If you Google the model number with the word problem after it you will see it is very common for this and the 60V500 made the same year.
There are currently several class action lawsuits concerning this and the engine wholesales for about 600 exchange currently. I replaced nearly 20 of them in sets when they were less than 3 years old--extended warranty.
At one point the cost was 1100 and then when so many started failing they dropped it to 225 exchange/wholesale---but that ended a few years ago.
Hitachi (several clients here and locally have told me this) if called will at first deny knowing anything about this problem--but they know and have known for years.
Best suggestion if you are not under a extended warranty---get involved in one of the class action lawsuits----sooner or later Hitachi will have to either replace set for free or pay.
Sorry to give you bad news but if it told you something you did not know, rate this solution as very helpful as I do this here for free.
SD TECH
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