The Rotary FJ783-12MF seal kit is the direct replacement for the Rotary lift it came off of. Cross-referenced as ALS-7511-10, 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 seal kit 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-7511-10
- Brand: Rotary
- Type: Genuine OEM seal kit
- Fits: SP55, SP84, SP88, SP94, SP98, SPO7, SPO84, SPO88, SPO98, SPOA88, SPOA98
- Lift type: 2-post lift
Seals and hoses age on two clocks at once: cycles and years. A cylinder seal wears from the miles the rod travels; a hose gets brittle just sitting in shop heat and cold. Run dirty fluid and you speed both up, because grit scores the barrel and the rod and shreds seals from the inside. Most lifts that pump every day start weeping a seal somewhere in the eight-to-fifteen year range.
The hydraulic side of a lift is a closed loop: the power unit's motor drives a pump that pushes fluid from the reservoir, through a hose and fittings, into a cylinder that does the lifting, while a lowering valve meters it back to tank on the way down. Every part in that loop either moves fluid, holds pressure, or seals it in. When one link weeps or won't hold, the whole lift feels it.
What lifts this seal kit fits
This seal kit 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.
- SP55
- SP84 — see the exploded parts breakdown for this lift
- SP88 — see the exploded parts breakdown for this lift
- SP94 — see the exploded parts breakdown for this lift
- SP98 — see the exploded parts breakdown for this lift
- SPO7 — see the exploded parts breakdown for this lift
- SPO84 — see the exploded parts breakdown for this lift
- SPO88 — see the exploded parts breakdown for this lift
- SPO98 — see the exploded parts breakdown for this lift
- SPOA88 — 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.
- Hydraulic Cylinder - Rotary FJ7311
- Cylinder Seal Kit (Texas Hyd) - Rotary FJ7311-12T
- Hydraulic Cylinder & Adapter Kit - Rotary FJ7375/FJ7211
- Cyl Seal Kit Texas/Massey Universal - Rotary FJ783-12U
- Cylinder Adapter Fitting - Rotary FJ741-7
- Bleeder Screw in Pacoma Cylinders - Rotary
Replacing your seal kit
Replacing a power unit means confirming the voltage matches, killing power at the breaker, bleeding the hydraulic pressure, then transferring the lines and wiring to the new unit and refilling with the correct fluid. Getting the voltage and the fluid right is what separates a working swap from a paperweight. The complete procedure covers each step in order. Full step-by-step: how to reseal a lift cylinder.
Find the right part for your lift
Want to be sure before you buy? Pull the model and serial off your lift's plate and open our Rotary parts lookup to open the exploded parts breakdown for your model — find your part on the drawing and you know it fits. New to finding your model number? our guide to finding your model number covers it, or send a photo of the plate and we will read it for you.
Signs of a hydraulic problem
Check for drift-down as the clearest internal-leak test: raise the lift, shut it off, and time how long it holds. A properly sealed system holds height for days. Noticeable sag in a few hours points to the lowering valve not seating, a failed check valve, or a piston seal passing fluid — cracking the cylinder and watching whether it sags with the valve closed isolates which.
Parts commonly replaced at the same time
The parts near a hydraulic failure are usually next in line — seals that are hardening, a hose that is cracking, fittings that seep. Do them together while the system is open and bled. We will match the seal kit, hose, and oil to your lift so you are not chasing the same leak in a month.
Hydraulic fluid
Most 2-post and 4-post lifts run hydraulic oil equivalent to ISO-32; some older units were filled with Dexron ATF. Check what your lift currently uses and do not mix the two — and defer to your lift's installation manual for the exact fill capacity, since it varies by model.
Safety notes
A hydraulic lift that drops or drifts almost always traces to air or a failed seal, both of which are preventable. Relieve pressure before opening anything, bleed until the stream runs solid, and never sign off a repair with the lift drifting even slightly at full height. Locks stay engaged while you work.
Before you order
Before ordering, confirm your lift's model and serial and, for a cylinder or hose, the exact length or fitting configuration — these change across production runs. If you only need to stop a leak, a seal kit may be the smarter buy than a whole cylinder; call and we will help you decide before you spend.
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.
Why buy your Rotary seal kit from Auto Lift Services
We install, inspect, and repair Rotary lifts every week — the ALS-7511-10 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.
About this fj783 cyl seal
The fj783 cyl seal is a direct-fit replacement engineered to restore original manufacturer performance on the lift model it services. Every piece we ship carries the exact dimensional and material specifications the OEM published for that application. Fitment on this component is critical: it interfaces with adjacent hardware in ways that any deviation from spec can drive premature wear on nearby parts or trigger the lift's mechanical safety systems into an unexpected condition. Shops that source this from us instead of a generic aftermarket substitute consistently report zero fitment issues on first-time installation.
Technical specification & installation notes
Torque and installation notes for this component follow the manufacturer's service manual. Where a torque value is called out, use a calibrated torque wrench and follow the tightening sequence the manual publishes for that fastener location — many lift assemblies require star-pattern or crosswise tightening to distribute load evenly. Skipping that step is one of the most common reasons a correctly-sourced fj783 cyl seal still ends up needing to be re-serviced within a year. Our tech line at 800-674-9302 will walk your installer through the procedure if the shop does not have the current service manual on hand.
Shipping & ordering
Shipping runs 3-5 business days on standard ground to the lower 48 states. Expedited overnight and two-day options are available; call 800-674-9302 before ordering to quote expedited freight. We stock the fj783 cyl seal in Iowa and ship same-day for orders confirmed before 2 PM Central. Orders that come in later than that or on a Friday afternoon pick up on the next business day. A tracking number gets emailed to the address on the order the moment the package leaves our dock.
Warranty coverage
Return policy on the fj783 cyl seal follows our store-wide standard: all parts sales are final; exchanges only if the piece arrives defective. In the case of a defective delivery, ship the failed piece back to us at your cost, we verify the defect on receipt, and ship a replacement at ours. Wrong-item deliveries where we made the shipping error follow a different path — we reimburse the return shipping cost and cover freight on the correct part. Contact [email protected] with the order number to start either process.
Cross-reference & fitment
Alternate applications for the fj783 cyl seal sometimes exist. Where a common part fits multiple lift models across a manufacturer's catalog, cross-reference sheets show the compatible models explicitly. If you are consolidating parts stock and want to know which of your lifts the piece covers, email the request to [email protected] with a list of the lift models in your bay — we return a compatibility grid showing which lifts accept the replacement and which need a different number.
Questions about the fj783 cyl seal? Call our parts desk at 800-674-9302 or email [email protected]. We ship nationwide from our Iowa warehouse and answer fitment questions within one business day.
Cyl Seal Kit Mass Ferguson - Rotary FJ783-12MF
Parts that fit your lift
This Rotary part fits the lift models below. Click your model to see every part that fits it — handy for grabbing the wear items that usually go at the same time (cables, sheaves, pins, locks).
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