Bronze Pedestal Gear Pump - N4000

Flexible Drive Options
Choose the drive method that best suits your setup, whether it's a direct drive with flexible coupling or a pulley drive. Proper alignment is crucial for flexible couplings, and when using a pulley, avoid over-tightening the belt. For higher pressures and larger pumps, an external ball bearing support is recommended—our team is here to help with these details.

Handling a Range of Liquids and High Temperatures
The N4000 pump excels when handling clean liquids with some lubrication. Keep in mind that fine abrasives can accelerate wear, so it's best to pump liquids compatible with bronze and stainless steel. Our pumps are designed for a wide temperature range, from -40°F to 400°F (-40°C to 204°C), though it's important to avoid temperature extremes for optimal service life.

Effective Suction Lift Capabilities
Thanks to its close tolerances and positive displacement action, this rotary gear pump can lift water on the suction side up to 20 feet (6.1 meters). Although self-priming, we recommend using a foot valve. For the initial dry start, pre-wetting the gears with the liquid is advised for the best performance.

Best Practices for Longevity
For high pressures over 100 PSI (6.9 bar), the N4000 is suited for fluids with lubricity, such as oils and polymers. Fluids without lubricity, like water or solvents, may reduce service life.

Simplified Parts and Maintenance
Please note that the pump's bypass is not for metering or flow control—it serves as a pressure relief. To adjust the by-pass valve set point, simply turn the valve adjusting screw clockwise.

The N4000 Bronze Gear Pump is designed with your needs in mind, offering a robust, efficient, and adaptable pumping solution. Choose the N4000 for smooth and quiet operation, backed by the durability and quality you can trust.

DRIVE

Either direct drive with flexible coupling or pulley drive can be used. Make sure both flexible coupling halves are properly aligned. When using a pulley, do not over tighten the belt. Also, to absorb belt side thrust at higher pressures and larger size pumps, an external ball bearing support is recommended - consult factory.

LIQUIDS & TEMPERATURES

Service life will be increased substantially if the liquid pumped is clean and has some degree of lubricity. These positive displacement pumps have tight tolerances. Fine abrasives like sand, silt, or powders in suspension will accelerate pump wear and reduce throughput. Liquids compatible with bronze and stainless steel can be pumped providing proper seal has been specified (see chemical compatibility or check factory). No carbon bearings used. When possible, flush the pump after each usage. Temperature extremes are detrimental to service life and should be avoided. Basic metals of construction allow a temperature range of -40°F to 400°F. Some lip seal elastomers have a limit of 212°F. (see engineering data or check factory). Allowing a liquid to freeze in the pump can cause damage.

SUCTION LIFT

Close tolerances and the positive pumping action make the rotary gear pump capable of lifting water on the suction side as high as 20 feet. Though gear pumps are self priming, a foot valve is recommended. If possible, wet the gears with liquid to be pumped for the first dry start. Liquid retained in the system and gear chambers serves to “wet” the pump on subsequent starts.

*For pressures over 100 psi, the above selections are suitable for pumping fluids with lubricity (e.q. oils, polymers). Service life will decrease for fluids without lubricity (e.q. water, solvents).

EXPLODED VIEW & PARTS LIST

The pump by-pass is not intended to be a metering or flow control device. Its main purpose is to function as a pressure relief when the desired set point is exceeded, overheating can occur within 5 -10 minutes if the discharge line is completely shut off for extended periods. Reversing rotation reverses the “IN” and “OUT” ports and the location of the by-pass ports have to be reversed. The by-pass valve is factory set at 50 p.s.i. To increase the set point, turn the bypass valve adjusting screw in a clockwise direction.