SP Pump Diagnostics and Repair
B-4
Part 1128350_02
E 2020 Nordson Corporation
Pump Diagnostics
To determine why the pump has failed, you will, in most cases, have to
partially or fully disassemble the pump. To assist you in determining the
appropriate level of disassembly, Tables B-1 and B-2 provide a breakdown of
pump failures, the potential conditions that could produce each failure, and
the disassembly procedure(s) in which potential condition(s) can be
examined.
Disassembly procedures are provided in Pump Disassembly and
Reassembly.
Double Acting Pump Diagnostics
Table B-1 Double Acting Pump Diagnostics
Problem Possible Cause Corrective Action
1. Pump not stroking
Air valve requires lubrication Lubricate air valve.
Air valve is dirty
Remove and inspect the air valve.
Air valve is damaged
Shifter fork is damaged
Remove and inspect the shifter fork.
Shifter f ork is installed upside down
Magnetic actuator assembly is loose or
damaged
Inspect and tighten or repair.
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.
Pressure check valve is loose,
damaged or dirty
Inspect and repair the pressure check
valve.
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.
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