US Motors Motor Cross Reference
US Motors Motor Cross Reference - WorldWide Electric & NAE Equivalents
US Motors (Nidec) owns a huge installed base in vertical pumping - their HOLLOSHAFT® vertical motors sit on turbine pumps and pivots across Texas, alongside general purpose and oil-field lines. Vertical crosses take one extra spec (thrust); everything else follows the standard five-point match.
The Five-Point Cross
| Check | From the Old Nameplate | Must Match? |
|---|---|---|
| HP & RPM | Rated power and full-load speed | Yes - same HP (or one up), same pole count |
| Frame | NEMA frame number (e.g. 184T, 326T) | Yes - frame match = bolt-in fit |
| Voltage / Phase | e.g. 230/460V, 3φ, 60 Hz | Yes |
| Enclosure | ODP, TEFC, TEXP, washdown | Yes, or upgrade |
| Service Factor & Design | SF 1.15, NEMA Design B typical | Equal or better |
Because both brands build to NEMA MG-1, a frame match guarantees the mounting dimensions - details in our frame size chart and nameplate guide.
Where US Motors Lines Typically Cross
| US Motors Line | Duty | Our Equivalent Series |
|---|---|---|
| Vertical hollow shaft (HOLLOSHAFT®) | Deep-well turbine, irrigation | VHS Motors (10–500 HP) · WPI |
| Vertical solid shaft / P-base | Booster, inline pumps | Call with base & shaft specs |
| Oil well pumping (Design D) | Beam pump jacks | Oil Well Pump Motors |
| General purpose / premium | Industrial TEFC/ODP | Premium Efficient · Integral TEFC |
| Fire pump / listed | Per listing | Matched case-by-case to listing |
| Farm duty & 1φ | Ag equipment | Single-Phase TEFC |
Crossing a Vertical Motor
For VHS crosses, record from nameplate and pump data: HP, RPM, thrust rating (lbs), base diameter (BD), coupling style (standard or non-reverse ratchet), and enclosure (WPI vs TEFC). The replacement's thrust bearing must meet or exceed pump downthrust - that number governs bearing life more than anything else. Couplings and bases are stocked when the swap needs hardware.
Oil-field crosses: match Design D slip class on beam pumps - a Design B general purpose motor is not a substitute on cyclic pumping load, whatever the frame says.
Frequently Asked Questions
What replaces a US Motors HOLLOSHAFT vertical motor?
A vertical hollow shaft motor matching HP, RPM, base diameter, thrust rating, and coupling type - stocked from 10 to 500 HP in WPI enclosures. Non-reverse ratchet requirements and headshaft details come off the pump data.
Where do I find the thrust rating for the cross?
Ideally the pump manufacturer's data sheet (total downthrust at design point). Some motor nameplates list thrust; otherwise the pump's bowl assembly and setting depth determine it - bring those numbers and we calculate with you.
Can you cross US Motors pump-jack motors?
Yes - oil well pump motors in NEMA Design D high-slip designs cross on HP, RPM, frame, and voltage. Match the slip class; that's the property protecting your gearbox on cyclic load.
Do vertical motors interchange across brands like horizontal NEMA motors?
Largely yes at the P-base/BD interface - vertical standards define base diameter and coupling patterns. The added variables are thrust capacity and ratchet options, which must be matched deliberately rather than assumed.
What about US Motors general purpose TEFC units?
Those cross exactly like any NEMA motor - five nameplate points to an equivalent premium efficient or standard TEFC. In-stock equivalents ship same or next business day.
Related Resources
Send the US Motors nameplate - we'll return the cross and price.
Most in-stock items ship same-day; call to confirm availability and freight.
Call (888) 203-2358All manufacturer names, brand names, and part numbers are trademarks of their respective owners and are used for identification and compatibility reference only. Texas Belting & Supply is not affiliated with these manufacturers. Replacement suitability should be confirmed against the original nameplate - call (888) 203-2358 and we will verify the cross before you order.