Cat handbook says a 330 D with a 1.83 cuyd bucket and a 345C with a 3.0 cuyd bucket should make three cycles per minute, in clay, with an average operator, and a 60 deg to 90 deg swing angle. It may be a little less while loading trucks depending the operator.Using these numbers
The 330D should move 5.49 yds a minute, assuming your machine is able to work 50 minutes our of each hour that means 274.5 cuyd an hour.
The 345C should move 9 yards a minute, same with the 330D aprox 50 min of work each hour, that means 450cuyd an hour.
Again, there are a lot of variables, so this is a rough guess, and really depends on how many trucks you have, plus that assumes you can get the trucks under the bucket fast enough. From personal experience, Running a Komatsu pc300, with a 2 yard bucket, in a 12 hour day, with 15 trucks on a 4 mile round trip, i was able to load out 3,800 cuyds. in a day. Roughly 316 cubic yards an hour. No stopping for lunch of break. Minimal waiting for trucks. All in all, perfect conditions.
