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Oberdorfer N991-F41 N991 Oberdorfer PUMP  MTR. Oberdorfer N991-F41 N991 Oberdorfer PUMP  MTR. Ober_N991-exploded.gif
Oberdorfer N991-F41 N991 Oberdorfer PUMP  MTR.

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Manufacturer: Oberdorfer
Series (31 Models):

N Oberdorfer Gear Pumps Bronze

Product Name:

N991 Oberdorfer PUMP & MTR.

Model Number:


Gallons Per Hour: 120 (2 GPM)
Voltage: 115
Horsepower: 1/2

Quick Overview

1/2HP 115


Glycol circulation Pump by Oberdorfer is just one of hundreds of applications. Pump housings and gears are made of top quality bronze; shafts are from stainless steel 303. Bearings are designed of high performance carbon-graphite material selected for wear resistance and long service life.

Oberdorfer Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the backpressure in the discharge line. Shaft speed and flow are directly proportional. Recommended pressure limits are 100 psi for water and non-lubricants, 150 psi for oil and lubricants. Maximum shaft speed is 1750 rpm.

A relief valve is necessary in the system if the discharge line contains any throttling devices, such as a shut-off valve, a spray nozzle or other restrictive device. This will return the liquid to the suction side or to the tank. The relief valve is also available as part of the pump itself (R-model pumps). Often used for diesel fuel transfer. For this purpose a separate relief valve in the pressure line must be used.

Service life will be increase substantially if the liquid pumped is clean and has a lubricity value. These pumps have extremely close tolerances.

Additional Information

Model Number OBN991-F41
part number N991-F41
Series N Oberdorfer Gear Pumps Bronze
Warranty (YRS.) 1
Max Flow (GPM.) 2
Max Flow GPH 120
TDH Maximum (Ft) 347
TDH Maximum (PSI) 150
Horsepower 0.5
Horse Power (HP) 1/2
Inlet Connection Type FNPT
Inlet (In.) 0.25
inlet size Less than 1"
Outlet Connection Type FNPT
Outlet (In.) 0.25
Wetted Materials 304SS, Bronze
Elastomers / O-ring Buna-Nitrile
Voltage (V) 115
Voltage (Range) 110-120
Phase (Ø) Single(1)
Motor Frequency 60
Motor ODP
Speed (RPM.) 1725
Self Priming Yes
Suction Lift (FT.) 20
Max Operating Temperature (F) 140
Viscosity Glycerine 880.00 cp 5000.00 ssu
Shaft 304SS
Mechanical Seal LIP SEAL
Mechanical Seal Type Single
Coupling Y
Applications Constant Pressure, Coolant, Flooded Suction, Fuel Oil, High Pressure, Hydrostatic Test, Self-Priming
Pump Bearing Carbon
Port Rotation Yes
Country of Manufacture United States
Weight (Lbs) 18
Time to Ship (DAYS) 2-3 days

Supporting Docs

N991 Oberdorfer PUMP & MTR.N991 Oberdorfer PUMP & MTR. Size: (41.15 KB) Extension: jpg
N991 Oberdorfer PUMP & MTR.N991 Oberdorfer PUMP & MTR. Size: (66.63 KB) Extension: gif
California prop 65