Reduction gear tooth contact can be inspected by applying what to the gears?

Applying red or blue dykem to gears during an inspection of reduction gear tooth contact allows for a clear visual assessment of the gear teeth's contact patterns. Dykem is a layout dye used in machining processes to aid in visualizing contact areas. When the gears mesh while coated with dykem, the dye transfers to the points of contact, indicating how well the gears are engaging. This process reveals any misalignments or incorrect tooth contact, essential for ensuring efficient operation and preventing premature wear. The specific colors, red or blue, enhance visibility and help distinguish between different contact patterns or problems. This method is a standard practice in gear maintenance to ensure proper function and longevity.