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Maintenance on the Bison Model 1900 Shallow Well Hand Pump

The Bison Pumps come with a Lifetime Warranty on the stainless-steel parts and construction. However, you may still need to perform maintenance on your pump. Maintenance is rarely required beyond winterization, but some situations can cause excessive wear or damage to consumable pump components.

Cup Seals and O-Ring:

If used normally, these seals will last many years. The wear to these seals is directly related to the amount of pumping and the condition of the water. If your water has contaminants they could act as an abrasive and cause wear to the packing gland, piston cup seals and O-rings.


f you’re in a situation of high use AND low-quality water, the sealing components may need to be replaced eventually. For this, you can call and order the Bison Pumps Seal Maintenance Kit ( The kit has everything you need to repair your pump.

The Bison Pumps Seal Maintenance Kit includes:

  • 1x Gland Nut
  • 1 x Plastic Packing Gland Washer
  • 1 x ½” x 1” Packing Gland Cup Seal
  • 1 x Top Plate O-ring
  • 1 x Bottom Bushing
  • 2 x Piston Cup Seal
  • 1 x Spring Pin
  • 1 x Seal Pick Tool

Bison Tip: While you’re got your pump disconnected, take advantage of this time and clean the inside components of the pump. It’s best to first remove the components that will be replaced and THEN clean the inside of the pump. Finally, install the new components. While it’s out, inspect the Check Valve in the bottom of the Piston and Check Valve Housing. Make sure it’s clear of any debris that might prevent the Check Valve from closing properly. Given proper care, the Check Valve should last a lifetime. However, if the Check Valve is damaged by large debris, call Bison Pumps for a replacement. 1-800-339-2601.

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.The owners of private household water wells in areas affected by hurricanes, and other flooding situations, should act to address possible threats to their drinking water quality , according to the National Ground Water Association.

If a well has been flooded:

  • Do not drink the water or wash with it, but use an alternative supply such as bottled water
  • Stay away from the well pump while it’s flooded to avoid electrical shock
  • Get a qualified water well contractor or pump installer to —
    • Clean and turn on the pump
    • Flush the well
    • Disinfect the well
    • Perform any other necessary maintenance
  • Check with the local emergency management agency about any guidance relating to local conditions or specific contamination threats due to area flooding.

Bacterial contamination is to be expected in a flooded well, so disinfection of the well system after it has been pumped out and cleaned will be necessary, said Cliff Treyens, NGWA director of general public outreach. NGWA recommends that water well system professionals be used to assess and service the well.

Well owners can search for NGWA-member or NGWA-certified professionals at under “Finding a Contractor.”

Other resources for well owners in flood situations can be found in the “Water Quality ” section of

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