Drum Motor Interroll FAQ: What to Check Before You Need an Interroll 1700 in a Hurry

If you're reading this because a conveyor just stopped and the maintenance manager is pacing behind you, you're in the right place. I've spent the last five years coordinating expedited conveyor component orders for a systems integration company. I've handled over 200 rush jobs, including same-day turnarounds for Interroll drum motors. This isn't a complete product guide. It's the FAQ I wish every buyer asked before making that urgent phone call.

What's the difference between a drum motor Interroll and a conventional gearmotor?

In a conventional gearmotor, the motor and gearbox sit outside the drum, and the drive is transmitted through a chain, belt, or coupling. In an Interroll drum motor, the motor and gearbox are inside the drum shell. The exterior is one rotating cylinder. For a conveyor line, that means a more compact side profile, fewer exposed moving parts, less dirt collection, and easier washdown.

That doesn't mean a drum motor is automatically the right choice for every application. Voltage, speed, torque, shaft configuration, and mounting all still need to match. In my opinion, the drum motor's advantage is most visible when you need a clean, modular conveyor and want to minimize maintenance points.

I found Interroll 1700 on a drawing. Is that enough to order?

It's a start, but not enough. The Interroll 1700 series covers multiple drum motor variants. One unit may have a different drum diameter, face width, voltage, frequency, or mounting flange than another. If you call a distributor and only say “Interroll 1700,” they'll have to ask you several questions.

• Full part number from the nameplate, if you can read it
• Drum diameter and face width
• Voltage, phase, and frequency (for example 230V/50Hz or 400V/60Hz)
• Surface speed in m/s
• Shaft diameter and mounting flange details
• A photo of the old unit

According to Interroll's product documentation on interroll.com, the nameplate is the fastest way to identify the exact drive. If the plate is missing, send photos of the motor from several angles. The twenty minutes you spend documenting the unit can save you an expensive emergency freight charge.

Can I get a drum motor Interroll shipped overnight?

Sometimes, but only if the exact unit is physically in stock at a nearby distributor. In North America and Europe, common Interroll models can move overnight if the part number matches. If the motor has a special voltage or a non-standard shaft, overnight is usually not realistic.

In March 2024, Eddie, a maintenance manager at a distribution outlet, called at 9 PM because his Interroll 1700 drive had failed. We found a matching unit at a distributor about 200 miles away, paid around $480 in freight and late pickup fees, and had it installed by 7:30 the next morning. The cost hurt until he told me the line was losing about $12,000 per hour of downtime.

My advice: don't ask “do you have Interroll parts?” Ask “do you have the exact part number in stock?” The stock check takes two minutes. This is where having a distributor relationship before an emergency matters.

Why do Interroll drum motors cost more than generic replacements?

I used to think the higher purchase price was mostly for the nameplate. In Q3 2024, we collected quotes for three similar drum motors and found the generic option was 15-30% cheaper on the invoice. But as we compared them side by side, the differences showed up in details: a lower ingress protection rating, slightly looser mounting tolerances, less consistent documentation, and noticeably higher noise on the test bench.

In my experience, total cost of ownership is what matters. A generic motor can be a good fit in low-duty applications, but if the drive is on a critical line, the cheaper purchase price can disappear after one extra changeout. Interroll's modular platform also means the replacement part is likely to match the existing mounting and control setup, which is worth something when a machine is down.

Do I need a washdown-rated Interroll drum motor?

If the conveyor runs in a food, beverage, or high-pressure cleaning environment, yes. Ingress protection (IP) ratings tell you how well the motor resists dust and water. A standard IP54 unit handles dry environments and occasional splashes. An IP66 or IP69K rated washdown drum motor is designed for high-pressure cleaning and more aggressive chemicals.

That doesn't mean you should buy IP69K for every application. You pay a premium for washdown-rated seals. For a dry parcel or general manufacturing line, standard protection is usually enough. Ten years ago, many food lines still used external gearmotors with stainless steel covers. Today's modular drum motors make clean-in-place design easier. The fundamentals haven't changed though: bearing protection, shaft sealing, and the right lubricant still decide how long the unit lasts.

Is it a good idea to buy a used or refurbished Interroll 1700?

For a temporary fix, maybe. For a permanent repair, I'd be cautious. Used drum motors can have the wrong voltage, worn bearings, or unknown grease condition. If the nameplate has been painted over, you're essentially guessing what you're installing.

We once had a client buy a used 1700 because it was cheaper and available immediately. It failed after three weeks, and the emergency replacement cost more than a new unit would have cost in the first place. I still kick myself for not saying no more firmly. If you do consider a used unit, ask the supplier for electrical test results, insulation resistance readings, and a load test report. If they can't provide that, pass.

What customs paperwork slows down an urgent drum motor shipment?

Usually it's the Harmonized System (HS) code. Drum motors are generally classified under chapter 8501 (electric motors), but the exact subheading depends on output power and whether the motor is DC or AC. If the code is wrong, customs clearance can add two or three days to a shipment. You also need an accurate commercial invoice and any certificate of origin required by the destination country.

In a true emergency, use a freight forwarder who already knows your account and the product category. I've seen a drum motor sit in customs because the broker declared it as a “motor part” instead of a “motor.” That was an easy two-day mistake to avoid.

How can I stop needing emergency drum motor orders?

Put a spare on the shelf for every critical conveyor. If that sounds expensive, compare it to a shutdown. When a motor fails, the repair cost is more than just the replacement part: you pay for the service call, the freight, and lost production time. A $1,800 drum motor can look very small next to one hour of downtime.

Also, keep a spare part file for the Interroll 1700 units you use. The file should include the exact part number, a photo of the nameplate, and the date of installation. Set up a reminder to review spares every two years. What was best practice in 2020 may not apply in 2025: modular drive platforms now mean you can often stock a drive section instead of a whole conveyor. But the basics—voltage, torque, shaft dimensions—haven't changed. The people who avoid panic are the ones who have the part number on hand before the phone call.