Table 4-1. Troubleshooting - continuedPROBLEMPOSSIBLE CAUSEREMEDYLow pressure5. Relief valve stuck,Clean, and adjust relief valve, check forpartially plugged orworn and dirty valve seats.improperly adjusted,valve seat worn.6. Inlet suction strainerClean. Use adequate size. Check moreclogged or improperfrequently.size.7. Worn piston assembly.Install proper filter. Suction at inletAbrasives in pumpedmanifold must be limited to liftingfluid or severe cavi-less than 20 feet of water or -8.5 PSItation. Inadequatevacuum.water supply.8. Fouled or dirty inletClean inlet and discharge valve assem-or discharge valves.blies.9. Worn inlet or dis-Replace worn valves, valve seats and/orcharge valves ordischarge hose.leaky discharge hose.Pump runs extremely1. Restricted inlet or airProper size inlet plumbing; check forrough, pressure veryentering the inletair tight seal.low.plumbing.2. Inlet restrictions and/Replace worn cup or cups, clean outor air leaks. Damagedforeign material, replace worn valves.cup or stuck inlet ordischarge valve.3. Worn inlet manifoldReplace worn seals.seals.4. Worn inlet seals allowInstall new inlet manifold seals.pump to draw air.Cylinder O-rings1. Pressures in excess ofCheck for plugged nozzle, closed valvesblown next to dis-rated PSI.or improperly adjusted by pass valve.charge manifold2. Warped manifold.Replace manifold.Leakage at theLoose cylinders. CylinderRemove spacer shims on manifold studs.cylinder O-ringsmotion caused by impro-Do not remove too many shims or theat the dischargeper shimming of the dis-ears of the manifold will be bowed whenmanifold and black,charge manifold.the manifold is retightened, causingpowdery substancelooseness in the center cylinder.in the area of theO-rings4-7
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