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Check grease levels at a glance with the blue auto-check ring. Chrome plated Bearing Buddies maintain light grease pressure inside the hub to protect your bearings, even when submerged, while the zerk fitting makes adding grease quick and easy.
Features:
Specs:
Replace your existing grease cap with a Bearing Buddy for an easy way to monitor and maintain the grease level in your axle hub. Use a grease gun to add grease through the zerk fitting. As the hub fills, the spring-loaded piston moves outward, raising the blue auto-check ring. When the blue ring is 1/8" above the steel retaining ring, the hub is properly filled.
The O-ring inside the barrel of the Bearing Buddy maintains a seal from the outside. The pressurized grease inside the hub helps prevent water from entering and contaminating the grease. Bearing Buddy also includes an automatic pressure-relief feature to help prevent overfilling and damage to the inner seal. Once the hub is full, excess grease seeps around the edges of the piston and into the barrel while the blue auto-check ring remains raised.
Check the blue auto-check ring to see when it's time to add grease. If the ring has receded below or is flush with the steel retaining ring, more grease is needed. If the lip of the blue ring is 1/8" above the steel retaining ring, the hub is properly filled.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi there, I'm Michael with etrailer.com. Today we're gonna take a quick look at this Bearing Buddy set of chrome plated bearing protectors and these two Bearing Buddies are gonna replace the grease caps in the hubs on one of your trailer's axles. And this is gonna be especially useful on boat trailers. This will fit a 2.047 inch hub bore. This will work with the outer bearing cup or race model that you see on the screen there, as well as various outer bearing models will install very easily just like your grease caps be put in place there. And then this is going to serve a very important purpose of helping to protect your bearings.
So this will allow your boat trailers wheels to be completely submerged and it will maintain a slight controlled pressure of about three psi. It's got a spring loaded piston inside there that's going to have that pressure so that when your warm bearings and hubs enter the cold water and that vacuum forms that will oftentimes pull water and dirt into your hubs, that spring is going to keep pressure there so that water is prevented from entering the hubs and bearings which will help to prevent corrosion and pitting of your bearings which can cause to bearing failure. So this is gonna be a very important component if you are gonna be backing your boat trailer into water. This will help to prevent those bearings from failing for you. This is also going to allow you to visually monitor the level of grease with the blue indicator ring there.
So the ring will sit flush with the top of the cylinder when you've got enough grease in there when it's full. If the ring is below the top, you just need to add some grease and to move that piston outward about an eighth of an inch. So this will provide easy accessible grease fittings here. You can see on both these. So very simple to add your grease, very quick and simple for you.
And it's also gonna prevent overfilling because the automatic pressure relief feature here is going to allow grease to seep around the piston edges and into the barrel when it's full. So that's gonna help prevent any rear seal damage as well. Both of these are made here in the USA. They're constructed of stainless steel internal parts and a triple chrome plated steel barrel that ensures nice, long lasting fit, especially compared to like plastic or aluminum products is going to hold up well for you for a long time to come. You can see they do include these rubber covers you can put in place for extra protection, especially with your grease fittings.
You don't have to worry about any dirt, corrosion getting on those with those covers in place. And these do come with a lifetime warranty so if you we're to have any issues with them, you're more than welcome to reach out to us here at etrailer.com. We always enjoy working with our customers, make sure you're getting good quality products and help 'em solve any issues that may come up. But I do think these are gonna be a really great way to go especially for those of you who are frequently using your boat trailer. Think they'll pay for themselves within a season or two not having to worry about replacing your bearings and having that visual indicator for making sure you've got enough grease in there. That completes our look for today. Again, I'm Michael with etrailer.com. Thanks for watching.
Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
Ratings & Reviews

Rick S.
2/20/2015
A year later and the bearing buddy is doing its job with no issues to report! I know where to go when I need expert Trailer assistance - eTrailer!

Matt
8/13/2023
1 yr review still work prefect and looking like new only added a 12 of shot of grease to each side Great price at etrailer Thanks Again

Barth T.
7/11/2014
theses also work for the northern tool 5 x 8 trailer... hard to find this sizethanks fits great

Ralph
3/23/2026
It works great, no issues, the real thing at a great price. Perfect fit.

Richard
6/26/2020
Just started our camping season. Pulled the caps off, hooked up the grease gun, pumped some grease and done. Took longer to write this then grease. No pulling the 4 tires to get to the bearings and getting my hands greasy.

Hjrjolie
6/8/2020
Working great! Check the bearing buddy before and after using trailer and keep them filled. Couldnt be happier with my results. I feel confident I wont have any bearing failure for lack of grease!

Dirtstiff
2/18/2018
Bearing Buddy through trailer have given my little tag a long MC trailer trouble free confidence
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Added N.
4/8/2014
part number BB2047 will fit the following Harbor Freight Trailers.. 90154, 42709, 90153.42708, 2575 and 2948, as all those trailers use the same Harbor Freight replacement dust cover, received mine and they installed with little effort great product..Thanks etrailer,com