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The load chart on my Grove RT650 said 28,000 pounds at 30 feet radius but I found out this week that's only with outriggers fully extended.
I was checking the manual after a job last Tuesday and stumbled on a note I'd never seen before. Turns out if your outriggers are at 90% spread instead of 100%, your capacity drops by nearly 40%. I've been running ops for 4 years at this company in Houston and nobody ever told me that. I checked with the senior operator and he confirmed it. Our yard supervisor said most guys just eyeball the outriggers and never verify the spread. That stat blew my mind because I've probably cut corners a dozen times myself. Has anyone else had a capacity surprise from the load chart that you wish you knew sooner?
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gavinb971mo ago
...and that thing @hannah_perry said about safety factors got me thinking about a job I did on the north side back in March. We had a 50-ton Link-Belt setting AC units on a roof, and the site was so tight we had to run the outriggers at maybe 80 percent spread just to fit between two buildings. I was sweating the whole time, kept checking the bubble level every five minutes. We finished the lift, no problem, but I still double-checked the math when I got home and found out we were technically overcapacity by a good margin according to the book. The machine didn't groan or lean, but it made me realize how easy it is to slip into bad habits when you're in a hurry on a cramped job.
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hannah_perry1mo ago
My buddy runs a fleet in Odessa and says 90% spread is the norm on half his jobs because the sites are so tight, and he's never had a crane tip. The chart is designed with a safety factor of 4 or 5 to 1, so losing 40% still leaves you with a real margin above the actual failure point. Honestly, if you're bumping up against the rated limit that close, you're probably already running the job wrong anyway.
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wendyg431mo ago
Ever check your actual radius with a tape measure? I started doing that after a close call and found I was off by 5 feet on a tight site.
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