8 Things to Check Before Accepting a Vibratory Screen Delivery: A Quality Inspector’s Checklist

If you’re the one signing off on a new vibratory screen, separator, or finishing machine from a supplier like Sweco, the moment of delivery can feel like a mix of excitement and dread. Excitement because you finally get the equipment. Dread because you know what happens if something is off: rework, delays, and a headache with the vendor.

This checklist is for the person who has to accept the delivery—not just physically, but from a quality and specification standpoint. It’s not a setup or operation guide. It’s the “look before you touch” list. I’ve been writing these down for years after a few incidents that cost us time and money.

Here are the 8 steps I run through before I sign any delivery note. Skip one, and you might be sorry later.

Step 1: Verify the Model and Serial Number Against the PO

Sounds obvious, right? You’d be surprised. I once had a client receive a Sweco 60-inch finishing machine when they had ordered a 48-inch. The paperwork matched the wrong PO. It happens when the shipping team is busy and the models are similar.

Check the nameplate. Not the box, not the packing list. The nameplate on the machine. Cross-reference the model number and serial number with your purchase order. It’s a 30-second check that can save a world of paperwork later.

Step 2: Inspect for Shipping Damage—Specifically the Screen Mesh and Seals

Everyone looks for big dents. That’s fine. But the damage that sneaks up on you is to the screen mesh and the elastomer seals.

A tiny tear in the mesh might not be visible until you’re processing material. A seal that got pinched during transport will vibrate loose after a few hours of operation. I run a fingernail along the gasket area—if it feels compressed unevenly, I flag it.

If I remember correctly, we once had to reject a shipment because the seals had clearly been spooled on a too-small radius. The vendor didn’t catch it. We did, because we looked.

Step 3: Check Vibration Motor Alignment and Fastener Torque

Vibratory equipment relies on precise weight placement on the motor shafts. If the motor or eccentric weights were shifted during shipping, the machine will run rough. Worse, it might not even start if the interlock on the bottom cover is damaged.

I look for witness marks or paint chips around the motor mount bolts that indicate the motor shifted. I also check that the bolts are torqued to spec. There’s a specification plate on the motor—most people ignore it. (I should note: the spec plate is usually on the side of the motor housing, not the machine frame.)

If your Sweco machine has the standard Motion Analysis footprint, the bolt torque should be within the range listed in the owner’s manual. Out of spec? Don’t sign the delivery.

Step 4: Confirm the Correct Number and Type of Springs

This is the step most people overlook. Vibration damping springs (coil springs or air mounts) are specific to the machine’s weight and vibration pattern. A machine shipped with the wrong spring rate will either hammer itself to death or won’t generate enough stroke.

Check the springs against the BOM. Count them. Are they all present? Are they the same type? If the machine has a suspension system, check the condition of the bushings.

I once did a blind test with our shop crew: same machine model, one with correct springs, one with a substituted “similar” spring. 100% of the crew identified the wrong-spring machine as “rougher” in less than 2 minutes of operation. The cost difference on the spring set was maybe $50 per unit. On a 12-spring setup, that’s $600 for a machine that would actually pass a vibration analysis scan. Pretty cheap insurance.

Step 5: Verify Electrical Compliance (Phase, Voltage, Frequency)

This sounds like an electrician’s job, but you can do the basic check yourself. Look at the motor nameplate. Does it match the voltage available on your site? 460V vs 480V? 50Hz vs 60Hz?

Most Sweco motors are dual-rated. But not always. I had a situation in Q1 2024 where a machine ordered for a 50Hz facility arrived with a 60Hz-only motor. The vendor claimed it was “standard.” We rejected the shipment. That quality issue cost us a redo and delayed our launch by two weeks. All because someone didn’t check the motor plate.

Even if the motor is multi-voltage, check the wiring diagram for the starter. Some installations require a specific contactor size. Better to verify now than during startup.

Step 6: Run a Dry Noise and Vibration Test

Before you fully accept, ask the vendor or your own maintenance team to run the machine dry for 10 seconds. Listen for knocking, scraping, or uneven running.

I’m not 100% sure about every model, but in my experience, a healthy vibratory screen should produce a consistent hum. If it sounds like a washing machine with a load of shoes, something is wrong.

You can also do a simple touch test: place your hand on the top deck. The vibration should feel uniform. If one corner is dead, you have a spring issue or a broken weld in the support structure.

Take this with a grain of salt: the dry test isn’t a substitute for a proper vibration analysis, but it catches the obvious problems. I call it the “don’t embarrass yourself in front of the client” test.

Step 7: Inspect the Finish and Paint (Yes, Seriously)

For a piece of heavy equipment, paint might seem cosmetic. In my experience, it’s an indicator.

Poor coverage, orange peel texture, or visible rust at the weld points suggest corners were cut in manufacturing. If the paint isn’t up to spec, what else is off?

I check for paint thickness near the weld zones on the screen box. If the paint is bubbling, it means the surface wasn’t properly cleaned before coating. That’s a flag for potential corrosion in a few months.

For Sweco equipment, they typically use a 2-part epoxy. If your machine looks like it was spray-painted in a driveway, send it back.

Step 8: Document Everything You Find (and What You Didn’t)

Last step: take photos. Lots of them. The nameplate, the springs, the seals, the motor mounting, the vibration test video. Date-stamp them and save them in your project folder.

Why? Because if a problem shows up three months later, the vendor might claim it was caused by your operation. Having photos that show the springs were already misaligned on delivery shuts that argument down fast.

I keep a simple checklist in our system for our 50,000-unit annual order. Every delivery has to pass the 8 steps. It’s not rocket science. It’s just methodical. And it works.

Common Mistakes

Most problems come from skipping Step 4 (the springs) or Step 2 (the seals and mesh). People focus on the big things and miss the small ones. The small ones cause the most downtime.

One more thing: if you order a small batch or a single machine for testing—don’t let anyone tell you that you don’t deserve the same inspection process. Small doesn’t mean unimportant. The vendors who treated my $1,200 orders with the same attention as the $50,000 ones earned my loyalty. That’s the kind of vendor you want building your equipment.