No parts are more critical for the dependable performance of your trailer than the bearings, races, and seals. To ensure that your trailer performs reliably, you should inspect the bearings, races, and seals and repack the bearings every 12 months or 12,000 miles.
Parts and Tools | |||||
---|---|---|---|---|---|
![]() |
![]() |
![]() |
![]() |
![]() ![]() |
![]() ![]() ![]() |
Bearings, races, and bearing kits | Seals | Grease | Spindles | Grease caps and bearing protectors | Greasing tools: bearing packers, seal pullers, and grease guns |
Recommended Bearing Grease
Shop for spindle nuts, washers, and retainers
The dust cap will install directly over the castle nut. You should be able to start installation of the dust cap with your hands by pressing it into the center of the hub. After it has been started, use a piece of wood to tap it in the rest of the way. Make sure the outer lip on the dust cap is tight against the hub or drum. The wood will help you to avoid damaging the dust cap.
The main purpose of bearing protectors is to keep out water. A grease-filled hub will have some pressure built up inside, and this is what prevents water from seeping in. When filling the bearing protectors with grease, be careful not to overfill them. To help prevent overfilling, the bearing protector will have a small hole that allows the excess grease to spill out the side.
It is not a good idea to fill the hub with grease on every trip. If the release valve is clogged, or the hub runs out of room, the grease will probably blow out through the grease seal. If you have brakes on the trailer and the seal fails, the brake shoes will be contaminated and will need to be replaced.
It is good practice to fill the hub until grease starts to move the pressure spring on the bearing protector. Check it to see whether the spring has gone down then add a little more. Bearing protectors come with bras (or covers) that are designed to keep the excess grease from flinging out of the release valve and help to keep your wheel clean.
Shop for grease caps and bearing protectors
Replacement Bearings | Race | |||
---|---|---|---|---|
Part No. | Description | I.D. | Part No. | O.D. |
L44643 | Inner/Outer for BT8 | 1.000" | L44610 | 1.980" |
L44649 | Inner/Outer for BTR, Outer for #84 Spindles | 1.063" | L44610 | 1.980" |
L68149 | Inner for 3.5K Axles | 1.378" | L68110 | 2.327" |
L68149 | Inner for 4.4K Axles | 1.378" | L68111 | 2.362" |
1779 | Outer for 22834 Hub | 0.938" | 1729 | 2.240" |
2788 | Inner for 22834 Hub | 1.500" | 2729 | 3.000" |
LM48548 | Inner for AH25555F Agricultural Hub | 1.375" | LM48510 | 2.563" |
LM67048 | Outer for 8-201-5, 8-213-5 | 1.250" | LM67010 | 2.328" |
15123 | Outer for 42655, 42656, 8-174-5 | 1.250" | 15245 | 2.441" |
14125A | Outer for 42865, 42866, 8-219-4, 8-231-9 | 1.250" | 14276 | 2.717" |
25580 | #42, 8K, 9K, Inner (Pre 10/89), Outer for #99 | 1.750" | 25520 | 3.265" |
31-71-3 | 50MM Cartridge Style, Nev-R-Lube | 50MM | - | - |
31-72-3 | 35MM Cartridge Style, Nev-R-Lube | 35MM | - | - |
31-73-3 | 42MM Cartridge Style, Nev-R-Lube | 42MM | - | - |
02475 | Outer for 8-231-8, 8-218-9, 8-187-7 | 1.250" | 02420 | 2.688" |
2585 | Outer for 8-232-5 | 1.313" | 2520 | 2.750" |
387A | Outer for 8-214-5, Inner for 8-260-5 | 2.250" | 382A | 3.813" |
395S | Inner for 8-214-5 | 2.625" | 394A | 4.331" |
3984 | Inner for 8-216-5, 8-214-8, 8-217-5, 8-272-5 | 2.625" | 3920 | 4.438" |
28682 | Outer for 8-216-5, 8-214-8, 8-217-5, 8-727-5 | 2.250" | 28622 | 3.844" |
28580 | Inner for all #99 Spindles | 2.000" | 28521 | 2.875" |
JM205149 | For 090814 Hayes 10K | 1.969" | JM205110 | 3.543" |
JM511946 | For 090814 Hayes 10K | 2.559" | JM511910 | 4.331" |
HM212049 | Outer for 20K - 25K Axles | 2.625" | HM212011 | 4.813" |
HM218248 | Inner for 20K - 25K Axles | 3.542" | HM218210 | 5.786" |
LM11949 | Outer for AH15450E Agricultural Hub | 0.750" | LM11910 | 1.781" |
29749 | For AH30660F Agricultural Hub | 1.500" | 29710 | 2.563" |
