HELAC ALTERNATIVE
L10-3.0-E-RF-180-S1-O-H Rotary Actuator
Alternative steering rotary actuator for the Helac L10-3.0-E-RF-180-S1-O-H, a compact 180-degree helical rotary actuator in the 12 kg class rated at 3,000 in-lb. It is listed by Husqvarna as steering actuator part number 541 20 09-94 on the RS8500D ride-on concrete saw, supplied for maintenance and aftermarket replacement.
Husqvarna part number
541 20 09-94
Alternative rotary actuator for Helac L10-3.0-E-RF-180-S1-O-H.
Specifying a new program? Talk to our engineering team →
Independently supplied alternative — not an original Helac or Husqvarna part. Compatibility is verified before ordering.
HM Model Reference
HMR3-030 — HM's closest model in the 340 Nm class
This reference sits in the 340 Nm class. The closest HM model is HMR3-030 — Helical, L10-style compact front flange — 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
L10-3.0-E-RF-180-S1-O-H
HM Model Reference
HMR3-030
Rated torque
Rated pressure
Rotation
Mounting
Output shaft
Valve options
| Original L10-3.0-E-RF-180-S1-O-H | HM HMR3-030 | |
|---|---|---|
| Rated driving torque | 3,000 in-lb | 340 Nm |
| Rated pressure | Not verified | 210 bar |
| Rotation | 180° | 180° / 360°; stop at 90° available |
| Mounting | Not verified — confirm on unit | FF — Front flange (standard) |
| Output shaft | Not verified — confirm on unit | 1F — Single flange shaft (standard) |
| Valve options | Not verified — confirm on unit | NV / CB / CS |
| Ordering pattern | Not applicable | HMR3-{spec}-{angle}-FF-1F-{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 (340 Nm) at HM's 210 bar rating.
- Helical, L10-style compact front flange architecture.
- Rotation: 180/360° available on the HMR3 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.
L10-3.0-E-RF-180-S1-O-H
L10 series
| Segment | Field | What it tells you |
|---|---|---|
| L10 | Series | L10 series — frame size and mounting family |
| 3.0 | Model size | Size 3.0 — 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 |
| RF | Housing / mounting | Rear flange |
| 180 | Rotation | Standard 180° rotation |
| 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° sweep changes on this build
A half-turn build: the output travels 180° between two end stops. The sweep is set by the internal stop tube, so a 180° unit cannot be turned into a 360° one by changing the valve or the porting — it is a different internal assembly.
- Two positions, 180° apart — confirm the linkage does not rely on an intermediate stop.
- Hoses only travel half a turn, so a short service loop is normally enough.
- If the duty is a tilt or a quarter-turn swing, this is the sweep the linkage was designed around.
When this sweep is the right build
- Tilt and positioning linkages that only need two end positions — a bucket tilt, a boom offset, a chute flap.
- Machines where the hose run is tight: half a turn needs a much shorter service loop than a full one.
- Where a mid-position stop is not part of the function, so the two end stops are the whole travel.
Confirming the sweep on the machine
- Swing the linkage by hand to both end stops and check the travel is a clean half turn with no mid-travel detent.
- Read the stop positions off the mounting drawing rather than counting turns of the output.
How the sweep sits in the order code
The sweep is the fifth segment of the code. Ordering the same size in the other sweep changes that segment and the internal stop tube behind it; the flange pattern, the shaft end and the valve selection do not change with it. That is why a half-turn build and a full-turn build of one size are quoted as two builds rather than one with an option.
Where these two builds get mixed up
- A half-turn unit is sometimes quoted against a full-turn drawing because the size and mounting match — the sweep is the field that gets dropped in the enquiry.
- A half-turn unit cannot be re-stopped to a full turn in service; if the machine needs more travel, it needs the other build.
At a glance
Quick reference
- Original model
- L10-3.0-E-RF-180-S1-O-H
- Original brand
- Helac
- Type
- Rotary actuator
- Rotation
- 180°
- Rated torque
- 3,000 in-lb
- Weight
- 12 kg
- Original part no.
- 541 20 09-94
Equipment reference
Known applications
Based on Husqvarna parts records, part number 541 20 09-94 is the steering (rotary) actuator in the hydraulic assembly of the RS8500D ride-on floor saw. 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 | 180° |
| Rated torque | 3,000 in-lb |
| Unit weight | 12 kg |
| Cross reference | May also cross to the Parker 53905-P041 series (e.g. 53905-P041-D / P065-D); the final match is verified against the tag on your unit. |
| 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 L10 range
Showing 8 of 10 other models in this range.
Questions
Frequently asked questions
What does the L10-3.0-E-RF-180-S1-O-H replace?+
It is the model code for a Helac helical rotary actuator providing 180° rotation in the 12 kg class. It is listed by Husqvarna under part number 541 20 09-94. Our alternative is matched to the same rotation, 12 kg class and mounting interface.
How do I know this fits my machine?+
The same actuator is recorded on the RS8500D. 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.
What other order codes are available in this same series?+
Other catalog configurations of the same actuator family include: L10-3.0-E-RF-180-S1-C-H. These are complete Helac order codes differing in rotation angle, ports, valve or mounting/flange arrangement; they are not interchangeable with the configuration shown on this page. Send the exact code on your unit tag or a mounting drawing and we confirm the matching build before quoting.
Will this fit a Husqvarna RS8500D?+
Yes. On the Husqvarna RS8500D ride-on concrete saw, the steering actuator in the hydraulic assembly is part number 541 20 09-94, the Helac L10-3.0-E-RF-180-S1-O-H. Before ordering we confirm the mounting face, port position and rotation against the tag and a drawing or photo of your unit.
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