Graco DutyMax EH 230DI Operation Manual page 46

Repair
6. Install o-rings inside cylinder and on
sleeve. Slide sleeve into bottom of
cylinder. Replace o-ring if necessary.
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7. Apply liberal amounts of grease or oil to
piston packings.
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8. Grease top inch or two of piston rod that
will go through the cylinder throat
packings. Gently guide displacement
rod up through throat packings. Tap
bottom of piston valve as necessary with
a leather or plastic hammer.
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9. Grease o-ring and place on outside
diameter ring groove.
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