Jabsco Head Problem

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Mar 10, 2011
15
Hunter 31 Fort Lauderdale
I have Hunter sailboat with a Jabsco manual head that pumps directly into the holding tank which is empty. When I switch to "wet" the bowl it doesn't pump any raw water into the bowl but pumps the water in the bowl into the holding tank same as when I flip the switch to the right to "dry". I tried priming the head with fresh water but kept pumping the water out into the holding tank. The raw water intake seacock to the head is open and clear of obstruction. Any suggestions?
 
Dec 2, 1997
8,947
- - LIttle Rock
Sounds like a failed wet/dry cam

The cam is part #20 in the drawing on page 8 in the owners manual Jabsco manual toilet instructions The lever is supposed to move it to allow flush water in (wet mode) or block the flow of flush water, but it's not moving it to let flush water in. Wiggling the lever might unstick it temporarily, but the only cure is a new wet/dry cam assembly (not in the service kit). Call Jabsco...or consider upgrading to a new better quality toilet
 
Jan 10, 2009
590
PDQ 32 Deale, MD
If the top of the pump was removed for service or winterizing it is also possible the gasket, check valve, and cam were misassembled; mine was when I purchased my boat. Compare with the manual.
 
Jan 22, 2008
319
Hunter 29.5 Gloucester, VA
I just replaced my manual pump yesterday with one from West Marine $100. Mine was leaking and not pulling water well. Rebuild kit was like $70 so I just went whole hog got the whole thing, 15 min switch out. Well worth it to me.
 
Mar 10, 2011
15
Hunter 31 Fort Lauderdale
Thanks everyone for the help

Wow, that was fast. I can't say thanks enough for everyones input. I'll try replacing the cam 1st.



The cam is part #20 in the drawing on page 8 in the owners manual Jabsco manual toilet instructions The lever is supposed to move it to allow flush water in (wet mode) or block the flow of flush water, but it's not moving it to let flush water in. Wiggling the lever might unstick it temporarily, but the only cure is a new wet/dry cam assembly (not in the service kit). Call Jabsco...or consider upgrading to a new better quality toilet
 
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