Analysis of Scissorlift Unit Maintenance Strategy With Failure Mode and Effect Analysis (FMEA) Method and Reliability Centered Maintenance Method at PT. XYZ

XYZ rents out heavy equipment, particularly scissor lifts, so unit readiness and reliability determine service quality. Maintenance is still dominated by corrective actions, which leads to repetitive failures and unit downtime. This study maps the critical failure potential of scissor lift units and develops a risk-based maintenance strategy by combining Failure Mode and Effect Analysis (FMEA) with Reliability Centered Maintenance (RCM). FMEA was used to identify 20 failure modes across four subsystems (hydraulic, electrical, mechanical and structural, and drive) and to calculate the Risk Priority Number (RPN) from Severity, Occurrence and Detection scores obtained through discussion with mechanics. The FMEA results were then processed with RCM decision logic to determine failure consequence categories and suitable maintenance tasks. The highest RPN was found in the hydraulic cylinder seal (315), followed by the pivot pin (280), the hydraulic pump and control valve (240 each), and the bearing/bushing (210). The hydraulic subsystem accounts for 36.3% of the total RPN. The RCM analysis places 6 components under safety consequences, 2 under hidden protective functions (limit switch and emergency stop), and 12 under operational consequences. The proposed strategy combines on-condition inspection, scheduled restoration and discard, and function tests of safety components before units are rented out. A framework for calculating maintenance intervals and reliability from time-to-failure (TTF) and time-to-repair (TTR) data is also provided for use once failure history is fully documented.