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How could that happen? The seal as well as the retainer are installed on the tandem axle spindle, not pressed into the spring seat housing. There is no way these could shift further back..... I blew out that seal when I first did the conversion. Without the "relief" the seal blew out like a cork in a bottle of seltzer when I was pumping in the grease.
Because otherwise the front (outer) bearing would never see any fresh grease.Why in the world would the military say to install the zerk in the bottom of the trunnion and then "LOOSEN" the cap before pumping in grease ?
You are referring to the #7521647 "Retainer, Packing"; not the seal itself. Very likely there was a change of materials for that particular part,over all those years..... I forgot to add my seal was a hard "plastic" type seal. Not some felt seal.
BTW: When I upgraded my spring seats I also replaced that old felt and washers with a 4mm thick (PP)plastic disc, plus an O-ring acting as spacer.
All it does is keep the backside opening shielded to the outside, to prevent dirt and small rocks to enter the next cavity where the seal is. And there is always a slight gap left in between that shield and the seat housing; more than enough for the grease to squeeze out.
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