The 60187791 screen and touch key assembly consists of three coordinated components that work together as a complete operator interface system. Here is what each part does and where it fits:

1. Inner Screen
The inner screen is the active display unit mounted behind the outer protective layer. It shows critical machine data including system status, error codes, pressure readings, and operational parameters. This component is installed inside the control panel housing, secured to the main circuit board through a ribbon cable connector. The screen uses standard LCD or TFT technology suitable for daylight readability.

2. Outer Screen
The outer screen sits on top of the inner display as a physical protective cover. It shields the inner screen from dust, moisture, and accidental impacts common on construction sites. Made from scratch-resistant transparent material, it mounts directly over the inner screen using adhesive or mechanical clips. This layer does not affect touch sensitivity while providing necessary durability.

3. Touch Key
The touch key is a membrane switch panel positioned adjacent to or overlaid on the display area. It provides tactile push-button inputs for menu navigation, function selection, and parameter adjustments. These keys connect to the control unit through a flexible printed circuit and register operator commands.

Installation Location
This entire assembly mounts into the dashboard or armrest console of the machine, positioned within easy reach of the operator. Installation involves securing the outer frame, connecting the wiring harness, and verifying display function. Replacement requires removing the old unit and transferring any bezel or gasket components.

This assembly is found on various SANY equipment models including truck cranes, excavators, and loaders where operator interface reliability is essential.