Nordson EP2, Manual

Page: 30 / 40

26 EP2 Pump System
© 2021 Nordson Corporation
1072608-04
Problem Possible Cause Corrective Action
3. Low fluid volume or
excessive pressure
drop
Cavitation Refer to problem 1.
Loss of prime in piston
assemblies
Frequently check the oil level and add oil as necessary.
Worn or broken check
valves
Replace the check valves.
Foreign material in inlet
or outlet check valves
Disassemble and clean the check valves.
Damaged diaphragm
cartridges
Replace the diaphragm cartridges.
Broken piston return
spring
Replace the piston assembly.
O-rings forced out of
their grooves from over-
pressurization
Disassemble the pump and replace the O-rings.
Warped valve plate from
over-pressurization
Replace the pump.
Cracked cylinder casting Replace the pump.
Worn spray nozzles
Replace the nozzles.
Worn back pressure
regulator
Rebuild back pressure regulator.
4. High oil
temperature− above
140 °F (60 °C)
Cavitation Refer to problem 1.
Re-circulating too much
material
Do not operate the system for long periods of time without
spraying coating material.
5. Premature check
valve failure
Cavitation Replace the check valves.
Foreign material in the
inlet or outlet check
valves
Disassemble and clean the check valves.
6. Premature
diaphragm cartridge
failure
Cavitation Replace the diaphragm cartridges.
Broken piston return
spring
Replace the piston assembly.
Puncture by a foreign
object
Replace the diaphragm cartridges.
Excessive pressure
The operating pressure should not exceed 83 bar (1200 psi).
Check the pressure relief valve setting.
Diaphragm material
incompatible with coating
material or solvent
Contact your Nordson representative for compatibility information.
7. Broken piston
return spring
Cavitation Replace the piston return springs.
8. Premature bearing
failure
Cavitation Replace the pump.
Continued...