12 Steps To Repacking Or Replacing Your Bearings

By Pat Piper
Published: Fall 2013

Step 6:

Photo of getting the races out of the tire hub

Getting races out of the hub requires placing a round punch placed against the inside edge of the race and, with small taps with a hammer, moving in a circular motion to dislodge it from the hub. The inner race is removed with the outer sidewall facing you and the outer race is removed with the inner sidewall facing you. Some folks use a wooden dowel instead of the round punch. Whatever you choose, wear eye protection. Place a new race on the hub and with a soft hammer, pound the race all the way in with a circular motion so that its outer edge is flush with the hub. Others position the old race above the new one and pound it in that way. There's even a race insertion tool available at auto-parts stores. You'll know it's in the proper position because it won't go in any further and the sound will change when properly seated.

Step 7:

Photo of using a bearing packer to pack the inner tire hub with grease

Grease the inner hub and then pack the inner bearing with grease. Legendary Trailers uses a bearing packer (pictured), which can be found at most auto-parts stores for less than $15. Another way is to put grease in the palm of your hand and then place two fingers of your other hand through the larger side of the bearing. Now pack grease into the bearing rollers while rotating the bearing into your palm. You'll do the same with the outer bearing later.

Step 8:

Photo of installing a double-lipped grease seal

Now install the new and double-lipped grease seal. Double-lipped grease seals have a better chance of keeping water out of the bearing assembly than single-lip seals. It's usually included in bearing kits so be sure to ask or do some research prior to buying. The kits sold at West Marine from CE Smith have double-lip seals. Many prefer using a board across the seal to hammer against, thus protecting the seal. You have now completed the inner bearing assembly!

Photo of lifting the tire wheel onto the spindle

Step 9:

Turn the wheel over and install the outer race. Then lift the wheel onto the spindle being careful not to poke the grease seal with the spindle's outer edge. Grease the race and add the outer bearing.

Step 10:

Photo of tightening the spindle washer and axel nut

Next, add the spindle washer, the axle nut/castle nut tightening until it stops. Bo Adams, vice president of CE Smith (they make bearings for West Marine), says the nut "should be a snug fit" but if too tight, the assembly can be damaged as a result of heat generated when the trailer tires are going down the road. If too loose, the wheel will wobble. Finally, add the castle nut or the castle-style axle washer.

Photo of putting a new cotter pin on the assembly

Step 11:

Now put a new cotter pin on the assembly, turning both ends in the same direction to lock it in place.

Photo of adding the dust cap

Step 12:

Add the Bearing Buddy or dust cap and spin the wheel. You shouldn't hear any sound except your own voice saying, "Yes!"End of story marker

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What You'll Need

  • A jack and a stand
  • Boat-trailer bearing kit with the proper size bearings, races, and a double-lip grease seal. NOTE: Bearing kits are usually one of five sizes: 3/4", 1", 1 3/8", 1 1/4", 1 1/16". If unsure, each bearing and race has a stamped part number.
  • Bearing Grease — Don't mix different brands
  • A large flat screwdriver, needle-nose pliers, a lug wrench or channel locks
  • A hammer and a soft hammer (made with brass and designed not to damage surfaces upon impact)
  • Goggles and gloves

Four Signs Of Bearing Wear

1. The hub feels hot to the touch during refueling stops on the highway. This can also be the result of a brake shoe or brake pad rubbing while traveling.

2. There is grease on the bottom of the boat hull near the trailer wheel or grease on the trailer frame near the trailer wheel.

3. Obvious noise is heard when spinning the wheel while it is jacked up.

4. If the usually reliable dust cover suddenly comes off, this can be the result of excessive heat and pressure buildup in the bearing assembly.


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