Applies to: ET-PDX-750 ET-PDX-750C ET-PDX-750T ET-PDX-750CT ET-PDX-750-EX ET-PDX-750-EX-T ET-PD-550 ET-PD-750 Arrowhead Power cell common issues: Charge Pressure for PDX-750 26 bar 360psi Charge Pressure for PD-550/750 20 bar 290 psi Charge Pressure ...