The 6-Step LEESON Motor Ordering Checklist That Saved Me $2,100

I handle motor and drive orders for a packaging plant in the Midwest, a job that sounds easy until a production line is down and someone hands you a greasy motor with no paperwork. Since 2017, I've personally made—and documented—more preventable ordering mistakes than I'd like to count, totaling roughly $2,100 in wasted budget. This is the checklist I now use before every LEESON motor order. Six steps. Ten minutes. Most of the steps exist because I learned the hard way.

Use this checklist when you're replacing a motor yourself: a LEESON 5 hp electric motor, a small gear motor, or anything that has to bolt onto existing equipment. If you're not sure what a VFD is yet, that's fine—step 6 covers it.

1. Photograph the nameplate first

The nameplate is the single source of truth. A lot of us skip this because we assume the model number is already written down somewhere, or that we will remember it. I've made that mistake. In September 2022, I ordered a replacement without checking the frame on the old unit. I remembered it as a 5 hp motor and grabbed the closest catalog number I could find. It was the wrong frame. That was $480 in restocking fees and a week of downtime.

Checkpoint: take a legible photo of the nameplate. If it's too greasy, clean it first. The catalog number and frame size are the two things you cannot fake from memory.

2. Use the LEESON motor catalog to confirm, not to guess

The LEESON motor catalog looks approachable, but it hides more than it shows. Once you know the frame size and duty, the catalog pages—especially the PDF versions with wiring diagrams—help you narrow down the exact part number. They also show base-mounted versus C-face motors, shaft options, and accessories.

The trap is searching by horsepower alone. I've done it too many times. A 5 hp electric motor can come in a 143T, 145T, 182T, or 184T frame, and those are not interchangeable. Bolt patterns and shaft heights are different. It took me about four years and a crate of wrong motors to understand that the catalog number is the contract; the description is just marketing.

Put another way: use the catalog to double-check the part number against the old nameplate, then move on. If the part number looks current, fine. If you're not sure, call your distributor and read out the full model string—do not say, just give me the 5 hp one.

3. Measure shaft and mounting dimensions before ordering

From the outside, motor replacement looks like a parts-swapping exercise. The reality is that same brand and same horsepower don't guarantee the same shaft height or shaft length.

A LEESON 5 hp electric motor with a standard NEMA frame usually matches the original if the frame is right, but verify anyway. A caliper check takes two minutes. Look at shaft diameter, shaft length, keyway width, and the distance between mounting holes. I had an order in 2021 where the motor was electrically perfect and mechanically wrong: the shaft was an eighth of an inch shorter, so the pulley didn't line up with the driven pulley. The supplier offered an exchange, but return shipping and downtime turned a $700 motor into a $1,000 lesson.

If you're replacing a motor with an unusual mounting—say, a C-face with a specific pilot diameter—measure that too. At least, that's been my experience with older equipment in our building.

4. Do the V-belt cross-reference before installation

If the motor drives a pulley, the phrase v belt cross reference is your friend. A V-belt is defined by its section (A, B, C, 3V, etc.) and its length, but the real-world fit depends on the center distance between the two shafts. A new motor can sit higher or lower than the old one, which changes that center distance.

In 2020, I installed a replacement motor that was fine on paper, then found the spare belt no longer reached. We spent half a day trying different lengths from a local supply house. The belt itself was cheap; the downtime was not. What I mean is: before you order, measure the center distance and write down the belt section. Cross-reference charts can tell you that a B50 replaces a B49 in some cases, but they cannot tell you if your particular pulleys will line up.

5. Check whether you're connecting with a gear coupling

Not every motor shaft connects to a pulley. Some motors connect to a pump or gearbox using a gear coupling, which is a two-part hub with external teeth and a sleeve that carries torque while allowing some misalignment. Gear couplings are forgiving in theory, but unforgiving in bore size.

If you're replacing a gearmotor, the gearbox input might have a female bore matched to the old motor shaft. If the new motor shaft is a different diameter, a new motor might still be the right product—but you will need a different coupling or bushing, and that has its own lead time. Check the gear coupling bore size before you sign off on the motor order.

(Note to self: actually update my coupling notebook this quarter. I dug in after the last mistake and there were at least two entries I need to fix.)

6. Decide if you need a VFD before you order

This one doesn't show up on a motor nameplate, but it changes your purchase. So, what's a VFD? A variable frequency drive (VFD) controls the speed of an AC induction motor by changing the frequency and voltage supplied to it. In plain English, it lets you run a motor at 600 rpm when it is rated for 1,800 rpm.

If the old setup ran at one fixed speed and always will, skip this step. But if you need adjustable speed—on a conveyor, pump, or fan—the motor should be rated for inverter duty. LEESON lists many models as inverter-ready. The reason matters: a VFD sends voltage spikes that can stress standard motor insulation over time. You might get away with a general-purpose motor for a while, but on a 24/7 production line, I don't like gambling with a $900 motor and a $600 drive.

Checkpoint: is speed control in your future? If yes, pick a motor rated for VFD use and order the drive at the same time.

What I still want you to avoid

No checklist catches everything, but these are the traps I keep seeing in our trade:

• Ordering a motor by memory instead of by nameplate. The supplier doesn't know what you took off the machine; they only know what you type into the quote request.
• Ignoring the enclosure type. TEFC, ODP, explosion-proof, and washdown motors are built for different environments. A dusty grain area is not the same as a climate-controlled workshop.
• Forgetting to confirm rotation direction on three-phase motors. That mistake costs a phone call and a bit of professional pride.
• Being shy about small orders. If you need one $200 motor and the distributor acts like you're wasting their time, find a different distributor. When I was starting out, the suppliers who helped me with a single motor are the ones who get my larger orders now.

Looking back, I should have adopted the nameplate-photo habit on day one. At the time, I thought it was unnecessary—it felt like extra caution for people who didn't know motors. In reality, the people who know motors are the ones who check the details first.

This checklist has caught at least 47 potential errors for our team in the past 18 months. That's 47 production disruptions I didn't have to explain to my manager. If running it once saves you from one bad order, that's a decent trade.