JD VIP Buyers Club
JD on Facebook
JamestownTV
JD Points Program
Request A Free Catalog

Jabsco Trouble Shooting with Impeller Replacements


Trouble Shooting Guide

Trouble Shooting 1

Symptoms:
  • End faces hard and either polished or cracked, like carbon.

  • Some or all blades completely missing.
  • Cause:
  • Dry running, lack of water in pump.

  • Temporary suction blockage.

  • Leaking suction plumbing.
  • Remedy:
  • Do not run pump for more than 20 seconds without liquid.

  • Install a liquid sensor/temperature alarm.

  • Check suction plumbing, strainers, and thru-hull fittings for blockages and leakage.

  • Arrange discharge plumbing to trap liquid in the pump.
  • Back to the top

    Trouble Shooting 2

    Symptoms:
  • Pieces missing from the middle of blade tips.
  • Blade edges are hollowed out.

  • Pitting is evident on cam and the inside of pump ports, and on ends of impeller.
  • Cause:
  • Cavitation, i.e. too much vacuum on inlet is causing water to boil inside pump.
  • Remedy:
  • Reduce pump speed.

  • Increase inlet plumbing diameter.

  • Reduce inlet plumbing length and remove unnecessary restrictions.

  • Reduce cam thickness.
  • Back to the top

    Trouble Shooting 3

    Symptoms:
  • Worn blade tips, cam imprint on edges.

  • Worn end faces.

  • Worn impeller drive and shaft wear.
  • Cause:
  • Abrasive wear from fluid in pump.

  • Heat exchanger/cooler blockage.

  • High discharge pressure.
  • Remedy:
  • Check discharge plumbing for partial blockages.

  • Increase discharge pipe diameter.
  • Back to the top

    Trouble Shooting 4

    Symptoms:
  • Impeller appears to have swollen.

  • Blades appear wider than impeller hub.

  • Rubber may feel sticky.
  • Cause:
  • Chemical attack, more common with oily bilge water or diesel transfer.
  • Remedy:
  • Ensure impeller is rinsed after use.

  • Remove impeller when not in use.

  • Remove impeller for long term storage.
  • Back to the top

    Trouble Shooting 5

    Symptoms:
  • Blades have some or severe permanent set.
  • Cause:
  • Normal use of impeller.

  • Long term storage in pump.

  • Normal end of impeller life.
  • Remedy:
  • Refit impeller to rotate in opposite direction.

  • Remove impeller for long term storage.

  • Replace impeller.
  • Back to the top

    Trouble Shooting 6

    Symptoms:
  • Blades cracked about half way up the length.

  • Some of blades missing.

  • Reduced flow.
  • Cause:
  • Normal end of impeller life.

  • High discharge pressure.
  • Remedy:
  • Replace impeller, check for impeller pieces in discharge plumbing.

  • Reduce outlet restrictions or increase outlet plumbing diameter.
  • Back to the top




    For more, see Impeller Replacement- The Basics

    JD on Facebook Live Tech Support JD Customer Photo Gallery Free Catalog