During a scheduled preventive maintenance inspection (PM) of a Komatsu D155AX-8 Power Shift Transmission with 4,414 total hours since new, a maintenance technician observed several abnormal conditions. Among them, the technician reported that the machine required the addition of approximately one quart of coolant per week and the power shift transmission oil appeared to have water contamination.

In this case study you'll:

• Learn about a situation in which oil analysis helped a construction company determine the source of water contamination in a dozer transmission. With additional testing, a thorough investigation of the results and the process of elimination, oil analysis identified the culprit.