Tech Tip – The Importance Of Properly Greasing The Air Motor On The Transfer Pump

Category: Spray Foam Contractors, Tech Tips   Posted by: demilec

Have a sluggish transfer pump? Does it seize on you? Chances are, it’s not being maintained properly. Many people lube the air motor potion of the pump with lithium grease that causes it to become extremely dry and sticky. This results in a slow drag on the up stoke and down stroke that can lead to feed problems or pressure imbalances. Correct this problem by using a synthetic marine grease such as Mobil SHC 100. Apply liberally around o-rings and inside the air cylinder.

As always read, understand and follow all instruction manuals and warning labels supplied with all equipment. Only trained and qualified personnel should perform repairs on the equipment. To access the latest equipment manuals visit


John P. Kuchta, Jr. July 1, 2012 at 6:21 am Reply

We’ve always used “Marvel Mystery Air Tool Oil “in the air lines leading to the transfer pumps and spray gun.

Just a good squirt in the AM before operations commence will greatly increase life of all components.

Chris July 1, 2012 at 8:30 am Reply

What does it mean when the pumps get stuck midcycle and theyre doing nothing but pissing air until the next pump rotation kicks in? I find I have better luck with IPM than Graco.

Leave a Comment

items marked with * are required