These recommendations will ensure consistent, high lifts.
by Lindsey Thorp, Thompson Pump
July 15, 2014
  • Check all fluid levels.
  • Check battery and cables.
  • Check belts and hoses.
  • Ensure that all guards and covers are in place.
  • Make sure needle valve to the hydraulic circuit is de-energized (open).
  • Make sure the throttle control is set to the idle position.

Once the hydraulic power unit and submersible pump are in place, all the hoses and fittings are connected and secured, and the prestart checks have been performed, the pump may be started. Adjust the engine speed, but operate the engine only within the manufacturer’s minimum and maximum speed range.

While the pump set is operating, continual monitoring of the sump is important. No “set it and forget it” mind-set can be used in this application—adjust the pump head periodically to ensure that the head is adequately submersed for optimal flow.

Best Practices

Operators should:

  • Inspect hoses for kinks, loops and damage before operating.
  • Follow Environmental Protection Agency or other government regulations regarding environmental hazards.
  • When operating in temperatures below 40 degrees Fahrenheit, ensure that you are using the proper grade hydraulic oil, engine oil and other fluids rated for cold temperature.
  • Flush the pump head after use to remove sand settlement or previously suspended media.
  • When storing the hydraulic system, disconnect all hoses from both the power unit and the submersible pump head to avoid temperature-related pressure spikes and possible damage.
  • Follow the maintenance schedule as specified in the pump maintenance manual. For a listing of daily and routine preventive maintenance checks, visit this article on

Operators should not:

  • Disconnect any hydraulic connections while pressurized or during operation.
  • Operate the unit if the system has a hydraulic leak.
  • Mix petroleum-based oil with biodegradable fluids.
  • Stand in the path of hydraulic hoses while in operation. A severed hose can move like a bull whip under pressure, causing severe injury.
  • Operate the unit at an excessive inclination angle.