Didn't rebuild any of mine in my '94 with Power gear...had it for 12 years up until '16. Because the large seal leak I inherited when I bought it was stopped fairly quickly with the addition of ATF Stop Leak. I used to get 1/2 cup into the landing pad every time, but after the stop leak it slowed to a trickle. And then I could go for a year without adding any fluid. Mine was also a hydraulic down, springs up type. It was a tripod style so I had one with the big leak along the shaft and nary a drip from the other two.
Now, as far as rebuilding goes, I've read several times over the years that people remove them and take them into hydraulic shops and have them rebuilt for as low as $50 each. Seems as though Power Gear used standard off the shelf seals and what not.
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