How To Determine Which Replacement Trailer Hub Grease Caps are Needed For Boat Trailer

Updated 12/06/2010 | Published 12/03/2010

Question:

I purchased a 1987 boat trailer that is missing a grease cap and having difficulty in finding a replacement for it. According to the registration it is a Make colom Model is a Shoreline the measurement is close to 3 inches in diameter

asked by: Rich B

Expert Reply:

The Fulton Grease Cap, part # F001609, is the closest grease cap I will have to 3 inches. The flange diameter on the cap measures 3.125 inches. The overall height is 1.31 inches.

There are 2 ways to determine which replacement grease cap you will need. The first would be to measure the inside diameter of the hub where the grease cap install with a dial caliper and then match up measurement to replacement grease caps (see link).

The other way would be to remove your hub assembly from the trailer and look to see what bearing and seal numbers you have.

If you can send me the inside diameter measurement or the bearing and seal numbers, I can recommend the correct replacement grease cap.

I have linked a page to our replacement grease caps.

expert reply by: Reno H