3.7 HP 3450 RPM, 56 Frame, 230V, 17.2Amp, 5/8" Shaft, Single Phase NEMA Air Compressor Motor - EM-04

This was a good replacement for the Kobalt 138336 motor. Despite the obvious 3.7HP rating of the compressor, do not be fooled. The original Century J and O motor is 15 amps, thus the compressor HP rating is false which is why it isn't printed on the motor itself. The 3.7HP motor offered here is over 17 amps. Go by amps, not horsepower! This 15 amp motor powers the pump just fine, reaches cutout pressure without a struggle,runs smooth, no excessive heat buildup. It was great to see an old compressor come to life again when new comparable ones are now $800. $200 vs $800... the math isn't hard.The only cons I can provide at this time is the wiring cover plate has a small hole near the top screw while the original didn't. Even though the pump and motor should be out of the weather anyway, I suggest to make plans to do so.

I was a little hesitant in going with a motor made in the Land of China, but it's distributed through a retailer in Texas that has a good reputation so I did. The alternative was one made in Mexico, so I don't feel too bad. The motor arrived nicely packaged, and in perfect condition. I bolted it to my compressor, hooked up the wiring and installed the pulley and belt and it works great. It is in fact a bit quieter than my previous motor, which must have been going out for a while. No regrets, and a good price too.

Peace of "JUNK" it was installed on an air compressor that was not used very much. it seemed to be ok but after a few months it is DEAD !!! I will not run DO NOT BUY !!!!

Runs smooth does not get hot has plenty of power

Surprisingly low current draw, less than rated and does the job. Good starting torque, quiet, spins the compressor. What else do ya want? Very satisfied.

This motor was great for me. The previous motor I had was "MARKETED" and labeled as a 3.5HP. But it was a 15 amp motor (120V) with a 56 frame. Even though this one says it is only rated at 2HP (actual best calculation I could do came up to about 2.20-2.30HP actual) but is stronger, and seems more efficient, than the supposed 3.5HP motor it replaced. This is not guarantee it will work in your application, but, if the amps and frame match it will likely be a great replacement!

Fits and preforms as it should

So, this motor was a replacement for one of my IR air compressors. The air comp. i have is about $1100.00 The motor went out. I priced a new motor from the factory, $900.00 WTH ! No thanks. O yeah, Granger and McMaster had them as well. ( love McMaster ), but at around $800.00 that was still way too much. Anyhow, this motor for $200.00 is an exact fit and specs, and has been working great for the past few months, It is used 5 days a week. Thanks Amazon.