Bud’s Posted July 15, 2019 Share Posted July 15, 2019 (edited) Hello there, I have a 1985 R688ST Econodyne, I recently had purchased a stud pilot to hub pilot conversion kit from Donnie at global truck sales, only to find out that the serial number on my truck does not match the line card on my truck. I soon found out that the bearing sizes Donnie sent me we’re too small after I tore the passenger side completely apart, I found out the spindle tube sizes were much larger than what the line card and Mack had told me. Once I realized the bearings and everything would not work I looked at the existing bearings that had came off with the hub assembly. My inner bearing is a 598A My outer bearing is a HM617049/HM617010 cone and cup Has anybody else came across this odd bearing combination? If so what is the proper hub for it? I have six bolt axles and I believe my rear ends are 44,000 pound. I cannot find any information on this odd bearing combo nor the proper hub part number. Any help with this would be greatly appreciated. Thanks,Rob. Edited July 16, 2019 by Bud’s Wrong size of the rears Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/ Share on other sites More sharing options...
Rob Posted July 15, 2019 Share Posted July 15, 2019 On conversions and such I've done, (usually spoke to Budd, or unimount) I've taken the wheel end apart and physically ensure what I have before ordering parts. Far too many times through the years parts or assemblies get swapped for one reason or another and the line set ticket is then in error. It's an honest mistake but does happen. Those guys at Global are pretty good about taking parts back if you cannot use them, but that doesn't help you much. 1 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427975 Share on other sites More sharing options...
6368 Posted July 15, 2019 Share Posted July 15, 2019 please post a pic of the axle end Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427977 Share on other sites More sharing options...
Bud’s Posted July 15, 2019 Author Share Posted July 15, 2019 Yeah..... I live here in northern Ontario, Canada the shipping is going to kill me sending this stuff back to Global in the US. I have searched the Internet high and low, have spoke to one mechanic and he figures that I can machine these hubs to fit the existing oversized cups and cones that are currently on my truck. It would be nice to know what the original inboard hub assembly part number is. I figured if anybody would know, it would be somebody on this forum. Mack built this truck with these rear ends in it, I can’t see it being the only truck in the world built like this. I did locate the original part number on the axle housing itself which is 19QF5236. The Inner bearing combination is set number 404,which isn’t bad as far as pricing. But the outer being Hm617049/HM617010 is ridiculously priced. Nothing has been easy for me when it comes to getting answers on this particular truck I have. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427978 Share on other sites More sharing options...
Bud’s Posted July 15, 2019 Author Share Posted July 15, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427983 Share on other sites More sharing options...
6368 Posted July 15, 2019 Share Posted July 15, 2019 Sorry , the end of the shaft where the six nuts go Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427984 Share on other sites More sharing options...
Bud’s Posted July 15, 2019 Author Share Posted July 15, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427985 Share on other sites More sharing options...
6368 Posted July 15, 2019 Share Posted July 15, 2019 Thats what i was thinking it would look like. I believe that is 44000 with stud pilot. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427987 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 (edited) @6368 Is that rare? Is that why the bearings are oversized? You wouldn’t happen to know the hub number that matches up with these 44,000 pound housings would you? Edited July 16, 2019 by Bud’s I asked another question Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-427989 Share on other sites More sharing options...
6368 Posted July 16, 2019 Share Posted July 16, 2019 Does the axle shaft you removed match the bolt patter on the hubs they sent you? also what bearings did they send you . Most 38, 40, 44 have a 3.750 id on the inner bearing ...yours 3.6250 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428002 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 My existing axles matched the new hubs that they sent me. Global sent me bearing sets 426 and 421 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428007 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 The seals that global sent me are SKF 42673 The OD fits, the ID of them is too small. The seals that are currently on my truck are 309-0960 which crosses over to an SKF 48000. The id is 4.75 and the od is 6.25. @Rob I found the stainless steel tag on the front rear end housing, but you’re saying that there will be stampings directly on the steel bowl of the axle housing itself? Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428008 Share on other sites More sharing options...
