General Description

Pump housings and gears are made of top quality bronze, shafts are made from Stainless Steel 303. Bronze bearings are designed of high performance carbon-graphite materials 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. Recommended pressure limits are 7 bar for water and non-lubricants, 10 bar for oil and lubricants. Maximum shaft speed is 1750 rpm.

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Liquids and Temperature

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 960 RPM or lower.

Liquids containing solids, abrasives, powders or paint pigments are definitely not recommended for gear pumps. If abrasives are unavoidable, use very low shaft speed.

The recommended liquid temperature range is from 00 – 600C for best pump life. If more extreme temperature conditions exist, please contact us. Freezing of water-filled pumps can cause damage and must be avoided. Oils at low temperatures are very viscous, requiring low speed and extra power.

Pump Maintenance and Repair

Oberdorfer gear pumps are essentially maintenance-free. If the pump is to be shut down for an extended period of time, it should be flushed thoroughly and filled with lubricating oil.

As a general rule, it is seldom economical to repair a worn out gear pump. However, if the gear chamber inside the pump body is still in good condition, the replacement of all interior parts by use of a repair kit may restore up to 80% of the original pump performance.

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