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Solution to Production Boost Causes Seal Leak:
Gerotor style motors generally do not use an external case drain for pressures lower than 1,500 psi or in non-shock loaded applications. otherwise the shaft seals experience short life. CFC's Jon Rhodes had the maintenance crew connect a case drain line from pump to tank, which solved the problem.
We always use a case drain where ever we can, regardless of the operating pressure. Shaft seal leakage is the major reason why gerotor motors are removed from service. One manufacturer claims that installing a case drain on its motors virtually eliminates shaft seal leaks. Case drains are also great to determine if a motor is worn internally by measuring leakage with the motor running at full load.