The Challenger 31107 arm restraint gear is the direct replacement for the Challenger lift it came off of. This is the genuine Challenger part — same fit and same working specification as the one already on your lift. Ordering the Challenger 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: 31107
• Brand: Challenger
• Type: Genuine OEM arm restraint gear

Rust is what usually kills a lock before wear does. The pivot seizes, the return spring corrodes and weakens, and the pawl stops dropping crisply into the ladder. On a lift that lives in a damp shop or an unheated garage, the locks are often the first safety part to go — not from cycles, but from a stiff, gummed-up mechanism that no longer moves the way it has to.

A safety latch is the positive stop that keeps a raised component — an arm, a carriage, a locking device — from dropping if something upstream lets go. It's designed to do nothing at all until the moment it's needed, which is exactly why it gets ignored. A latch that's rusted, bent, or missing its spring is a latch that won't be there in the one instant it matters.

Replacing your arm restraint gear

Replacing a lock ladder means getting the old one off its mounts, fitting the new one so the teeth line up with the pawl's travel, and securing it with no play. Then cycle the lift and watch the pawl catch a full tooth at every height. Because this is the lift's last line of defense, the full procedure is worth following start to finish. 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 Challenger 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

Raise the lift slowly and listen. The pawls at every column should click into the ladder crisply and, on a level lift, at the same time. A pawl that clicks late, skips a tooth, or doesn't click at all is either sticking or worn. Uneven clicks across columns point to a lazy pawl, a stretched cable, or a lift that isn't level — track it down before you trust the locks.

Parts commonly replaced at the same time

Lock hardware works as a set, so when one part is worn the others usually are too — latches, pawls, springs, and the release cable all age together. Doing the full lock rebuild on both columns at once keeps engagement even and saves a second teardown. We will assemble the complete lock kit for your model.

Safety notes

The locking system is the last line of defense on a lift, so a worn latch or sticky pawl is a safety defect, not a nuisance. Both columns must engage and release together; if one clicks late or drags, the lift comes out of service until it is corrected. Never defeat or wire back a lock to keep a lift running.

Before you order

Have your model and serial ready, and note whether you need parts for one column or both — even lock wear is best corrected as a set. If the release cable is stretched or frayed, order it alongside the latch and pawl. Not sure which version your lift uses? Send a photo of the old parts.

Not sure this fits? Here's how to check

Pull the number off your lift's model plate first — model and serial both. Manufacturers run mid-cycle revisions that keep the model name but change hardware, so two lifts with the same name on the column can take different parts. The serial is what removes the guesswork.

Second check: compare the old part against this listing before you order. Length, mounting pattern, and thread sizes tell most of the story. If anything doesn't line up, or if the old part is too worn or broken to measure, call us with photos — we work on these lifts every week and can usually confirm fit from a picture and the lift's serial faster than you can dig through a parts diagram.

Why buy your Challenger arm restraint gear from Auto Lift Services

We install, inspect, and repair Challenger lifts every week — the 31107 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.