HELAC ALTERNATIVE
L30-125-M-FT-360-S1-C-H Rotary Actuator
Alternative rotary actuator for the Helac L30-125-M-FT-360-S1-C-H, a large 360-degree, foot-mount helical actuator in the L30-125 class, rated at about 14,125 Nm output torque at 207 bar. It is listed by Atlas Copco / Epiroc under part number 3128314313 (also written 3128-3143-13) and is commonly associated with Simba production-drill rigs.
Atlas part number
3128314313
Alternative rotary actuator for Helac L30-125-M-FT-360-S1-C-H — also listed as 3128325839.
Specifying a new program? Talk to our engineering team →
Independently supplied alternative — not an original Helac or Atlas part. Compatibility is verified before ordering.
HM Model Reference
HMR4-1400 — HM's closest model in the 14,100 Nm class
This reference sits in the 14,100 Nm class. The closest HM model is HMR4-1400 — Helical, L30-style heavy-duty — matched on torque class only. The left column repeats what this reference's own record states, reproduced as published; the right column is HM's own rating. The table shows what carries over and what still has to be checked on your unit.
Original
L30-125-M-FT-360-S1-C-H
HM Model Reference
HMR4-1400
Rated torque
Rated pressure
Rotation
Mounting
Output shaft
Valve options
| Original L30-125-M-FT-360-S1-C-H | HM HMR4-1400 | |
|---|---|---|
| Rated driving torque | ~14,125 Nm | 14,100 Nm |
| Rated pressure | 207 bar | 210 bar |
| Rotation | 360° | 180° / 360°; stop at 90° available |
| Mounting | Not verified — confirm on unit | FT — Foot / FF — Front flange / RF — Rear flange |
| Output shaft | Not verified — confirm on unit | 1F — Single flange shaft / 2F — Double flange shaft |
| Valve options | Not verified — confirm on unit | NV / CB / CS |
| Ordering pattern | Not applicable | HMR4-{spec}-{angle}-{mount}-{output}-{valve} |
Left column: this reference's own published figures, reproduced as recorded. Any field the record does not establish is marked “Not verified” and is never filled from HM data. Right column: HM's own rating at HM's stated pressure. Confirm both against the unit nameplate and mounting drawing before ordering.
What carries over
- HM torque class (14,100 Nm) at HM's 210 bar rating.
- Helical, L30-style heavy-duty architecture.
- Rotation: 180/360° available on the HMR4 series. A 180/90 code is a 180° unit with the stop set at 90°, not a separate build.
What has to be verified
- Shaft / output flange interface and spline.
- Mounting bolt pattern and pilot register.
- Port size and position, plus valve arrangement (NV / CB / CS).
- Overall envelope and tie-rod clearance.
Comparable performance based on rated torque class for engineering comparison. The mounting interface must be confirmed by our engineering team before quotation.
Same base, other builds
Other configurations of this size
One base size is built in several mountings, angles and valve arrangements. If your unit carries a different code from the one on this page, start from the closest build below.
Code anatomy
What each part of this code means
Every segment below is read from the manufacturer’s published ordering key. Where a segment is not published, we say so instead of guessing — those are the ones to confirm from the tag or the drawing before ordering.
L30-125-M-FT-360-S1-C-H
L30 series
| Segment | Field | What it tells you |
|---|---|---|
| L30 | Series | L30 series — frame size and mounting family |
| 125 | Model size | Size 125 — rated drive torque is set by this number (thousand in-lb class in the L/T key) |
| M | Measurement system | Metric system — metric threads, BSPP ports |
| FT | Housing / mounting | Foot mount |
| 360 | Rotation | Standard 360° rotation |
| S1 | Shaft / flanges | Cantilever — shaft flange only (single) |
| C | Valve | Counterbalance valve fitted |
| H | Seals and bearings | Standard seals and bearings |
Full ordering key and how to read a tag: identifying a rotary actuator.
What the 360° sweep changes on this build
A full-turn build: the output sweeps a complete revolution. The hose loop and its clamping have to survive the whole sweep, which is why a full-turn unit is checked as a hose-routing question as well as a torque question.
- Check the hose loop clears the housing through the full revolution, not just at the rest position.
- Confirm the duty actually needs a complete turn — a half-turn build of the same size is the usual choice where it does not.
- Rotation stops, if the machine has them, sit outside the actuator and still have to be checked.
When this sweep is the right build
- Duties that genuinely index through a full revolution — rod handling, turret positioning, continuous swing.
- Linkages where the return path is part of the cycle rather than a reversal of the same half turn.
- Machines already built around a full-turn hose loop, where a half-turn unit would leave the routing over-travelled.
