | 4.00 - 1774 |
| PG 3000 | 30.00 | 14.20 - 1425 |
| PG 3500 | 35.00 | 4.00 - 1920 |
| PG 5000 | 50.00 | 4.00 - 1982 |
| PG 6500 | 65.00 | 3.83 - 1008 |
| PG 9000 | 90.00 | 4.00 - 1623 |
Have a gearbox to replace?
Send us a photo of the plate. You get an answer within 24 hours.