SP Pump Diagnostics and Repair
B-6
Part 1128350_02
E 2020 Nordson Corporation
Single Acting Pump Diagnostics
Table B-2 Single Acting Pump Diagnostics
Problem Possible Cause Corrective Action
1. Pump not stroking
Pump not turned on Turn on pump at the user interface.
No 24V DC provided to solenoid valve
Check for customer-provided 24VDC at
solenoid valve.
No air pressure
Check gauge or display for air pressure.
Adjust air pressure at regulator.
Check for air pressure at supply
connection.
Checkregulatorforproperoperation.
Check solenoid valves for proper
operation.
Applicators not firing Check applicators.
2. Pump strokes erratically
with reduced output
Tank is empty Fill the tank.
Isolation valve is closed Open the isolation valve.
Tank drain is clogged Remove the tank strainer if equipped and
clear the drain.
Siphon check valve is loose,
damaged,or dirty
Inspect and repair the siphon valve valve.
Pressure check valve is loose,
damaged or dirty
Inspect and repair the pressure check
valve located in the filter manifold.
3. Pump leaks adhesive
from between the piston
shaft and hydraulic
body
Piston shaft seal is worn or damaged Replace the seal.
4. Pump leaks adhesive
from between the pump
frame and manifold
Damaged or missing O-rings on pump
body
Replace the pump body O-rings.
Pump is not fastened to manifold Fasten the pump to the manifold with the
two screws.
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