501349 | Outer for AH60880F, Inner for AH35660F | 1.625" | 501310 | 2.891" |
506849 | For AH60880F Agricultural Hub | 2.165" | 506810 | 3.543" |
603049 | For AH45880F Agricultural Hub | 1.781" | 603011 | 3.063" |
Wheel Bearing Kits | ||||
---|---|---|---|---|
Part No. | Outer Bearing | Inner Bearing | Seal | Seal I.D. |
BK1-100 | L44643 | L44643 | 34823 | 1.249" |
BK1-150 | L44649 | L44649 | 10-60 | 1.500" |
BK2-100 | L44649 | L68149 | 10-19 | 1.719" |
BK3-100 | 15123 | 25580 | 10-36 | 2.250" |
BK3-110 | 15123 | 25580 | 10-10 | 2.125" |
BK3-200 | 14125A | 25580 | 10-36 | 2.250" |
BK3-210 | 14125A | 25580 | 10-10 | 2.125" |
BK3-310 | LM67048 | 25580 | 10-10 | 2.125" |
BK3-300 | LM67048 | 25580 | 10-36 | 2.250" |
DL21792 | L44643 | L44643 | 34823 (12192VB) | 1.249" |
I have a 4by 7 utility trailer,not really trusting the wheel bearings,can you tell me what hubs will fit,it’s a 2000 lb trailer
@Leroy The bearings are selected by their spindle diameters. You can get this information by either taking the hub assembly off and measuring the spindle at each of 4 points for inner bearing, outer bearing, grease seal, and race. Another (preferred) way is to take the bearings out and record the number imprinted on them for cross reference. With that information we can provide you the part numbers you will need to replace them. I have attached a page with information you will need.
Helpful Links
Liked article. I bought boat trailer hub and bearings all done. Rear bearing seal in place and no taper to axle. My kit has the outer bearing seal. Inner was already on. If I put outer bearing seal in there won’t be enough room for caps to be put in. I read 5 or 6 articles making sure I didn’t need that outer seal. None of them mention the outer bearing seal. Must be for different application ?? I slid it on placed outer bearing, washer, castle nut, cotter pin and cap. Bugs the ....! Out of me with that extra part.
How old is your boat trailer? I've never heard of putting a grease seal on both ends of the hub. Normally you have one on the inside (closest to the center of the trailer) and then you have the grease cap at the very end of the hub.
keep up the good work GREAT information Great customer service,
Thank you for the kind words!
I have a 2015 enclosed 6x12 Spartan trailer with tandem wheels. The owners manual does not give me any information about the brand or pn of the wheel bearings. There is a small amount of play in the wheels. Do you know what the pn for this bearing would be and do you stock a kit for this? I would like to make sure I have access to the parts before tearing it down.
I can help you out but unfortunately we don't have a list of replacement parts for various trailers. If you can let me know what your axle weight rating is that can help me narrow it down a bit. You should also be able to reach out to your trailer manufacturer and they generally have the replacement part numbers.
I have a 2011 Coachmen Apex 17FB camper trailer that I just bought. I believe the wheel bearing need to get repacked at least every 12,000 miles. I know that some (or all) Class A, B and C Rv's use what's called "sealed bearings". These types of bearings use a rolled element rather than balls and are designed to keep dirt and grease out. Boat trailers also use sealed bearings since they are made to be submerged in water. Is it possible for me to replace my wheel bearings on my trailer with sealed bearings or somehow provide for a grease fitting to avoid having to remove the wheel for repacking the bearings so often..?
Are you referring to Nev-R-Lube Bearings like # 31-71-3 ? These are unique bearings that are specific to certain hub assemblies - not something you could switch out using existing hubs. Other bearing types might offer more protection but you'll still want to re-pack them at least every 12,000 miles or 1 year.
Questions and Comments about this Article