How to Replace a Recliner Actuator: Measure, Match, and Fit It Right

A recliner that stops halfway, groans, or only moves in one direction usually has one tired part: the actuator. Replacing that one part is far cheaper than replacing the chair — but only if the new actuator matches the old one in the five places that matter. Get one of them wrong and the new part will not fit, will not finish its travel, or will starve on a power supply that cannot feed it.

This guide walks through the replacement in the order that prevents those mistakes: identify, measure, match, then fit.

First, Decide Whether Replacement Is the Right Call

Replace the actuator when the chair's frame, upholstery, and mechanism are still sound and the fault points at the actuator itself: it hums but does not move, moves in one direction only, stalls under a load it used to carry, or has a visibly damaged rod or cable. Our troubleshooting checklist helps you confirm that before you spend anything — many "dead actuator" cases turn out to be a loose connector or a tired power supply.

Do not replace the actuator to fix a bent frame, a seized hinge, or a broken scissor mechanism. A new actuator pushing against a jammed mechanism will stall, overheat, and fail the same way. Fix the mechanism first, then judge the actuator.

And one safety rule before anything else: unplug the chair from power before you touch the actuator or its wiring. Work with the chair unplugged, keep fingers out of the scissor mechanism while testing, and never bypass a limit switch or fuse to "see if it works."

Step 1: Identify What You Have

Before you measure anything, photograph three things on the old actuator:

1. The label. Voltage (12V or 24V), force rating, stroke, and model number, if any of them are printed there. A phone photo beats memory — labels rub off, and you will need these numbers in Step 4.
2. The connector and wire count. Most recliner actuators run on two motor wires: reverse the polarity and the actuator reverses direction. If yours has extra wires or a multi-pin plug beyond the two motor wires — for position feedback, for example — photograph the plug and its pin layout. Feedback plugs differ between brands and are not interchangeable by assumption. A standard two-wire replacement fits a two-wire chair; a feedback chair needs its feedback question answered before you order, not after.
3. How it mounts. Which end is fixed to the frame, which end pushes the mechanism, and what the brackets look like. Mounting brackets are included with HyHaven retail actuators, but bracket shape and hole size still have to suit your chair's pins — see Step 3.

If the label is gone and the manual is lost, you are not stuck — you just have to measure more carefully in Steps 2 and 3 instead of copying numbers.

Step 2: Measure Stroke and Retracted Length

These two measurements decide whether the replacement can do the chair's job at all. Measure both with the actuator removed, on a bench, with a tape measure:

• Stroke is how far the rod travels, from fully retracted to fully extended. Extend the rod by hand only if it moves freely; otherwise measure it on the chair at its two end positions, or read it off the label. Our stroke measurement guide covers both methods in detail.
• Retracted length is the total length of the actuator when the rod is fully in, end to end. This decides whether the new part fits in the chair's space when closed.

The rule for replacements is stricter than for new builds: match the original stroke. A longer stroke will try to push the mechanism past its designed end position and can bend brackets or jam the linkage. A shorter stroke will leave the footrest half-open or the backrest half-reclined. A new-build project can pick the next stroke up and design around it; a replacement into an existing mechanism cannot.

Retracted length matters just as much. Two actuators with the same stroke can have different body lengths. If the new body is longer, it may not fit between the mounting points when retracted — even though its stroke is right.

Step 3: Measure the Mounting Points

An actuator that cannot pivot freely at both ends will fail early, because every cycle will bend the rod sideways instead of pushing straight. Check three things:

• Pin-to-pin distance at both end positions (fully retracted and fully extended), measured between the centres of the two mounting pins. These distances must match the replacement's mounting geometry, or the mechanism's travel will change even if the stroke matches.
• Hole diameter and bracket width. Measure the pin hole with calipers if you have them, and note the bracket width the pin has to span. A pin that rattles in an oversized hole, or a bracket that has to be forced onto the pin, will wear quickly and run noisily.
• Swing clearance. With the old actuator removed, move the mechanism through its full range by hand and watch both mounting ends. Both ends must be free to rotate as the angle changes. If anything in the chair fouls the actuator body or cable at any point in the travel, the replacement will foul there too — fix the clearance, not the actuator.

