SP Pump Diagnostics and Repair
B-18
Part 1128350_02
E 2020 Nordson Corporation
Replace the Hydraulic Piston Seal (All Pumps)
1. Wrap shop rags or other cushioning material around the lower section of
the pump body to protect it from damage and clamp it securely in a vise.
2. Use a open end wrench to loosen the lock nut holding the pump frame to
thepumpbody.Ifaspannerisnotavailable, you can use a screwdriver
and a hammer to loosen the lock nut.
3. Remove the lock nut.
4. Separate the pump frame from the pump body.
5. Unscrew the pump body retainer from the pump body.
6. Carefully pry the old seal out of the pump body retainer.
7. Clean the pump body retainer.
8. Inspect the O-ring and replace if necessary.
9. Installanewsealbyhandintothepump body retainer. When properly
installed, the open side of the seal with the spring will be visible.
Figure B-4 Seal in the pump body retainer
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