Hydraulic System Fault — Low Oil Level
What This Fault Means
A low oil level fault means the reservoir fluid dropped below the minimum sensor threshold. Running the pump with low oil risks cavitation, aeration, and catastrophic pump failure.
Common Causes
- External leak at a hose fitting, cylinder seal, or valve body
- Internal leak filling a cylinder or accumulator beyond normal volume
- Oil cooler leak (oil mixing with coolant water)
- Reservoir drain valve left open after maintenance
- Normal consumption not replenished on schedule
Recommended Fix
- STOP the pump immediately — cavitation damage is irreversible.
- Visually inspect all hoses, fittings, and cylinders for external leaks.
- Check the oil cooler for oil-in-water contamination (milky coolant).
- Verify the reservoir drain valve is closed.
- Top off with the correct fluid to the proper level, then restart and monitor.
Still stuck? Ask Mira.
Paste your fault code into Mira and get an answer from your actual equipment manuals in seconds.
Try free