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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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