3.7HP Air Compressor Motor 3450RPM Single Phase - Reversible Shaft

In this review the VEVOR 3.7HP air compressor motor is evaluated for technicians and DIYers who need a direct, high-speed replacement motor for stationary air compressors. The biggest reason to consider it is straightforward: it delivers a 3.7HP, 3450 RPM single phase design with a 5/8' keyed shaft that fits many 56 frame compressor pumps and offers reversible rotation for easier wiring and installation. For users who want a budget-friendly, CSA-tested motor built from rolled steel, this motor answers the basic needs of repair and light industrial use.

Key Features

• 3.7HP 3450 RPM: Provides a high-speed output suitable for many two-pole compressor pumps needing fast shaft rotation.
• Single Phase 230V: Works on common 230V residential and workshop circuits while delivering 17.2A full load current for consistent performance.
• 5/8' Keyed Shaft: The 5/8' keyed shaft with 1.88' length fits compatible compressor couplings for a direct swap without shaft modification.
• Dual Rotation Direction: Reversible CW/CCW rotation simplifies wiring and lets installers match the pump rotation without mechanical changes.
• Open Drip-proof Steel Shell: Rolled steel housing with good heat dissipation is durable when used in clean, dry environments as intended.
• CSA Tested: Certification provides reassurance on safety and basic durability for workshop applications.

Who It's For

This motor is best for technicians, small shop owners, and experienced DIYers replacing or upgrading a 56 frame compressor motor that requires a 5/8' keyed shaft and 3450 RPM speed. It is especially useful when a reversible rotation option is needed to match existing pump direction without extra mechanical work.

It is not ideal for applications exposed to heavy dust, moisture, or outdoor environments because the open drip-proof design needs clean, dry conditions. Buyers seeking ultra-long commercial duty runtimes or specialized industrial certifications should look at purpose-built industrial motors instead.

Pros & Cons

Pros

• Clear fitment for 56 frame pumps with a 5/8' keyed shaft and 1.88' length for direct replacements.
• Reversible CW/CCW wiring reduces installation complexity and incompatibility with pump rotation.
• Competitively priced while carrying CSA testing and a rolled steel shell for good heat dissipation.
• Single phase 230V operation makes it usable in many residential and light commercial shops.

Cons

• Some users report mixed long-term reliability and power endurance, so longevity may vary by operating conditions.
• Open drip-proof construction limits use in dirty or wet environments compared with fully enclosed motors.

Specifications

Model Power	3.7HP
Speed	3450 RPM
Voltage / Amps	230V / 17.2A
Frame Type	56 Frame
Shaft	5/8' keyed, 1.88' length
Rotation	Reversible CW / CCW (factory CCW)
Construction	Open drip-proof, rolled steel shell

Our Verdict

The VEVOR 3.7HP air compressor motor is a practical, value-focused replacement for 56 frame compressor pumps that need 3450 RPM and a 5/8' keyed shaft; its reversible rotation and CSA testing make installation straightforward and reasonably safe. For clean workshop environments where cost and a direct fit are the priority, it represents good value, while users needing industrial duty life or weatherproofing should consider higher-spec alternatives.

Frequently Asked Questions

Will this motor fit my 56 frame compressor pump?
It should fit pumps that accept a 56 frame motor with a 5/8' keyed shaft and 1.88' shaft length, but confirm physical shaft and mounting dimensions before purchase.

Can the rotation direction be changed on site?
Yes, the motor is reversible for CW or CCW rotation and the factory setting is CCW to simplify matching pump requirements.

Is this motor suitable for outdoor or dirty workshop use?
No, the open drip-proof design recommends use in clean, dry environments; exposure to heavy dust or moisture can shorten service life.