We have a 2019 RK750 that I have been having problems with slow cranking issues since bought the machine..I've replaced the battery so it's not a voltage issue..I have experience with diagnostic being a diesel mechanic for 30yrs..Voltage drops from 13.30 to under 8.00 under starting load..Have a new starter already ordered but a little unsure if there's anything I'm missing on installing besides just the 2 bolts and starting lead wire..Is this just unbolt and replace or is there anything else like gears inside the case I will have to deal with..Dealers and hisun don't like any info being available so you use the dealer (which are very limited) ..Thanks for any help