How to repack your trailer wheel bearings (and when to bring it in)
Repacking your bearings once a year is a cheap afternoon in the driveway that saves a spindle, and saves you from a wheel passing you on the interstate. Here is the job the way we do it on the bench.
A dry bearing is the number-one reason we see trailers stranded on the shoulder of I-85. It almost never quits without warning. There's a growl at speed, or one hub that's noticeably hotter than the others when you stop for fuel, or a little play in the wheel when you rock it. Catch it early and it's a thirty-dollar fix. Ignore it and you're buying a spindle, or watching a wheel roll off into the median.
Most utility and cargo trailers ride on tapered roller bearings that want fresh grease about once a year, or every 12,000 miles, whichever comes first. Tow a lot, or back a boat trailer down the ramp at Hartwell? Do it more often. Water is the enemy. What follows is that job, start to finish, done on the bench with hand tools you already own.
Rather let us handle it? This is bread-and-butter work for our Service Department, and a dry bearing is not something you want to get wrong right before a long haul. We know exactly what to look for, so we catch the worn race or the tired seal you might miss, repack all four, and check your brakes while the drums are off. If you'd rather just hitch up and go, send us a service request and we'll take care of it.
Before you jack it up
Buy your seals and bearings first. Seals are a couple of bucks and you replace them every single time. They don't reseat once you pry them out. Pull one hub, take the old bearing and the number stamped on it to our parts counter, and match it before you tear the other three apart. L44649 and L68149 cover a huge share of the trailers in our yard, but don't guess.
You'll want:
- A jack and jack stands (never trust the jack alone)
- Wheel bearing grease (marine-grade if you're around water)
- New grease seals, and new bearings and races if the old ones are pitted
- A seal driver or a block of wood, a hammer, channel locks, and cotter pins
Pulling the hub
Chock the good wheels, break the lug nuts loose, jack the axle and set it on a stand. Pop the dust cap off with a screwdriver and a tap. Behind it you'll find a cotter pin through the spindle nut. Straighten the legs and pull it. Back the nut off, and the outer bearing and washer will slide right into your hand. Now pull the whole hub straight off toward you. The inner bearing stays in the hub behind the seal; drive it out from the back with the wood block and the old seal will come with it.
Look before you grease
Wipe everything down and actually inspect it. The bearing rollers should look smooth and honey-colored. If you see blue or purple, that's heat. It got run dry and it's junk. Run a fingernail across the polished race inside the hub; if you feel ridges or see flaking, replace the race and the bearing together as a matched set. Never put a new bearing on an old worn race.
Packing and reassembly
Get a glob of grease in your palm and push the wide side of the bearing into it, working grease through until it comes out the top. Keep going until every gap is full. A bearing packer does this cleaner, but the palm method works. Smear grease on the races in the hub too. Set the inner bearing in, then tap the new seal in square and flush with the wood block. Slide the hub back on the spindle, seat the outer bearing, washer, and nut.
Here's the part people get wrong: don't crank the nut down. Spin the hub and snug the nut just until it barely drags, to seat the bearings. Then back it off to the nearest cotter-pin hole, basically finger tight. A trailer bearing that's torqued like a lug nut will cook itself in twenty miles. New cotter pin, dust cap back on, done.
When to just bring it in
If you pull a hub and find a scored spindle, a bearing welded to the shaft, or brake magnets and shoes behind a drum you didn't expect, stop. A galled spindle isn't a driveway fix. Same if you've got oil-bath hubs or EZ-Lube axles you're not sure how to service. Drop it at our shop and we'll repack all four, replace what's worn, and check your brakes while the drums are off, usually same day.
Ready to trade up instead of fixing? Have a look at what's on the lot.
Ready to shop, or want us to handle it?
Come see us here in Greenville, browse what's on the lot right now, or let our service shop take care of the work.
