Easiest Way to Install Grease Caps on Trailer Hubs

Updated 07/20/2011 | Published 07/19/2011

Products Featured in This Question

Grease Cap - 1.988" Outer Diameter - Drive In

(2252)

$3.74

Dust Cap Driver Tool - Small - for 1.986" Grease Caps

(155)

$44.80

Dust Cap Driver Tool - Medium - for 2.440" OD Grease Caps

(52)

$42.24

4" Carbon Fiber Digital Caliper

(26)

$12.34

Question:

Is there any special technique for installing a grease cap on the end of the axle? I tried tapping one on it wasnt threaded, but it fell off after a short drive. Do you really have to bang it on hard, to the point of deforming the cap a bit?

asked by: Brian

Expert Reply:

The grease cap should driven in so that it is fully seated. We offer a grease cap driver tool that can be used to drive in the cap without deforming it.

The drivers are offered in three sizes: 1.986 inch diameter part # 290-991, 2.440 inch diameter part # 290-992 and 2.72 inch diameter part # 290-993.

To view a product demonstration video of the grease cap driver, click on the provided link.

You'll also want to make sure you're using the correct grease cap. Use a digital caliper like # PTW80157 to measure the inside diameter of the hub bore. The outer diameter of the grease cap you choose should closely match the inside hub bore diameter.

expert reply by: Mike L