The Problem with OEM Manuals

Original Equipment Manufacturers (OEMs) have a vested interest in selling spare parts and protecting themselves from liability. As a result, OEM maintenance schedules are often hyper-aggressive. If you follow the manual blindly, you will over-maintain your equipment, driving up labor costs and introducing "maintenance-induced failures" (breaking things while trying to inspect them).

Time-Based vs. Usage-Based PMs

Strategy	Trigger	Best For
Time-Based	Calendar (e.g., Every 30 days)	Fluids that degrade chronologically (e.g., coolant bacteria), safety checks.
Usage-Based	Meter (e.g., 500 Spindle Hours)	Mechanical wear items (bearings, belts, filters).

Steps to Optimization

1. Log Everything: You cannot optimize a PM schedule without data. Every breakdown must be logged with a root cause.
2. Identify the Failure Mode: Is the failure age-related? (e.g., a belt wearing out). If it's random (e.g., an electronic board failing), preventative maintenance won't help; you need condition monitoring.
3. Adjust Frequencies: If you perform a quarterly PM on a gearbox and find the oil is still pristine three times in a row, extend the PM to semi-annually.