Piston Kit Failures

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If all piston shoes thickness are not within prescribed limits, the out-of-tolerance shoes may experience "lifting". Shoe "lifting" may also be caused by pump cavitation. If not properly diagnosed the shoe may come completely off the piston and cause catastrophic damage.
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Piston Head Contamination: Loose shoes on the piston head are a result of severe scoring and pitting from contamination.
Rolling: Shoe lift and cavitation produce a "rolling" effect that rounds off the shoe edge. Rolling also occurs as a result of scoring on the shoe surface.
Piston Damage: Contamination & seizing on the piston diameter.