Which device is not needed for direct-plunger or roped hydraulic lifts?

Which device is not needed for direct-plunger or roped hydraulic lifts?

• A. Lag Screws
• B. Control Box
• C. Stopping Devices
• D. Interlock Wiring

Answer: (C)

The main idea is that these hydraulic drives are controlled by the hydraulic system itself, not by a separate rope-driven mechanism. In a direct-plunger hydraulic lift, the cylinder provides end-of-travel stopping and hold without needing a mechanical stop device along a rope path. A roped hydraulic setup uses a rope, but the movement is still governed by hydraulic control valves and end stops, so an additional stopping device isn’t required to arrest rope motion. The items that are still needed include lag screws to mount the equipment securely, a control box to manage the lift’s operation, and interlock wiring to satisfy safety interlocks with any access points. Therefore, stopping devices aren’t needed for these hydraulic configurations.

The main idea is that these hydraulic drives are controlled by the hydraulic system itself, not by a separate rope-driven mechanism. In a direct-plunger hydraulic lift, the cylinder provides end-of-travel stopping and hold without needing a mechanical stop device along a rope path. A roped hydraulic setup uses a rope, but the movement is still governed by hydraulic control valves and end stops, so an additional stopping device isn’t required to arrest rope motion. The items that are still needed include lag screws to mount the equipment securely, a control box to manage the lift’s operation, and interlock wiring to satisfy safety interlocks with any access points. Therefore, stopping devices aren’t needed for these hydraulic configurations.