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  1. Trailer Bearings Races Seals Caps
  2. Bearing Buddy
  3. Caps
  4. Bearing Protector Grease Cap
  5. 3000 lbs Axle
  6. 1.78 Inch
Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair)
Bearing Buddy

Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair)

Part Number: BB1781
In Stock
$31.04
Trailer Bearings Races Seals Caps
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Provide your trailer wheel bearings with premium protection - replace your existing grease caps with Bearing Buddies. They install in seconds and provide an easy, safe way to monitor and control the level of grease in your axle hub. Great Prices for the best trailer bearings races seals caps from Bearing Buddy. Bearing Buddy Bearing Protectors - Model 1781 - Chrome Plated (Pair) part number BB1781 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (1424)
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Bearing Buddy Trailer Bearings Races Seals Caps - BB1781

  • Caps
  • Bearing Protector Grease Cap
  • 3000 lbs Axle
  • 1.78 Inch
  • Bearing Buddy

Provide your trailer wheel bearings with premium protection - replace your existing grease caps with Bearing Buddies. They install in seconds and provide an easy, safe way to monitor and control the level of grease in your axle hub.


Features:

  • Replaces the grease cap in the axle hub
  • Prevents wheel-bearing failure
    • Keeps water and dirt out of hubs and bearings
    • Allows boat trailer wheels to be completely submerged
    • Stops corrosion and pitting on bearings
  • Provides easily accessible grease fitting
    • Makes adding grease to the bearings quick and simple
  • Maintains slight, controlled pressure (3 psi) with spring-loaded piston, preventing water from entering hub
  • Prevents overfilling and rear seal damage with automatic pressure-relief feature
    • Grease seeps around piston edges and into barrel when full
  • Constructed of stainless steel internal parts and triple-chrome-plated steel barrel
    • Ensures longer-lasting fit than plastic or aluminum products
  • Includes rubber covers
  • Installs easily
  • Made in the USA


Specs:

  • Fits 1.781" hub bore
    • Works with outer bearing model LM-11949
    • Works with outer bearing cup (race) model LM-11910
  • Lifetime warranty


Bearing Buddy installed diagram

Bearing Buddy Operation

Replace your existing grease cap with a Bearing Buddy to ensure a safe, easy way to monitor and control the level of grease in your axle hub. To adjust the amount of grease in the hub, use a grease gun to add more through the appropriate fitting. Adding grease moves the Bearing Buddy spring-loaded piston outward 1/8".

The O-ring inside the barrel of the Bearing Buddy maintains a seal from the outside. The interior of the Bearing Buddy is pressurized, preventing water from entering the barrel and diluting the grease.

An automatic pressure-relief feature is built into the Bearing Buddy. When the device is full, grease will seep around the edges of the piston and into the barrel. This prevents overfilling that can damage the inner seal.

You can manually check the grease level in your Bearing Buddy by pressing on the edge of the piston. If you can rock or move the piston, the hub is properly filled.



41200 Bearing Buddy Model 1781 - Chrome Plated (Pair)





Customer Satisfaction Score:

Ratings & Reviews

4.8

1414 reviews
Provide your trailer wheel bearings with premium protection - replace your existing grease caps with Bearing Buddies. They install in seconds and provide an easy, safe way to monitor and control the level of grease in your axle hub.

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Fast shipping. Excellent products.



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See what our Experts say about this Bearing Buddy Trailer Bearings Races Seals Caps

