Firstly, apologies to OP for hijacking this thread.
nzpatch, the Wabco scrapers on the Crib job belonged to an outfit from CHCH who's name I won't taint this web board with.
Now for people who don't know the terrain of where we are conversing about, it's as steep as a hens face. Now Frank was clearing slip on the above mentioned road with his then new pride and joy so had decided to get a photo of it. So he backed it out to the edge of a sheer drop so it was at the point of balance, got off, wandered up the road and took the pic. He reckoned his mind was on other things as he climbed aboard and threw it into gear and opened the tap. It was just as well it was powershift cause he was in reverse. As the dozer was going the edge Frank had the presence of mind to bang into forward and it only just climbed up and over the edge onto the flat of the road. I never knew if he took any more photos but I think his pants would have been pretty full that day. Just a lapse in concentration