Inside the pump, there is a lever that latch's on a machined ledge. Normally , they don't hold good enough so unusual for it to hold too good. Over the outlet of the relief valve is a cap that push's this lever when the relief valve open and allows the oil to come through hole in end of relief valve. Your problem has to be in that area. Bent lever or cap is getting stuck between relief valve and lever,(cocking off to the side). There again, usually when that lever bends the cap pops off and ends up in bottom of pump some place. Lever is mallable so it can be straightened and a little fileing or grind on right spot to make it latch good but readily easy to trip. The headed pin the lever pivots on can also become bent causing your problem.
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