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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
D14MZ3000 Troubleshooting - Part 3
Step 12: Install the new upper ange, align the tooth inside the
ange with the notch in the piston shell.
Step 11: Remove by lifting straight up.
Step 10: To replace the upper ange (Part #: PDI643), grasp and
twist it counter clockwise.