Quote:
Originally Posted by Cubcadet_107
Well that's unfortunate, and confusing!
Not entirely sure what would ever cause a set of almost new relief valves to fail so quickly. 
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Yes, concerning. I bought 4 "new" auto relief valves from MachTechDirect.
I tested them again today. I have a working hydro attached to a rear end on a wood cradle. The two relief valves in it were working. I ran the hydro with a drill and verified axles rotated as expected when the trunnion arm is moved.
I replaced one valve with one of the suspected failures (reverse side). Reverse no longer worked. Swapped the two valves. Forward no longer worked. Installed the second suspect valve. Neither direction worked. Replaced original valves, both directions worked.
So both auto relief valves are faulty.
Go figure.