When a machine goes down, someone runs to the parts counter, rattles off a number from memory, and two days later, a box shows up with a part that doesn’t fit.
That wrong part costs you more downtime and more money out the door. The fix is getting the right part number before you order.
This step-by-step guide walks you through exactly how to find a manufacturer's part number for any piece of heavy construction equipment.
You might think that your make and model is enough information, but it’s not always.
Manufacturers often update designs mid-production run. A CASE excavator built in January and one built in October of the same model year might share the same name but not the same pump. That mid-year change lives within a "serial number break," or a range where the design and part number changed together.
Here’s how to order by the manufacturer's part number with a verified serial number, so you can skip the headaches of receiving the wrong part.
Before you can find any part number, you need the machine's full serial number. Where the serial number is located depends on the machine:
When you find the plate, take a clear photo. Don't copy it by hand if you can help it. Transposed digits are among the most common reasons for ordering the wrong parts. A photo costs you nothing and saves a lot of grief.
The plate will typically show the full Product Identification Number (PIN), which includes the model designation, serial number sequence, and sometimes the build year embedded in the number itself.
The serial number plate has more useful information than most people grab. Here's what to look for:
If you're ordering a fuel system, hydraulic pump, or engine parts, the emissions tier is extremely important to ensure the part installs correctly.
This is where many parts orders go wrong. The machine serial number is a starting point, but for major components, you want the component's own identification plate.
A good habit when a machine comes in for service is to photograph every component plate you can access. Build a file for each machine in your fleet, and the next time something fails at 11 PM, you can easily find the information in the file.
Now you're ready to look up the actual manufacturer's part number. Here's how:
You've got a serial number and a candidate part number. Before you finalize the order, confirm the serial number break.
Most OEM parts books break each assembly into ranges: "serial number 001000–049999: use part A" and "serial number 050000 and up: use part B." These breaks occur when the manufacturer changes a design, updates a fitting size, adjusts a port location, or makes any other change in production.
If your machine's serial number is right on the edge of a break, double-check which range applies. When in doubt, ask your parts person to verify it against the actual parts book for your serial number.
Sometimes the part doesn't show up in the portal. Sometimes the machine's old enough that documentation is sparse. Sometimes you're staring at a component you can't identify.
That's not a dead end. That's when you call someone like Aleeshia Rhoad, our 2025 MVP and Parts Manager at the Mansfield branch, who does this kind of parts detective work every single day.
Watch Aleeshia in action: Aleeshia Rhoad | 2025 SEC MVP
Our parts team can pull OEM illustrated parts diagrams for CASE, Kobelco, BOMAG, Gradall, and the other lines we carry. We cross-reference serial numbers, verify breaks, and confirm compatibility before anything gets ordered. If it's a hard-to-find component, we tap into our dealer network and manufacturer contacts to track it down.
When a part isn't showing up in the system, we don't just shrug and send you to Google. We call the manufacturer directly, check inventory across our dealer network, and, when needed, have another dealer ship it to us so you don't have to chase it down yourself. If there's an OEM, aftermarket, or remanufactured option available, we'll lay out the price, lead time, and warranty details so you can make the call. That whole process is covered in detail in our sourcing guide for hard-to-find parts.
Once the manufacturer's part number is confirmed, go to parts.southeasternequip.com for 24/7 ordering. In-stock orders placed before 2:30 PM EST ship the same day.
Every dollar you spend earns Equipment Rewards points, and those points never expire, so they stack up whether you're ordering one filter or a full hydraulic kit.
Ordered the wrong size? The portal covers the first exchange for free, including shipping.
Not sure if you've got the right number and want a second set of eyes before you hit order? Call us. We're not a bot or a form. We're people who know these machines and will take the time to verify the part before it ships.
If you're running more than one machine, this habit has saved the most time over the years. For each machine, keep a file with:
When something fails at 6 AM on a Monday, that file means your parts call takes two minutes instead of twenty. Your dealer can pull up your machine history and get you to the right part faster.
We're happy to help you build that reference if you're starting from scratch. It's the kind of thing our Parts and Service Sales Representatives (PSSRs) can walk you through on a site visit.
Getting the right manufacturer's part number isn't complicated, but it does require the right information in the right order. Serial number first. Component plate second. Illustrated parts diagram or portal lookup third. Serial number break verification before you finalize.
Skip one of those steps, and you're rolling the dice on whether the part fits.
Need help? Whether you're at the counter, on the phone, or ordering at midnight, we've got you covered at parts.southeasternequip.com, or reach out through our contact page to talk to a parts pro directly.
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