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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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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