The ball I think you are talking about is part of the "Non-Serviceable" plug. If you have that leaking you have to pull the pump. If it is the unions on the head or the pump, you should not need to pull the pump.
Here is a guide to help understand the HPOP if you have not seen it. Pretty good info and a few cutaway photos.
7.3L Diesel High Pressure Pump Diagnostics Guide
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Ken
2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....  
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