topo Posted December 19, 2017 Share Posted December 19, 2017 Years ago I was told that they used 1/3 of the weight it took to fail . Quote Link to comment https://www.bigmacktrucks.com/topic/51983-how-do-mack-axles-get-there-weight-rating/ Share on other sites More sharing options...
mrsmackpaul Posted December 19, 2017 Share Posted December 19, 2017 I don't know if 1 third would be enough as the weight coming of some of our rough roads I think would multiply out a lot greater than that something like I reckon 10 or 20 times the weight of what they ate rated Paul Quote Link to comment https://www.bigmacktrucks.com/topic/51983-how-do-mack-axles-get-there-weight-rating/#findComment-387731 Share on other sites More sharing options...
41chevy Posted December 23, 2017 Share Posted December 23, 2017 (edited) It's the downward force that each of the axles will support, the safe working limit. It doesn't account for the tires, spring packs and trunion. Edited December 23, 2017 by 41chevy Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/51983-how-do-mack-axles-get-there-weight-rating/#findComment-388001 Share on other sites More sharing options...
Popular Post kt_Engineer Posted January 5, 2018 Popular Post Share Posted January 5, 2018 On 12/18/2017 at 10:04 PM, topo said: Years ago I was told that they used 1/3 of the weight it took to fail . It is a combination of suspension and axle housing that dictates the GAWR (Gross Axle Weight Rating). Different suspensions put different types of loads into the axle housing (Ex: Torque reactive Air suspension can twist load into axle housing especially with high C.G loads). Depending on the suspension the housings are tested under different load conditions (Ex: 2g to -0.5g vertical load while applying 1g lateral load for some spring suspensions as against a twist load ~ 150k in-lb for air suspension) for couple of 100,000 cycles. No cracks or failures are to be seen to allow high degree of reliability in the field. The max. rating is what axle housing (including spindles) are capable of withstanding. So a 11mm fabricated steel axle housing (tandem) can be rated to 46k lbs GAWR with a camelback suspension while it will be good only upto 40k GAWR with a AL401/HAS401 suspension. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/51983-how-do-mack-axles-get-there-weight-rating/#findComment-389084 Share on other sites More sharing options...
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