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Fluid
Change
Calculator
Calculate hydraulic fluid drain interval and volume estimation for system maintenance
Input Parameters
Reservoir Size (gal)
Total System Volume (gal)
Fluid Age (hours)
Contamination Level
Clean (ISO 16/14/11)
Normal (ISO 18/16/13)
Dirty (ISO 20/18/15)
Severely Contaminated
Calculate
Results
--
Drain Volume
gal
--
Flush Volume
gal
--
Fill Volume
gal
--
Next Change
hours
Reference
Typical change interval: 4000-6000 hours Flush needed for contaminated systems Drain efficiency ~85% (residual in lines/cylinders)