If your chair's brackets are damaged, replace the brackets with the mechanism, not around it. An actuator is only as straight as its mounts.

Step 4: Match Voltage and Current to the Existing Power Supply

This is the step most replacement buyers skip, and the one that causes the most "new part, same problem" returns.

Voltage must match. A 12V chair system needs a 12V actuator; a 24V system needs a 24V actuator. Do not put a 24V actuator on a 12V supply hoping it will run slowly — it will run weakly and may stall under load — and do not put a 12V actuator on a 24V supply, which will overdrive the motor. If you want to change voltage, you are changing the power supply and possibly the controller as well, not just the actuator.

Current must fit the supply. Read the amps on the existing power supply's label, then compare them with the new actuator's full-load current — not its no-load current. An undersized supply sags under load: the actuator runs slowly, stalls early, or trips its protection. Use this table, and size for the voltage you actually have:

Two notes on this table. First, the U5's full-load current is not listed here because it was not in the verified set used for this guide — check its product page before sizing a supply for it. Second, a recliner rarely needs the heavy end of this range; the table is here so you can check the supply, not so you can pick the biggest number. If your chair's original force rating is on its label, match it or step one rating up at most. A far stronger actuator is not a free upgrade: it draws more current, may need a new supply and controller, and can overpower a mechanism designed for a lighter part. Our power supply sizing guide explains the sizing logic in full.

If the existing supply cannot cover the replacement's full-load current, replace the supply too — with one rated above the actuator's full-load draw at the right voltage — and confirm the controller is rated for that current as well. See our wiring guide and browse controllers and remote kits for the control side.

Step 5: Fit It, Then Test It Unloaded

1. Mount both ends, pins seated, brackets snug but free to pivot. Route the cable where the mechanism cannot pinch or rub it at any point in the travel.
2. With the chair still unloaded — footrest free, nobody sitting in it — run the actuator through its full travel in both directions. It should reach both ends and stop by itself at each end. That automatic stop is the built-in limit switch doing its job; our limit switch guide explains what it does and does not do.
3. Listen and watch. Grinding, jerking, or a rod that visibly bends sideways means a mounting or alignment problem — stop and fix it before loading the chair. A healthy replacement runs smoothly unloaded and only slows somewhat under load.
4. Only then sit in the chair and run it under normal load. If it stalls under normal load but ran fine unloaded, recheck Steps 3 and 4: binding in the mechanism, or a supply that cannot hold voltage under load, are the usual causes — not a faulty new actuator.

Common Replacement Mistakes

FAQ

Do I need the same brand as the original?

No. Brand does not matter; the five matches do: stroke, retracted length, mounting geometry, voltage, and current capacity. A different brand that matches all five will work; the same brand that misses one will not.

Can I use a stronger actuator than the original?

You can step up one rating if the supply and controller can feed it, but a far stronger part is not an upgrade. It draws more current, and it can push a mechanism harder than the mechanism was designed for. Match first, upgrade cautiously.

Why does my new actuator run slower than the old one?

Usually one of three reasons: it is carrying more load than the old one did (binding in the mechanism), its supply voltage sags under load, or it is simply a slower-geared model. Compare speeds at the same load and voltage before concluding the part is faulty — speed always drops from no-load to full-load.

The new actuator moves in only one direction. Is it broken?

Not necessarily. One-direction movement is more often a wiring or controller fault — a broken wire, a reversed connection, or a switch that only passes polarity one way. Run through the troubleshooting checklist before returning the part.

Can I reuse the chair's original power supply and remote?

Yes, if the voltage matches, the supply covers the new actuator's full-load current, and the controller is rated for that current. If any of the three fails, replace that piece too rather than forcing the combination.

How long should a replacement last?

That depends on load, alignment, and environment more than on the calendar — see our maintenance guide for the checks that actually extend life. A correctly matched, freely pivoting replacement in a sound mechanism should outlast a mismatched one by a wide margin, whatever the brand.

Still choosing? Start from the measurements in Steps 2 and 3, check them against our linear actuator selection guide, and size the supply with our power supply sizing guide. If a measurement does not match anything on the product page, that mismatch is the answer — do not order around it.