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Message: <blockquote data-quote="wford" data-source="post: 52419" data-attributes="member: 6365"><p>Hogman, the short answer was the belt on the left pump. I found it by plumbing in a test set on the left side and running the pressure up until the left side lost pressure. What happened is that when the pressure reached 1800 psi the belt would slip -- no smoke or no squealing -- just slip; and it would stop slipping and pull once the pressure fell below 1800 psi. The right side would always function normally. Although the belt tension always seemed to be within spec, it appears that the clutch assembly was not equalizing, so I disassembled that whole clutch mechanism, cleaned it, re-assembled, and adjusted the belt tension to be very tight. No problems have re-appeared. I never would have detected that problem without the test set in place and leaning over the back of the unit to watch the drive assembly while under full power. I wasted a lot of time on this one ... Grrr.</p></blockquote><p></p>