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Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles and DeeMaxx 8K Oil Bath Idler Hubs
Redline

Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles and DeeMaxx 8K Oil Bath Idler Hubs

Part Number: RG04-230
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$27.83
Retail:$42.60
You Save: 35%
Trailer Bearings Races Seals Caps
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Great Prices for the best trailer bearings races seals caps from Redline. Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles and DeeMaxx 8K Oil Bath Idler Hubs part number RG04-230 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (50)
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  • Videos (1)
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Redline Trailer Bearings Races Seals Caps - RG04-230

  • Caps
  • Oil Cap
  • 2.875 Inch O.D.
  • Redline


  • Fits Dexter 7-9K trailer axles with 8-bolt hubs
  • Oil cap, plug and O-Ring
  • Threading measurement: 2-7/8" O.D.
  • Fits 6K to 8K (and 9K before 10/1989) Dexter axles and DeeMaxx 8,000-lb oil bath idler hubs



RG04-230 Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles and DeeMaxx 8K Oil Bath Idler Hubs





Video of Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles and DeeMaxx 8K Oil Bath Idler Hubs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Redline Trailer Bearings Races Seals Caps - Oil Cap - RG04-230

Hello everybody, this is Jeff at etrailer.com. Today, let's take a look at the replacement oil cap with the plug and the O-ring for your Dexter and DMAXX eight-lug oil bath hubs. Now, this part here replaces the oil cap on your Dexter 6,000 pound to 8,000 pound Dexter axles with the eight-lug oil bath hubs that have the screw-in threads. It does also work on the old style 9,000 pound Dexter axles, the 410 of 1989. It does also work on the DMAXX 8,000 pound axles that have the eight-lug oil bath hubs with the screw-in threads. Basically, this cap is designed to screw into that hub and it keeps the oil on the bearings and the clear design of the cap allows you to see the oil level and the rubber plug right here could be easily removed to allow you to add oil to the hub if needed.

The thread size on this cap is 2-7/8 inch by 12, and it does include everything shown here, the threaded oil cap, the rubber plug, and the rubber O-ring that you'll put onto the threads before you install it. So when you do tag it down, it'll help seal it. But that should do it for the review on the replacement oil cap plug and O-ring for the Dexter and DMAXX eight-lug oil bath hubs.

Customer Satisfaction Score:


Customer Reviews

Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles and DeeMaxx 8K Oil Bath Idler Hubs - RG04-230

Average Customer Rating:  4.8 out of 5 stars   (50 Customer Reviews)


by:

Great deal, fast shipping, Thanks



by:

Ordered the parts by phone. Melissa was highly knowledgeable and extremely professional. Would recommend eTrailer to anyone that needs trailer parts or trailer hitches.



by:

Purchased these for spares to have with me whenever I have the trailer on the road. Exactly the same as I had, good price, quick service as always.



by:

perfect for my Dexter 8K axels oil bath



by:

Received dust caps but no hubs to put them on. Don’t really need them at this point.



by:

Awesome company, needed a special part for my trailer, instantly found it and had it shipped to me within 4 hours of me purchasing it.



by:

I needed 2 oil caps for Dexter axles,didn't know what size. I told the teck. the o.d. size and the thd. pitch got the right one. After receiving them,
I installed them. They fit perfectly. I will be ordering again.



by:

Need to ship in better packaging. Boxes came in with holes. Parts were missing.
Replacement parts were sent out but the job is now delayed waiting on the parts.



by:

great product



by:

The product was excellent and fit just as it should.

Gene T. profile picture

Gene T.

1/21/2015

The product is still working as it should with no problems.



by:

Quick Communication and getting issues resolved quicker than we request



by:

as expected perfect replacement



by:

Easy to order with Carol's help.
Fast
Delivery.



by:

Just as advertised. A little pricy but does the job.



by:

Great product and exactly like the original but would be better if made out of some metal product,



by:

Works as described but could be made of something beside plastic to last longer.



by:

Fits perfect, great website, fast delivery
this is about as wordy as I get! Thanks so much!



by:

Received in record time, fit perfectly. Thank You



by:

quick and exact of original works excel lent



by:

Direct replacement, no issues.



by:

Prefect fit and was delivered as promised. Never a problem with any of my orders from etrailer.



by:

Hey it works great thanks appreciate for all y’all‘s help



by:

Ordering was easy. Delivery was quick. Product was received in excellent condition.



by:

Fit perfectly , no issues with order ,



by:

