That's what I thought at first, but I was thinking of this kind of scraper:

SCRAPER CATERPILLAR 621B - YouTube

We had a pair of those at FOB Wilson that were constantly springing air leaks, and six of them at the AT in West Virginia that I went on last month. They're terrible machines. The brakes are lousy even when they work right, they have no traction (note the dozer pushing the one in the video), and they're easy to roll over it the operator isn't careful. Add to that the fact that every government owned one I've seen was a 1985 model with an iffy maintenance history (at best), you have yourself a real pile of junk.

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.