SP Pump Diagnostics and Repair
D-1
Part 1024496_06
2014 Nordson Corporation
Appendix D
SP Pump Diagnostics and Repair
WARNING! Allow only personnel with appropriate training and experience to
operate or service the equipment. The use of untrained or inexperienced
personnel to operate or service the equipment can result in injury, including
death, to themselves and others, and damage to the equipment.
Introduction
This appendix provides comprehensive diagnostic and repair information for
the SP pump used in all ProBlue adhesive melters. Before using the
information provided in this appendix to diagnose or repair your pump,
ensure that you have eliminated all conditions that might otherwise be
mistaken for a failure of the pump. Refer to Section 6, Troubleshooting.
NOTE: The procedures and illustrations in this section are specific to 15:1
pumps, but can be used for 6:1 pumps as well. Refer to the pump‐specific
parts lists in Section 7, Parts, when performing the procedures in this section.
Pump Function
The pump is double‐acting—material is discharged from the pump during
both the upward and downward stroke of the piston.
The pump consists of an air section and a hydraulic section. Air is supplied to
the pump through an air filter and a regulator. From the regulator, air flows to
an air valve inside the air section. The air valve directs air into either the
upper or lower portion of the air cylinder, which forces the piston assembly up
or down. The lower end of the piston assembly contains a pressure ball
valve. At the bottom of the hydraulic section is a siphon ball valve.
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