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Electrical Connections
WARNING: If the pump is operated in an area containing flammable vapors, the wire leads must be joined by
insulated mechanical locking connectors. Loose or inadequate wire connections can spark, resulting in an
explosion resulting in property damage, injury, or death. All electrical installations should be done by a qualified
electrician.
Pump must be protected with proper size fuse as specified on the motor label.
Pump should be operated on a separate circuit.
Pump should be connected to properly sized momentary switch. This prevents pump from damage due to dry run
condition.
Switch should be near pump. This will allow operator to hear change in pump sound when tank is empty.
NOTE: For proper operation motor must rotate counterclockwise when viewed from pump end.
12 Volt System
Min. Wire Size (20 Amps)
Total Wire Length *
3% Drop
10% Drop
feet [m]
GA
1-10 [.3-3]
#10
11-20 [3.3-6]
#8
21-30 [6.4-9.1]
#6
30-60 [9.1-18.2]
#4
*length from power source to motor
and back to ground.
Plumbing Connections
Pump should be mounted as near as possible to tank to minimize dry run. Pump is self-priming to a five-foot lift
when impeller is wet, four foot lift when impeller is dry. Pump is more efficient if mounted near the holding tank.
Installations should be done by qualified marine tech.
INLET:
Always install pump with a shut-off valve between pump and holding tank.
Hose:
Use 1-1/2" ID [non-collapsible vacuum rated] hose on inlet [suction] side. Use stainless steel hose
clamps on all sanitation connections.
Flange:
To mount to 1-1/2" female flange, inlet barb must be cut off just before threads. Seal threads and
hand tighten.
Warning: Any air leak on inlet side can cause pump to run dry and can damage
impeller and impeller housing. Check all inlet side connections, even
those on deck plates. All runs should be smooth with no kinks or sharp
angles.
OUTLET:
Use 1" minimum ID hose on discharge side of pump. Connect to thru-hull fitting above highest
heeled point above waterline. Vented loop installations must vent at least 10" above highest
heeled point above waterline. Use stainless steel hose clamps on all sanitation connections.
Operation:
INTERMITTENT DUTY ONLY!
Pump switch must be near pump and tank so operator can hear pump running.
Make sure shut-off valve to pump and dump valve [if equipped] are both open. Turn on momentary switch
and pump out tank. When tank is empty, pump will get louder with a high pitch sound. Immediately turn
pump off, or damage to impeller and housing will occur. Do not run pump dry for more than 15 – 20
seconds. Flush tank and pump with water after each use. This macerator will handle normal waste,
tissues, cigarettes, fish scales, etc. It is not designed to handle large hard objects such as large bones or
fruit pits.
Periodic Maintenance and Storage:
occasionally. After periods of non-use, impeller can stick. To loosen, open rear shaft cover and turn motor
shaft clockwise with a flat tip screwdriver. Then replace shaft cover. For extended periods of non-use,
pump impeller can be lubricated by running a small amount of mineral oil through holding tank system.
Electrical Installation Checklist
GA
√ Separate circuit from power source
√ Proper size momentary switch mounted near pump
#16
√ Proper wire size to length
#14
√ Proper fuse size and type
#12
√ Insulated wire connectors
#10
Flush with water after each use. Check wire connections
Part and Kit Lists
Item
Description
1
Cover Screw
2
Cutter Housing
3
4
5
Top Cutter Blade
6
Bottom Cutter Blade
7
Top Wear Plate
8
9
10
Bottom Wear Plate
11
Impeller Housing
12
Shaft Seal
13
14
Motor Assembly
15
16
Rear End Shaft Cover
17
End Cap Screw
18
Baseplate Assembly
19
Kit Name
Impeller
Pump Head
17
16
15
18
19
Exploded View
page 2 of 4
Maintenance: Turn off all power!
Qty.
Rear end cap/ motor shaft slot access:
3
Loosen end cap screws (17). Rotate shaft cover (16) to access
1
slot on motor shaft.
O-Ring
1
Pump disassembly:
Hex Nut
1
Remove 3 cover screws (1). Remove cutter housing (2) and o-
1
ring (3). Remove hex nut (4) and cutter blades (5) & (6). It
1
1
may be necessary to hold the motor shaft steady. Insert a
Gasket
1
screwdriver into slot on motor shaft (see slot access above),
Impeller
1
or slip a thin wrench (9/32" [7mm]) behind blades onto flat of
1
motor shaft. Remove top wear plate (7), gasket (8), impeller
1
(9) and bottom wear plate (10). Remove impeller housing
1
(11) and shaft seal (12). It is not necessary to remove slinger
Slinger
1
(13).
1
Pump reassembly:
O-Ring
1
Make sure slinger (13) is on shaft. Make sure shaft seal (12)
1
is inserted properly into rear of impeller housing (11). Slide
2
impeller housing (11) onto motor shaft. Seat bottom wear
1
plate (10) into housing. Twist impeller (9) onto shaft and
Hex Bolt
2
into housing with a counterclockwise motion. Install gasket
Kit #
Kit Items
(8) and top wear plate (7). Install cutter blades (6) & (5) with
tab on bottom blade aligned with motor shaft flat. Secure
94-571-00
8, 9
motor shaft with screwdriver or wrench (9/32") [7mm] and
94-570-00
3, 7 - 13
tighten hex nut (4). Position o-ring (3) and cutter housing (2)
in place, and install cover screws (1).
Α Maintenance Tip!
14
Loosen stuck impeller by turning
motor shaft clockwise from rear
with a flat-tipped screwdriver.
13
12
11
9
10
8
6
4
7
5
3
1
2
page 3 of 4
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