SP Pump Diagnostics and Repair
D-5
Part 1024496_06
2014 Nordson Corporation
Table D‐1 Pump Diagnostics
Problem Possible Cause Corrective Action
1. Pump not Stroking
Air valve dirty or damaged
Valve sleeve O‐rings damaged or
deteriorated
Remove the Valve Spool and Sleeve
Remove the Valve Spool and Sleeve
Air leaking from between the cylinder
head and the air cylinder or between
the air cylinder and the pump frame
Remove The Actuator and the Air
Cylinder Assembly
Piston cups damaged Remove the Piston Cups
Shifter fork damaged, slipped out of
position on piston, installed upside
down, or magnets loose
Removing the Shifter Fork
Magnets on actuator assembly loose Remove the Magnetic Actuator Assembly
Piston damaged or has char buildup Remove the Lower Ball Seat Assembly
and the Piston
2. Pump Leaking
Adhesive
O‐ring and/or pump seal deteriorated
or damaged
O‐rings on cross‐over tubes or
between the pump and manifold
damaged or deteriorated
Remove the Pump O‐ring and the Pump
Seal
Removing the Pump from the Melter
3. Pump Strokes
Erratically
Siphon ball, seat and/or cage is
damaged, deteriorated, or has char
buildup
Disassemble the Lower Ball Seat and
Pressure Ball Assemblies
Pressure ball and/or seat has char
buildup or is scratched or pitted
Disassemble the Lower Ball Seat and
Pressure Ball Assemblies
Piston has char buildup Remove the Lower Ball Seat Assembly
and the Piston
Pump body dirty Remove the Lower Ball Seat Assembly
and the Piston
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