MCP655 won't turn on

guitarslingerchris

guitarslingerchris

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Oct 29, 2004
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Like the title says, my pump won't turn on!

I had it running for the last 2 days straight for leak testing, powered by my trusty old AT psu, while I was working on other things and then last night I began to work on it again. All I can possibly think of that I did to the pump was to mount it with zip ties and I removed the molex connector from it a couple different times to route it through the case differently. I'm almost 100% sure that it's not a jacked up molex connector as I've tried it on about 10 different connectors, wiggling it to make contact, but i'll pull the connector tonight and connect it by hand to make sure.

Anyone have any ideas why the pump would suddenly not want to turn on?
 
Does the power supply turn other things on - fans, hard drives, etc?
 
It's not the PSU, everything else powered on fine. I tried every available molex connector and then grabbed my old AT psu again just to double check.
 
I guess contact Swiftech about it, they have good customer service from what I've heard.
 
Did it ever, even for one second, run dry ?


If your tubing is long enough, hold the pump in one hand and give it a smack against the open palm of the other hand. Rarely they will bind up and a gentle jar will free them up and you will not have a problem again. So slap it around some, gently, Cant hurt. Might get it going.
 
BillParrish said:
Did it ever, even for one second, run dry ?
Click to expand...
Yes, unfortunately since my reservoir sits below the pump it did run dry for approximately 3-4 seconds when I was filling the system initially but as I said it's been running flawlessly after that, for 2 straight days.

BillParrish said:
If your tubing is long enough, hold the pump in one hand and give it a smack against the open palm of the other hand. Rarely they will bind up and a gentle jar will free them up and you will not have a problem again. So slap it around some, gently, Cant hurt. Might get it going.
Click to expand...

I'll definitely give this a try. I put in an email to Swiftech as well to see if they can give me any helpful info, if a good smack doesn't get it running then I'll drain the loop and take it apart tonight.
 
Well, I gave it a good whack a few times and that didn't seem to do anything so I drained the loop and dismantled the pump. I cleaned it up some, there was a minor amount of gunk built up, but nothing serious whatsoever. Nothing that I can see at all to impede it's operation, I can snap some pics if someone thinks they'd be able to tell me something, but I have no clue what's wrong.
 
I'm about ready to drive and hour south to Microcenter, since it's the only place I know of that's somewhat local and stocks this type of crap. Then if I can fix the pump I suppose i can return it later or sell it for someone else's benefit.
 
Running these pumps dry, even for 1 second can cause the ceramic bearings to burn up and fry, killing the pump. This is something that isn't covered by warranty and the reason that you always, always, always have the res directly before the pump to ensure it never ever runs dry. Sorry, but it seems like that's why your pump won't turn on.
 
Nope, it works just fine now. I checked the bearing, the inside of the pump is pristine now, there didn't look to be any visible wear from what I could see. I do have the reservoir directly preceding my pump, but it sits lower in the case than the pump so it was a struggle to keep it fed well.

At any rate, after completely tearing it down and jumping the power past the pump speed rheostat(?) it seems to work just fine.
 
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