The Weir Replacement Checklist I Use After Wasting $60,000 on Parts I Didn’t Need

I’ve handled Weir-brand slurry pump parts and other weir-related equipment for about eight years. I want to say eight, but don’t quote me on that. I’ve personally made—and documented—probably $60,000 worth of mistakes. Maybe more, I’d have to check the spreadsheets. I’m not proud of that number, but it’s why I keep a checklist now. This is the one I run before every replacement order.

Before we get into it, one warning: “weir” is both a brand and a general term. If you searched for the Kilcolgan weir construction date, this article is not about that—though the first lesson still applies. Know exactly which “weir” you’re dealing with before you spend money.

Use This Checklist When…

You’re about to order a replacement part and any of these sound familiar:

• A Weir Minerals slurry pump part like an impeller, throat bush, liner, or frame adapter
• A skimmer weir door replacement for a pool or intake screen
• A crusher attachment or bucket repair on a loading or excavation operation
• Any hydraulic or concrete weir system that needs a spare part or a maintenance plan

If the part is going onto equipment that’s still running, stop and do the steps below first. If it’s already broken, do them anyway—because the first replacement might be the wrong one.

Step 1: Pull the nameplate and BOM before you call anyone

I still kick myself for the time I ordered a Weir pump wear part from memory. It looked right in the conversation, but the frame size was one digit off. The part came in, didn’t fit, and I had to pay restocking plus freight. That was a $1,250 lesson.

Now I take a photo of every nameplate and email it to myself before doing anything else. On a Weir pump, the nameplate has the serial number and the BOM reference. I’ve also found that the Weir Parts Center can pull the correct revision if you give them the serial number—but only if you take the photo first. On a skimmer weir door, the model is often molded into the plastic or stamped on the hinge. On a crusher bucket attachment, the bucket and the attachment may have different serial numbers. Record both.

Step 2: Identify the “weir” context

When I first started in this role, I assumed every “weir” part was a pump part. That was wrong. A skimmer weir door replacement is not the same as a concrete weir system, and neither one uses the same lead time or tolerances.

If you’re here because of the Kilcolgan weir construction date, you need civil records, not a spare-parts catalog. I’ve made the mistake of guessing at a heritage structure date before. It cost me credibility and a three-day delay. If you’re dealing with a concrete weir, get the original drawing or the local authority’s records. Don’t rely on a forum post.

Step 3: Measure the old part, not just the part number

Part numbers change. Manufacturers update them, suppliers cross-reference them, and sometimes the previous buyer already installed the wrong one. The part number on your invoice is not the same as the part number on the equipment.

For a skimmer weir door replacement, measure the throat width, the height, the hinge pin diameter, and the gap between the hinge mounts. A 1/8-inch difference can make the door stick open or fail to close, and you won’t catch it until the skimmer is full of leaves.

For a crusher wear part or bucket edge, measure both the old component and the mating surface. If the bucket’s mounting holes are worn oval, the new edge will rattle and break within a week. If the crusher body is twisted, a new set of jaws won’t fix it.

Step 4: Ask “what’s not included” before “what’s the price”

This is the rule that would have saved me the most money. The vendor who lists every fee upfront—even if the total looks higher—is usually the one who costs less at the end.

Per FTC guidelines (ftc.gov), advertising should be truthful and not misleading. In practice, that means the base price isn’t a lie, but it also isn’t the total. I now ask for a line item breakdown of freight, expedite fees, customs, packing, and the core return if there is one.

I once accepted a quote because the base price was $300 less than another quote. Then the surprise freight was $470. The transparent quote, with shipping included, would have been $220 less in total. That’s when I learned to say the phrase out loud: “What’s NOT included in this price?”

Step 5: Check the parts next to the part you’re replacing

The most overlooked step, honestly. If you’re replacing one impeller, the seal and the throat bush usually need attention at the same time. If you’re doing a skimmer weir door replacement, inspect the hinge pin and the float insert. If you’re working on a crusher attachment, check the bucket’s edge, pins, and bushings.

If your operation uses a skull crusher—the bucket-mounted crusher attachment with heavy teeth—the tooth condition will change how the crusher feeds. Worn teeth can cause material to bounce instead of bite, and that puts stress on the crusher rotor. I’ve seen a $9,000 crusher repair caused by a $200 bucket edge that wasn’t replaced.

This is also the time to check for debris in the pump suction line. A pump that sounds like it’s cavitating might not need a new impeller at all. It might need the suction strainer cleaned. Replacing the expensive part first is the most expensive way to diagnose.

Step 6: Diagnose before you replace—the fuel pump lesson

If you’ve ever looked up how to start a car with a bad fuel pump, you know the workarounds: tap the tank, turn the key on and off, spray starting fluid. They might get you to a gas station. They don’t fix the pump. And the longer you run on a bad fuel pump, the more risk you have of damaging the fuel module or the engine computer.

Pumps are the same. Before you order a Weir slurry pump impeller or a new hydraulic pump, confirm the actual failure. Check the motor coupling alignment, the voltage, the inlet pressure, and the wear pattern on the old part. I once replaced a pump end because of a vibration, only to find the problem was a bent drive shaft. The pump part was fine, and I wore the cost of it for six months.

Step 7: Confirm lead time and the fallback plan

I don’t believe any industrial supplier has every replacement part sitting in stock. Some do, but don’t assume it. A made-to-order wear liner may have a four-week lead time, and that’s acceptable if you know it before you start tearing down the equipment.

Ask: Is this part in stock? If not, when is the next production run? What is the expedite cost? Is there an equivalent material or grade with a shorter lead time? The worst situation is discovering the lead time after the old part is already removed.

On a recent rush order, the upside was paying a 25% expedite premium. The risk was missing a shutdown window. I kept asking myself: is that premium worth potentially losing the whole maintenance window? In that case, it was. But I made the decision with the numbers on paper, not after the fact.

Step 8: Document everything for the next person

This sounds like office busywork, but it saves real money. Take photos of the part, the nameplate, the installation date, and the removal reason. Write the job number on the old part before it goes to scrap. Keep the packing slip in a job file.

I missed a warranty window once because I couldn’t prove when we installed the part. It was a $3,200 part, and the failure happened at 11 months—but the warranty was 12 months. Without a date code, the manufacturer said the part was out of warranty by age. I still kick myself for not writing the date on the housing.

Common Mistakes to Avoid

Here are a few I see in our own records and in the mistakes I keep hearing from peers:

• Assuming “weir” always means the brand. If you type “weir” into a search engine, you’ll get civil structures, pool skimmers, and mining pumps on the same page. Use the model number and context.
• Not checking the hinge pin on a skimmer weir door replacement. The door can be perfect, and the pin can still be bent. Replace both.
• Forgetting to inspect the bucket or attachment before ordering a new crusher. A worn bucket edge is a safety issue as much as a production issue.
• Treating a bad pump like a bad fuel pump. A temporary workaround can keep the line running for an hour, but it will not fix the root cause. Get the data before you replace the hardware.
• Believing that a premium part means zero maintenance. I wish that were true. It isn’t. Scheduled inspection is what keeps a Weir pump or a concrete weir structure working.

That’s the list. It’s not glamorous, and none of it will make you a hero in a meeting. But it has stopped me from ordering the wrong part more times than I can count. If you’re about to hit “buy” on any weir-related replacement, take ten minutes and run through these steps first. The part you don’t order is the cheapest part you ever didn’t buy.