Jabsco 4-Blade Chopper Kit, For 18590 Series Macerator Pumps, With Lock Nut

Overview

The Jabsco 37056-2000 is a 4-blade chopper plate kit with lock nut for Jabsco macerator pump service. It is the replacement cutter assembly used in Jabsco 18590-series macerator pumps and in the 22130-2721 assembly. This is a service part, not a complete pump.

The cutter is a stainless steel 4-blade piece that sits on the motor shaft inside the macerator housing. In the matching 18590-series pump, this cutter layout is used to reduce particle size to 1/8 in. (3 mm) maximum, so it is the part to inspect when the pump still powers on but is no longer chopping waste cleanly.

On boats using these pumps for holding tank discharge, fish box drainage, or livewell evacuation, replacing a worn chopper can be a more targeted repair than changing the whole unit. Matching the part number to your pump service parts layout is the safest way to confirm fit, especially on older installations or pumps that have already been rebuilt once.

Key features

• Replacement 4-blade chopper plate with lock nut for Jabsco macerator pump service
• Fits Jabsco 18590-series macerator pumps
• Also specified for the Jabsco 22130-2721 assembly
• Stainless steel cutter construction
• Service part only, not a complete pump and not a full rebuild kit

Compatibility and fit

This part fits the cutting section of the macerator, not the motor, impeller, gaskets, seal, or housing. It suits repairs where the chopper itself is bent, rounded off, seized, or missing. If the pump also needs wearplates, seals, an impeller, or other hard parts, those items need to be ordered separately.

Fit matters most at the pump model level. This part is tied to the Jabsco 18590-series and the 22130-2721 assembly, so it is a good match when those model numbers or this exact replacement part number are already on the pump documentation or service history for the boat.

Installation and setup

Replacing the chopper means opening the macerator housing, removing the old lock nut and cutter from the shaft, and reinstalling the new chopper with the drive tab aligned on the flat of the motor shaft before tightening the lock nut. Disconnect power before service and isolate the plumbing first, because this is still work on a waste handling system.

This repair is a sensible choice for owners and service yards maintaining Jabsco macerator systems on cruising boats, sportfishing boats, and similar installations where the rest of the pump is still serviceable and the cutter is the failed part.

What’s included

• 4-blade chopper plate
• Lock nut

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