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The answer to the question: "does hyd pressure remain on the gear after it is up, when the doors start to close," is no! Look at the service manual for 65-73' figure 5-48. It shows "static pressure" in the main gear actuator when the doors are closing under pump pressure...static pressure means whatever was in the line when the priority valve switched over so the doors could close at a lower hyd pressure. So, the engine driven pump isn't holding the gear in the up position after they are locked up. But in theory, trapped hyd fluid (static pressure) does resist the gear from falling down.
By the way, how much did a "new" hyd pack cost?
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