4 Things to Check Before You Order Another Motor (A Buyer's Checklist)

I've been handling motor purchasing for a mid-size manufacturing company for about 4 years now. Roughly $200k annually across maybe a dozen vendors. I'm not an engineer—I'm the person who has to make sure the 5hp motor the maintenance team needs actually fits, arrives on time, and doesn't cause a headache for accounting.

If that sounds familiar, this checklist is for you. It's based on the mistakes I've made (and watched others make) when ordering anything from a Leeson Washguard motor for a washdown application to an industrial servo actuator for a new production line. It's not comprehensive—motor selection is a deep technical topic. But it covers the 4 things I check on every single order now.

Step 1: Verify the Physical Specifications—Not Just the Nameplate Ratings

This sounds obvious, but I've tripped over it more than once. You look at the product page for a Leeson 5hp motor, see 5hp, 3450 RPM, 230/460V, and think "great, that's what we need." But there's more to it.

Check these specifically:

• Frame size. A 5hp motor might come in a 184T or a 213T frame. They're not interchangeable. Measure your existing motor's frame, or check the nameplate. This is the #1 mistake I've seen across different maintenance teams.
• Mounting configuration. Foot-mounted? Flange-mounted? Face-mounted? I ordered a replacement servo motor once and didn't specify the mounting—turns out the original was foot-mounted and the replacement was a face-mount variant. That cost us a week and a custom adapter plate.
• Shaft dimensions and keyway. Shaft diameter and length can vary. A 7/8" shaft vs 1" shaft means the pulley or coupling won't fit. We ate $400 on a special-order motor because I assumed shaft dimensions were standard—they weren't for that particular series.

I should add: if you're cross-referencing an old motor, Leeson has good documentation. But "check the cross-reference" isn't the same as "verify the physical specs match." Don't skip this.

Step 2: Confirm the Application Environment—This Is Where Most Oversights Happen

I've learned this one the hard way. A motor that works perfectly in a dry assembly area might fail within months in a washdown environment, a dusty grain mill, or an outdoor location.

Ask yourself (or ask the person requesting the motor):

• Is there water, steam, or chemicals? A Leeson Washguard motor is designed for that. A standard TEFC (Totally Enclosed Fan Cooled) motor might not last. We put a standard AC motor near a parts washer once. It lasted 14 months. The Washguard replacement is going on year 3 now.
• Is there explosive dust or gas? You'll need a motor with appropriate hazardous location ratings. That's a different conversation.
• What's the ambient temperature? Motors are rated for specific ambient temperature ranges. A standard motor in an unventilated hot area will experience reduced lifespan or even trip thermal overloads.
• Is precise positioning needed? A standard induction motor won't work for indexing or positioning. You'll need a servo motor (or stepper motor if the load and accuracy requirements are modest). We use electric servo actuators on a packaging line—they're not interchangeable with a general-purpose motor.

At least, that's been my experience across food processing, assembly, and packaging environments. If you're in a heavy industrial setting like mining or steel, the considerations might be different.

Step 3: Check Lead Times and Availability—Before You Finalize the Purchase Order

Here's a mistake that made me look bad in 2023. I found a great price on a Leeson 5hp motor, processed the PO, and waited. And waited. The lead time was 12 weeks—I hadn't noticed. The maintenance team had arranged the changeover for 4 weeks out. That was an awkward conversation with my VP.

Now I check 3 things before even sending the PO:

• Is it in stock? Distributors like Motion Industries or W.W. Grainger often have different stock levels. If it's factory-direct, ask about current production lead times. Quoting "6-8 weeks" is different from "we have 3 in stock in the Chicago warehouse."
• Are there comparable models? If the exact Leeson model is backordered, is there a functionally equivalent model from the same line that's available? The maintenance team might prefer the exact model, but 4 weeks' delay matters more than specific bearing brand.
• What about accessories? VFDs, encoders, brakes, conduit boxes—if you need them, verify they're also available. Ordering a servo motor but the encoder cable has a 3-week lead time? That's a separate order and a separate delay.

This worked for us after that 2023 incident: I now ask for availability confirmation in writing before the PO. Simple email. But it saves me from taking engineering's word that something "should be available."

Step 4: Verify Documentation and Support—This Separates Good Suppliers From Frustrating Ones

This might seem like a soft consideration when you need a motor yesterday, but I've learned it matters. A lot.

Here's what to confirm before choosing a vendor:

• Wiring diagrams and connection data. Not all motors come with clear documentation. Leeson is generally good about this, but I've received motors from other brands with a single-page instruction sheet that's barely legible. If you're installing it yourself, you need a proper wiring diagram.
• Technical support. If the motor arrives and something doesn't make sense—the terminal box is on the wrong side, the rotation direction is opposite, there's a vibration—can you call someone? We had an issue with a servo motor tuning once. The vendor's tech support walked us through parameter changes. Saved us days of troubleshooting.
• Cross-reference capability. If you're replacing an old motor, can the vendor help you find the right Leeson (or other brand) equivalent? Some distributors have good cross-reference tools. Some expect you to figure it out.

The vendor who said "this isn't our strength—here's who does it better" earned my trust for everything else. Motor sourcing is a technical field. I'd rather work with a specialist who knows its limits than a generalist who overpromises. We use a distributor that focuses on industrial motion control now—they won't try to sell you a stepper motor when the application clearly needs a servo.

Two More Things I've Learned (Should Mention These)

1. If you're not sure whether it's a stepper or servo motor—and you need precise control—lean servo.

We get asked "what stepper motor should I use for X?" fairly often by internal teams. Steppers are cheaper and simpler for certain applications. But if the load varies, or if you need high speed, or if you can't tolerate lost steps, a servo motor is the safer choice. The upfront cost is higher, but the troubleshooting cost of trying to make a stepper do something it's not designed for is higher.

2. Keep a standard spec sheet for your most common motor purchases.

We didn't have a formal specification process for rush orders. Cost us when an unauthorized frame size showed up on the invoice. Now, for our three most common motor sizes (1hp, 5hp, 10hp), I have a pre-filled checklist: voltage, enclosure type, frame size, mounting, environment. It takes 5 minutes to fill out but saves hours of back-and-forth with suppliers.

Prices as of January 2025 for reference: A Leeson 5hp, 184T, TEFC motor typically runs $400-$600 depending on enclosure and efficiency class. A Washguard 5hp is usually $600-$900. Electric servo actuators are a different world—$800-$2,500+ depending on type and specs. Verify current pricing with distributors.

Motor buying isn't complicated, but it's full of small details that matter. This checklist won't replace engineering judgment, but it'll catch the ordering mistakes that waste time and budget.