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Old 26-12-2007, 14:53   #1
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Stuck Waste Pump

Ok, I have been putting this off as long as I could but the inevitable is drawing close. When I bought this boat, the waste holding tank was pretty full. I figured to wait until I put it in the water to empty the holding tank but the problem that I need to deal with is the Jabsco pump. The pump is froze. The motor appears good as when I put power to it to test it, it tried to turn but the pump itself will not turn. I have taken the end plate off of the motor and turned the shaft manually but still, it will not turn when when I reassembled it. It was pretty stiff when I turned it manually.
What is the best solution to remove the pump to work on it or replace it?
There is no valve between the tank and pump. For obvious reasons, I really don't want to just open it and have it drain into the bilge .
Would the best option be to wait until I get it into the water and empty the tank?
Any suggestions?
For what it is worth, it is a flexible tank (which I understand may not be the best choice for a waste tank).


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Old 26-12-2007, 15:56   #2
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If it is a Jabsco macerator, check the impeller & replace it. A vane will be jammed in the macerator blade. If it continues to give trouble think of replacement diaphram pump made by Jabsco & it might not meet to the requirements of the regs but you will enjoy not having to repeat the job!!
I resorted to this fix & have never had any trouble since!!
Regards Bill Goodward

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Old 26-12-2007, 19:19   #3
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The reality with your installation is that sh*t does happen!
Sooner or later you are going to have to replace that pump, so unless you can free up the pump following Bill’s advice, then little choice but to use a conical bung to hold in the contents while you fix/replace the pump. After considerable cleaning and flushing of tank, install a valve prior to pump.
If ever I am mothballing the boat for a while, I usually flush cup of vegetable oil into the empty tank then run the pump-out for a couple of seconds to coat the masticating impellor.
( camphor oil or vics vapour rub works well under the nose)
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Old 26-12-2007, 21:43   #4
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I usually sterilize the whole system with chlorine bleach and cycle it a few times before digging in. At least I know the nasties are dead.

Life begins where land ends.
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Old 29-12-2007, 10:49   #5
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Pelagic - That's what I was afraid of Oh well.

David M - There is the problem. How can I cycle the system a few times before digging in?

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Old 29-12-2007, 15:44   #6
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you don't have a deck pumpout fitting?
If it makes you feel any better, macerators don't last long. They operate infrequently and are obviously exposed to corrosive urine , etc. as well as salt water assuming you have a salt water head intake and anything you try to prolong their life only serves to make you think you've accompished something. Macerators live in a corrosive environment and sit there for prolonged periods inoperative. It is more pleasant to simply replace the thing rather than fiddle with it.
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Old 26-09-2009, 22:51   #7
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the other end of the jabsco has a screwdriver slot to break it free.
been there. just give it a few turns by hand or an electrc screw driver.
;loosen the pump mounts so you can get to it.
then use salad oil regularly.

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