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post #3 of Old 06-02-2010
JiffyLube
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I rebuilt our Groco pump once. An O-ring goes around the piston of the pump in the chamber, and if it's hard to pump then I would lube up the chamber the piston is in. This will allow the O-ring to slide much easier. Lube with anything that will not affect the rubber of the O-ring.
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