The no-load voltage of excavator generator should be about 28 ∨ and 33V is obviously a little high.
The cause should be the generator adapter. The detection method is very simple. When the engine is idling, the generator is in no-load measurement, and then the fuel filler valve. When the engine is at high speed, the voltage should drop instead of falling. That is, the adapter is broken. Replace it to solve the problem