In a quality hydraulic pump there is a passage drilled from the driveshaft end back to the suction port of the pump. a small quantity of oil moves along the shaft, to lubricate it, and is pulled back through that port,(drilled hole) to the suction side, or inlet of the pump. Whrn the pump is getting worn out, and there is slop in the shaft and gears, oil moves along them, to the above mentioned port faster than it can be returned, or pulled back by suction, often, high pressure escapes through that drilled port, and pushes out the shaft seal. The problem that you have described is a sign of a worn out pump..when you"re done throwing your money into parts...and finding that it still leaks, and is popping the shaft seal..bite the bullet...and purchase a whole NEW replacement pump I am a retired locomotive mechanic...but also moonlighted for the buggest hydraulic distributor in the midwest..and taught hydraulics at a tech college, night school, for 12 yraes.
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