How to Measure a Trailer Hub or Dust Cap to Find the Right Replacement Dust Cap

Question

Question:

I have a golf cart trailer that I turned into a utility trailer. I just finished the trailer up and I have notice that my new dust cap fell off. Is there any way of measuring the old dust cap that I have that I replaced with the new. I really dont want to take the wheel off again.

asked by: Kevin

0

Expert Reply:

You can measure either the outer diameter of the part of the dust cap that fits into the hub OR the inner diameter of the hub where the dust cap goes using calipers such as # PTW80157. Calipers are needed because the measurement has to be as accurate as possible.

I also might be able to figure it out based on the outer bearing number which you should be able to see without taking the hub off.

expert reply by: Michael H

0

David N.

2/11/2020

MY hub measured 1.9996. Do I use a 2.0 cap or what size is correct?

Reply

Jason S.

2/12/2020

You will want the Grease Cap, 1.99" OD EZ Lube Drive in with Plug - Qty 2 # RG04-040. The caps don't get rated to the ten thousandths place.

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Brandon C.

4/19/2020

Hello I measured my dust cover at 1.775 with digital calipers. I need two for my boat trailer and was hoping to find some bearing buddies.

Reply

Chris R.

4/21/2020

We don't have a Bearing Buddy set that quite matches up to the diameter you listed. Would you be able to measure the actual hub bore diameter (instead of the cap itself) with that caliper?

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Answer 1

Hi Elliott; the Valterra RV Water Tank #R8048 has three 3/8" threaded fittings on each end of the tank. You can see them in the attached picture, one has a red plug. The tank is only designed to be gravity fed or used with a hand pump, not an…

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Answer 2

The first thing to try to is add some penetrating oil like WD40 and let it sit for awhile. You can then try tapping the bearing to try and remove it. You don't want to hit it too hard because you can damage the spindle. It is possible that the…

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Answer 3

You would need to measure the inside diameter of the hub opening to determine which cap size is needed. You would want to choose a cap whose outside diameter matches the inside diameter of the hub. Some of the most common sizes are 1.980 inch, 1.986…

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Answer 4

Because the Valterra RV Water Tank #R8048 is a lightweight tank that is baffled for surge control, it is not designed for use with electric water pumps. It would void the warranty if used this way and is why they specifically note on their site:…

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Answer 5

Hey Robert, yes the Kodiak disc brake calipers part #KDBC225DAC that you referenced will replace the Tie Down calipers you have now 46304, they can be used as a left or right hand caliper and does come with ceramic brake pads. If you ever needed…

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Answer 6

Usually when you replace parts that get lubricated, you clean all of the existing grease first before adding any new grease, just in case there is a compatibility issue. Since you are using Dexter axles and replacing components with Dexter parts, the…

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Answer 7

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 8

The standard 5,200 lb axle will use either the Bearing Kit #BK3-310 which has a grease seal ID of 2.125" or the Bearing Kit #BK3-300 which has a grease seal ID of 2.25". The bearing numbers are the same for each kit (25580 inner and LM67048…

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Answer 9

For lubricating any lock, a dry lubricant like powdered graphite is recommended. Using grease and oil or spray lubricants like WD 40 can actually attract dirt and grime and make the lock cylinder sticky after a time.

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Answer 10

The grease seals that will work with your Lippert axle is part #RG06-070. this comes with a quantity of 2 double-lipped seals in the package. If you have everything apart you may want to replace the bearings and races as well. You would need part…

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Answer 11

The Lippert 8,000 Lb Axles use a part #25580 inner bearing, a part #02475 outer bearing, and a part #GS-2250DL grease seal. Then for the brakes, you'd need the Electric Trailer Brake Kit part #AKEBRK-8. In regards to the leaf springs and shackle…

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Answer 12

If there is any corrosion built up on the hub, it could be built up corrosion built up on the hub bore making the hole read smaller. Grease caps do not have to be very deep. They only have to go in far enough to fit snug and tight inside the hub…

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How to Measure a Trailer Hub or Dust Cap to Find the Right Replacement Dust Cap

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