Awwww .... Poor Peterbilt

[ThaddeusW]

Makes you wonder what goes through peoples minds. Obviously not much . At least have a pusher truck to help for cripes sake. Hey John, I bet your DM800 would yank that load with no problem.

[Lmackattack]

and he was going nice and steady like a good drive would. no throttle revs? must have been a weak joint? front end was looking a little light. Glad his brakes held!!!!!!!

[jryoung]

That is what you get when you don't have a dog on the hood and cammelbacks under your ass!

[ThaddeusW]

and he was going nice and steady like a good drive would. no throttle revs? must have been a weak joint? front end was looking a little light. Glad his brakes held!!!!!!!

True, but that is one hard looking pull. Without the proper axles or help from a pusher its no surprise the drive shaft let go. Either he is a company driver just doing what he was told or someone who bit off more than he could chew.

[B61TENDT711]

if you watch you'll hear the drive shaft catch the truck wiggles and continues on a little ways further then it let's go

a Mack M123A1C would have made that pull easy with the big ol brute of a V-300 Cummins rapping up the hill in the lo hole humming along at 2,800-3,200rpm's while them twin 65K-lb rear's with 10.11 gears howled the whole way . . .

I love them military truck they ID tag 65,000lb yet when you run the part number off the rear ends they come back as 120,000LB rear end's and the 18K-lb steer axle come' back as a 52,000lb steer axle . . .

the GI under rating system why do they do it ?

Mike

[Double L]

Too bad it wasn't a Volvo!

[RowdyRebel]

if you watch you'll hear the drive shaft catch the truck wiggles and continues on a little ways further then it let's go

Almost looked as though he didn't select a low enough gear, lugged the engine, and attempted to downshift on the hill....and snapped the drive shaft when the weight of the truck + gravity fought the torque + gearing of the engine & transmission...the drive shaft proved itself to be the weak link.

I've seen a lot of coal haulers attempt to "get a run" at the coal pile, start lugging & slam the transmission into the next lower gear...surprised more of them haven't dumped their drive shafts right there on the coal pile. Then again, the company trucks are cut back to MAYBE 425 HP and they are only 80,000 pounds...not 600+ HP pulling 400K

[Gambi80]

I've seen a lot of coal haulers attempt to "get a run" at the coal pile, start lugging & slam the transmission into the next lower gear...surprised more of them haven't dumped their drive shafts right there on the coal pile. Then again, the company trucks are cut back to MAYBE 425 HP and they are only 80,000 pounds...not 600+ HP pulling 400K

I like to watch people do that, just for pure amusement.

Only we've got quarries around here with some pretty steep drives out. You either see a guy creeping up in first gear or sitting there with parts strewn about.

[RowdyRebel]

I like to watch people do that, just for pure amusement.

Only we've got quarries around here with some pretty steep drives out. You either see a guy creeping up in first gear or sitting there with parts strewn about.

I usually use 2nd @ 1600 RPM's...unless you consider L to be 1st, then I'd be in 3rd...unless you are counting splits as gears, then it would be 5th or 6th depending on where I've got the splitter lever....

If you can't push a little harder on the throttle and accelerate, you're in the wrong gear.

[B61TENDT711]

I usually use 2nd @ 1600 RPM's...unless you consider L to be 1st, then I'd be in 3rd...unless you are counting splits as gears, then it would be 5th or 6th depending on where I've got the splitter lever....

If you can't push a little harder on the throttle and accelerate, you're in the wrong gear.

That would be every is the wrong gear then in my 6.5-T to bad they don't let you test drive'em loaded or i would have never bought it, i have tossed about ever up grade to it i could in between break downs

quick as heck empy doggy as piss loaded . .then again should i of expected any else from an engine designed by Detroit

I'm not saying it doggy under 12,000LB load or 7,000LB load it gets doggy under a 4,500lb load or 3,000lb load starts slowing down at a 1,500lb load n by 4,500LB's its a puke.

Its got 4.10 gears came factory with 32" tire i dropped down to 30" tire it got better but not enough to notice it so i went back up to the 7.50-16's truck really should have 4.56's . . . high reving low power turbo diesel sure sound's like an 8V-71 to me . . .

Mike

[RowdyRebel]

That would be every is the wrong gear then in my 6.5-T to bad they don't let you test drive'em loaded or i would have never bought it, i have tossed about ever up grade to it i could in between break downs

quick as heck empy doggy as piss loaded . .then again should i of expected any else from an engine designed by Detroit

I'm not saying it doggy under 12,000LB load or 7,000LB load it gets doggy under a 4,500lb load or 3,000lb load starts slowing down at a 1,500lb load n by 4,500LB's its a puke.

Its got 4.10 gears came factory with 32" tire i dropped down to 30" tire it got better but not enough to notice it so i went back up to the 7.50-16's truck really should have 4.56's . . . high reving low power turbo diesel sure sound's like an 8V-71 to me . . .

Mike

Dang...my Mack has 4.17 rears with 44" tires (11R24.5) grossing over 80,000...walks up just about anything I can get traction on

[B61TENDT711]

yea but my 6.5 is a 3/4ton pick up truck . . . Your Mack has 11R24.5's ? My Mack has 12.00R24's there 49" tall i have Goodyear G177's

My Mack will run everyplace yours won't

I Run these Quality tires:

GoodYear G177:

Firestone T831

Mike

[Speed]

Mike;

The reason I think they "under-rate" the axles,(and probably just about everything else) is because they figure there may be soldiers' lives on the line,and military drivers are inclined to use a truck pretty hard under normal circumstances,and much harder under fire,so better to not leave anything to chance;make sure the truck was up for whatever might come up. Of course,I could be wrong. I think it's kinda like when the Power Company here bought new trucks,they used to spec them out just as tough as was possible,figuring there'd be a high percentage of drivers who "could break a steel ball in a sandbox." Cheaper to order it right to begin with than have to keep fixing stuff.

[RowdyRebel]

Mike;

The reason I think they "under-rate" the axles,(and probably just about everything else) is because they figure there may be soldiers' lives on the line,and military drivers are inclined to use a truck pretty hard under normal circumstances,and much harder under fire,so better to not leave anything to chance;make sure the truck was up for whatever might come up. Of course,I could be wrong. I think it's kinda like when the Power Company here bought new trucks,they used to spec them out just as tough as was possible,figuring there'd be a high percentage of drivers who "could break a steel ball in a sandbox." Cheaper to order it right to begin with than have to keep fixing stuff.

If you've ever talked to a lineman (or at least the ones around here) they'll tell you that their first priority is to get to the line they have to fix...even if it means charging full speed through the ditch into a muddy field. The wrecker or another truck will be along in a while to pull 'em back out, but they have to get to where they need to do the work in order to get the power back on...

...and when the drivers ain't gotta worry about the repair bill, ya gotta spec it tough