Flojet 18555 Portable RV Waste Macerator Pump Exploded Parts Diagram

The Flojet 18555 portable macerator fits a standard three-inch RV waste outlet and empties through a garden-hose discharge connection. Its pump end contains a stainless chopper, wearplates, flexible impeller and shaft seal. Use Xylem’s 17-number exploded illustration to identify the wet-end service parts and distinguish them from the motor and external fittings.

See the parts and assemblies

Each photo links to the corresponding NewRVParts product with its manufacturer part number.

18555000A Flojet 18555 portable RV waste macerator original catalog product photograph18555000A — Flojet 18555 portable RV waste maceratorPortable 12V pump for 3-inch RV waste fittings18598-2000 Flojet/Jabsco macerator service kit original catalog product photograph18598-2000 — Flojet/Jabsco macerator service kitService kit for the wet end of a compatible pump1040-0000 Jabsco shaft lip seal original catalog product photograph1040-0000 — Jabsco shaft lip sealSeparate service seal for the pump shaft

Original manufacturer illustration

Use the factory document for the numbered parts drawing and full maintenance instructions.

Open and enlarge the factory drawing

The original PDF opens separately so the parts can be enlarged on a phone.

Open the manufacturer parts diagram (PDF, page 4)

Parts and service reference

Factory no. Xylem/Flojet part no. Component
1 91085-0340 Acorn nut kit — four nuts
2 Included fibre washers Four washers at the pump mounting studs
3 17288-0010 3.23-inch stud kit — two studs
4 18599000A Pump adapter for the RV waste outlet
5 91010250A Fresh-water rinse valve
6 37056-1000 Stainless chopper plate with locknut
7 18597-1000 Large wearplate
8 18596-1000 Two pump-body gaskets
9 6303-0003-P Nitrile flexible impeller
10 12316-1002 Small wearplate
11 Included in 18598-2000 Replacement pump body
12 1040-0000 Pump shaft lip seal
13 6342-0000 Slinger
14 17288-0000 3.87-inch stud kit — two studs
15 74001-1863A Motor kit in the illustrated newer Xylem manual
16 91010253A Pump adapter O-ring kit
17 37003-1001A Metal motor-shaft cover in the newer version
Wire harness 20030415A Electrical harness and battery clamps
Hand controller 21000378A Control assembly
Wet-end repair kit 18598-2000 Replacement pump body, impeller, gaskets, small wearplate and seal

Choosing the right pump repair

Jabsco/Flojet 18598-2000 supplies the wet-end service pieces for a compatible 18555-series portable macerator. Lip-seal kit 1040-0000 is also sold separately. Neither one supplies a complete electric motor or stainless chopper. The 18550 fixed-mount pump uses different hose connections and should not be confused with the removable 18555.

Before choosing a replacement

Check the nameplate and the shaft-cover version before choosing a motor or cover: some earlier 18555 pumps have a rubber boot, while the newer Xylem illustration has a metal cover. Xylem specifies 12V DC power with a 20-amp fused circuit, limits dry running to 30 seconds and instructs that the portable pump not be permanently mounted to the waste outlet.

Compare portable macerator parts with RV holding-tank discharge equipment

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