Look great. Fair price and fit great


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

  • How Much Torque is Applied to a Kodiak Grease Cap for Installation
    I spoke to my contact at Kodiak and they informed me that a socket should not be used when removing or installing the grease cap like part # KPCAP as this would likely cause damage to the polycarbonate material used in it's construction. If the cap was over tightened then you can use a crescent wrench to loose it. The cap should then only be hand tightened. The same holds true for part # RG04-230.
    view full answer...
  • Replacement Caps for Oil Bath Hub With 2-3/4 Inch Diameter at the Threads
    We do offer a grease cap for an oil bath hub that has a 2-7/8 inch diameter at the threads, part # RG04-230, however the total height of the cap is 1-3/4 inches. This is the closest thing we offer to the oil bath cap you referenced.
    view full answer...
  • Replacement O-Ring For Dexter 7,000-9,000LB Axles With Threaded Oil Cap
    We do not carry the O-ring that is included with the Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles # RG04-230 separately. We only have it as a complete kit. I do not even see that Dexter offers this as a separate item on their own online store.
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  • Center Plug for Oil Bath Hubs Availability
    The plug that is included with the Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles part # RG04-230, 9,000-lb to 15,000-lb Dexter Axle part # RG04-270 and the 9,000-lb and 10,000-lb Dexter Axle part # RG04-300 is not available individually through our sources. I have linked the options available for you to check out.
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  • Can Dexter Hub & Drum 8-393-4UC3 be Used as Oil Bath Hub
    If you prefer an oil bath, you can do so with the Dexter Trailer Hub and Drum Assembly for 7,200-lb Axles Manufactured After 1999 # 8-393-4UC3. What you would need are the Unitized Oil Seal # 10-63 and Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles # RG04-230. Having said that, I recommend sticking with grease as opposed to oil. While oil can be less maintenance, they are both prone to leaks and don't keep water out of hubs as well as a grease cap. The issue with this is that...
    view full answer...
  • Replacement Bearings and Seals for Converting 8K Oil Bath Dexter Axle to Grease
    I believe I was able to find the bearings and seals that you need, but you'll want to double check on your end by removing the hub and looking at part numbers just to make sure. Inner Bearing - # 25580 Inner Race - # 25520 Outer Bearing - # 02475 Outer Race - # 02420 Grease Seals - # RG06-070 (2.250" ID and 3.376" OD) When it comes to the oil bath caps from what I could find yours should be part # RG04-230 which has an OD of 2.875" and nothing we have is that fits that. Since this is...
    view full answer...
  • How To Choose Correct Replacement Oil Cap for Trailer Hubs
    The best way to find the correct oil cap for a hub is to note the make and capacity of the axle which can both be found on the axle tag in the center of the beam. The Replacement Oil Cap part # RG04-230 for example fits Dexter 7,000 lb to 9,000 lb axles. I have attached a list of our oil cap selection below as well which you can filter through once you have the above. That said, we can't confirm fit for any one particular trailer make/model unfortunately.
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  • Is There a Replacement for the TDE Turbo Lube 48395 Oil Cap
    I might have some options for you but I wasn't able to reference the TDE Turbo Lube 48395 Oil Cap. Therefore, in order to find a replacement for this you'll need to measure the outer diameter of the threaded portion on the oil cap. The Oil Cap, Plug and O-Ring part # RG04-230 for example fits a 2-7/8" hub bore. There is also the option of switching to grease and using a cap like the Bearing Buddy Bearing Protectors part # BB2717SS which fit a 2.717" hub bore. I have attached other sizes...
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  • Replacement Plastic Cap and Seal for 8K EZ Lube Axle
    The Replacement Grease Cap for Kodiak 8,000-lb Disc Brake Kits # KPCAP is designed to fit a 2.25 inch spindle and has a thread outer diameter of 2-7/8 inch by 12 thread. We also have the Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles # RG04-230 with the same dimensions. We don't have the Viton O-ring outside of the cap replacement kit. Either of these will work on the EZ Lube axles.
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  • Can the HydraStar Disc Brake Kit HSE7K- TR1 Be Converted to Oil Bath?
    I spoke with HydraStar and their Disc Brake Kit w/ Actuator for Triple Axle Trailers # HSE7K-TR1 can be used as oil bath, but they do recommend using standard grease. This is due to when oil bath hubs are left sitting for a while, it will pool at the bottom of the hub. Grease will stay coated on everything and provide better coverage. The problem with these typically being used with grease will be the cap. This will use a cap like the Grease Cap, 2.72" OD Drive In with Plug - Qty 2 # rg04-120...
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    Image 1 for
  • Do 8k Oil Bath End Caps On Lippert Axle Interchange With Dexter End Caps
    I reached out to my contact at Lippert and got their specs on the 8K Oil Bath Caps. Dexter Axle had their specs on their website. The caps have a different threading so they are not interchangeable parts. The # RG04-230 oil caps will only fit the Dexter Hubs, but the Dexter hubs can work on a Lippert axle with proper race and bearings.
    view full answer...
  • Can The Oil Cap Included With Trailer Hub and Drum 8-285-10UC3-A Be Ordered By Itself?
