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Rick:
I had a problem with my '73 337G where the gear wouldn't come up at all. It turned out to be, as Damon has suggested, an electrical POWER problem where the battery was very weak and the alternators could not handle the huge load demanded to charge the battery AND drive the powerpack.
BUT, for your case, I like better Damon's earlier thought that it may be a faulty pressure switch on the hydraulic power pack, allowing the pump to start and unlock the gear, but then failing to complete the cycle any further.
Why? Because it didn't work when you tried the manual handle.
If it was due to insufficient electrical POWER (battery, alternators, too-high resistance), then one or both of your alternators would have switched off, as it did in mine. Also, you said the breaker popped, so that suggests that you had all the electricity which the powerpack could handle.
Ernie
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