How to Install a Grinder Pump


A grinder pump --- a device for waste management --- holds accumulated bio-waste flowing from water-based household appliances, such as toilets, bathtubs, washing machines and sinks. The pump has a mounted sensor bell that turns on the pump once the bio-waste reaches a certain level. It then grinds the bio-waste into a slurry and transports it to the central sewage system. A grinder pump's central location usually lies in the basement. Installing a grinder pump in the yard requires deep trench digging and pump installation below the frost line. Do not attempt to install a grinder pump without adequate experience in plumbing and mechanical services.

Things You'll Need

  • Grinder-pump assembly
  • Safety goggles
  • Helmet
  • Gloves
  • Steel-toed shoes
  • Vacuum pump
  • Adjustable wrench
  • Rope
  • Pump hoist
  • Tape measure
  • Teflon tape
  • Gasket tape
  • O-ring grease
  • Megger measurement instrument
  • Inspect the shipping package for damages incurred during shipment. Be careful when opening the package and removing its contents. Check the package for spare parts. Compare the invoice to the order form to see if the correct grinder-pump model was shipped. Report discrepancies to the freight carrier and manufacturer.

  • Read the grinder-pump installation manual. Research the National Electrical Code and local building codes for placement specifications. Choose an installation site with a sufficient depth that lies below the frost line. Wear safety equipment, such as safety goggles, helmet, gloves and steel-toed shoes to prevent injury.

  • Turn off the appropriate 30-amp circuit breaker to cut the power supply. Locate the riser component. Dislodge and remove the basin lid from the old pump. Attach vacuum lines to the basin. Pump out and dispose of sewage in accordance with local, state and national building codes.

  • Remove the disconnect plug inside the basin. Loosen and remove the basin's locking bolts with an adjustable wrench. Twist the valve in a clockwise fashion to close it.

  • Tie rope to the basin's hooks. Attach and slowly lift the old pump out of the basin with a pump hoist. Use a tape measure to record the distance between the cover and the discharge elbow base.

  • Wrap Teflon tape to the discharge pipe's threads. Align and install mounting bolts into the guide posts of the stainless-steel elbow and discharge pipe. Torque the fittings with an adjustable wrench.

  • Pull out the release pin on the elbow. Adjust the elbow center nut to about 12 1/2 inches. Replace the release pin to keep the center nut from loosening. Position the float switches away from obstructions. Activate the float switches to test functionality.

  • Torque the fittings until they're firmly tight. Wrap gasket tape around the cover's perimeter. Poke holes through the gasket tape with an awl to secure access to the cover bolts. Apply O-ring grease to the discharge elbow's O-rings before installing the elbow into the receiver.

  • Tie rope to the hooks on the grinder assembly and attach it to the pump hoist. Lower the grinder assembly into the basin. Align the cover tabs and pump slots. Insert the discharge elbow to the receiver's ball valve. Rest the pump on the tank flange.

  • Open the valve to encompass the elbow with the handle. Thread and insert six mounting bolts through the cover's guide posts. Torque until fully tightened.

  • Retighten the field-made and factory-made connections with an adjustable wrench.

    Remove all obstructions in the path of the pump cutter. Test the control panel's electrical insulation with a Megger measurement instrument.

  • Turn on the circuit breaker to restore power. Fill the basin with water. Turn on the grinder pump to test its operation. Refer to the troubleshooting section of your instruction manual if problems arise. Replace the basin lid and nameplate.


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