I'd like to replace a Shurflo pump that's rattling badly and is barely pumping water. It was that way when I bought the rig two months ago--I'm told it was installed new a year prior.
I was just about to start undoing the wiring when something caught my eye that just doesn't look right. Expert opinions, anyone?
There's a blue/white pair (hot/ground, respectively) from the converter to the pump. This first pair's blue wire is nutted to another pair's blue wire--that second pair disappears into a wall.
The first (converter) pair's white is nutted to the pump's ground (black) and the second (wall) pair's white is nutted to the pump's hot (red).
Isn't there something wrong here? Shouldn't both blue wires be nutted to the pump's hot and both whites to the pump's ground? Or maybe I've got 110 on the brain here.
Anyway, I don't want to plug my known working pump into the existing setup only to have it start within minutes behaving like the one that's coming out. Alas, I'm no electrician--I'm shooting from the hip here.
A meter can tell you instantly. They're dirt cheap. And vital if you have an RV.
Bingo. Yep, that was what it took.
I whipped out my hi-tech fancy $3 circuit tester and figured it out. Don't know why I didn't think of it before I posted.
It was wired correctly; it was just the colors that were throwing me off. The wall pair likely goes to some fixtures and back, because its white wire has juice. Thus, red on the pump. The pump is catching the juice on the way BACK from the pair's end destination.
So the new pump is in and is humming away nicely. With greatly improved pressure I might add :-)
You might want to take apart the old pump, and see if there is something in the inlet screen of the pump, or perhaps one of the pump valves.
If you can clean out some dirt, then you will have a good spare pump, and be ready in case it happens again. Also if you did find dirt, you will know to clean and rain your fresh water tank a couple of times to get out any remaining dirt.
I am sad to tell you the new pump will likely rattle just like the old one.
As to the wires.. If the hookup you have now works, DO NOT MESS WITH IT, maintain the same pattern on the new install.
HINT: extend the hose lines, using good FLEXIBLE lines so they form a loop on both the inlet and outlet side of the pump, Loop can be up and over or right and left or down and under, (Depending on the lay out) But make sure there is a loop of flexible line.. The fittings should be 12 inch IPT thread, and they make flexible lines for hooking up sinks, toilets and such that work very well for this. That may well fix your rattle.
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377
My, so many answers to a li'l ol' question! This is a friendly place :-)
I wouldn't be so quick to rip out the pump and put a new one in. First of all they do rattle.
Well, the new pump shows WORLDS of difference in the pressure, so I'm guessing that was the problem. There is now, but when I bought it there wasn't a filter installed (image here), so there's probably damage to the impellers. I'll be checking it soon, so I'll know for sure then.
I have had NO water, low pressure and excessive rattling and ALL three were due to something OTHER than the pump.!
I've heard that a lot, come to think of it. In any case, it sure can't hurt to clean out the screens. I'll do that.