Applicable Systems
EC220 Excavator
Symptoms
Hydraulic oil temperature above 95C; hydraulic system efficiency reduced; oil degradation risk.
Possible Causes
- Hydraulic oil cooler clogged
- Oil level low causing overheating
- Internal hydraulic leak generating heat
Troubleshooting Steps
- Step 1: Check hydraulic oil level (warm)
Level at FULL mark - Step 2: Inspect hydraulic oil cooler for blockage
Cooler fins clean - Step 3: Check oil condition (dark/burnt = degraded)
Oil clean, normal color - Step 4: Test for internal leaks in main control valve
No excessive internal leak - Step 5: Flush cooler and replace oil if degraded
Oil temp below 85C at full load
How to Reset
Clear via Volvo Tech Tool after hydraulic oil service.
Common Replacement Parts
- Hydraulic Oil Cooler P/N: VOE15890244
- Hydraulic Oil (20L) P/N: VOE15890245
Frequently Asked Questions
- Q: What is normal hydraulic oil temperature?
Normal range 50-85C. Above 90C triggers warning. Above 100C may cause oil degradation and seal damage.
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Source: volvo fault codes reference
Category: Heavy Equipment
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