wishthisMackwouldwork Posted 20 hours ago Share Posted 20 hours ago Hi everyone, thanks for all the info in the forum. So I decided to go through and paint my 1986 RM6864X over the winter, but when i got into the rear axle to fix a seal, there was evidence of a bearing failure, and the previous owner tried to put it back together without replacing the hub. The hub bearing is cracked, and the seal face on the axle housing was pretty damaged. All I can find out about this axle is that its a 6.14 meritor according to old notes on my parts manual No tags anywhere giving the model. Getting a new hub is near impossible, but I would love to figure out if there’s a replacement that fits Pilot wheels instead of Budd. All the part numbers in my book are obsolete. I guess the main thing is retaining the axle with a speedi-sleeve (anybody use one?) and finding the hub. The local dealer can get the bearings and seal. The front of the spindle is about 3 1/16” in diameter. Any idea about what’s out there that fits these axles? Or perhaps the axle model? Or contact the Mack museum? Thank you! Tristan Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/ Share on other sites More sharing options...
mrsmackpaul Posted 15 hours ago Share Posted 15 hours ago Get some photos of the offending axle and axle housing Measure the hub, I can see the bearing is busted but can't see the hub damage Can clearly see the axle damage A seal like this will probably work fine here as the rubber bit doesn't spin Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566366 Share on other sites More sharing options...
The Heinz Posted 6 hours ago Share Posted 6 hours ago I've seen someone order those old type hubs here, very recently in fact. The dealer couldn't do anything for you? Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566402 Share on other sites More sharing options...
wishthisMackwouldwork Posted 3 hours ago Author Share Posted 3 hours ago No the local dealer can not find the hub from the parts numbers, as they have been discontinued. I wish I had a part number off of it. Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566421 Share on other sites More sharing options...
Geoff Weeks Posted 2 hours ago Share Posted 2 hours ago Ok, start with the bearing numbers, both inner and outer cup and cone. Get the seal bore and part where the seal rides diameters. Unless it has a real odd bearing spacing or brake spider placement, I suspect a newer outboard drum type hub could be fit. My guess is it will be a typical 20K/40K hub. Hub used on 20K single or 40K tandem axles. If you can get the aprox bearing spacing that will also be helpful. I am assuming std 16.5x 7 rear shoes? Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566423 Share on other sites More sharing options...
Joey Mack Posted 2 hours ago Share Posted 2 hours ago Isnt the hub number cast into the hub? Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566426 Share on other sites More sharing options...
Geoff Weeks Posted 2 hours ago Share Posted 2 hours ago (edited) They are on spokes, but not so sure about Disk. The next thing you need to know is the bolt circle for the axle studs and count and the diameter of the studs. 7" B/C and 5/8" dia studs 8 count are common, but 3/4" and other sizes are used. 580 outer bearing cone space a little over 4" apart are common on the spindle if in the range I mentioned. If it falls into the common hub, then you could replace with outboard drums and common hubs. https://www.webbwheel.com/online_catalog_hubdetail.php?hn=26431--MLT Edited 1 hour ago by Geoff Weeks Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566428 Share on other sites More sharing options...
Mark T Posted 1 hour ago Share Posted 1 hour ago That housing is probably a more popular 23,000 pound Meritor or Rockwell piece than the mystery hub is making you think. Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566433 Share on other sites More sharing options...
Geoff Weeks Posted 1 hour ago Share Posted 1 hour ago https://graphicvillage.org/meritor/pb2006.pdf Another catalog. You aren't likely to find inboard drum hubs, but have a good chance of finding out board. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566434 Share on other sites More sharing options...
Geoff Weeks Posted 32 minutes ago Share Posted 32 minutes ago I just realized I mis-read the 1st post, It isn't the hub that is cracked, but the bearing race. Knock out the race and inspect where the bearing goes. Get a new set of bearings, or at least an outer race, and see if it will press firmly into the hub. If so, you are good to go, if not you can look to replace the hub or have it built up and re-machined to hold the bearing. Building up and re-machining will cost a few bucks, but everything you have can be re-used. New hub means new drum and may be new wheels. If your lucky it will hold a new race and can go back together. Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566440 Share on other sites More sharing options...
Joey Mack Posted 27 minutes ago Share Posted 27 minutes ago I saw the cracked race, also curious about the hub. I really dont think its cracked.. Quote Link to comment https://www.bigmacktrucks.com/topic/74995-rear-hub-disaster-in-1986-rm-with-meritor-axle/#findComment-566441 Share on other sites More sharing options...
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