I finally figured out I was running my cutterhead too slow for 3 years

Was on a job last Tuesday clearing out a silted-up drainage canal near the old mill pond. Kept wondering why my production was barely half what the older guys were getting. Then the mechanic stops by to check on me, listens to the engine for 20 seconds, and goes "You're lugging it down. Let it spin up to 1800 at least." I had been running at 1200 this whole time thinking I was saving fuel. Has anyone else had a moment where a small adjustment like that completely changed your digging rhythm?

2 comments

2 Comments

the_wren13d ago

Funny you mention that, because I spent two seasons running a 6 inch pump at half throttle thinking I was being gentle on it. Turned out the manual literally said to run it at 85 percent governor speed for sand and gravel slurry. Soon as I bumped it up, the impeller wear actually went down and I was clearing sumps twice as fast. Fuel savings from lugging it just meant I was paying for it in downtime and rebuild kits. Took a shop foreman chewing me out to realize I was the problem, not the machine.

jessica_robinson2313d ago

Running pumps at half throttle thinking you're saving them is like driving everywhere in second gear to save gas. The engineers who wrote that manual actually did the math on wear patterns and fluid dynamics, you know? Lugging a pump creates all kinds of nasty cavitation and vibration that eats up impellers way faster than running it at its sweet spot. I learned that lesson the hard way too with a submersible trash pump on a dewatering job. Nothing like a $900 rebuild kit to teach you that the manual isn't just a suggestion.