The Rotary FJ7646-1 arm restraint gear is the direct replacement for the Rotary lift it came off of. Cross-referenced as ALS-7508-18, 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-7508-18
• Brand: Rotary
• Type: Genuine OEM arm restraint gear
• Fits: SP7, SPO7, SPOA7
• Lift type: 2-post lift

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.

Locks fail two ways, and both are dangerous. The pawl can stick — gummed with grease and grit, or a weak return spring — so it doesn't drop into the ladder when it should. Or the ladder teeth and pawl nose wear rounded, so the pawl won't hold and can skip under load. A lock that doesn't engage, or engages and won't hold, defeats the one part standing between a raised vehicle and the floor.

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.

• SP7 — see the exploded parts breakdown for this lift
• SPO7 — see the exploded parts breakdown for this lift
• SPOA7 — 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 Release Loop - Rotary FJ7985-1
• Arm Restraint Engage Gear - Rotary FJ7449
• Arm Restraint Gear (Adjustable) - Rotary SVI Exclusive
• Arm Restraint Gear (Super Adjustable) - Rotary SVI Exclusive
• Arm Restraint Gear (Not Adjustable) - Rotary FJ7750
• Rear Arm Restraint Assy - Rotary FJ7523

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

The surest way to get the right part is to work from your lift's own breakdown. open our Rotary parts lookup, choose your model, and every part is mapped on the drawing with its number and price. If you cannot find the model plate, our guide to finding your model number explains where each lift type hides it, and our phone line is open if you want a hand.

Signs the locking system needs attention

Pull the release and confirm every pawl retracts together. A pawl that lags on release means the lift will come down cocked and load one corner; a pawl that doesn't retract at all will drag on the ladder. The release mechanism — cable or air cylinder — is part of the lock system, so a lock complaint that isn't the pawl or ladder is often the release.

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.

Check your lift's serial before ordering

The most common reason a lift part comes back is not a defect — it is a revision mismatch. Manufacturers change sub-parts between production runs while keeping the same lift model name, so "it fits my lift model" is not always enough. The model plate carries the serial number that pins your lift to a specific run, and that is the number that settles which version of this part belongs on your lift.

Can't find the plate? Measure the old part — overall length, bolt-hole spacing, thread size on anything threaded — and photograph it from a couple of angles. Send that with your lift's brand and rough age and we will match it against the parts breakdowns we service from every week.

Why buy your Rotary arm restraint gear from Auto Lift Services

We install, inspect, and repair Rotary lifts every week — the ALS-7508-18 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.