Benjamin Benjamin Marauder issues charging

Has anyone had issues charging the Benjamin Marauder bolt action air rifle? It’s like something is jammed and it won’t receive air. Anyone input is appreciated. Thanks in advance.
The fill check valve oring probably is falling apart and needs to be replaced. USE NO Oil. It's going to fall apart and no oil on pressure sides. It's as simple as unscrewing the foster fill and cleaning up the remnants and switching an oring.
 
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If the foster fitting will not take air it is possibly corroded or otherwise in need of service. It can be removed and dissassembled for cleaning and service. If the foster fitting is taking air but it is leaking out of the exhaust valve and the air reservoir will not charge, cock the rifle. This will pull the (overly tightened) hammer back off the knock off valve stem and allow the rifle to charge.
 
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