How to Measure Spindle and Hub to Select Replacment Oil Seal

Updated 03/20/2017 | Published 03/17/2017

Question:

Working on a 1996 Dorsey Trailer with UFP hubs. Unsure of axle capacity. Inner Bearing 25580 Outer Bearing LM67048 No part number on seal, although I know it does NOT take CR 21352 or CR 21302 or Dexter 010-001-00 Numbers from UFP Hub say HD 750 and Discard PT.12.090 Tried to measure outside of seal and believe it is close to 3.25 and inside 2.1 Picture attached ... many more pictures available. Can you help me identify the applicable seal? Thanks in advance.

asked by: Mark

Expert Reply:

I linked our main page for trailer hub oil seals. You can select a new oil seal by taking precise measurements of both the spindle and hub bore. The spindle measurement will tell you the required inner diameter and the hub bore measurement will tell you the required outer diameter. You'll want to use a precision digital caliper to get your measurements to the nearest thousandth of an inch, like 1.234-inches as an example. Please refer to the linked photo diagram for point B which is where to measure to determine the seal inner diameter. Then use the linked page to choose your seal.

expert reply by: Adam R