How to Fix Excavator Code 7421 - Troubleshooting Guide
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how to repair excavator code 7421
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Excavator Code 7421 FAQ
What does excavator code 7421 indicate?
Code 7421 typically indicates either low coolant level or a problem with the water level switch in your excavator's cooling system.
How do I check for low coolant level?
First, let the engine cool completely. Then check the coolant reservoir - the level should be between the MIN and MAX marks. If low, refill with the manufacturer-recommended coolant mixture.
What should I do if the water level switch is faulty?
Inspect the switch for damage or corrosion. Test its continuity with a multimeter. If faulty, replace the water level switch following your excavator's service manual procedures.