Thump... Thump... Thump... A very rhythmic Thump. It's coming from the leveling valve. Replaced it. No difference. Any ideas? It's driving both me and the owner bat poop crazy.

Any ideas? Adjusted wrong? It just started on him out of the blue one day. If I disconnect the arm from the lever, and move the valve lever UP, it stops, but not far from the top limit of travel of the arm.

Google is a dead end, and the repair manual indicates that another valve should have fixed it... but, no.

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