To add to Ken's possibility of dirt, the rubber can also lose it's flexibility and take on a set. As for spending $100 dollars on a rebuild kit... it seems like a low percentage of the replacement cost.
My dewatering pump was a tri-plex diaphram style and it stopped pumping because of the diaphrams loosing flex. Being mid voyage I needed a solution "last night", literally. My poor wife stood there half covered in soap for 10-15 minutes before I gave up trying to fix the pump. Deck showers in 40° spring air are not the sought after adventures she was looking for. At the next port we promptly found a West Marine which had a special on deck washdown kits. A quick comparison showed that it was a similar pump design to what we already had with a higher volume & PSI, and lower price than it's counterparts on the shelf. Coincidentally $99. And it came with a coil hose, pistol grip spray handle, and quick disconnects all around. The wash down pump was a comfortable fit with no significant challenges. It is a bit louder than the original which was labeled "ShurQuiet" made by Shur pumps. Once we got home and had time, I found the original pump cost $~240 which made buying the rebuild kit for $65 a pretty easy decision. I've since been considering reusing it as a low volume bildge pump for removing the small amount of water that gets left by the Rule 500. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mar 9, 2015 8:00 PM, "Ken Heaton via CnC-List" <cnc-list@cnc-list.com> wrote: > Usually, if the diaphragm isn't ruptured, the problem is a little bit of > dirt or hair in the intake or outlet valves. > > Definitely worth taking it apart for a looksee first. > > Ken H. > > On 9 March 2015 at 18:03, Kevin Driscoll via CnC-List < > cnc-list@cnc-list.com> wrote: > >> I've got a Jabsco 36970, 2.8gpm diaphragm pump for emptying out the >> shower sump in the head of our 30-2.Similar to this one: >> >> >> http://www.westmarine.com/buy/jabsco--diaphragm-bilge-pump-4gpm-3-4-port--109951 >> >> It hasn't worked since got the boat (gets juice, piston moves up and >> down, but no suction. I took it off the boat this weekend but haven't had a >> chance to open it up yet. I presume it needs a service kit, but they are >> $99 USD at defender. Which seems like a lot of $ for rubber for a 25 yo >> pump. >> >> Question is: Is there an alternative pump that I might consider >> purchasing (other than a hand pump) that would work for very occasionally >> pumping out a shower sump? Ideally cheaper is better. >> >> Thanks >> >> _______________________________________________ >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go to the >> bottom of page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >> >> >> > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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