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Tech notes

Maintenance and faults

Field-tested maintenance notes.

Oil sample analysis in the lab

Maintenance and faults · October 18, 2026

70% of failures start in the oil: hydraulic oil cleanliness

Particle counts, NAS classes and filter intervals.
A technician checking a pump

Maintenance and faults · October 9, 2026

5 early signs of hydraulic pump failure

Noise, heat, slowdown, foam and pressure ripple.