Broken rear axle Mack dump truck

[DMiller]

The ones I remembered had These for Axle Ends

Newer Heavy Axles had these

 

[cuttin edge]

Yes I understand that----but pumpkin does not fit in that sentence.

Two piece axles--I don't remember.

The cap on the hub, and the axle were seperate? The cap on the 2 piece looked like a Chinese hat

 

[Truck Shop]

The ones I remembered had These for Axle Ends

Correct--I just don't remember the last year for those. The only good thing about those was
--pull the cap remove the axle reinstall the cap for towing.

 

[cuttin edge]

The ones I remembered had These for Axle Ends

Newer Heavy Axles had these

exactly

 

[cuttin edge]

The 1992 I drove was a heavy spec truck, but had the one piece.

 

[DMiller]

Last DM Series I saw with MASSIVE Third Members had the Eight Bolt heads, that was a 95/97 somewhere in there.

 

[terex herder]

Axle ends look like DM 1st picture. It prolly wont be for a few months to get into it.

 

[DMiller]

Few months!!

 

[crane operator]

Few months!!

He likely doesn't need it to plant, probably needs it to harvest.

 

[terex herder]

Nah, its pretty small/useless for farming. Was hauling broken concrete from tearing down old building, then hauling dirt to fill in the hole. Finished hauling the dirt with wheel loader. I put a 1/4" floor in the bed so don't have to be super careful with the concrete.

 

[terex herder]

Broken axle shaft. Its easy for me to go catastrophizing about broken pinions or other expensive parts that would scrap the truck.

17 spline both ends, 39 11/16 long. No visible part number. I see several that fit that description on the net. Did Mack have few enough axles they are likely to fit? Or how to find a part number?

 

[DMiller]

Should be a Rear Diff ID tag somewhere on it, if OE to truck Dealer should be able to ID by SN

 

[Bootheal]

Was it pumpkin or punk’n???

 

[DMiller]

Punkin
Trchno lingo!!!

 

[terex herder]

 

[MarcusZ1967]

Ford 9inch Pumkin better if it had the big N

 

[Truck Shop]

Mama don't allow no stinking Pumpkins, Punk'n, Pumkin's around here, better mind
what mama don't allow-cause mama don't allow no pumpkins around here.

 

[Johndeere120]

Used to work for a company and one day a guy who was new dumped dumped clutch and same thing happened. Axle shaft twisted and snapped. Easy fix but the problem is you really have to take it all apart now and clean it. I knew a guy who changed his and didn't get all the pieces and chewed up the bearings. It's a pain but if you do it right you'll have piece of mind. I would at least pull the axles it's pretty quick to do it and see if they're snapped if not somthing else inside broke but 99% it's the axle

 

[terex herder]

Ok, fixed now. Looks like at some time this axle shaft was in a wheel end where the bearings went out. Lots of scaring on the wheel end of the shaft and heat marks from rubbing. The shaft was a clean 90 degree break, not the elongated spiral usually associated with torsion failure. It didn't happen on this housing, as there was no scaring in the housing. If it hadn't broken this load, it would have happened shortly later. Not much left holding it together, and another break starting 1/8" away from this one.

This was a 17 spline axle both ends. And Mack has both shallow spline and deep spline in 17 splines.

 

[Truck Shop]

Good glad it was easy!