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Old 05-24-2023, 07:35 PM   #1
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Micro Minnie 2108DS Wheel Bearing Lube

Just a heads up for all Micro Minnie owners on lube for your wheel bearings.

Wheel lube should be done every year. But Iím lazy, and didnít get around to this task until late in second year. Fortunately, Micro Minnieís are equipped with Zirc lube fittings. It makes this maintenance chore much easier. Use any type of high-temp grease.

Roll one wheel up onto an Anderson type elliptical leveler. This will lift the second axle off the ground. Remove decorative cap with flat blade screwdriver, and remove interior dust cover with same. First turn the wheel to determine if the brakes are set properly. There should be some grinding and resistance if the brakes are properly set. If wheels turn with no resistance, then you need to adjust brakes with a brake adjusting tool.

Follow instructions for loading the grease gun, and attach pressurized fitting (such that some grease comes out when you squeeze the trigger) to the zirc fitting in the wheel. Turn the wheel while squeezing the trigger repeatedly until you see pink lube coming out of the fitting. Note: you must turn the wheel when squeezing the grease trigger, or grease will not get into all the bearings.

When you see pink grease coming out of the fitting, Remove the grease gun. Scoop out excess grease from the wheel Bering with a paper towel. Replace rubber dust cover. Replace decorative wheel cover. Move on to next wheel.

After two years of neglecting this essential task, each wheel consumed approximately 1/2 tube of grease. Iím just thinking, dude, you should have done this way sooner. An accident/emergency could have happened

Easy maintenance task. About $20 for the grease gun at any auto parts store, and $20 for the two tubes of grease. Wear nitrile gloves. Chore takes about an hour.
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Old 05-24-2023, 10:41 PM   #2
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Your timing of this post is impecible!
I was justbturning my attention to this task.
Thank you,
- steve
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Old 05-25-2023, 05:23 AM   #3
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... agreeing with Marine359. Remember the Fram commercials of some decades ago: "Pay me now, or pay me later".

I wonder when I pass a bearing failure on the side of the road if $.50 worth of grease would have prevented it.
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Old 05-25-2023, 06:46 AM   #4
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This process works well as long as the rear seal is in good condition. I've read too many stories where the grease went past the rear seal and on to the brake shoes. That is why I go to the trouble of hand packing the bearings. Maybe I am overly cautious.
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Old 05-25-2023, 06:59 AM   #5
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Quote:
Originally Posted by Bigbird65 View Post
This process works well as long as the rear seal is in good condition. I've read too many stories where the grease went past the rear seal and on to the brake shoes. That is why I go to the trouble of hand packing the bearings. Maybe I am overly cautious.

Thatís a good thing if your rig has some years and miles on it. Not really a risk on a newer rig. But if itís a concern, you can always remove the wheel to check.
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Old 05-25-2023, 06:40 PM   #6
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Thanks Marine359! I will definitely add this to my roof caulking check each fall.
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Old 05-26-2023, 03:34 PM   #7
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Quote:
Originally Posted by Bigbird65 View Post
This process works well as long as the rear seal is in good condition. I've read too many stories where the grease went past the rear seal and on to the brake shoes. That is why I go to the trouble of hand packing the bearings. Maybe I am overly cautious.
Hand packing definitely uses less grease as your not filling the hub. Pulling the hub to pack rear bearings will cost you a new seal each time and more time consuming too.

I have never done it Via the zirc fitting which is much easier. If grease pushes past the rear seal I'm unsure if their is a way of telling if the seal failed before it's too late.

Some trailer owners put on many miles/Km a year. Some trailer owners put on very few few miles/Km a year.

Is their any repack service schedule based on miles/Km towed per year?
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Old 05-26-2023, 03:55 PM   #8
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Bcborn actually you can repack the rear bearing without removing the rear seal. I push the rear inner bearing toward the front of the hub, maybe 1/8". With a finger full of grease I force the grease between the rear seal and the bearing. I keep doing this until I have thoroughly packed the complete bearing. It only takes a few minutes to do this. I have used this technique on 2 different Winnebago trailers since 2014 and never had a bearing problem.
I inspect the seal and replace it if I should find a nick.
I have not seen a spec on how many miles or when to pack the bearings. I usually do the job after 10,000 miles or once a year.
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Old Yesterday, 04:27 PM   #9
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I recently repacked my bearings and the 4 seals were only a total of $25 at O'Reilly. That isn't going to break my wallet.

I found very little grease in the bearings when I first packed them. In the end I decided to pump the hub full of grease in addition to hand packing, under the theory that more grease was better than too little. But I'm probably just wasting grease.

The problem with just pumping in grease is that you are skipping the inspection step. Perhaps do that every 2-3 years? Packing is easy enough that I'll just do it each time, though I'm doing this only ever other year as we put so few miles on the rig. Hopefully we'll get out there more often over time.
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Old Yesterday, 05:34 PM   #10
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I havenít packed wheel bearing in years. What size seals am I looking for?
Thanks,
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Old Today, 04:09 PM   #11
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Originally Posted by SactoSteve View Post
I havenít packed wheel bearing in years. What size seals am I looking for?
I just took the seal to the auto parts store and they figured it out. They were giddy at first because the seal had numbers on it, but they didn't match anything in the database, so they went by dimensions. And that worked fine.

I suppose the only trick is if they don't have enough. Then you are stuck, but I suppose you could finish the wheel you started. I bought spares, as well as two extra sets of bearings and races. I could go measure for you, but I wonder if the micro-minnies all use the same size. You probably need to take one into the store.

The first time I packed mine it took a lot of time. Well, it took a lot of time for the first wheel. Then the other 3 went pretty fast. In the end I think it was a lot less work than hauling everything to a dealer. Plus I have some confidence now I could do this on the road while waiting for AAA+ to come to the rescue.
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Old Today, 04:17 PM   #12
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Quote:
I wonder if the micro-minnies all use the same size.
I had the same thought.
We have several car parts places very local so your approach should work fine.
Thanks for the response.

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