Jabsco 11870 Series Electro-Magnetic Clutch Pump, 1-1/4 in NPT, 62 GPM, Bronze

Overview

The Jabsco 11870-Series is a self-priming flexible impeller pump with an electro-magnetic clutch for belt-driven marine pumping duties. It uses 1-1/4 inch NPT internal ports and is built around a bronze body, nitrile impeller, stainless steel shaft, carbon-ceramic face-type seal, and shielded ball bearings.

This series is commonly used for bilge pumping, washdowns, bait tank circulation, and utility dockside water transfer where the pump is driven mechanically but engaged electrically. At 1750 rpm, the 11870-Series can move up to 62 GPM at 10 ft of head, and it can self-prime from dry up to 7.8 ft when the suction side is airtight.

Key features

• Self-priming flexible impeller pump for bilge, washdown, bait tank circulation, and dockside utility water transfer.
• Electro-magnetic clutch allows remote on-off engagement while the drive source is running, using the correct control switch and wiring for the installation.
• 1-1/4 inch NPT internal ports fit larger plumbing runs used on higher-flow onboard water movement.
• Bronze body with a stainless steel shaft, nitrile impeller, carbon-ceramic face-type seal, and shielded ball bearings.
• Capacity reaches 62 GPM at 1750 rpm at 10 ft of head, with capacity changing as head pressure increases.
• Available in 12 VDC, 24 VDC, and 32 VDC clutch versions with pulley choices for 2-A or 1-B belt setups.

Variants

The range is offered in five configurations so the clutch voltage and belt groove can match the boat's DC system and existing drive arrangement.

The pump construction, 1-1/4 inch NPT internal port size, nitrile impeller, carbon-ceramic seal, and general 11870-Series layout are consistent across these variants. The clutch voltage and belt groove are the configuration points that change.

• 11870-0005: 12 VDC clutch with 2-A belt groove. This version matches 12 VDC control wiring and a pulley setup using two A-size belts.
• 11870-0045: 12 VDC clutch with 1-B belt groove. This version matches 12 VDC control wiring and a pulley setup using one B-size belt.
• 11870-0006: 24 VDC clutch with 2-A belt groove. This version suits a 24 VDC clutch circuit and a drive arrangement using two A-size belts.
• 11870-0046: 24 VDC clutch with 1-B belt groove. This version suits a 24 VDC clutch circuit and a drive arrangement using one B-size belt.
• 11870-0007: 32 VDC clutch with 2-A belt groove. This version supports a 32 VDC clutch circuit and a pulley setup using two A-size belts.

Electrical and drive setup

Select the clutch voltage to match the onboard control circuit: 12 VDC versions draw 4 A and use a 7 A fuse, 24 VDC versions draw 2 A and use a 4 A fuse, and the 32 VDC version draws 1.5 A and uses a 2 A fuse. The fuse should be placed in the positive lead close to the power source.

The belt groove must match the engine or auxiliary drive pulley arrangement. The 2-A groove versions use two A-size belts, while the 1-B groove versions use one B-size belt. Belt guards should be fitted around exposed pulleys and belts in service.

Installation and use

The pump may be mounted in any position, and the intake and discharge sides depend on shaft rotation. Before final plumbing, turn the pump in the intended shaft direction with the clutch energized so the port orientation and hose routing are confirmed.

Flexible impeller pumps need water flow for cooling and lubrication. This pump should not be run dry for more than 30 seconds, and an airtight suction line is important for priming. It is not for gasoline, petrol, petroleum products, or liquids with a flash point below 37 degrees C.

Marine use on board

For a workboat, cruising boat, or fishing boat with belt drive available, this series makes sense where high-flow water movement is needed but continuous pump operation is not. The clutch lets the pump stay on the drive system and engage only when the bilge, washdown, bait tank, or transfer task calls for it.

Maintenance and care

The end cover, impeller, gasket, and seal are serviceable items, and keeping the correct Jabsco service kit on board can reduce downtime during longer trips. Check the impeller after any dry-run event and keep belt tension within the normal service range for the vessel's drive setup.