Main Switch for Jumbo NT - Nussbaum - 990304 990291 — 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-7454-68
- Type: Genuine OEM electrical control component
Electrical parts fail by heat and by contacts. A push-button's contacts pit and stop making a clean connection; a contactor's points burn and weld or chatter; a wire lug loosens, arcs, and cooks. Motors fail on windings, bearings, or a start capacitor. The tells are a lift that runs intermittently, won't start, trips the breaker, hums without turning, or greets you with the smell of hot varnish.
The one spec you cannot get wrong on lift electrics is voltage. A 110-volt motor and a 220-volt motor are not interchangeable, and neither are their contactors and overloads. Single-phase versus three-phase matters just as much. Read the data tag on the motor and match voltage, phase, and horsepower exactly — the wrong one either won't run, runs weak, or burns up the first time it's asked to 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.
Replacing your electrical control component
Servicing the safety cutouts — limit switch, overhead shut-off, overload — is about confirming the lift stops on its own when it's supposed to, not just that it runs. Replace the failed device, then test each cutout deliberately. Since these are what make the lift safe to operate, the step-by-step procedure is worth following start to finish. 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
The surest way to get the right part is to work from your lift's own breakdown. open our 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 of an electrical fault
Watch and listen to the contactor when you press up. It should pull in with one clean clack and hold silent. A contactor that chatters, buzzes, or pulls in and drops out is getting low coil voltage, has worn points, or isn't latching — and chatter hammers the motor with make-and-break current. Pitted, welded, or chattering contacts mean the contactor needs attention now, not later.
Parts commonly replaced at the same time
Plan the electrical repair as a circuit, not a single part. The components around a failure often share its age, and doing them together while power is off is safer and cheaper than repeat visits. Give us your lift's configuration and we will assemble the matched set.
Safety notes
Before the cover comes off, the power comes off — and gets verified off. Lift controls tie the motor, the interlocks, and the shutoff together, so a careless connection can make a lift move when it should not. Match the diagram, respect the safety circuit, and get help on anything outside your comfort zone.
Before you order
Ordering tip: electrical components are specific to the lift's voltage and phase, so read the plate before you buy. A 208-230V single-phase lift and a three-phase version of the same model do not share the same contactor or motor. Send the markings off the old part and we will confirm the match.
Ordering the right revision
Before this goes in the cart, grab two things off your lift: the model number and the serial number, both on the manufacturer's plate. The serial matters more than most people expect — lift makers revise components between production runs without renaming the lift, and the run your serial falls in determines which revision of this part is correct.
If you are working from a failed part rather than a plate, measure what you have and photograph how it mounts. Send that to us along with the lift brand, and we will check it against the same parts breakdowns our own techs use in the field before you commit to the order.
Why buy your electrical control component from Auto Lift Services
We install, inspect, and repair automotive lifts every week — the ALS-7454-68 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 990304 main switch
Every order for the 990304 main switch 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
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 990304 main switch 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
Freight covers the continental United States on all standard orders. We ship UPS or FedEx ground for parts under 30 lb; heavier assemblies quote at published carrier rates. International orders on the 990304 main switch require a freight quote — email dimensions, weight, and destination country to [email protected] and we return a rate within one business day. Alaska, Hawaii, and US territories quote at published rates and typically take five to ten business days depending on carrier and destination.
Warranty coverage
Every 990304 main switch sold through Automotive Lift Services carries a one-year manufacturer-defect warranty. If it fails within that window due to a defect in material or workmanship, we replace it at no charge. Damage from improper installation, use outside the lift's rated capacity, side-loading, or modifications to the parent lift are not covered. The warranty is documented on your original order receipt — retain that record for the coverage period. To submit a warranty claim, contact us with the order number and a photo of the failure at [email protected].
Cross-reference & fitment
Alternate applications for the 990304 main switch 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 990304 main switch? 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.
Main Switch for Jumbo NT - Nussbaum - 990304 990291
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