Hypro roller pump makes noise

Torque454 · Jul 27, 2011

My brand new hypro roller pump makes a growling type noise. Kinda like a car or truck thats low on power steering fluid. When you turn the wheel the growls. This is the same kind of noise. The noise goes away as the engine slows down, but speed it up and it growls like crazy.

Its a directly driven pump, 2600 rpm 4101 4 roller Hypro pump. Silver series. (i do have the engine limited to 2500 to avoid over speeding)

Is it normal to growl, groan, whine or whatever youd call that noise is that it makes (like a low power steering level like mentioned)??

I cant find any air leaks in the suction line anywhere, everything is tight and not leaking. It is pumping from a tank, through 7 feet of hose, and the tank is on a trailer, with the pump on the ground so there is plenty of gravity feeding going on.

Help please!?

Bird · Jul 28, 2011

Personally, I've only used a 6 roller Hypro pump and, no, it did not make any noise. It was very quiet. It's not a big deal to take one apart to look at the rollers or see if there's anything unusual in there. Is it doing its job right; i.e., pumping whatever liquid you're using?

Torque454 · Jul 28, 2011

I'm just pumping water right now and it is pumping great. Lots of pressure and volume. It doesn't seem to be pulsating or anything.

Bird · Jul 28, 2011

Torque454 said:
I'm just pumping water right now and it is pumping great. Lots of pressure and volume. It doesn't seem to be pulsating or anything.

I wonder if it's just that the water isn't much lubrication. Anyway, I don't really think you could go wrong either way; i.e., ignoring the noise and continue using, or take it apart and see what it looks like inside.

Torque454 · Jul 28, 2011

I wouldn't think the water would be causing a problem but i'm no expert. It really sounds to me like its somehow sucking air. Its being fed from a 5/8" hose off a tank, maybe that cant supply all the water it needs VIA gravity. IDK.

I just dont want to hurt the pump any. Its about a $300 pump although I didn't pay that much for it.

Bird · Jul 28, 2011

I really have no idea. I used a 6500 series pump myself and they don't run anything close to the rpm that 4101 is rated for; 540 to 1200. Makes me wonder if that whine is normal for that kind of speed. What kind of engine are you using? I think it's most common for people to use their tractor PTO, so the pump itself is only turning 540 rpm. But I used to have a spray rig (forget who made it) that had a 25 gallon tank, a 3hp Briggs & Stratton engine, the 6500 series Hypro pump, pressure regulator, and 100' hose all mounted on a little cart with 4 wheels. There was a gear reduction "transmission" between the engine and the pump so even with the engine rpm set pretty high, the pump was turning considerably slower.

Torque454 · Jul 28, 2011

I'm using a direct drive Honda 5.5 hp speed reduced to 2600rpm.

Bird · Jul 28, 2011

I haven't seen one like that so I'm afraid I don't have any other answer.

oldballs · Jul 28, 2011

I'm no expert but have used that pump with a 55 gal tank sprayer using insecticide, or 2-4 D herbicide or glycosphate on different occassions. I don't recall any unusal noise. The pump does get louder as the pressure is increased up to the max (less than 150 psi). Since your pump is "new", there shouldn't be any maintenance problem such as corrosion. Several years ago I spoke with the HYPRO technical people and found them quite helpful. Try 1-800-445-8360. The owners manual has a lot of good service and maintenance info. Good luck It sounds like it is starving for fluid flow. Maybe the in line filter is clogged up.