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    macerator pump fail-gctid813111

    I decided to fill my holding tank with some water in order to clean it out a bit but to also allow me to exercise the macerator pump. With the tank about 1/3 full I pressed the pump button at the helm and it sounded like it was working however 4 or 5 seconds in to the experiment it stopped abruptly. I located the fuse (20amp) and it was blown. I ran out of time to try replacing the fuse and continuing but I'm wondering if anyone has had this experience. Should I spend some time lubricating the parts on the exterior of the pump that I can see? It appears to be the original pump 1990. Thoughts? Thanks.
    1990 3288 twin 150 Hinos
    previous: 1964 28' Owens express cruiser, v8 crusader

    #2
    The pump shaft should have a groove that is accessible from one end, often under a rubber plug. Use a flat blade screwdriver on this groove to turn the the shaft. This may free it and get it working again. I recommend that you do this or use the pump once or twice a year to keep it free.

    Also, many Bayliners have undersized macerator pump wiring. This results in an excessive voltage drop, reduced pump power, stalling, and fuse burnout. I've had good luck with running fused, heavy gauge wires directly to the pump from the MBSS and a good ground, and using a relay to actuate the pump from the switch.
    1999 3788, Cummins 270 "Freedom"
    2013 Boston Whaler 130 SS
    Anacortes, WA
    Isla Verde, PR

    Comment


      #3
      Mbss?
      ..........
      Why Naut
      1996 Bayliner 4087
      Twin Cummins 250 HP 6BTA5.9 M2
      Anacortes, WA

      MMSI 338311223

      Comment


        #4
        Thanks Norton Rider. I remember thinking that the wiring looked kind of skinny. I'll get in there and free it up and try to grease it where possible, replace the fuse and see where that leaves me. I don't want to replace it but I guess I'll have to see what happens.
        1990 3288 twin 150 Hinos
        previous: 1964 28' Owens express cruiser, v8 crusader

        Comment


          #5
          "Boyd" post=813118 wrote:
          MBSS?
          Main Battery Selector Switch
          1999 3788, Cummins 270 "Freedom"
          2013 Boston Whaler 130 SS
          Anacortes, WA
          Isla Verde, PR

          Comment


            #6
            I've gone through 4 macerators (Jabsco) in 5 years, but this one seems to be doing better. What have I done differently? Basically I use it all year and I've taken to dropping a teaspoon of cooking oil into the head each time away from the dock. So far so good..
            ________________
            1989 Bayliner 3270

            Comment


              #7
              The other thing that I think kills many of these is that they are typically mounted low and always have "stuff" in the line which will compromise the seal and get to bearing/bushings.

              If you are replacing look at how to either make it mount higher than the tank or at least so it is not the low spot that will have "stuff" all of the time. If you can rotate so the motor end is up (this is recommended in the install guide)
              1999 Sandpiper Pilothouse - Current
              1989 3888 - 2011-2019, 1985 Contessa - 2005-2011, 1986 21' Trophy 1998-2005
              Nobody gets out alive.

              Comment


                #8
                or quit eating so much sweet corn.
                Dan
                Frostbite Falls, Minnesota
                Claudia V. III
                1988 - 3218
                Gas Drives

                Comment


                  #9
                  "Nikko" post=813268 wrote:
                  I've gone through 4 macerators (Jabsco) in 5 years, but this one seems to be doing better. What have I done differently? Basically I use it all year and I've taken to dropping a teaspoon of cooking oil into the head each time away from the dock. So far so good..
                  Well - Macerator #4 (in 6 years) failed - or so I thought. I'd pumped the tank (it was quite full so pump run time was lengthy). When it was empty I flushed through about 6/7 gallons of water back into the tank, and had about half that pumped out when phht... dead.

                  This weekend I wormed my way into the cave and prepared to swap the pump. After snipping the hot wire, I powered it directly form another source just to see if the pump was truly dead. The pump worked... Turned out the fuse popped.. It's never popped before... So when put all this together I always reach the same conclusion - impedance eon power CCT if too high, voltage drops, current rises, motor gets hot and phht..dead. Only this time the (20A) fuse caught it.

                  In an attempt to see if I'm right, I added a pilot relay right a the macerator CCT. The "old" macerator on/off CCT now just has to power the coil on the relay - the actual power to the pump is from a new source (power post I added to the cave during the battery re-wire) shunted through the relay and not only has about 2' of #10 wire supporting it.

                  First test - the motor sounded stronger than any of them ever have! Let's see if this works. And if it doesn't..the spare macerator is still aboard
                  ________________
                  1989 Bayliner 3270

                  Comment


                    #10
                    About 5 years after we purchased our boat, the forward head macerator quit, blowing fuses. I disassembled the unit and all seemed fine with the motor section. When I installed the impeller, the unit required quite a bit more torque to rotate.

                    Everything looked OK, so I added another gasket to the cove plate. The unit has been working for 6 years since. No clue if/why the impeller swelled or changed after 5 years, but all is good now.

                    Comment


                      #11
                      "Nikko" post=822810 wrote:
                      "Nikko" post=813268 wrote:
                      I've gone through 4 macerators (Jabsco) in 5 years, but this one seems to be doing better. What have I done differently? Basically I use it all year and I've taken to dropping a teaspoon of cooking oil into the head each time away from the dock. So far so good..
                      Well - Macerator #4 (in 6 years) failed - or so I thought. I'd pumped the tank (it was quite full so pump run time was lengthy). When it was empty I flushed through about 6/7 gallons of water back into the tank, and had about half that pumped out when phht... dead.

                      This weekend I wormed my way into the cave and prepared to swap the pump. After snipping the hot wire, I powered it directly form another source just to see if the pump was truly dead. The pump worked... Turned out the fuse popped.. It's never popped before... So when put all this together I always reach the same conclusion - impedance eon power CCT if too high, voltage drops, current rises, motor gets hot and phht..dead. Only this time the (20A) fuse caught it.

                      In an attempt to see if I'm right, I added a pilot relay right a the macerator CCT. The "old" macerator on/off CCT now just has to power the coil on the relay - the actual power to the pump is from a new source (power post I added to the cave during the battery re-wire) shunted through the relay and not only has about 2' of #10 wire supporting it.

                      First test - the motor sounded stronger than any of them ever have! Let's see if this works. And if it doesn't..the spare macerator is still aboard
                      Your experience mirrors mine. Most Bayliner marcerators are inadequately wired and there's too much voltage drop. A relay combined with correct gauge wire and a good source of power is the way to go.
                      1999 3788, Cummins 270 "Freedom"
                      2013 Boston Whaler 130 SS
                      Anacortes, WA
                      Isla Verde, PR

                      Comment


                        #12
                        update: Well I removed the old macerator and discovered that the motor end of it was mounted below the pump end of it and a ton of 4200 (or some equivalent) had been added everywhere to prevent further dripping/leaking of "stuff" from pump into motor. When I cracked open the macerator - intent on rebuilding it- I couldn't believe it worked at all considering all the corrosion everywhere. So I begrudgingly replaced it with a new one et voila problem fixed. Thanks for all the advice, I am starting to believe that since these pumps let go quite quickly it may feel like I rent this pump rather than own it.
                        1990 3288 twin 150 Hinos
                        previous: 1964 28' Owens express cruiser, v8 crusader

                        Comment

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