Gear Pumps have a drain passage that is designed to remove fluid that has leaked into the seal pocket to drain back to the case drain so that pressure cannot build on the seal causing it to leak.
Pumps that are designed to be bi-directional have drain passages that drain to both the inlet and outlet connections and the passages have check valves installed so that the pressure drains to the low pressure connection and the high pressure from the outlet is blocked from entering the seal pocket.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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