ALKOTA E320 - Page 18

PUMP TROUBLESHOOTING
08-27-03 Z08-00195A
ECN-02981
TROUBLE POSSIBLE CAUSE REMEDY
9. Dirty or worn check
valves.
A. Normal wear.
B. Debris
A. Remove and replace.
B. Check for lack of water inlet screens.
10. Presence of metal
particles during oil
change.
A. Failure of internal component.
B. New pump.
A. Remove and disassemble to find
probable cause.
B. New pumps have machine fillings and
debris and should be drained and
refilled per PUMP SPECIFICATIONS.
11. Water leakage from
under head.
A. Worn packing.
B. Cracked/scored plunger.
C. Failure of plunger retainer
o-ring.
A. Install new packing.
B. Remove and replace plunger.
C. Remove and replace plunger retainer
o-ring.
12. Loud knocking
noise
in pump
A. Pulley loose on crankshaft.
B. Defective bearing.
C. Worn connecting rod.
D. Worn crankshaft.
E. Worn crosshead.
A. Check key and tighten set screw.
B. Remove and replace bearing.
C. Remove and replace connecting rod.
D. Remove and replace crankshaft.
E. Remove and replace crosshead.
13. Frequent or
premature failure of
the packing
A. Scored, damaged, or worn
plunger.
B. Overpressure to inlet manifold.
C. Abrasive material in the fluid
being pumped.
D. Excessive pressure and or
temperature of fluid being
pumped.
E. Over pressure of pumps.
F. Running pump dry.
A. Remove and replace plungers.
B. Reduce inlet pressure.
C. Install proper filtration on pump inlet
pumping.
D. Check pressures and fluid inlet
temperature; be sure they are within
specified range.
E. Reduce pressure.
F. Do not run pump without water.
14. Low Pressure A. Dirty or worn check valves.
B. Worn packing.
C. Belt slipping.
D. Improperly sized spray tip or
nozzle.
E. Inlet filter screen is clogged.
F. Pitted valves.
A. Clean/Replace check valves.
B. Remove and replace packing.
C. See BELT TENSION in MACHINE
MAINTENANCE.
D. See MACHINE SPECIFICATIONS for
specified spray tip or nozzle.
E. Clean inlet filter screen.
F. See VALVE SERVICE in PUMP
MAINTENANCE.
15. Erratic pressure:
pump runs rough
A. Dirty or worn check valves.
B. Foreign particles in valve
assemblies.
C. High inlet water temperature
A. Clean/Replace check valves.
A. Clean/Replace check valves.
C. See temperature in PUMP
SPECIFICATIONS.
16. Excessive vibration A. Dirty or worn check valves A. See "Dirty or worn check valves"
17. Scored plungers A. Abrasive material in fluid being
pumped.
A. Install proper filtration on pump inlet
plumbing
18. Pitted plungers A. Cavitation A. Decrease inlet water temperature
and/or increase inlet water pressure.
19. Cavitation A. High inlet fluid
temperatureLow inlet pressure.
A. Lower inlet fluid temperature.Raise
inlet fluid pressure.