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Well, after working through all four rear hubs today this is my conclusion to this thread. The problem was a dry bearing. The brakes were fine on all four hubs. I thought the brakes were an issue on the right rear, but after cleaning and going through all the motions, everything was fine. At...

So.., the left-rear>rear looks good. Plenty of grease and oil mixed. I will go ahead and repack with grease while I have it apart. I feel very lucky to catch the right-rear bearing issue before a major failure. It was barely lubing itself with gear oil. If you haven't checked your wheel bearings...

Okay, just to clear up an misconceptions about grease or oil bath. You must grease the bearings, period! The TM says so! Yeah, oil lubrication is part of the equation, but they need to be packed with grease. Certainly not a 1/4 gallon per hub like I found on XM818. The hub cavities had more than...

Brain drag too! Well, I forgot that when the axle shafts are pulled your hub is going to spin if the brakes are not en-gauged. It's been a few years since I have done this, plus a different brake system.:? Got the brake caged, so I'm ready to adjust, pack, and reset the bearing tension. I guess...

Thanks! Believe me, there is no guessing around on this end. That's why I'm asking these questions and looking at the TM(s). Looks like the problem is a brake shoe dragging. So, I've got to adjust the brakes on that side. Might as well check them all as I replace the tires with new 395 XLZs. I'm...

Okay. I'm not familiar with caging the spring brakes, but I've seen the article and know what you are referring too. The M939 series truck with air brakes is new territory for me. I really like the simplicity of the 800 series truck. I'm sure working knowledge of the 939 series will come fast as...

Thanks for all the replies. I hope my questions and replies are going to the thread. I'm new here, so I haven't spent much time on learning the forum interface details. Going to go pull this hub off now. I will post some pictures of what I find. Hopefully nothing!

No infared temp test. Just to the touch, and there was considerable difference. Too hot to leave your hand on it for more than 5 seconds. Explain the stuck wedge? I'm not familiar with this condition.

I will be following the TM instructions from this point forward. Someone said spin the axle checking for drag. Unless all 4 wheels are off the ground, I'm not spinning anything. So, I assume I must drop the propeller shaft on the rear to isolate it singly. When I re-worked my M818 bearings and...

There is an outer seal. It goes against the outer bearing. It's not a "discard" or throw away part unless it is damaged. If the other hubs have grease, then someone forgot to grease this one.

10/4 on that! This truck sat for years after the depot overhaul. I felt like the best thing I could do is run it and see if any problems surface during first 100 hours or so. How is oil maintained in the hub cavity? Obviously, it comes from the differential and flows outward. If the differential...

I concur. About 1/4 cup of oil came out when I pulled the axle flange off. There is no visible oil leaking into the brake drum. Both seals are good. I'm not taking any chances. Going to pack those bearings all the way around.

I guess I have to remove the rear propeller shaft to isolate and spin the rear hubs? I'm changing out tires, so I have tires off on both sides of the rear axle.

They did not seem to be too tight. I assume you set the bearing tension the same way you do on the 800 series truck? I'm haven't gotten that far in the TM on hub & bearing maintenance for the 939 series. I've read the brake PM, so that is the first thing I will check in the morning. Should I...

There is an outer seal. Everything looks the same as my M818. Will it hurt to lightly pack this side with grease to see if the temperature goes down? I mean very light application.

Wow! So they are oil bath... So does differential oil travel down the axle shaft? I guess my question is... how does the oil move out to the hub and bearings?

There is no visible grease on the outer bearing? Dang? I guess the only thing keeping this hub going was the gear oil that spilled out when I remove the axle. No sign of any burning or metal residue. I've got to review the 939 TM for hub removal. I have done 800 series with hydraulic brakes, but...

Thought I would ask for diagnoses advice, but I will search the forum for any threads related to possible cause for excessive heat difference on one hub. My right rear hub is much hotter to the touch others. All others are normal. At this time I have the axle removed, ready for the inspection of...