  • Can Bearing Buddies Be Installed on 2017 Rockwood Mini Lite Camper
    Hi Robert; you can install bearing buddies but you will need some more information. More specifically, you need your hub bore diameter. One of the most common sizes is 1.98" which would use the # BB1980A-SS. If you have a 1.781" hub bore then the # BB1781 you were looking at would fit. This is a precise measurement so it is best to use a digital caliper # PTW80157. I went ahead and attached a link below to all of our Bearing Buddy bearing protectors below for your reference which can be...
    view full answer...
  • Looking For Bearing Buddies For A 1988 Boat Trailer With 14" Single Axle Wheels
    Hey Norman, it sounds like you are looking for bearing buddies for your boat trailer. Without a caliper measurement it is going to be difficult to accurately recommend the correct parts. There are a few potential sizes that could appear to be 1-7/8" to the naked eye. The Bearing Buddy pair you were looking at, part # BB1781, fits a 1.781 inch hub bore. I do suggest that you take a caliper such as part # PTW80157 to double check your hub bore measurement. Feel free to post your findings...
    view full answer...
  • Shorelander Wheel Hub Stud Recommendation
    Looks like you have a spline diameter of .56 inches and and threaded portion of 1/2 inch which is very popular. For that you'd want the part # K12WB2. I attached a picture that has a dimensional diagram for you to check out as well.
    view full answer...
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  • How To Tell If Bearing Buddy Has Enough Grease
    The great thing about Bearing Buddy like part # BB1781 is that when you add grease to your system with the included fitting, it will move the spring-loaded piston outward and allow grease to seep around the edges to keep from damaging the seal. You can manually check the Bearing Buddy to be sure it has enough grease. All you need to do is press the edge of the piston. If you can move or rock the piston it has enough grease. I have attached a drawing of a Bearing Buddy you can check out...
    view full answer...
    Image 1 for
  • Bearing Buddy That Fits 2.7 Inch Hub Bore
    We do have a Bearing Buddy which fits a similar dimension as the 2-3/4" you referenced but I do recommend using a digital caliper and measuring your hub bore size to the thousandths of an inch to ensure you get the correct fit. For a 2-3/4" hub bore the closest fit we have are Bearing Buddies that fit a 2.717" hub bore, the Bearing Buddy Bearing Protectors - Model 2717SS - Stainless Steel # BB2717SS and the Bearing Buddy Bearing Protectors - Model 2717 - Chrome Plated # BB2717. I have...
    view full answer...
  • How To Tell What Size Bearing Buddy Is Needed for My Trailer Hubs
    The portion you need to measure is not the cap, but the the hub bore. Remove the grease caps and measure the diameter of the opening the caps occupy. This is the hub bore. You will need an accurate measuring devices like a set of dial calipers that is accurate to 3 decimal places. The Bearing Buddy pair you were looking at, part # BB1781, fits a 1.781 inch hub bore. The measurement you find should match exactly or very close to one of the measurements displayed on the Bearing Buddy page...
    view full answer...
  • Looking For Bearing Buddies For A 2005 Shorelander Trailer
    Hello Steve, I can definitely point you in the right direction. Regrettably, I am not able to accurately recommend a bearing buddy based on just the # L44649 outer baring size. This outer bearing size is common on several different sizes of hub ranging from 2,000 lb up to 3,500 lb. That said, there is one size that is much more common than the others, and that is the 1.98" bearing buddies # BB1980A-SS. These are most common on the 3.5K axles, so if you can tell me your axle capacity that...
    view full answer...
  • Do Bearing Buddies Pack the Inner Bearing w/ Grease?
    No, you do not! Bearing Buddy Bearing Protectors like item # BB1781 grease both the inner and out bearing so you don't need to worry about taking your hub apart to repack the inner bearings.
    view full answer...
  • How to Add Grease to Super Lube Trailer Hub with Rear Grease Zerk Fitting
    The rear side of a Super Lube hub has a grease zerk fitting that works like the one on a Bearing Buddy grease cap such as # BB1781. These zerk fittings let you add wheel bearing grease to the hub interior without having to remove it from the spindle. The claimed advantage of the Super Lube hub is that the rear zerk fitting gives you the same grease fill convenience as a Bearing Buddy but without the risk of blowing out the rear grease seal from the pressure of pumping in too much grease....
    view full answer...
  • Can Bearing Buddy Bearing Protectors Be Over-Filled with Too Much Grease
    It is possible to over-fill a hub that has a Bearing Buddy bearing protector such as # BB1781. The convenience of easy filling through the zerk fitting can often mean we can be tempted to keep adding more grease. ("If a little is good, then more is better"). What usually happens is that the rear grease seal gets blown out from the excess grease/pressure and so I suggest you inspect your grease seals to make sure they are still intact and without excess grease having been pushed out past...
    view full answer...
  • Should Zerk Fittings on Trailer Hub Spindles be Used to Fill Hub with Grease
    With EZ lube spindles like what you have the best recommendation I can make is to actually not use the grease fitting at all as odd as that may sound. For best results it's best to pack the bearings and hub with grease by hand. The reason for this is that the grease fittings make it way too easy to over fill the hub which will either blow out the grease seal right then or will on the highway once it's warmed up a bit. Some people swear by putting in grease until you start to see it come...
    view full answer...
  • Can Bearing Buddy Fit on EZ Lube Spindle that has Zerk Fitting
    Yes you can use a Bearing Buddy on your current axle setup but you'll have to remove the zerk/grease fitting. What you have now is an EZ lube spindle which allows you to push grease through the middle of the spindle but you can install a Bearing Buddy over one of these spindles and it will still work. The trick to picking out the correct Bearing Buddy is to go with the one that fits the bore of the hub you have where the grease cap goes. The part # BB1781 fits hub bore of 1.781 inches. You'd...
