19
H5-991-406A
Valve Wear
•. Normal.wear
•. Cavitation
•. Abrasives.in.the.fluid
•. Valve.incompatible.with.corrosives.in.the.fluid
•. Pump.running.too.fast
•. Washer.(44).missing.or.dislodged. from.position.between.
spring.and.valve
Loss of Oil
•. External.seepage
•. Rupture.of.diaphragm
•. Frozen.pump
•. Diaphragm.screw.O-ring.(0).missing.or.cracked
•. Worn.shaft.seal
•. Oil.drain.piping.or.fill.cap.loose
•. Valve.plate.and.manifold.bolts.loose
Premature Failure of Valve
Spring or Retainer
•. Cavitation
•. Foreign.object.in.the.pump
•. Pump.running.too.fast
•. Spring/retainer. material. incompatible. with. fluid. being.
pumped
•. Excessive.inlet.pressure
•. Washes.(17,.44).missing.or.dislodged.from.position
H/G-25-SD Troubleshooting