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Subject: TWL: Re: Jabsco electric head problems
LRZeitlin@XXX.XXX
Date: Tue Jan 01 2002 - 11:12:11 EST
In a message dated 1/1/02 12:02:11 AM, Jim writes:
<< I know the pump is working because when I filled the bowl with water it
evacuated it in about 2 seconds flat with a very strong suction. But, it
won't draw a drop. Yes, the seacock is open, (I'm not quite that stupid!)
Tomorrow I am going to pull the intake line and check for a blockage, but I
find it hard to believe that it would have gone from a partially blocked
intake to a completely blocked intake in the couple of hours it took me to
do the rebuild. This one has me scratching my head..............????? >>
Jim,
If your Jabsco electric head is like mine, the intake pump uses a rubber
impeller to pump seawater thru a hose to the top of the bowl. The
evacuator/macerator pump is a simple cast bronze centrifugal pump on the same
shaft that is almost fail free. The impeller pump will refuse to suck up
water if there is a leak in the cover gasket. Check this first. The reduced
output you noticed before the rebuild may have been due to a partial blockage
in either the intake line (barnacles, seaweed, etc.) or a blockage in the
line to the top of the bowl (impeller shreds, seaweed, etc.). If the gasket
is OK and the intake line is clear, see if water spurts out of the pump
delivery port when you remove the hose to the bowl. If water comes out, the
blockage is in the hose. If not, the problem is the pump. By the way, are you
sure that you have the right impeller in the rebuild kit? Is it properly
keyed to the motor shaft? Is the pump housing cracked?
Have you considered using an old oaken bucket?
Larry Z
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