On this page you will find answers to common questions that are asked in regards to Comet diaphragm and high pressure plunger pumps. If you can’t find your question below, give us a call at 800-864-1649 or send an email via our Contact page.

Do I Need Oil To Run A Comet Pump? + -

Yes you will need to make sure your crankcase is filled with Comet pump oil before use. Running this pump without oil will cause damage to your pump and would void your warranty.

How Often Should I Change Pump Oil? + -

Change the pump oil after the initial 50 hours of operation. Change pump oil every 500 hours after the initial oil change.

How Do I Check The Oil Level? + -

The oil level of the Comet pump can be checked by removing the oil cap and inspecting the dip stick. The correct level should fall between the “Min” and “Max” lines on the dip stick.

Can I Run The Pump Dry? + -

Do not run the pump dry. Running the pump dry will cause premature wear on the seals, packing and plungers. Can also cause damage that is beyond repair.

How Should I Store A Pump If Not In-Use? + -

If a Comet pump is to be stored, a risk of freezing might take place. To prevent a Comet pump from freezing, run anti-freeze through the pump. Empty any extra liquid inside the pump by running the pump without water for no more than 20 seconds.

What Is DURAphragm™ Technology? + -

DURAphragm™ Technology extends the life of the diaphragms in a Comet diaphragm pump by shielding them from direct contact with the chemical inlet. This spreads the inlet vacuum across the entire surface of the diaphragm instead of focusing it on the one small area where most failures occur.

For a more in-depth step by step process, watch our video on DURAphragm™ Technology.

What Kind of Warranty Is On a Comet Diaphragm Pump? + -

All Comet diaphragm pumps are backed by a one year warranty on manufacturing defects in the pump. If you are in need of warranty parts, contact our Comet staff at 800-864-1649.

What Kind of Warranty Is On a Comet Plunger Pump? + -

There are several warranty time frames across the available Comet plunger pumps.

  • BW/EWD/LW/AW/ZW/FW2/RW/SW/TW – Five year warranty
  • AXD – Two year warranty
  • BXD, VRX – One year warranty
What Voids A Warranty On A Comet Pump? + -

A warranty can be voided for a Comet diaphragm or high pressure plunger pump in the following ways:

  • Over-excessive speeds, pressures, temperatures or handling fluids not compatible.
  • Freight or freezing damage.
  • Damaged caused by parts or accessories not obtained or approved by Comet.
  • Damage or miss-use and/or misapplication.
  • Normal wear of moving parts or components affected by moving parts.
  • Any pump that has been repaired or altered to affect the performance or reliability of the pump.