HELAC ALTERNATIVE
L20-15-E-CL-180/90-S1-O-H Rotary Actuator
Alternative rotary actuator for the Helac L20-15-E-CL-180/90-S1-O-H, a compound-angle helical actuator providing 180/90-degree rotation in the 56 kg class, supplied for aftermarket replacement.
Helac L20 series helical rotary actuator
Specifying a new program? Talk to our engineering team →
Independently supplied alternative — not an original Helac part. Compatibility is verified before ordering.
HM Model Reference
HMR2-180 — HM's closest model in the 1,690 Nm class
This reference sits in the 1,690 Nm class. The closest HM model is HMR2-180 — Helical, L20-style foot mount — 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
L20-15-E-CL-180/90-S1-O-H
HM Model Reference
HMR2-180
Rated torque
Rated pressure
Rotation
Mounting
Output shaft
Valve options
| Original L20-15-E-CL-180/90-S1-O-H | HM HMR2-180 | |
|---|---|---|
| Rated driving torque | Not verified | 1,690 Nm |
| Rated pressure | Not verified | 210 bar |
| Rotation | 180/90° | 180°; stop at 90° available |
| Mounting | Not verified — confirm on unit | FT — Foot |
| 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 | HMR2-{spec}-180-FT-{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 (1,690 Nm) at HM's 210 bar rating.
- Helical, L20-style foot mount architecture.
- Rotation: 180° available on the HMR2 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.
L20-15-E-CL-180/90-S1-O-H
L20 series
| Segment | Field | What it tells you |
|---|---|---|
| L20 | Series | L20 series — frame size and mounting family |
| 15 | Model size | Size 15 — rated drive torque is set by this number (thousand in-lb class in the L/T key) |
| E | Measurement system | English system — SAE/UNF threads, SAE ports |
| CL | Housing / mounting | Mounting code not in the published ordering key — confirm against the tag or drawing |
| 180/90 | Rotation | Special rotation — 180° base / 90° final, set by an internal stop tube in 10° steps |
| S1 | Shaft / flanges | Cantilever — shaft flange only (single) |
| O | Valve | No valve |
| H | Seals and bearings | Standard seals and bearings |
Full ordering key and how to read a tag: identifying a rotary actuator.
What the 180/90° sweep changes on this build
This reference is listed with more than one sweep. The sweep is part of the build identity, so the unit on the machine has to be identified by its own setting before anything is matched.
- Read the stop positions off the mounting drawing before ordering — do not infer them from the code alone.
- Ask why the original used this sweep; a non-standard angle usually answers a linkage constraint that a standard unit will not fit.
- Confirm the sweep on the unit tag matches the code, since special builds are sometimes re-stopped in service.
When this sweep is the right build
- Linkages whose geometry was designed around this exact sweep — the stop positions usually answer a clearance or interference constraint.
- Rebuild work where the surrounding mechanism has to stay unchanged, so the sweep cannot be normalised to 180° or 360°.
- OEM builds where the sweep was specified by the machine maker rather than chosen from a catalogue.
Confirming the sweep on the machine
- Measure the swing between the mechanical end stops on the machine, not between the positions the linkage happens to use.
- Compare the measured swing with the code on the tag; special builds are sometimes re-stopped in service.
How the sweep sits in the order code
The sweep is the fifth segment of the code, and here it carries a value outside the standard range. That value is a build instruction, not a selection from a list: it has to travel with the enquiry together with the stop positions, because the stop tube is cut for it.
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.
We do not publish a conversion table between sweeps. If the sweep on your unit differs from the code above, send the tag and the mounting drawing and the build is confirmed against them.
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
- L20-15-E-CL-180/90-S1-O-H
- Original brand
- Helac
- Type
- Rotary actuator
- Rotation
- 180/90°
- Weight
- 56 kg
Confirmed data only
Technical specifications
| Product type | Hydraulic rotary actuator |
|---|---|
| Rotation angle | 180/90° |
| Unit weight | 56 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 L20 range
Questions
Frequently asked questions
What does the L20-15-E-CL-180/90-S1-O-H replace?+
It is the model code for a Helac helical rotary actuator providing 180/90° rotation in the 56 kg class. Our alternative is matched to the same rotation, 56 kg class and mounting interface.
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