About Us    Contact Us

Which way to turn pump?

Published Categorized as Uncategorized No Comments on Which way to turn pump?

by Alan
(Rochester, NY)

Which way does the pump turn on a 1938 Scaiffe air compressor?

This is the pump from a compressor with a 20-gallon receiver, manufactured in 1938 by Scaiffe & Sons. I am rebuilding the compressor and have come across a question to which I seem unable to find the answer in this website; I apologize if I’ve simply overlooked it. (Despite its age, the system is in good condition; it has not been used for 50 years, and was stored in a dry, heated room throughout. I’ve already had the receiver hydrostatically tested to 200% of its service pressure.)

1938 Scaiffe air compressor
1938 Scaiffe air compressor

I need to replace the motor in the system because the original motor is (the only part that’s) missing. Here’s the question:
In which rotational direction should the pump turn when driven by the motor? I’m unable to determine the correct rotation by cycling the pump by hand; I seem to get compressed air out of the outlet regardless of in which direction I turn the V-belt pulley.

Which way should the motor drive the pulley as it is depicted in the photograph: clockwise, or counterclockwise?

Many thanks for your help.


Which way to turn pump?
by: Anonymous

It turns CCW so that the blades on the pulley blow air across the compressor for cooling.

By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

Notify of
Inline Feedbacks
View all comments