Key Takeaways:
A hydrostatic spindle rewards discipline, not heavy service. The routine is simple: keep oil NAS 5 clean, change it around 2000 h or six months, service the filter ~500 h, and monitor pressure, flow, and film.
A Light but Regular Routine
Hydrostatic spindles have no wearing contact parts, so they avoid the rebuilds rolling bearings need. Their upkeep is about protecting the oil film, not replacing hardware.

The Schedule
- Oil cleanliness: maintain NAS 5 or better at all times.
- Oil change: approximately every 2000 operating hours or six months.
- Filter service: approximately every 500 operating hours.
- Daily/pre-run: confirm supply pressure, flow, and film thickness are nominal.
- Temperature: keep oil near 35±5°C (ambient 20±1°C ideal).
Why Discipline Pays
Because accuracy lives in the film, a consistent schedule keeps runout at or below 0.1 μm and stiffness above 500 N/μm for the spindle's whole working life—turning 'infinite life' from theory into practice.