The Rotary J136 replacement part is the direct replacement for the Rotary lift it came off of. Cross-referenced as ALS-1721/21B, 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 replacement part 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-1721/21B
• Brand: Rotary
• Type: Genuine OEM replacement part
• Fits: AP50E, AP50H
• Lift type: inground lift

This is a manufacturer-spec replacement part for the lift it was designed for — same dimensions, same material, same fit as the part that came off. That matters more on a lift than on most equipment, because lift parts do not work in isolation: a part that is close-but-not-quite transfers its error into whatever it bolts to, rides on, or seals against. A knock-off that is a few thousandths off might install fine and then wear its neighbors for the next five years. When you order to the published spec, the part drops in and the rest of the lift never knows anything changed.

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.

• Front Packing Gland - Rotary JG620
• 8-1/2" Packing Kit - Rotary - JG220OE
• 8-1/2" Packing/Gland Combo - Rotary - J136OE J136KIT
• 8-1/2" Pkg, Gland & Spacer - Rotary - J139

Confirm this is the right part before you order

Lift manufacturers revise parts mid-production without changing the model name, so the same lift bought two years apart can take two different revisions of the same component. Before you order, find the model plate on the lift — on most 2-post lifts it rides on one of the columns at eye level, on 4-post lifts it is usually on a column or the power-unit side runway — and note the full model number and serial. The serial dates the lift to a production run, and that is what decides which revision fits.

If the plate is painted over or missing, take a photo of the part you are replacing next to a tape measure and send it to us. Between the dimensions, the mounting pattern, and what lift it came off of, we can almost always identify the exact part before you spend money on the wrong one.

Before you install the replacement, compare it side by side with the part you removed — length, bore, thread, and mounting pattern should match exactly, not approximately. If the old part is worn out of shape, measure against the mounting points on the lift instead. A mismatch caught on the bench costs you a phone call; a mismatch caught after installation costs you the job twice.

Never modify a lift part to make it fit — no drilling out holes, no grinding down shoulders, no washers-as-spacers improvisation. A part that needs persuasion is the wrong part, and a modified part on a machine that holds vehicles over people is a liability with your name on it.

Why buy your Rotary replacement part from Auto Lift Services

We install, inspect, and repair Rotary lifts every week — the ALS-1721/21B 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.
• We confirm the right part for your lift's serial and production year before you order.
• Every part ships as genuine Rotary — no aftermarket substitution unless you specifically ask for an aftermarket equivalent.

If you also need companion wear items — cables, sheaves, seals, hardware — for the same repair, use our parts lookup and we will build the whole kit for your lift so you order once and finish the job.