よくある質問

Excavator Code 7421 FAQ

What causes excavator code 7421?

Code 7421 typically indicates issues with the coolant system, either from low coolant levels or a malfunctioning water level switch.

How do I check coolant levels for code 7421?

First, ensure the engine is cool. Locate the coolant reservoir and check that the fluid level is between the minimum and maximum marks. Top up if necessary with the correct coolant type.

How can I test the water level switch?

Disconnect the switch connector and use a multimeter to check for continuity. With proper coolant levels, there should be continuity. If not, the switch may need replacement.