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Jabsco Head Pump-gctid389486

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    Jabsco Head Pump-gctid389486

    The manual head pump on my 289 abruptly quit pulling water into the head. Removed the top of cylinder and replaced the O ring, but still no intake water. Pump is the verticle pull/push type with about a 6-8 inch stroke with flapper buttons to move right or left to either fill or flush. Could a guest flush these and plug intake hose with toilet paper? Any ideas to check will be appreciated. Thanks - Arnie

    #2
    I just rebuilt mine, West Marine has the kit for 70.00. It wasn't the o rings in my case but the flat rubber membrane on the top. The flappers were cracks and wouldn't make a good seal.

    (did I just say I blew a seal in my toilet?) ew
    Boatless at this time

    A veteran is someone who, at one point in their life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including their life."

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      #3
      Arnie wrote:
      The manual head pump on my 289 abruptly quit pulling water into the head. Removed the top of cylinder and replaced the O ring, but still no intake water. Pump is the verticle pull/push type with about a 6-8 inch stroke with flapper buttons to move right or left to either fill or flush. [COLOR]"#FF0000" wrote:
      Could a guest flush these and plug intake hose with toilet paper? [/COLOR]Any ideas to check will be appreciated. Thanks - Arnie
      I don't have a schematic but you should search for one.

      The principle with the manual Jabsco is this.......All the stuff in the bowl, including paper etc. is on the underside of the o-ring and cylinder. At no time should paper get to the intake side.

      On the downstroke this 'stuff' is pressure flushed thru' the 'joker one-way valve' to the holding tank or overboard. On this same downstroke water from the thru' hull is sucked into the upper chamber above the o-ring if the flapper button is selected to flush. If selected to empty...no water is permitted to enter as the flapper valve, allowing entry, is physically closed.

      On the upstroke either flush water or air is expelled into the bowl...depending on selection.

      If selected to flush and water is not present there is either a leak preventing the vacuum, or the flapper valve is malfunctioning or not completely selected to either side or the intake line from the thru' hull is blocked.

      The latter may be check by swiching off the thru-hull, disconnect the hose there, put the hose into a pail of water and try again. If that is OK then slowly open the thru' hull to see if water gushes out...be prepared to close quickly

      :go-

      Other than that the mechanism at the top of the pump is easily taken apart...just make sure you identify which part fits where and any fault should be evident.

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        #4
        I had the same problem and, after reading up on the topic, found out it's fairly common. There happened to be a rebuild kit on the boat when I bought it, so I went ahead and did the rebuild. Works fine now. If it happens again, rather than buy a rebuild kit, I would purchase a complete replacement pump unit. 80 dollars or so at binnacle.com

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          #5
          So these things use sea water?

          I just bought a boat with one and have no idea how it works.

          I pumped it and it does pump water into the bowl, but a little water does squirt out from around the pump.

          It appears there are a couple of thru hulls for it. One is up high and says waste on it and has a cap. Is that whats called the pump out?

          The other one is lower, but still above the water level. Is that for the macerator to pump the poop out?

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            #6
            One problem I have seen with the Jabsco is there is a tiny little spring that goes in the upper part of the pump assembly. I don't have the schematic but there's only one spring and it's tiny. Any way, I rebuilt the pump and somehow missed this spring. So after tearing it down and putting it all back together 3 or 4 times I finally realize what's missing and look in the bag that the rebuild kit came in and low and behold there is this tiny spring. Put it in and everything works again.

            They are pretty easy to work on so I would buy the rebuild kit unless you have reason to believe that there is a problem with the pump housing or fittings. Then just buy a replacement pump.

            Comment


              #7
              green650 wrote:
              So these things use sea water?

              I just bought a boat with one and have no idea how it works.

              I pumped it and it does pump water into the bowl, but a little water does squirt out from around the pump.

              It appears there are a couple of thru hulls for it. One is up high and says waste on it and has a cap. Is that whats called the pump out?

              The other one is lower, but still above the water level. Is that for the macerator to pump the poop out?
              The upper will be the pump-out. After removing the cap an adaptor is screwed in and the holding tank sucked out where there is a facility to do that. The lower will be the outlet where the macerator pump will exit the waste, if done in an unrestricted zone. There should also be a vent line to vent the holding tank.

              If the pump head leaks it will need a repair kit to fix unless the screws are just loose.

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                #8
                Be very careful when you take it aprt that it goes back EXACTLY the same way. As mentioned it could be that little spring. Happened to me as well

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