Hi, I'm a farm owner. I recently built a 20-ton hydraulic press for pushing bushings and bearings, and for straightening bent shafting. It works fine -- two-hand operation, a motor spool control so I can "nudge" work, and a two-stage pump to give good ram speed with a high end pressure.
But the NOISE! It darned near drives me out of the shop!
I've bunkered the pump/tank affair with concrete blocks and earth, and with a 2" thick drywall cover. That vastly reduced the noise coming directly from the pump. But the high pressure line (about 8' long), and even the press frame itself, just "rings" LOUD at the gearotor's frequency.
I guess I'm sensitive to that sound. But if I spend a couple of hours re-bushing an entire machine, I'm worn out from the sound.
I don't like wearing earplugs or muffs... they prevent me from hearing other important sounds in my work environment; so I'd like to eliminate the noise source.
My background is electronics, not hydraulics. I envision something like a "low pass filter" (r/c network) eliminating the "ripple".
Would I be correct in assuming that an air accumulator near the pump would eliminate this racket? Maybe that, and an oriface or flow control valve either upwind or downwind of the accumulator? I don't want to spend the money if it won't help.
If that's not the solution, or if there's more to it than that, I'd sure appreciate some help.
LLoyd