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.
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.
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.
====== RECOMMENDED WIRE AND FUSE SIZE ========
Wire Size required
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
Free flow 14.0 14.0
5 ft. 13.0
14.5 7.8 5.4
10 ft. 11.5 15.0
15 ft. 10.5 16.0
20 ft. 9.0
16.5 8.9 6.2
'Flow rates and amperage will vary slightly depending
on pump loading (sanitation system design).