Confirming the sweep on the machine
- Turn the linkage through a full revolution by hand and watch the hose loop — a unit that binds at three quarters of a turn is a routing problem, not a torque problem.
- Check whether the machine has an external rotation stop; if it does, the sweep on the tag is not the limit the linkage actually uses.
How the sweep sits in the order code
The sweep is the fifth segment of the code. Going to the half-turn build of the same size changes that segment and the internal stop tube; flange, shaft and valve stay as they are. Where a machine only needs two positions, the half-turn build is the shorter hose route and the smaller envelope.
Where these two builds get mixed up
- A full-turn unit is sometimes quoted where the linkage only swings half a turn, which over-travels the hose loop for no benefit.
- If a full-turn unit will not pass a quarter or half turn under load, the cause is usually hose routing or an external stop, not the actuator.
Same torque class
Other references our customers compare with this one
These builds sit in the same torque class as the unit on this page. Same class does not mean interchangeable — the mounting interface, shaft and port arrangement are confirmed against your tag or drawing before quoting.
At a glance
Quick reference
- Original model
- L30-125-M-FT-360-S1-C-H
- Original brand
- Helac
- Type
- Rotary actuator
- Rotation
- 360°
- Rated torque
- ~14,125 Nm @ 207 bar (L30-125 series rated output)
- Weight
- 285.8 kg
- Original part no.
- 3128314313, 3128325839
Equipment reference
Known applications
Part number 3128314313 is commonly listed on the Atlas Copco / Epiroc Simba S7D and Simba H1257 production-drill rigs. Several different turning devices can be fitted across a machine range depending on serial number and build, so please confirm against your machine serial number and the actuator nameplate before ordering.
If your machine is not listed, send the full model and serial number — other builds may use the same actuator.
Confirmed data only
Technical specifications
| Product type | Hydraulic rotary actuator |
|---|---|
| Rotation angle | 360° |
| Rated torque | ~14,125 Nm @ 207 bar (L30-125 series rated output) |
| Unit weight | 285.8 kg |
| Cross reference | L30-125 series rated performance (about 14,125 Nm at 207 bar, foot/front-flange/rear-flange mounts, 180/360-degree builds) per the published Helac catalog. The exact build, ports and mounting are confirmed against the unit tag and drawing before a replacement is supplied. |
| Further data | Torque, pressure, port and mounting dimensions are shared with the engineering drawing on request. |
HM alternative model — confirmed on inquiry. Send us your original model number, part number or machine details and we confirm the matching configuration, specifications and compatibility, then quote. The exact ordering code — rotation, output and valve arrangement — is confirmed against your unit and is not published online.
Other models in the Helac L30 range
Showing 8 of 17 other models in this range.
Questions
Frequently asked questions
What does the L30-125-M-FT-360-S1-C-H replace?+
It is the model code for a Helac helical rotary actuator providing 360° rotation in the 285.8 kg class. It is listed by Atlas under part numbers 3128314313, 3128325839. Our alternative is matched to the same rotation, 285.8 kg class and mounting interface.
How do I know this fits my machine?+
The same actuator is recorded on the Simba S7D, Simba H1257, Boltec MC. Before quoting we confirm the mounting face, port position and rotation against the tag and a photo of your unit, so the replacement matches your exact build.
Which rigs use Atlas Copco / Epiroc part 3128314313?+
Part number 3128314313 is commonly listed on the Simba S7D and Simba H1257 production-drill rigs, corresponding to the Helac L30-125-M-FT-360-S1-C-H configuration (360-degree rotation, metric BSPP ports, foot mount). Because rigs of the same range can be built with different turning devices, send the part number on your tag or a nameplate photo and we confirm mounting, shaft and ports before quoting.
What is Atlas Copco / Epiroc part 3128325839?+
Reference 3128325839 is an MS (metric, special-port) build within the same L30-125 foot-mount family as 3128314313 rather than a different actuator class. The port/thread package and mounting detail differ from the standard S1 listing, so it should not be assumed interchangeable; send your tag number or nameplate and we confirm the exact MS configuration and whether a direct replacement can be supplied.
Why is the exact HM model and price not shown?+
We confirm the HM model per inquiry after verifying the interface and operating parameters with you. This avoids shipping a part that looks right by model name but differs in mounting or rotation. Price is provided with that confirmed quote.
Request a check
Looking for an alternative to this model?
Send us the original model number, part number, machine model or a drawing. We check the available option and confirm specifications and compatibility for you.
- Original model / part number
- Machine brand & model
- Quantity & annual demand
- Mounting photo or drawing (if available)
Or email directly: hm@hmhydraulics.com