A lot of yellow

Just found this, a fairly new youtube posting, I wonder about traffic management...

http://www.youtube.com/watch?v=JE0h54IBaME

http://www.youtube.com/watch?v=MyMWqxsBasc

----- Links are "Fixed" now. (ADMIN)

Once again, I messed up a posting, the link is correct, just can't tap it....

https://www.youtube.com/watch?v=JE0h54IBaME

http://www.youtube.com/watch?v=MyMWqxsBasc

Thank you for cleaning it up

I just amazes me when I watch videos like that and don't see any rocks! I can even dig a hole to plant a bush around me without hitting rocks from fist size to boulders........

I have never run a scraper, on the bucket list.
Few questions;
1) working in tandem, which position requires the most experienced operator? I think there has to be a "team" thinking to make it look easy.
2) The videos show the second scraper always pushing the first to load, I assume so the second scraper and pick up the cute where the first left off
3) There a few times I saw individual unit not working in tandem, even being passed by the tandem teams, would that be a less experience operator, or someone who is hard to run in tandem with?

Some random questions from someone who doesn't know anything.

Like GP, take this as "not very informed" but I have run a 627 a few times with a second machine in tandem but been around some fleets of 657s with good operators. One reason I can think a "loner" might exist, would be for whatever reason, his "mate" machine is down for repairs or other reasons leaving his on his own. They do break down you know.

JanM

PS- Then once in a while, nature calls!

In the first vidio at the beginning, they were piling up going up the hill. Then you see the first scraper off alone. I think it was having a power problem. The job I was on they keep the slow dog limping and tagging on till there was a mechanic free to work on it. If an operator made his own call and pulled off the job with small mechanical problem, he was fired.

Merry Xmas happy new years fellows!!

The best part of both movies was video #2 about 3:17 minutes into it......is that an old 666 roasting around with a rake behind it?

Who cares about the air conditioned, dust free, satellite-radio-turned-up-so-loud-I-forgot-I-had-2-engines-flat-out, what’s-the-point-in-burning-30,000gallons-a-day-if-you-can’t-smell-it-in-the-air-cuz-this-pressurized-cab new iron....tell that drone pilot zoom in on the good stuff once in a while hey guys?!

Maybe he snuck away from a chapter meet down the street?

Thanks for the Great scraper shows!!! (Pun entirely intended)

Hi, Folks.
As I understand it - and I am open to 'key-wreck-shun' here - when loading twin power scrapers on their own, you do use BOTH engines or you're really no better than a single-engined scraper which is not very efficient at loading itself.

Ditto when push-pulling - and again as I understand it - both scrapers use both engines. There is somewhat more weight over the rear wheels of a twin-engined scraper than there is with a single-engined rig.

The rear scraper does not need his bail down until he is 'ackshully' loading 'cos while the front scraper is loading, the rear one is pushing the front one with his cushion push pad. By the time the weight really comes on that cushion push pad, it is not going to have much 'lift angle' on it to lift the rear wheels of the front scraper. On lowering the bail, from what I have seen, I suspect that most operators put the bail down at contact anyway.

Garlic Pete, there are usually only two reasons why a scraper's rear wheels might be off the ground while being push-loaded by a dozer:

1. Poor push operator technique carrying the blade too high or not paying attention - which amounts to poor technique anyway.

2. The push cat operator is trying to tell the scraper operator to pick up and get outa there.

A possible third reason is that the push cat is too big for the scraper with the lower curve of the dozer moldboard causing the scraper push block to ride up the blade 'cos it is just plain too low for that push cat. This would be VERY likely in the case of a D4 and Cat 40 scraper being push-loaded by a D9.

Picking the rear wheels of a scraper off the ground while loading alters the angle at which the cutting edge is engaging the ground 'cos the scraper operator hazta lower the bowl more to maintain his cut. NOT good.

When a twin-power scraper is being push loaded by a push cat, all-same 'rools' apply as for a single-engined scraper, enough engine revs to give adequate hydraulic power but NOT enough to spin the drive wheels and let the push cat do the hard work, with the scraper operator controlling the cut so that he doesn't bog the push cat down.

Just my 0.02.