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How ca I fix my jcb js200sh excavator ?

I have a JCB Excavator js200sh full electric control,
I have a problem that., when I start it it gain 1800 rpm after few seconds (5 to 10s) it dropped ti 1420 rpm due to low power indecent on the screen and don't go to its original rpm 1800.
Ali Akbar, February 2017
This is a windup mind you he could be living in the bucket under a tarpaulin.

Charley Farley, March 2017
link Click here to see other fixes for JCB.