The Kola Superdeep Borehole SG-3 (: Кольская сверхглубокая скважина СГ-3, : Kol'skaya sverkhglubokaya skvazhina SG-3) is the on Earth (since 1979), which attained maximum of 12,262 metres (40,230 ft; 7.619 mi) in 1989. It is the result of a effort to penetrate as deeply as possible into the c.
[pdf] Try to turn the compressor by hand. It should be possible to turn it around. It should turn around smoothly, without any 'hickups' (be sure to completely shut down the air compressor!). Check the isolation of the motor windings.
[pdf] The first step is to ensure that the hydraulic system is shut down and the pressure is relieved. Then, the cylinder should be disconnected from the hydraulic system and the cylinder head should be removed. Once the cylinder head has been removed, the piston rod can be manually retracted by hand.
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