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Message: <blockquote data-quote="flyerdan" data-source="post: 116289" data-attributes="member: 2510">I doubt very much that a small amount of water would break the steel in a pump housing - it's not like the thin cast iron water jacketing that can break fairly easily.The relief valve should pop off several times during normal operation if you roll the bucket back; by the time it hits the stops the relief should kick in before you can let up on the pedal. I don't know of a way to test it without a lot of specialized equipment, according to the online parts catalog it could have either a fixed or adjustable relief valve, depending on s/n.Hopefully someone will be along with a fairly easy and inexpensive way to test it.</blockquote>