dlerdmann1185 Posted July 29, 2021 Share Posted July 29, 2021 ’m currently in the process of restoring a model 45 that hasbeen sitting in our fire departments storage for quite some time. I’ve had to completely remove and disassemble every component of the braking system due to leaks and corrosion issues in the hydraulic components. In doing this, I obviously had to remove all the wheel assemblies. When I popped the passenger rear axle loose, a small amount of gear oil ran out. I popped the axle back in and proceeded to drain the gear oil. I removed the fill plug first and stuck my finger in the hole and didn’t get any fluid. I pulled the drain plug and got about 4quarts out of the chunk. I removed the axles and wheel assemblies and found that the bearings were packed with bearing grease, but there was also gear oil mixed in with thegrease. My question is, were the rear wheel bearings originally wet bearings or did someone previously pack the bearings with grease by mistake? I also need to know thetype of gear oil used in the rear end. Thank you for any helpyou might be able to provide. Quote Link to comment https://www.bigmacktrucks.com/topic/67556-1947-model-45-rear-end-and-wheel-bearing-questions/ Share on other sites More sharing options...
terry Posted July 30, 2021 Share Posted July 30, 2021 Some of the early mack wheel bearings had a inner seal to separate inner and outer bearings, the inner was packed with grease and the outer run in gear oil. most guys just knocked out the inner seal and run oil in both bearings. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/67556-1947-model-45-rear-end-and-wheel-bearing-questions/#findComment-477621 Share on other sites More sharing options...
dlerdmann1185 Posted July 30, 2021 Author Share Posted July 30, 2021 3 hours ago, terry said: Some of the early mack wheel bearings had a inner seal to separate inner and outer bearings, the inner was packed with grease and the outer run in gear oil. most guys just knocked out the inner seal and run oil in both bearings. terry Thanks for the info! Quote Link to comment https://www.bigmacktrucks.com/topic/67556-1947-model-45-rear-end-and-wheel-bearing-questions/#findComment-477624 Share on other sites More sharing options...
mechohaulic Posted August 31, 2021 Share Posted August 31, 2021 changing over to all oil use to mean changing seal type. leather grease seals didn't do well holding back oil. todays world (i'm 70 old school); leather seals probably don't exist. LOL. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/67556-1947-model-45-rear-end-and-wheel-bearing-questions/#findComment-479157 Share on other sites More sharing options...
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