How and Where to Measure to Find a Replacement Grease Cap for a Trailer

Published 08/28/2015

Question:

How I should messure the grease cap? Its the inside diameter or outside? I have a Jayco Jay series model year 2009

asked by: Vivian G

Helpful Expert Reply:

You would measure the outside diameter of a grease cap or the inner diameter of the hub bore where the grease cap installs. But the measurement has to be as accurate as possible so you would need to use dial or digital calipers to take the measurement.

Another option is to get at least the outer bearing number stamped into the side of the bearing. You should be able to see it without removing the hub by wiping away the grease. I have included a link to our grease cap main page for you as well.

expert reply by: Michael H