patricia32•18d agoProlific Poster

Old foreman told me I was dredging too fast near the intake pipe

I used to run the cutterhead at full RPM all the time thinking I was getting more done. An old foreman from the 80s watched me for five minutes and said "you're just stirring up mud, not moving material." Slowed it down to about 60% and started getting way cleaner slurry with less wear on the pump. Anyone else had to unlearn bad habits from going too fast?

3 comments

3 Comments

jana76918d ago

That 60% sweet spot is exactly what the old-timers at our yard swear by too. One guy told me he can hear the difference in the pump load and knows right away when someone is running it too hot. Idk why it's so hard to trust that slower actually moves more material, but I've definitely learned that lesson the hard way.

stella2217d agoMost Upvoted

60% seems like a nice round number but I gotta wonder if these old timers are just repeating what they heard 30 years ago and nobody ever tested it. I've run pumps wide open for years and never seen any major difference in material moved compared to when I eased off. Maybe on some specific setups it matters but most guys are just guessing, right? A guy hearing a pump load difference could just be confirmation bias talking, hearing what he expects to hear. I'm not saying slower is always wrong but turning it into some sacred rule feels like overkill. Let the machine do what it's built to do unless you've actually measured a difference.

jason_stone5917d ago

My BIL runs a concrete plant and he says the 60% thing came from the old hydraulic pump manuals that had actual RPM curves printed in them. Not a rule someone made up but literally what the factory tested.