The Rotary N2122 arm restraint gear is the direct replacement for the Rotary lift it came off of. Cross-referenced as ALS-7545-16, it is the genuine Rotary part — same part number, same fit, and same working specification as the one already on your lift. Ordering the Rotary arm restraint gear from us gets you the OEM piece that matches the lift, not an aftermarket knock-off that is close but not the same.

Specifications

• Part number: ALS-7545-16
• Brand: Rotary
• Type: Genuine OEM arm restraint gear
• Fits: A10i, A10i EH-1, A10i EH-2, S10i, S10i EH-1, S10i EH-2, S10i EH-4, SPO10, SPO12 EH-1, SPO12 EH-2, SPO15 300 Series, SPO18 300 Series
• Lift type: 2-post lift

Lock ladders and pawls are matched geometry — the tooth pitch, the nose angle, and the mounting have to suit the specific lift. A ladder that almost fits will let the pawl sit shallow on the tooth, which is worse than obvious because it looks engaged and isn't. Match restraint parts to the actual lift model and column, not a close-enough substitute, because the whole point of the part is that it holds under full load.

Locks don't work in isolation — they depend on the release mechanism and the leveling of the lift. The lock-release cable or air cylinder pulls all pawls at once so the lift comes down even; if the lift isn't level, one pawl loads before the others and wears first. So when locks click unevenly, the cause can be the ladders, the pawls, the release, or stretched cables. Diagnose the set, not just the noisy corner.

What lifts this arm restraint gear fits

This arm restraint gear fits the lift models below. Click a model to open its visual parts breakdown — the exploded drawing with every part numbered, so you can confirm this is the right part for your exact lift before you order.

• A10I — see the exploded parts breakdown for this lift
• S10I — see the exploded parts breakdown for this lift
• SPO10 — see the exploded parts breakdown for this lift
• SPO12 — see the exploded parts breakdown for this lift

Related parts for this lift

The parts below are commonly ordered alongside this one — cables, sheaves, seals, and hardware wear on similar schedules, and most repairs go faster when the whole set is done in one visit.

• Arm Restraint Engage Gear - Rotary N2121
• Outer Rear Swing Arm - Rotary N2150-1
• Inner Rear Swing Arm Kit - Rotary N2103-1
• Arm Swivel Pin - Rotary N2154
• Arm Restraint Gear (Adjustable) - Rotary SVI Exclusive
• Outer Rear Swing Arm - Rotary N2151-1

Replacing your arm restraint gear

Getting the locks right means the pawl seats deep in the tooth, the spring returns it every time, and all the locks click in unison — nothing shallow, nothing sticking. It's not difficult work, but there's no partial credit on the part that catches a falling car. For that reason the complete procedure is worth reading before you start. Full step-by-step: how to replace lift arm restraint gears.

Find the right part for your lift

Not certain this is the exact part your lift needs? Start with your lift's model and serial off the data plate, then open our Rotary parts lookup to see the visual parts breakdown for your model — the exploded drawing with every part numbered and priced. If your plate is missing or unreadable, our guide to finding your model number walks through where to find it, or send us a photo and we will identify the lift for you.

Signs the locking system needs attention

Check that the ladder is tight on its mounts. A ladder that has loosened, shifted, or cracked at a bolt hole moves under load, which changes where the pawl lands and can let it slip past a tooth. Grab it and try to move it; there should be no play. Any give at the mounting means the ladder needs re-securing or replacing before the locks can be trusted.

Parts commonly replaced at the same time

Do the whole locking system while it is apart. The companion parts — springs, pawls, release cable — cost little next to the labor of opening the column, and matched hardware is what keeps both sides in sync. Give us your model and we will assemble the complete set.

Safety notes

When a lock stops working right, the whole safety design is compromised. Rounded latch teeth, weak springs, and misadjusted release cables all keep a carriage from seating fully. Service the locking system as a unit, test that both sides engage and release together, and never trust a load to a lock that drags or clicks late.

Before you order

Ordering tip: lock components are model- and vintage-specific, so read the plate before you buy. Since both columns should engage together, plan to service the lock hardware in pairs, and add the release cable if it is frayed. We will confirm the right parts for your production run.

Ordering the right revision

Before this goes in the cart, grab two things off your lift: the model number and the serial number, both on the manufacturer's plate. The serial matters more than most people expect — lift makers revise components between production runs without renaming the lift, and the run your serial falls in determines which revision of this part is correct.

If you are working from a failed part rather than a plate, measure what you have and photograph how it mounts. Send that to us along with the lift brand, and we will check it against the same parts breakdowns our own techs use in the field before you commit to the order.

Why buy your Rotary arm restraint gear from Auto Lift Services

We install, inspect, and repair Rotary lifts every week — the ALS-7545-16 is a part we handle in the shop, not a random SKU we drop-ship. The phone answers if you have a question mid-install — call 800-674-9302 — and every part ships genuine, no aftermarket substitution unless you ask for it.