[wslade2]

You can ground test each pump by observing system performance rear engine only and then front engine only running.

Also as I recall, manual recommends 3 cycles of gear after service on jackstands to be sure air is out.

I also rebuilt front actuator and had to top off multiple times.

You can also run the pumps while on jackstands using a drill. Splined socket from harbor freight fits the pump shaft.

While looking at that front wheel well area there other actuator in there that can leak, the uplock actuator and main gear actuator. If one is leaking, the others may be in same shape too.

To prime the pumps, I filled them manually while turning the prop. I put a hose on the power pack exterior vent and blew on it while cracking the suction line at each pump. Don’t run the pumps dry and unprimed. It’ll ruin the seals and you’ll have to start all over again. (Ask me how I know.)