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Bronze Pedestal Gear Pump W Relief Valve

1/2" w/ relief valve
Model Number
Oberdorfer - N4000LR

Oberdorfer N4000LRS3

Bronze Pedestal Gear Pump With Relief Valve. Bronze Pedestal Gear pump. Often used as a oil pump on large ships to pre-lube the bearings, Chillers (Dynaflux) often used with welders. See performance chart for motor speed VS HP VS performance.

  • 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.
  • Maximum shaft speed is 1750 rpm.
  • Recommended pressure limits are 100 psi for water and non-lubricants, 150 psi for oil and lubricants.
  • A relief valve is a 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. However, built-in relief valves are only good for intermittent service. If used continuously, the pump will over heat. A built-in relief valve is strictly a safety device against over pressure. It will not work successfully as a pressure or flow control device. 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.
  • 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

Repair kit is PN 11387

More Information
Model Number N4000LRS3
part number N4000LRS3
Series N9000 Pedestal Bronze Rotary Gear Pumps
Max Flow (GPM.) 10
Max Flow GPH 600
TDH Maximum (Ft) 346
TDH Maximum (PSI) 149
Inlet Connection Type FNPT
Inlet (In.) 0.5
Outlet Connection Type FNPT
Outlet (In.) 0.5
Wetted Materials 304SS, Bronze
Elastomers / O-ring FKM
Speed (RPM.) 1725
Self Priming Yes
Max Operating Temperature (F) 350
Viscosity Glycerine 880.00 cp 5000.00 ssu
Shaft 304SS
Mechanical Seal Buna Lip Seal
Mechanical Seal Type Single
Coupling Y
Other Shaft Size: 5/8". Buna Lip Seal. Factory setting on by-pass is 50psi. Pump is reversible when initially setup.
Pump Bearing Carbon
Drain No
Port Rotation Yes
Country of Manufacture United States
Weight (Lbs) 12.000000
Warranty (YRS.) 1