Johnson Pump 750 GPH Bilge Pump Replacement Cartridge JP-28572 for Model 32702 — 12V Direct Replace

Johnson Pump 28572 is a direct-replacement 12V cartridge motor designed to restore the performance of 750 GPH bilge pumps (model 32702) quickly and securely.

If your 750 GPH Johnson Pump has lost suction or is noisy, installing the JP-28572 replacement cartridge brings the pump back to factory-style operation without swapping the entire unit. This cartridge is manufactured for compatibility with Johnson Pump 750 GPH cartridge pumps and ships in a compact package (3.0" H x 7.5" L x 6.0" W), weighing about 0.75 pounds. It’s a practical repair option for boat owners, marinas, and service technicians who prefer replacing the internal motor assembly rather than the full pump.

How do I know this cartridge fits my 750 GPH Johnson Pump?

Confirm fit by matching the part number and pump model: this replacement is MFG# JP-28572 intended for 750 GPH cartridge pumps, commonly used with Johnson model 32702. Check your pump’s data plate or owner’s manual for the model number before ordering to ensure compatibility.

• Designed for 750 GPH cartridge-style bilge pumps
• Manufacturer part number: JP-28572
• Commonly used with Johnson Pump model 32702
• Confirm your pump’s model and dimensions prior to purchase

What electrical and physical specs should I expect?

This cartridge is a 12V replacement motor sized to fit the cartridge housing of compatible 750 GPH pumps. It’s lightweight for easy handling and ships in a compact box suitable for storage or field service kits.

• Voltage: 12 volts DC
• Estimated weight: 0.75 pounds for the packaged cartridge
• Package dimensions: 3.0" H x 7.5" L x 6.0" W
• Manufactured origin: China

What should I consider during installation and maintenance?

Replacing the cartridge generally involves removing the pump head, swapping the old motor cartridge for the new JP-28572, and reassembling with proper seals. Always disconnect power before beginning work and inspect seals and impeller for wear—replacing worn gaskets at the same time improves long-term performance.

• Disconnect battery or power source before service
• Inspect impeller and seals; replace if worn
• Ensure proper seating of the cartridge to prevent leaks
• Test pump operation after reassembly at low speed before full use

Will replacing the cartridge restore my pump’s original flow?

Yes, installing a correct, undamaged JP-28572 cartridge typically restores the pump to near-original flow and noise levels provided the impeller and housing are in good condition. If the pump body, inlet/outlet fittings, or impeller are severely corroded or damaged, those components may also need service for full restoration.

• Restores motor-driven performance when matched correctly
• Best results when impeller and housing are in good condition
• Replacing seals and gaskets reduces risk of leaks
• Follow manufacturer torque and assembly guidance

Who is this for: boat owners, dockside technicians, and marine service shops seeking an OEM-style replacement motor cartridge for Johnson Pump 750 GPH cartridge pumps. If you want a targeted repair that saves the cost and disposal of a full pump replacement, and you have a compatible Johnson Pump model (such as 32702), the JP-28572 cartridge provides a straightforward, lightweight solution for restoring bilge pump operation.