© 2024 Nordson Corporation
1044131-06
5-6
Troubleshooting
Problem Possible Cause Corrective
7. Pump does not
stroke when
circulation valve is
opened
Clogged circulation valve, or blockage in system
Open the circulation valve
fully, then close it partially. If
the system with a compatible
cleaning solution. Refer to
problem 1.
No compressed air supply, or air pressure is too low
Check the air supply at the
drop-leg drain valve. Make
sure the regulator is working
correctly.
8. Solvent chamber
Upper packings worn
Replace the packings. Upper
and lower packings should
be replaced at the same
time.
9. Spray pattern fades
or narrows
Compressed air pressure is too low
Make sure the air pressure
regulator is working correctly.
The pump air motor requires
at least 1.38 bar
(20 psi) air pressure to
operate. Increase the air
pressure. Check for a
restriction in the air supply
line.
Blockage in hydraulic system Refer to problem 1.
connected to system
size, or the number of spray
devices connected to the
pump.
Spray device nozzle plugging
and inspect it. If the screen
is damaged, replace it. If
the screen is undamaged,
replace it with one with a
smaller mesh size.
Clean the spray device
nozzle.
Circulation valve opened too far
Close the circulation valve
completely, then reopen until
pump is stroking 5 to 10
strokes per minute with guns
10. Spray pattern has
tails of unatomized
coating material at
the outer edges
Low hydraulic pressure or partial blockage in system
Increase the air pressure.
Flush the system with a
compatible cleaning solution.
Refer to problem 1.
Material too viscous
Add solvent or heat to the
coating material to lower the
viscosity.
tip.
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