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Old 08 March 2008, 12:19   #11
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Sounds electrical to me

Is there any electrical circutry in the pumps check the polarity

also which way round is the earth on the system

just some of the problems I have encountered
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Old 08 March 2008, 12:56   #12
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If you've made a collection on dead pumps, I would suggest sending them off to the manufacturers with a letter explaining the problems you're having and get them to analizse the sample ones to see if they can suggest what's happening.
Or just crack em open and have a look.

The broken ones have suffered mechanical stress of some sort. Do they bend as you screw them down?
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Old 08 March 2008, 13:07   #13
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Low voltage at the pump?

Have you checked the voltage at the pump when its running?

Low voltage might cause the motor to run hotter?
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Old 08 March 2008, 15:07   #14
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Or just crack em open and have a look.

The broken ones have suffered mechanical stress of some sort. Do they bend as you screw them down?
I was thinking more of a play on the Manufacturers sympathys and that there might be a possibility of having one or two new ones back in return as well as them finding out that the problem was. It's also very important for the manufacturers to find these problems in the field as they might be able to make a better product in the future.
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Old 08 March 2008, 15:59   #15
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I have had one of the Rule electronic auto pumps since lastt January and although my boat does not sit on a mooring so the pump does not get used as much it has been faultless so far and I have frequesntly seen it clearing water that is full of sand or mud from the deck.

BTW the rule auto works by the pump automatically running for a couple of seonds every 30 secs I think it is. If there is water present the load on the motor trigger the pump to continue pumping until the water has cleared and the load on the motor goes.

Clever stuff really!

Tim I really think you have some kind of electrical problem.

My suggestion would be to run a fresh set of cables and possibly a new switch as well.

Are you running the dual rocker switch option on the Rule auto which allows you to turn it on to auto or manual?

Chris
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Old 09 March 2008, 21:09   #16
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Low voltage might cause the motor to run hotter?
No, less voltage = less heat.

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Old 10 March 2008, 03:43   #17
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No, less voltage = less heat.

Nick.
No.

On a motor, lower voltage equals slower running which equals lower back EMF equals higher current equals more heat.
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Old 10 March 2008, 05:31   #18
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No.

On a motor, lower voltage equals slower running which equals lower back EMF equals higher current equals more heat.
absolutely ! a motor will try to draw the current it needs so if there is a blockage and its not getting as much power as it wants then it can cause overheating of both the pump and the wiring.
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Old 10 March 2008, 07:29   #19
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1 "disintegrated" - the red top part came away from the white body.
Is the red bit on top with the auto ones?

I'd send half of the scrappers back to Rule and half off to a local uni or technical college as a "project"

We've had a non auto 4000gph for 4 years with no problems other than a fuse holde in the console failing.
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Old 10 March 2008, 15:08   #20
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absolutely ! a motor will try to draw the current it needs so if there is a blockage and its not getting as much power as it wants then it can cause overheating of both the pump and the wiring.
Well if that's the case check that the wiring run against the size of cable so that you don't get too much Voltage drop for the Current needed.
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