Laing DCC Pump Stalling

_Ben_

_Ben_

_Ben_

Associate
Joined
25 May 2006
Posts
5
Has anyone had a problem with the Laing DCC pump stalling? Mine stopped last night and was unnoticed until the system crashed when the CPU temp went through the roof (encoding video at the time). I drained the loop and checked the impeller was free, reassembled the pump and it ran fine for another two hours then stalled again. Is this a common problem with the pump? Is there something I can do or check to stop it from happening again?

The pump I have was supplied with the Alpha cool water cooling kit I bought from here back in June.

Cheers

Ben
 
hi there,

Ive got the same as you. "MCP-350" Its stalled twice since ive had it. For about 1year iirc.

hit it and has been fine for months. cant really say why it used to do it. :confused:
 
I'm running an MCP350 pump also, I found that if you over tighten the 4 screws that hold the pump together it can cause the rotor impeller to bind with the pump housing and actually prevent it from even spinning, try slackening the screws off a little, but making sure the rubber o-ring is still being compressed, thus still retaining a good seal. I'm running mine at just under 8volts and it hasn’t stalled once, tis actually really hard to hear when running when undervolted :)
I've not had this problem with my D5 pump, it has the same pump design but you have a single screw cap that holds the pump together, it is really hard to over tighten it that way. much better pump imo.
 
Thanks for the replies. I checked mine and I do have the 10w version. I will slaken the bolts slightly and keep it running this weekend to see if there are any more problems. Seems strange that it's just started to happen now, although I have been away for a while so the computer wasn't used during that time.
 
Not sure if this will be useful for anyone but I think I found the problem with my pump. After a few hours of testing it would seem that from cold the pump would run fine for over an hour then it would slow before stalling. The first time the pump stopped a tap would get it spinning for a few more minutes but it would eventually stop completely and no tapping would help. As I had the pump running outside of the computer I found the base of the pump was slowly heating up and when it became too hot to touch the pump stalled. All the time it was this hot it would not run, cool it down and it was fine.

I carefully stripped the pump down and found that one of the thin wires forming one of the electromagnetic coils had either broken away from the circuit board or was never attached properly in the first place. The wire was barely long enough so if it was soldered down at some point it must have been under a lot of tension (all the other coil wires had a bit of give in them). I took half a turn off the coil, put a small loop in the wire, stripped back the green insulation coating and carefully soldered it back to the circuit board. I’ve now had the pump running continuously for four days without problem and the base is barely warm to touch so hopefully that’s fixed the problem.

In future if anyone else has a problem with their pump it would be worth seeing if it’s getting excessively hot, and if so you might have a similar problem.
 
Hum interesting, I can’t see the connection between it overheating then stalling and the loose stator wire though. Glad you got it sorted however.
I’ve just picked up a new 10watt ddc pump for next to nothing, if it plays up I know where to look 1st :) would be interesting to compare it to my MC350 which is a DDC+ 18watt
 
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