HELAC ALTERNATIVE
L30-65-S-RF-360-S1-C-H Rotary Actuator
Alternative rotary actuator for the Helac L30-65-S-RF-360-S1-C-H, a large 360-degree helical rotary actuator with round-flange mount and integral counterbalance valve, supplied for heavy-duty mining use. It is listed by Atlas Copco / Epiroc under part number 3128312644 on the Boomer 282 underground face-drill rig.
Atlas part number
3128312644
Alternative rotary actuator for Helac L30-65-S-RF-360-S1-C-H.
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
HMR4-750 — HM's closest model in the 7,340 Nm class
This reference sits in the 7,340 Nm class. The closest HM model is HMR4-750 — 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
L30-65-S-RF-360-S1-C-H
HM Model Reference
HMR4-750
Rated torque
Rated pressure
Rotation
Mounting
Output shaft
Valve options
| Original L30-65-S-RF-360-S1-C-H | HM HMR4-750 | |
|---|---|---|
| Rated driving torque | Not verified | 7,340 Nm |
| Rated pressure | Not verified | 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 (7,340 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.
L30-65-S-RF-360-S1-C-H
L30 series
| Segment | Field | What it tells you |
|---|---|---|
| L30 | Series | L30 series — frame size and mounting family |
| 65 | Model size | Size 65 — rated drive torque is set by this number (thousand in-lb class in the L/T key) |
| S | Measurement system | Special / custom build (older tags use S for special) — not a standard E or M unit |
| RF | Housing / mounting | Rear flange |
| 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
- L30-65-S-RF-360-S1-C-H
- Original brand
- Helac
- Type
- Rotary actuator
- Rotation
- 360°
- Weight
- 141 kg
- Original part no.
- 3128312644
Equipment reference
Known applications
Based on equipment records, part number 3128312644 is the rotary actuator on the Atlas Copco / Epiroc Boomer 282 underground drilling rig, built to the Helac L30-65-S-RF-360-S1-C-H configuration. Confirmation against your machine build plate and the actuator tag is recommended.
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° |
| Unit weight | 141 kg |
| 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 L30-65-S-RF-360-S1-C-H replace?+
It is the model code for a Helac helical rotary actuator providing 360° rotation in the 141 kg class. It is listed by Atlas under part number 3128312644. Our alternative is matched to the same rotation, 141 kg class and mounting interface.
How do I know this fits my machine?+
The same actuator is recorded on the Boomer 282. 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.
Will this fit an Atlas Copco / Epiroc Boomer 282?+
Yes. On the Atlas Copco / Epiroc Boomer 282 face-drill rig the rotation actuator is supplied under part number 3128312644, corresponding to the Helac L30-65-S-RF-360-S1-C-H configuration (360-degree rotation, round-flange mount, integral counterbalance valve). Before ordering we confirm the mounting face, port position and rotation against the tag and a photo or drawing of your unit.
What do the S, RF and C-H sections of the code mean?+
Reading the Parker-Helac ordering key: the first S is the measurement-system field and marks a special/custom design (standard keys are E for English/SAE and M for metric/BSPP; custom builds are also written ES or MS). RF is the rear-flange housing, the later S1 is the shaft/end-cap flange code (S1 cantilever, S2 straddle), C is the counterbalance-valve option (0 = no valve; V = valve-ready), and the final H is the standard seals & bearings package (S = special seals & bearings) — the exact seal compound is read from the tag/drawing, not assumed from H. Send the full code or a tag photo and we confirm the exact variant.
How do Atlas Copco/Epiroc numbers 3128312644 and 3128305918 relate?+
Atlas Copco/Epiroc lists the L30-65 rear-flange 360-degree mining build under 3128312644. The same actuator family is also seen under 3128305918, where the build is written with the SF flange/end-cap code (L30-65-S-RF-360-SF-C-H) rather than S1 — a closely related but not necessarily identical configuration. Send the exact number and code on your tag and we confirm the precise flange, ports and rotation before quoting.
What is Atlas Copco/Epiroc part 3128307754?+
3128307754 is the seal/repair kit associated with this L30-65-S-RF-360 actuator family, not a complete actuator. If you need the full rotary actuator, the complete-unit reference on this build is 3128312644; if you only need the service/seal kit, tell us and we assist with the kit separately. Confirm against your tag before ordering either.
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