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Roy Suomi 02-27-2008 19:03:26 75.185.164.191 29154 Report to Moderator	OK Mack guys, Here"s one for you..I drive a "98 Mack for snowplowing..I blew an axle shaft on it today..[rt side]..I drive it like I paid for it...No Lie.... Allison World trans. HD 6 speed..On a forward to reverse shift, I heard a bang..It backed up OK..When I shifted to forward it made a noise , like at every rotation of axle.. Hitched a ride back to shop, loaded my pickup with tools , pulled the axles and got it ready for a tow back to the shop..Can"t for the life of me understand why?? The other Mack went thru 3 axles in it"s life ..I sorta thought it was being horsed around , now not so sure..It was a 6 speed stick..Are they a weak link?? I wouldn"t think so...Any ideas....Thanks [Reply]  [Send Email]
Rob in Indiana 02-28-2008 13:36:06 99.205.227.101 29163 Report to Moderator	Re: Mack RD-690P Axle Shaft in reply to Roy Suomi, 02-27-2008 19:03:26   My grandfather was a long time mack dealer in Ohio and a broken axle shaft while not unheard of is something we seldom seen. The bulk of his customers trucks were lowboy tractors, coal haulers, and oil field trucks. we built many blown rears but dident see many axle problems. Sorry I cant really give you a answer to your problem. As for axle shafts being designed as a "safety valve" to protect the ring and pinion..... thats a load of bunk.   [Reply]  [No Email]
Leland 03-05-2008 21:23:45 206.62.11.5 29193 Report to Moderator	Re: Mack RD-690P Axle Shaft in reply to Rob in Indiana, 02-28-2008 13:36:06   not a bunch of bunk according to a retired eaton engineer I lived by ,he help design a lot of drive componetes in his day with them   [Reply]  [Send Email]
Leland 02-27-2008 23:14:39 206.62.11.9 29157 Report to Moderator	Re: Mack RD-690P Axle Shaft in reply to Roy Suomi, 02-27-2008 19:03:26   they are made to give like a sheasr bolt so you don't over torque the diff and destroy the ring and pinnion .   [Reply]  [Send Email]
noncompos 02-27-2008 19:47:44 65.102.20.70 29156 Report to Moderator	Re: Mack RD-690P Axle Shaft in reply to Roy Suomi, 02-27-2008 19:03:26   If nothing turns up here try bigmacktrucks.com. good luck.   [Reply]  [Send Email]