You are absolutely right. One of two hydraulic pumps could be selected, and, when the oil in the collecting tank got high enough, the pressure in the tank caused an automatic switch to close, which kicked on the pump to pump oil back up into the accumulators. Generally though, the pressure wasn’t allowed to drop to the minimum 48 kg/cm², but was normally pumped up by hand by switching the pump on at 60 to pump it back up to 80.so that the commander always had good hydraulic pressure to operate the scope efficiently. I would be all for implementing some form of the hydraulic system.
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