Hello, I was hoping I could gather some advice from you all. I am still very new to pumping, I've only been pumping about 6 months now, and I am having trouble controlling the flow of concrete so that it doesn't free-fall in my boom and splatter on buildings and what not. I operate a 2019 Schwing 39SX and typically set up with a 5" to 4" reducer to a 4" cutoff tip hose. What I've found will work is if I flatten out my tip boom but obviously this wont be ideal in all scenarios. I've read online that a S-tube or Ram's Horn on the end of a hose works well for this application but I've also heard that using that method is against OSHA regulations. What setups or methods do you guys use? Would a reducing hose be the way to go? Is there something I can be doing with my stroke limiter to alleviate this problem? Any help would be very appreciated, thank you.

man if you are reducing down to 4" you should be able to turn your volume control to 5-6 and get a steady stream in a few strokes , I usually will start full throttle and then back off once the boom is full and honestly with a 4 inch you shouldn't even have to be at 5-6 on volume control , but the throttle up then down once boom was full always keeps my hose with a steady stream .

I agree with Pudg. With a 4" hose you should be able to start pumping at above 1400-1500 rpm between 5-6 and fill the boom within a few strokes then back off the rpm a bit.

Thanks for the advice pudg2 and Concretejutsu. After I get a good flow going how much should I turn down the RPM's? I typically only turn my RPM's up to 1200-1300.

I would start at 1500 or above and then drop down to 1200-1300 but honestly I usually try to find that sweet spot where my boom is not bouncing but have a steady flow and the boom operates well.

I used a lay flat hose on my slower paced jobs no splatter at all. 

The top of a road cone on the end of the hose works.