drilling rig,water well drilling rig
7.At the positioning of each hand should always be checked, after each hand position in the shift should be noted that is correct, must not violate the following principles:

Under normal circumstances: Lord, vice winch does not work at the same time, Lord, vice winch clutch handle and pull tight. The main winch reel turntable does not work, the main hoist clutch handle and the brake handle and pull tight. When the rotary table and mud pump at the same time (in addition to tighten the tube and from the drill), so start the main winch brake handle, attention should be returned to the water situation. Is strictly prohibited turntable clutch handle and the main hoist clutch handle and pull tight; vice winch clutch handle and the brake pedal at the same time pull the dead.