My 580CK has the Cessna hydraulic pump which I have done the complete gasket, seal and spring/retaining ball rebuild twice but it keeps blowing out the main drive seal every time it takes on any amount of load. Tolerances are within specs in the manual. Any ideas would be greatly appreciated or if anyone knows of an aftermarket replacement pump it all would help. Thanks.
1968 580CK - Hydraulic pump blows main drive seal
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