JABSCO 18590 series DC macerator pump (12, 24, or 32 volt models)

The JABSCO 18590 series DC macerator pump unit is the ideal solution for emptying marine holding tanks when not in a discharge restricted area. The macerator section grinds waste down to a particle size of l/8" maximum so it can easily by pumped through a 1 " ID discharge hose. The pump section is self priming, permitting the unit to be mounted above the tank in a convenient location. (For optimal efficiency, locate pump as close to holding tank as possible.)

Empties most recirculating toilets in less than two minutes: empties a typical 30 gallon holding tank in less than 3 minutes.

The 18590 series waste pump will macerate and pump all waste and tissue normally found in marine and recreational Vehicle waste systems. IT WILL NOT HANDLE HARD SOLID OBJECTS, SANITARY NAPKINS OR RAGS.


The JABS macerator pump unit has been designed to handle waste, toilet tissue, and facial tissue. It will also handle solids such as filter tip cigarettes, cigars and chunks of soft fruits or vegetables less than 1" size. It will not pump solid objects like peach pits, tags, or sanitary napkins. The holding tank and pump should be flushed with several gallons of water after each pumpout. DO NOT run pump dry. Make sure the battery is fully charged. The DC motor is suitable only for intermittent duty; do not run for more than 15 minutes continuously.

Note: After long periods of non use, the macerator pump may not turn freely. Pour a cup of water down pump discharge line to help free the impeller.


Locating the Pump:
The JABS macerator is self-priming to a six foot lift when impeller is wet, four foot when dry, and may be mounted in any convenient point in the waste discharge system. It may be mounted in any position or angle without affecting performance. Use the rubber grommets provided to absorb vibration. Do not over tighten mounting screws. For optimal performance, mount the pump as close to tank as possible.

Plumbing Connections:
Use minimum 1 1/2" ID non-collapsible, radiator type, suction hose. ( See Marine Hose Update. ) Two inch hose may be slipped over the inlet and clamped on smooth area of port.

The macerator inlet port may be attached to port of PAR "Y" waste valve (model 45510-0000) as illustrated in Diagram A. Use a saw to remove barb on waste valve port. Coat outside of Valve port and inside of macerator port with AS glue. Quickly insert valve port in macerator port insuring both mounting bases are in alignment.

All suction connections must be airtight and free of sharp bends or restrictions. If a waste deck fitting is installed (for dockside pumpout); it too must be air tight to ensure proper priming. Use minimum 1" ID hose for discharge and connect to thru-hull fitting located slightly above waterline.

Wiring Hookup:
For permanent connection, use heavy duty stranded copper wire to avoid excessive voltage drop. Undersized wiring is the biggest cause for motor failure next to motor submersion. Consult recommended wire and fuse size table for correct size.

NOTICE: Connect orange wire to positive circuit and black wire
         to negative for proper rotation. Failure to connect
          wires as described will damage unit.


                           Wire Size required

                   Connection Length
    Model          Between Battery and Motor           
   Voltage           1 'to 10'       10' to 20'        Fuse
     12 v            No. 14          No. 10           20 amp.
     24 v            No. 16          No. 16           10 amp.
     32 v            No. 16          No. 16          7.5 amp.

   =========          HEAD CAPACITY TABLE     =========

                             Load in  AMPS

    Head (ft.)   GPM   12 volt   24 volt   32 volt
    Free flow   14.0     14.0       7.6       5.2
         5 ft.      13.0     14.5       7.8        5.4
        10 ft.      11.5     15.0       8.1       5.6
        15 ft.      10.5     16.0       8.6       6.0
        20 ft.       9.0     16.5       8.9        6.2

   'Flow rates and amperage will vary slightly depending
     on pump loading (sanitation system design).

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