08-21-2017 09:03 AM
Sounds like you may have about 3% speed droop.
What is the complete engine serial number?
How much load was applied to result in the observed speed drop?
More information will get you better answers.
05-03-2017 08:16 AM
I have CAT3412 - 1EZ Series , ECM
No load speed is 1520 RPM , When i load the engine , The speed decreased to 1440 and compensate to 1470 , Why it can't reach 1520 again ?