My Cart

Bronze Rotary Gear Pump w/ motor

1-1/2HP 115/230v 1"
Model Number
Oberdorfer N990J-T47 Bronze Rotary Gear Pump w/ motor

Oberdorfer N990J-T47

Oberdorfer Close coupled bronze rotary gear pumps.

  • Bronze Construction with SS shaft
  • Helical gears for quiet operation
  • Self-lubricating carbon bearings
  • O-ring seal for max. leak protection
  • The pump drive shaft is connected to the motor shaft by a flexible coupling 
    Pump housings and gears are made of top quality bronze,
    shafts are stainless steel 303. Bearings are made of high performance
    carbon-graphite material selected for wear resistance and
    long service life.
    Gear pumps are positive displacement pumps. Each shaft revolution
    displaces a definite amount of liquid relatively unaffected by
    the back pressure in the discharge line. Shaft speed and flow are
    directly proportional.
    Close coupled pumps are mounted directly to the electric
    motor by means of a suitable adapter bracket. The pump drive shaft
    is connected to the motor shaft by a flexible coupling.
    These pumps are suitable for all liquids that are compatible
    with bronze. Most common liquids are water, oil, and mild chemicals
    in the pH-range of 4 to 11. Viscous liquids require reduced shaft
    speeds of 1150 RPM or lower. Consult factory.
    Liquids containing solids, abrasives, powders or paint pigments
    are definitely not recommended for gear pumps. If abrasives
    are unavoidable, use a very low shaft speed. The recommended liquid
    temperature range is 32oF to 140oF for longest pump life. If more
    extreme temperature conditions exist, our factory should be consulted.
    Freezing of water-filled pumps can cause damage and must be
    avoided. Oils at low temperatures are very viscous requiring a lower
    speed or extra power.
    As a general rule, the suction lift should be kept at an absolute minimum
    by placing the pump as close to the liquid source as possible. A gear
    pump in new condition can lift 20 feet of water in the suction line. A foot valve
    (preferably with built-in strainer) is recommended at the beginning of the
    suction line. For a first start-up, the pump should be primed to avoid dry running.
    Minimum size of the suction pipe is the size of the pump inlet port. For
    longer suction lines (over 3 feet), or for viscous liquids, the pipe size should
    be at least one size or two sizes larger than the pump inlet port.
    The relief valve is not intended to be a metering or flow control device.
    Its main purpose is to function as a discharge pressure relief when the spring
    tension is exceeded by the discharge pressure. Overheating can occur within
    5-10 minutes if the discharge line is completely shut off for extended
    Unless otherwise specified, the pump motor unit is supplied by the
    factory for shaft rotation clockwise from shaf t end. Reversing the motor rotation
    will reverse the “in” and “out” ports and also requires changing the relief
    valve location. The relief valve is always on the discharge side in this pump
    series. The factory pressure setting is 50 PSIG. To increase pressure, turn
    the relief valve adjusting screw in a clockwise direction.
    To reverse single phase motors, find instructions on the inside of the
    junction box cover or on the name plate of the motor.
    Three phase motors are not wired for any particular rotation. They can
    be reversed by interchanging any two (2) wires of the three (3) wire leads.

More Information
Model Number N990J-T47
part number N990J-T47
Series N990 Close Coupled Bronze Rotary Gear Pumps
Max Flow (GPM.) 23
Max Flow GPH 1380
Horse Power (HP) 1 1/2
Horsepower (IE .5, 1, 1.5, 20) 1.5000
Inlet Connection Type FNPT
inlet size 1"
Inlet (In.) 1
Outlet Connection Type FNPT
Outlet (In.) 1
Wetted Materials 304SS, Bronze
Voltage (V) 115/230
Voltage (Range) 110-120/220-240
Phase (Ø) Single (1)
Motor Frequency 60
Motor TEFC
Speed (RPM.) 1725
Motor Frame 143/5TC
Self Priming Yes
Suction Lift (FT.) 20
Max Operating Temperature (F) 225
Viscosity Glycerine 880.00 cp 5000.00 ssu
Shaft 304SS
Mechanical Seal BUNA LIP SEAL
Mechanical Seal Type Single
Coupling Y
Other Clockwise rotation from pump end.
Pump Bearing Carbon/graphite
Drain No
Country of Manufacture United States
Weight (Lbs) 48.000000
Warranty (YRS.) 1

Supporting Docs

Supporting Docs
(Size: 134.85 KB) Extension: pdf