1 - Overloaded hydraulic pump. Look for the wrong relief valve installed (pressure set too high) or the relief valve missing and replaced with a plug. (A dead-headed hyd pump will lock up solid without a relief valve.)
2 - Wrong cam gear installed. I'm not familiar with the 340 - but a live pump installed on an H or M without also swapping in a heavier cam gear can destroy the stock gear. Could your situation be similar?
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