© 2024 Nordson Corporation
1044131-06
5-4
Troubleshooting
Problem Possible Cause Corrective
3. Pump strokes
irregularly when
spray device is
triggered
Air in hydraulic system
Purge the air from the
hydraulic system. Refer to
Flushing in Operation and
Maintenance. Add defoaming
agents to coating material.
Coating material temperature too high, causing cavitation
As coating material
temperature is increased,
vacuum created by pump
siphon can cause solvents
to boil and cause cavitation.
Lower heater thermostat
setting.
Worn or clogged ball check valve in hydraulic section
Flush the pump and system
with a compatible cleaning
solution. If the problem
continues, rebuild the ball
check valves.
Worn packings Replace the packings.
4. Pump operates but
pump surges
Air motor or air valve leak Refer to problem 2.
Volume of supply air is inadequate
Check for a restriction in the
Make sure the air lines are
the correct size.
Blockage in hydraulic system Refer to problem 1.
Coating material too viscous
Check the material viscosity.
Add solvent to the material to
lower the viscosity.
Drain valve (circulation kit) leaking
when it is closed.
Output from spray devices exceeds pump capacity
Reduce the spray device
Reduce the number of spray
devices connected to the
pump. Reduce the circulation
rate.
Continued...
To Next Page
Loading...