    The Trailer Hub and Drum Assembly # 8-285-10UC3-A you were looking at is an oil bath hub designed to be used with oil such as the # XLPROLUBE and not grease like a standard hub. The oil cap included with this hub can be ordered by itself as part number # RG04-230. I included videos of the products mentioned for you to take a look at.
    view full answer...
  • Recommended Way to Add Disc Brakes to 2020 Momentum 376THS
    The first thing you'd want is the Kodiak Disc Brake Kit # K2HR79E for each axle. This is a 7k kit with an oil bath dust cover that fits your current spindles and also is compatible with your wheel size. For bearings you'd need to order the # 25580 and # 02475 separately as well as the seal # 10-63 as they are not included. Since you have a triple axle trailer you'd need three of the disc brake kits and 6 each of the bearings and seals. For an actuator kit the best option is the Hydrastar...
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  • Replacement Oil Bath Hub Cap for Dexter Trailer Hub
    The Oil Cap, Plug and O-Ring # RG04-230 is the replacement for the Dexter Trailer Hub and Drum Assembly # 8-219-9UC3-A. You will want to remember some Synthetic Bearing Oil # XLPROLUBE to refill the hub once you replace the cap.
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  • I Need Replacement Axle Oil Caps For My 1999 Fleetwood Bounder 34J Class A RV
    Thank you for all the information you gave. I have the replacement parts you need. It is the Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles, # RG04-230. I also reached out to my contact at Dexter and confirmed this is the proper cap for your vehicle. I've included a review video for this product that references the specific part numbers you referred to.
    view full answer...
  • Is there a Trailer oil Bath Hub Oil Cap for a Dexter 6,000 Pound Axle
    The 21-36 oil cap, # RG04-270, fits 9K (after 10/1989) and 10K GD (2 piece drum), and 10K to 15K Dexter axles. The 21-35, # RG04-230, fits 6K to 8K ( and 9K before 10/1989) Dexter axles. It would be too large with its 2-7/8 inch thread diameter. All of these oil caps are for oil bath hubs. If you are replacing a dust cap, you probably have regular hubs. For bearing protectors measuring 2.441 inches, go with the stainless steel bearing Buddies, # BB2441SS, or, if the hub is threaded, #...
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  • Redline Oil Cap And O-Ring Kit For Trailer With 9 Ton Axles
    If you have 7,000 to 9,000 lb Dexter axles on your tri-axle trailer, the oil cap kit you need for each hub is part # RG04-230. These are designed to fit 7-9k axles with 8-bolt hubs and includes the oil cap, plug, and O-ring. Just to be sure it will work the threading measurement is 2-7/8 inches outside diameter. This kit will fit older 6K, 8K, and 9K Dexter axles before 10/1989. if you do not have 7K to 9K axles on your trailer let me know what size axles you have and I can check...
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  • Which Magnet Fits etrailer 12x2 Electric Brakes for 5.2K to 7K Axles and Oil Bath Hub for 7K Axles
    The magnet used in trailer brake assemblies # AKEBRK-7-SA is magnet # AKBRKR-M12 which you will see they have rated the same as the brake assemblies themselves. So since they are compatible with up to 7K axles you can say they are rated for 7,000 pound axles maximum. We have tow hub and drum assembly kits for 7K oil bath axles. First is # 8-219-9UC3-A and it comes with a 2-1/4 inch diameter seal. The other is # 8-219-9UC3 and it comes with a 2-1/8 inch diameter seal. The oil cap included...
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  • Replacement Parts for Trailer Hub # 8-219-9UC3-A
    Here are all the replacement parts for the hub part # 8-219-9UC3-A: Replacement bearing # 25580 Race # 25520 Bearing # 14125A Race # 14276 Seal # 10-63 Oil cap # RG04-230
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  • Oil Cap Recommendation for Trailer Hub that Has Thread Diameter of 2-7/8 inches
    Sounds like you are looking for the part # RG04-230 which is an oil cap that has a 2-7/8 inch thread diameter.
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  • Why are Trailer Hub Oil-Bath Caps Always Plastic
    Oil bath caps that are threaded are always plastic like the part # RG04-230 that you mentioned. Them being plastic has the advantage that you can see through the cap to allow you to know that oil hasn't leaked out.
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  • Wheel Bearing Caps for a 2008 Dutchmen Freedom Spirit Superlite Travel Trailer
    We do have wheel bearing caps for your 2008 Dutchmen Freedom Spirit Superlite Travel Trailer. It depends on which model you have. The Bearing Buddy Bearing Protectors - Model 2441SS - Stainless Steel (Pair) item # BB2441SS fit the FS290SL and are 2.441 Inch. The Bearing Buddy Bearing Protectors - Model 2328SS - Stainless Steel (Pair) item # BB2328SS fit the FS310B-DSL, FS180, FS250SL, FS260B-DSL, FS260F-DSL, FS290R-DSL, and the FS270. It depends on which model you have and how the hub...
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  • Replacement Oil Cap for 2005 Place Snowmobile Trailer
    The only way to find the correct replacement oil cap for your 2005 Place Snowmobile Trailer is to measure. We have no way of knowing which hub assembly you have or which oil cap you need. The best way is to measure the outer diameter of your existing cap and use that to find a replacement. For example, the # RG04-230 has an outer diameter of 2.875". If this matches what you have now then it will work for your trailer. I have attached a link below to all of our available oil caps which...
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Do you have a question about this Trailer Bearings Races Seals Cap?


Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Sarah H
Expert Research:
Sarah H
Employee Chris R
Video Edited:
Chris R
Employee Eric H
Updated by:
Eric H

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