Rob Posted July 16, 2019 Share Posted July 16, 2019 45 minutes ago, Bud’s said: The seals that global sent me are SKF 42673 The OD fits, the ID of them is too small. The seals that are currently on my truck are 309-0960 which crosses over to an SKF 48000. The id is 4.75 and the od is 6.25. @Rob I found the stainless steel tag on the front rear end housing, but you’re saying that there will be stampings directly on the steel bowl of the axle housing itself? Mack housings do not have stainless tags I know of. Rockwell, (Meritor) axles do. Are these not Mack drop in from the top differential carriers? If they are front loading differentials the tag contains the information needed. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428013 Share on other sites More sharing options...
JoeH Posted July 16, 2019 Share Posted July 16, 2019 14 minutes ago, Rob said: Mack housings do not have stainless tags I know of. Rockwell, (Meritor) axles do. Are these not Mack drop in from the top differential carriers? If they are front loading differentials the tag contains the information needed. My differentials on my 1988 we just bought begs to differ. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428015 Share on other sites More sharing options...
mrgumby Posted July 16, 2019 Share Posted July 16, 2019 Does it have mack suspension on it complete pics of rears and suspension would help with tag numbers that you found Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428016 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Yes they are Mack top loaders CRD92 &CRD93 carriers 4.17 ratio camel back suspension 60” axle spread. @Rob where are you saying the information is on these axle housings? My top load carriers are stamped with their own information, i’m going to post a picture of the axle tag that I found on the housing, apparently a company called Hayes-Dana Inc. built these housings. serial#B310 144634 part #19QF5236 date-8/22/84 high strength steel Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428019 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428020 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428021 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428022 Share on other sites More sharing options...
Rob Posted July 16, 2019 Share Posted July 16, 2019 First set of Mack housings I've ever seen a tag on but newer than my exposure relates to. Rear suspensions with that cap over the trunion bar are usually bronze bushed, greaseable, and heavier than 38K rating. Probably 44K as referenced earlier. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428025 Share on other sites More sharing options...
kscarbel2 Posted July 16, 2019 Share Posted July 16, 2019 I'm still trying to figure out how this company could possibly know what to sell you, to change from spoke to disc. Only a Mack dealer, or the Mack Specifications Department via a changeover request, could accurately determine what the truck was built with originally...........and what you would need to effect the change. If the springs are Mack, what is the 4QK number stamped on one of the two "T's" at the ends of the springs? Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428030 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Yes Rob, I replaced the trunnion due to the fact that the shaft was completely worn out on my existing stand, they are bronze greaseable bushings. The original Mack Camelback spring packs have been replaced With aftermarket ones, hi did not look at the old ones as far as numbers being stamped on the T ends of the original packs. Global truck was able to find out the same information that the Mack dealer in Winnipeg told me. The carriers were swapped out by a old Mack dealer here in Thunderbay years ago. They removed the CRD/92/93 carriers that had a ratio of 4.42 and replace them with CRD/92/93 4.17 ratio carriers according to Mack Winnipeg . Both the front axle and both of the rear end axles were converted from spoke to stud pilot According to Mack Winnipeg. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428045 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428046 Share on other sites More sharing options...
Bud’s Posted July 16, 2019 Author Share Posted July 16, 2019 Would anybody know these part numbers that I posted? Those two emails came directly from Mack Manitoba,Located in Winnipeg. Any help would be much appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428079 Share on other sites More sharing options...
Timmyb Posted July 17, 2019 Share Posted July 17, 2019 You know you could have 38,000lb diffs. 38’s have a larger diameter spindle, and are always a fabricated housing. 38’s also have 6 bolt axles. I’ve got a 38 at our shed which is disassembled so I could grab bearing numbers if you’d like me to? Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/#findComment-428130 Share on other sites More sharing options...
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