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D25RE2 Troubleshooting - Part 3
Step 8: Also, check the piston shell’s t inside the body. To do this,
invert the piston and slide it into the body. It should be a snug t.
If it feels loose, the piston shell (Part #: P421) and the push rod
o-ring (Part #: J020) need to be replaced.
Step 9: To replace the piston shell, use a small tip Phillips
screwdriver and remove the valve support screws and plastic
retainer.
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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 7: You can visually inspect the upper and lower anges
on the piston shell. If they are worn or have deep scratches, the
piston shell needs to be replaced.
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