SPX Stone W-138 3 phase Turnstyle switch — a direct-fit replacement electrical control component. Ordering the electrical control component 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-7004-42
- Type: Genuine OEM electrical control component
A lift motor tells you it's failing before it quits. It hums but won't turn (a dead start capacitor or a seized pump), it starts slow or weak (worn windings or low voltage), it trips the overload after a minute (drawing too much current), or it runs hot and smells of scorched varnish (insulation breaking down). A motor that's tripping, humming, or smelling hot is on its way out.
Electrical wear is about cycles and connections. Every press of the up button makes and breaks a contactor's points, and those points erode a little each time until they no longer pass full current. Loose connections aren't age so much as vibration and heat working a lug loose over the years. A motor's bearings and start capacitor are the parts that clock hours; the switchgear wears by count of starts.
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.
- Overhead Limit Switch only 1Ø - Rotary N413-1
- SPX Stone P461-2 1258-AA MicroSwitch (also used for OH limit)
- SPX Stone MicroSwitch w/boot
- SPX Stone Rotary W-35 Turnstile Switch for 3ph
- SPX Stone 4610-AA Start Switch Button
- SPX Stone 4477-AB 3 phase Turnstyle switch
Replacing your electrical control component
Most lift electrical work follows the same order: verify power is off, trace the circuit from source to motor, replace the failed part, then power up and test both operation and the safety stops. Guessing at where in the chain the fault lives wastes time and risks the wrong part. For that reason the full procedure is worth reading first. Not sure on the procedure? Find your lift in our parts lookup or call and we will walk you through it.
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 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 an electrical fault
Start at the source and work in. Confirm the breaker is on and not tripped, the disconnect is closed, and voltage is actually present at the lift with a meter — don't assume. A lift that's completely dead is usually upstream: a tripped breaker, a blown fuse, an open disconnect, or a loose feed. Verify power arrives before you condemn anything on the lift itself.
Parts commonly replaced at the same time
Electrical faults often involve more than one component — a failed contactor can take a relay or a switch with it, and worn wiring shows up alongside. While the panel is open, check the companions so you are not back in there next week. Tell us your lift's voltage and phase and we will match the related parts.
Safety notes
Isolate the lift from power before you touch any electrical component — lock the disconnect out if the shop has one. Lift control circuits mix line voltage with low-voltage safety inputs, and a miswire can defeat an overhead shutoff or a lock. If you are not confident on the control system, stop and call for help before something moves unexpectedly.
Before you order
Have the data plate in front of you — model, serial, voltage, phase — before ordering electrical parts. These details decide which relay, switch, or motor fits, and getting them wrong means a return. If the markings on the old component are readable, share them and we will match exactly.
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 electrical control component from Auto Lift Services
We install, inspect, and repair automotive lifts every week — the ALS-7004-42 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 w 138 spx stone
Every order for the w 138 spx stone starts with a fitment confirmation. Two lifts of the same model can carry subtle revisions between production years, and a component that fits a rev-A lift may not fit a rev-B lift built two years later. Before your card is charged we verify the piece against the parts breakdown for your specific lift serial number. That five-minute step is the difference between the part arriving and being installed the same afternoon versus the wrong piece showing up and the shop losing a day of billable work.
Technical specification & installation notes
Cycle life on this piece depends heavily on operating conditions. In a typical commercial repair shop running 6-10 lifts per day, the w 138 spx stone should deliver five to eight years of service before showing measurable wear against the OEM inspection specification. In a high-volume tire or alignment shop running 20+ lifts per day per bay, expect service every three to five years. It is designed to be a serviceable component; when it does wear it wears within safe operating margins that trigger visible symptoms — drift, uneven wear, minor leakage — well before failure becomes a safety issue.
Shipping & ordering
Placing an order online is the fastest path — add to cart, check out, done. If the shop needs a purchase order, net-30 terms, or a formal quote for a fleet-service contract, our accounts team handles those via email at [email protected] or by phone at 800-674-9302. Volume pricing on the w 138 spx stone kicks in at 10+ pieces on the same order for common wear items. Ask about the volume rate specifically before you check out — many fleet buyers stock 6-12 pieces at a time and the discount is meaningful over that shelf life.
Warranty coverage
Return policy on the w 138 spx stone 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
Cross-reference on the w 138 spx stone is straightforward: match the OEM part number from the lift's parts breakdown against the number on your original invoice. If the numbers match, the component fits. If your lift's parts breakdown lists a superseded or alternate number, we accept the superseded value on the phone as confirmation of fit. When a manufacturer has issued a running change during production, we track the change in our catalog so ordering by the older number automatically pulls the current-spec replacement.
Questions about the w 138 spx stone? 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.
SPX Stone W-138 3 phase Turnstyle switch
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