Wheel on my Trailer Goes Thump Thump - Fiberglass RV



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Old 05-22-2019, 03:39 PM   #1
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Name: Huck
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Wheel on my Trailer Goes Thump Thump

When I took my Parkliner in earlier this year to get new tires, I noticed a thump noise. Both before and after new tires I heard a thump.

I replaced the bearings today (old ones seemed OK) and was able to identify the left wheel as the source of the thump. When I had the wheel in the air, I spun it and heard thump thump on every rotation, with the 1st thump being louder than the 2nd.

I know it's not the tire and not the bearings. What else could be causing the problem?
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Old 05-22-2019, 03:42 PM   #2
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brakes ?
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Old 05-22-2019, 04:36 PM   #3
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brakes ?
How would I determine if it is brakes or not?
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Old 05-22-2019, 05:07 PM   #4
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with that side of the trailer jacked up, take the wheel off, turn the brake rotor slowly, do you feel scraping at some part of the turn? trailer brakes need manual adjusting from time to time
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Old 05-23-2019, 05:23 PM   #5
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Originally Posted by Huck View Post
When I took my Parkliner in earlier this year to get new tires, I noticed a thump noise. Both before and after new tires I heard a thump.

I replaced the bearings today (old ones seemed OK) and was able to identify the left wheel as the source of the thump. When I had the wheel in the air, I spun it and heard thump thump on every rotation, with the 1st thump being louder than the 2nd.

I know it's not the tire and not the bearings. What else could be causing the problem?
:have you pulled the Axel to see if is straight or flat on one side??
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Old 05-23-2019, 05:28 PM   #6
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Originally Posted by stude View Post
:have you pulled the Axel to see if is straight or flat on one side??
Stude
How does one pull an axle to see if its straight?
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Old 05-23-2019, 06:48 PM   #7
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How does one pull an axle to see if its straight?
We had a bent axle on our Casita (Dexter). We were told that a bent axle can be confirmed with a laser but the problem was diagnosed based on tire wear and the fact that we had repaired damage from a fallen tree.
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Old 05-24-2019, 08:08 AM   #8
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A bent axle manifests as uneven tire wear. Not the direction the OP needs to be looking to diagnose a rhythmic thumping.

Do we have an update on the brake situation?
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Old 05-24-2019, 11:24 AM   #9
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A bent axle manifests as uneven tire wear. Not the direction the OP needs to be looking to diagnose a rhythmic thumping.

Do we have an update on the brake situation?
Not yet. I did find out the electric brakes are self-adjusting, so I don't think adjusting them will fix the problem.

There was still a sticker on the tire (new), so using the sticker as a marker I know that the thump thump happens at the same point every time.

My plan is just to remove the wheel again and hunt for clues. If I don't see anything I can fix, I will put it in the shop. The other wheel has a cross-threaded lug nut and stud, so those need to be replaced as well. I'm pretty sure the tire place guy is the one I can thank for that problem.
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Old 05-24-2019, 12:05 PM   #10
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Not yet. I did find out the electric brakes are self-adjusting, so I don't think adjusting them will fix the problem.

There was still a sticker on the tire (new), so using the sticker as a marker I know that the thump thump happens at the same point every time.

My plan is just to remove the wheel again and hunt for clues. If I don't see anything I can fix, I will put it in the shop. The other wheel has a cross-threaded lug nut and stud, so those need to be replaced as well. I'm pretty sure the tire place guy is the one I can thank for that problem.
Can you put the other wheel or spare on that side and see if it persists? That could eliminate or identify the tire or wheel as the problem.
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Old 05-24-2019, 12:14 PM   #11
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Originally Posted by Huck View Post
When I took my Parkliner in earlier this year to get new tires, I noticed a thump noise. Both before and after new tires I heard a thump.

I replaced the bearings today (old ones seemed OK) and was able to identify the left wheel as the source of the thump. When I had the wheel in the air, I spun it and heard thump thump on every rotation, with the 1st thump being louder than the 2nd.

I know it's not the tire and not the bearings. What else could be causing the problem?
You are right, it can’t be the tire. Did you replace the race when you replaced the bearing?
Dave & Paula
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Old 05-24-2019, 01:24 PM   #12
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You are right, it canít be the tire. Did you replace the race when you replaced the bearing?
Dave & Paula
No, the old ones appeared to be OK.
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Old 05-24-2019, 03:29 PM   #13
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The race could have a slight flat spot or other defect that you could not see, but?
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Old 05-27-2019, 08:12 AM   #14
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Wheel on my Trailer Goes Thump Thump

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Originally Posted by Huck View Post
...The other wheel has a cross-threaded lug nut and stud, so those need to be replaced as well. I'm pretty sure the tire place guy is the one I can thank for that problem.
It happens. Tire work is entry-level employment for mechanics, along with oil changes. Tough job, and lots of pressure to hurry. I was sent out with no oil once. Caught it in time, no harm done thanks to synthetics (had oil tested at the next change). The young man, new on the job, was fired on the spot. I felt bad, though of course it was a serious mistake. Studs are no big deal.

I use Discount Tire (Americaís Tire in some regions) for all my tire work. When they discovered a cross-threaded stud on a recent rotation, they arranged repair at another shop. Took an extra hour of my time, but minimal hassle and no cost to me.

If you donít find something simple yourself, Iíd want an experienced older mechanic to look at everything.
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