Most RV trailer wheel bearings need a full repack every 12 months or 12,000 miles, whichever comes first. That’s the industry standard, and it works for the majority of owners. The right interval for your trailer depends on hub type, load, terrain, and whether your trailer ever backs into water. Here’s how to know when yours are due.
The Standard Interval: 12 Months or 12,000 Miles
A bearing repack means pulling the hub off, cleaning out the old grease, hand-packing the bearings with fresh grease, replacing the seal, and putting everything back together to spec. Every major axle manufacturer (Dexter, Lippert, and the rest) sets the same baseline: every 12 months or 12,000 miles, whichever comes first. That’s the rule.
Most owners track the mileage and forget the calendar matters just as much. If you only put 3,000 miles on your trailer in a year, the service still comes due. Grease breaks down whether you’re rolling or parked. After a year of sitting in Michigan weather, it’s not the same grease you packed in.
What Changes the Interval
Some conditions shorten the schedule. Six months instead of twelve is a reasonable plan when any of these apply:
- Water exposure. Boat trailers, lakeshore launches, towing through standing water. On a non-E-Z Lube hub, water inside the hub means a repack right after, not at the next interval.
- Heavy loads. Towing at or near GVWR runs the bearings hotter, and hot grease breaks down faster.
- Long trips and mountain grades. Sustained highway speed and downhill braking generate a lot more hub heat than short local hauls.
- Salt and road treatment. Michigan winters do their own damage. Salt during off-season transport, or outdoor storage near treated roads, accelerates corrosion inside the hub.
- Storage outside, uncovered. A trailer left in the open through one of our winters sees faster grease breakdown than one stored under a cover or in a heated garage.
If your trailer regularly checks more than one of these boxes, plan on a repack every six months.
Hub Type Matters: Standard, E-Z Lube, or Oil Bath
Three hub designs are common on towable RVs, and each has its own maintenance pattern:
Standard hubs require full disassembly at every interval. Pull the hub, remove the bearings, clean off all the old grease, hand-pack fresh grease, replace the seal, torque it back together.
E-Z Lube hubs (Dexter’s design and similar systems) have a zerk fitting at the end of the spindle that lets you push fresh grease through without taking anything apart. That’s useful between services, but it does not replace one. The bearings still need to come out and get cleaned and repacked at the 12-month or 12,000-mile mark. If the trailer goes in water, sooner.
Oil bath hubs are less common on towable RVs. They show up on some larger fifth wheels and commercial trailers. These get a visual oil-level check and periodic oil changes instead of a grease repack. Interval depends on the spec for your specific hub.
Not sure which you have? Pull a dust cap. A zerk fitting means E-Z Lube. An oil-level window means oil bath. Anything else is a standard hub.
Signs You Need a Repack Sooner Than Scheduled
Some signs mean repack now, not at the next scheduled service:
- Hub heat after a drive. Warm hubs are normal. A hub too hot to hold your hand on after a short tow means something is wrong.
- Wheel wobble or play. Jack the trailer up and grab the tire at 12 and 6. Any noticeable rocking points to bearing wear or loose adjustment.
- Grinding, growling, or humming that gets louder with speed.
- Grease leaking past the seal onto the back of the wheel or the brake assembly.
If any of these show up, don’t wait for the next service window. For a closer walk-through of what to look for, our guide to inspecting and maintaining RV trailer bearings covers the visual inspection in detail.
What Skipping a Repack Actually Costs
When a bearing fails, the damage usually doesn’t stop there. A seized bearing heats up the hub. The hub damage spreads to the spindle. Spindle damage can mean a full axle replacement. We’ve seen single missed services in our shop turn into multi-thousand-dollar repairs that should’ve been a $200 repack.
There’s also the safety side. A bearing that fails at highway speed can lock a wheel or separate it from the axle. That’s a tow truck on I-94 at best.
DIY vs. Professional RV Trailer Bearing Service
A repack is a job a comfortable owner can handle. You need a torque wrench, a safe way to support the trailer, a bearing packer (or strong hands), the correct replacement seal for your hub, and the patience to clean every trace of old grease before repacking. If you’ve got those things, you can do it in an afternoon.
Bring it to a shop if you’ve never done one before, if you suspect bearing or spindle damage, if you have E-Z Lube hubs and want a full service rather than a zerk refresh, or if you tow heavy and want brakes and seals checked at the same time.
If you’re due, our team handles bearing repacks, seal replacements, and full axle service as part of professional RV trailer repair in West Michigan. We work on RV, utility, and cargo trailers across the lakeshore.
FAQ
How often should I repack my RV trailer bearings?
Every 12 months or 12,000 miles, whichever comes first. That’s the standard manufacturer recommendation from Dexter, Lippert, and most other major axle makers. Trailers exposed to water, heavy loads, or salt should be serviced every six months instead.
Can I repack bearings myself, or do I need a professional?
You can repack bearings yourself if you have the right tools (torque wrench, bearing packer, replacement seals) and you’re comfortable with hub disassembly. Bring it to a shop if you’ve never done it, suspect damage, or want brakes and seals inspected at the same time.
What’s the difference between E-Z Lube and standard hubs?
E-Z Lube hubs have a zerk fitting that lets you push fresh grease through the spindle without disassembly. Standard hubs require full removal and hand-packing every service. Both types still need a complete repack every 12 months or 12,000 miles. The zerk is for supplemental greasing only.
How do I know if my bearings are about to fail?
Watch for hub heat after a drive, wheel wobble when jacked up, grinding or humming sounds at speed, and grease leaking past the seal. Any of those means the bearing needs attention now, not at the next scheduled service.
What grease should I use to repack RV trailer bearings?
A high-temperature wheel bearing grease rated for trailer or marine applications. Lithium-complex is the most common formulation. Don’t mix grease types. If you switch brands, clean every trace of the old grease out first.
How long does a professional bearing repack take?
A single-axle trailer typically takes 1 to 2 hours. A tandem-axle trailer takes 2 to 4 hours, depending on brake inspection and any parts that need replacement.
Can I just add grease through the E-Z Lube zerk instead of repacking?
No. The zerk is designed for supplemental greasing between full services, not as a replacement. Pumping fresh grease through doesn’t remove old, broken-down grease or let you inspect the bearing for wear. A full repack is still required at the 12-month or 12,000-mile mark.