    view full answer...
  • Comparing Buddy Bearings and EZ-Lube Grease Caps
    The Bearing Buddy Bearing Protectors like part # BB1781 will only work for standard spindles, not those with grease fittings in the end which are also known as EZ-Lube. They both are designed to provide easy lubrication to the bearings without having to pull apart the hub. If you have EZ-Lube hubs you'll have to use grease caps, preferably ones that have an easy to remove center section like the Grease Caps part # RG04-040.
    view full answer...
  • Determining Which Diameter to Measure for Bearing Buddy
    You need to use the inner diameter of your hub bore to determine what size Bearing Buddy you need. If you measured the outside diameter and chose your Bearing Buddy on that, then it will not fit. If you measured the inner diameter, then as you said, it's supposed to be a tight fit. To get an accurate measurement of your hub bore, it's best to use a digital caliper like part # PTW80157 as this is accurate to 0.01 inches. Once you have measured, then choose your Bearing Buddy with that...
    view full answer...
  • Bearing Buddy that Fits Hub Bore Around 1.75 inch
    If the hub bore is 1.5 inches like you mentioned (the area of the hub where the cap installs) then we don't have a Bearing Buddy that will fit. If the measurement was more like 1.75 inch then the # BB1781 would most likely fit as it measures 1.78 inches.
    view full answer...
  • Troubleshooting Grease Seal Failure when Using Bearing Buddy Bearing Protectors
    Bearing Buddy Bearing Protectors like # BB1781 have a spring loaded pressure in their design. There are times that this pressure will cause a failing seal to leak and high altitudes would be another aspect that could cause leaking to happen. When using Bearing Buddy Protectors, I recommend at minimum using a double lipped seal but the manufacturer also has a special seal for some spindle measurements like the Spindle Grease Seal Set for LM67048 Inner Bearing and 1.781 Bearing Buddy # BB60007.
    view full answer...
  • How To Determine The Correct Bearing Buddy Dust Cover For A 2021 Shoreland'r Boat Trailer
    To figure out what Bearing Buddy you need for your 2021 Shoreland'r boat trailer you'll need to measure the diameter of your hub's bore hole (pictured below). Once you have that measure we can find the correct fitting Bearing Buddy. For example, the Bearing Buddy Bearing Protectors # BB1781 you were looking at is a fit for a 1.781" hub bore hole diameter.
    view full answer...
    Image 1 for
  • How to Pick Out Replacement Hubs for Mobile Home Axles
    You would have to contact your local DOT to find out if the tires/wheels/hubs you have are street legal in your area. Typically mobile home axles are set up for one time use so relying on them for any length of time might not be the best idea. You can also try contacting HADCO directly to see if they recommend your specific hub for highway use. You may find that you need to replace your hubs. In order to pick out the correct hub assembly for a trailer you are going to need know a few key...
    view full answer...
    Image 1 for Image 2 for
  • Which Bearing Buddy Is Compatible With 2013 Karavan Sea-Doo Trailer
    The bearing size is needed to confirm the fit of the bearing buddy needed. There are some Karavan trailers that use sealed bearings that cannot use Bearing Buddy grease protectors, but those specific bearings don't need them because they are maintenance free and sealed to keep water out. If you pull a hub, you will find the bearings and if you have standard tapered bearings, the number of the bearing will be printed on the hub face when you clean the grease off that portion. If you...
    view full answer...
  • Trailer Bearing Protector for a Hub with a 2-1/16 Inch Bore
    I can determine the correct bearing protector if you can provide me with the inner and outer bearing numbers stamped into the metal of the existing bearings on the trailer. Otherwise, I will need the most accurate measurement possible of the hub bore using dial calipers. We do not have a bearing protector that measures 2.0625 (2-1/16 inches) but normally they are slightly larger than the hub bore for a tight fit. You may need a 2.08 like # BB2080SS. Knowing the inner and outer bearing...
    view full answer...
  • Which Bearing Buddy for 2.325 Hub Bore
    Given the dimension you kindly provided, you'll need # BB2328 for chrome plated or # BB2328 for the stainless model. If you're in a marine environment, you'll definitely want the stainless model. Either is designed for a 2.328 inch hub bore. To absolutely confirm fit, your outer wheel bearing should be LM67048.
    view full answer...
  • Need Bearing Buddy for 2-1/8 Inch Diameter Trailer Hub Bore
    The closest Bearing Buddy we have to a 2-1/8 measurement is going to be a slightly larger set that measures 2.240 inches, # BB2240 or # BB2240SS. In order to determine the correct Bearing Buddy for your trailer, the best way is to get the inner and outer bearing numbers on the bearings and/or the number on the outer cup (race). The Bearing Buddy part numbers listed above fit 1700 series outer bearings with race model 1729.
    view full answer...
  • Using Bearing Buddy Protectors on 2013 Karavan Single PWC With Waterproof Stamped Dust Cap
    After reviewing the Karavan trailer owner's manual I found the following information: Please note that some Karavan Trailer models are equipped with Knott-AutoFlex Waterproof bearings that require no maintenance. DO NOT remove the metal cap for any reason or damage could result to the bearings. The caps have KNOTT– WATERPROOF stamped in them. It sounds like this is what you are describing with the waterproof stamp. Based on this information, I would not recommend using the # BB1781 Bearing...
    view full answer...
  • Determining Bearing Buddy Size For Folding Trailer
    The best way to find the correct Bearing Buddy for your folding trailer is by checking the numbers on the outer bearing. I have attached a photo that shows where the numbers can typically be found. You can use those numbers to find the correct Bearing buddy that will work for you. Another way to find the correct Bearing Buddy is by measuring the hub bore. You will need a caliper to get an accurate measurement. After getting the measurement you can choose the Bearing Buddy that fits. I...
    view full answer...
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