Bobcat mini excavator air in hydraulic fluid / aeration

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Hi, I have a bobcat mini excavator and i recently had to replace the pump coupler because the previous owner replaced the pump and coupler, but didnt replace the pump gear so it slipped back on the pump shaft due wear and stripped out the end of the coupler. i mostly removed the pump to remove the coupler and now after everything is back together, i still get an occasional pump groaning sound and there is clearly air in the system. i used traveler iso 46 fluid and donaldson filters and ive ne...