Broken or worn plungers, also known as pistons, will cause pressure
drop. If it's a worn plunger, pressure drop will occur over a period of
time. If it's a sudden loss of pressure then one or more of the pistons
could be cracked.
I say "could" because the pressure loss
could be caused by worn seals, or both pistons and seals. Refer to
water leakage in the index.
Generally speaking, if you have a broken or cracked plunger you
will also have damaged seals. To inspect seals you will be
exposing the pistons.
ALWAYS check piston condition VERY closely.
Minor cracks may not be visible but will still allow water to pass when under
pressure. Best way is to inspect is under a magnifying glass.
Also, run your finger nail or a sharp edge, such as a razor blade,
across the plunger to feel for a minor crack.
see a range of replacement plungers click here.
To prevent plunger
damage make sure you have a clean
water supply and do not let your pump overheat. The cold incoming
water cools the pump as it goes through the system. If this flow is
restricted the pump will cavitate
and overheat. Most plungers are made from ceramic material, which is
very hard wearing, but brittle. When over-heated this ceramic material will
a discussion on pumps click here.
Tell-tale signs of worn or broken pistons is water in your
crankcase oil. Check the oil for a milky color. See
the index for additional discussion points
see a range of replacement pumps click here.
SOME OF THESE OPERATIONS CAN BE
EXTREMELY DANGEROUS. IF YOU DO NOT HAVE SUFFICIENT TRAINING IN THESE PROCEDURES, WE RECOMMEND YOU
SEEK ASSISTANCE FROM A