Troubleshooting
5-2
Part 104373
−
03
E
2015 Nordson Corporation
Problem
Possible Cause
Corrective Action
1. Pump fails to start
Air supply turned off or inadequate
Make sure there is adequate air
pressure at the pump inlet fitting and
the air shutoff valve is turned on.
Air regulator improperly adjusted,
blocked air filter element, or faulty
air regulator
Check the air pressure. A minimum
of 1.38 bar (20 psi) is required to start
the pump.
Increase the air pressure to that
required for the desired fluid pressure
output. Refer to the
Description
section for air-to-hydraulic pressure
ratios.
If the pump fails to start after
increasing the air pressure, remove
the air filter element and clean it.
If the pump still fails to start,
disconnect the
1
/
2
-in. tubing at the air
valve inlet. If air does not flow out of
the tubing, replace the air regulator.
Hydraulic system blocked
NOTE:
If the circulation valve and
drain valve are closed, the pump
will not start, or will stop operating.
If the
If sufficient air pressure is available to
operate the pump, check the fluid
pressure. If the fluid pressure is
higher than the pressure generated
by the pump at the current air
pressure setting, the pump will not
operate.
Close the drain valve and open the
circulation valve. If the pump fails to
start, check for a faulty circulation
valve. Refer to Problem 7.
Check for a clogged spray device
nozzle, fluid filter screen, siphon
strainer, or fluid hose.
Air valve spool centered, not
allowing air in cylinders to exhaust
Push the manual override button on
the double pilot valve. You should
hear the air valve spool shift and the
pump should start.
Air valve spool binding
If pushing the manual override button
does not shift the air valve spool, the
spool may be jammed. Remove both
end caps and push the spool back
and forth. If it does not move or is
extremely tight, disassemble the
valve and lubricate all parts. Replace
any worn parts. If the spool slides
back and forth easily, reinstall the
end caps.
Continued...
