Frost bite is the center edge on the bowl and extends down farther,like said above.
As far as running witht the lip up i did alot.Just wanted to make sure when i got back to the cut it was set already for what i was cutting in.Have been tired and get to the cut and part way through just watching ahead of me with several scrapers loading at the same time in the cut going on feel and look to see the bowl was just sliding along with out the dirt loading.More so when out on the town to late.
Different types of dirt i would keep the lip tight,not opened to wide to let the dirt come in as fast.Like when finishing,or when we were working in glasier clay.The kind that start up in the scraper and before you know it is 20ft tall the breaks and fall over the back of the scraper.If you would watch you could quickly close the lip and the slab would quite and fall, not always,then open the lip easy and the the dirt would start loading again,this time more normal.Didn't always work ,but helped.Exceptions to every rule!!!!!!!
If you was loading mud,and had to go aways in the cut before you hit hard ground,so you wouldn't get the push cat stuck i would run with the lip wider open to watch how it was loading,then close as it got started.Again sometimes you needed to skim the whole cut ,would only get a half load ,but didn't stick the pushcat.Nothing ,made for a bad day then burying the pushcat.It was always better to be standing or setting on your scraper watching the other scraper hand pulling the cable.
If you can see the rooter bits(corner bits) they would help you gage how much you was cutting.Plus watching how the dirt is coming in the scraper bowl is another sign how things are going.On bigger machine watching the hoist cyclinders you could tell.Again with the lip up to the cross beam you can see how much dirt is going in the bowl,but in sucky dirt and mud it will try to suck deeper with the lip up.Theres where the feel comes also and timing ,when to know to close the lip down or open it up farther.Been in muddy cuts where you was loading the mud good then all of a sudden a bid chunk would start sliding in front of the bowl.Hopefully you was getting close to the end of the cut and could pickup and drag it out of the way.If not there was a good change it would stick you.
The biggest thing is getting started right.Coming in the cut close to the ground and as fast as you can,and in my days D9 or two picking you up you didn't want to get it stuck in the gorund to hard until you got picked up,then you let up on the throttle get set in,other push cat picks you up and adjust throttle and your off.Unless you hit a big boulder or rock.Another story right.
Always hated being push with at straight dozer,that when i wanted to get off and beat the crap out of some of them guys pushing me.Bang ,bang ,all day long.There was like everything a few,very few that even with a straight dozer could pick you up smooth with out hardly a nugde.My brother was one of them.:usa